3Com OfficeConnect 3C886A Instruction Manual

Part No. 1-024-2302
Published November 1999
O
FFICE
C
ONNECT
56K LAN M
ODEM
R
ELEASE
N
OTE
V. 7.2.0
Introduction This release note describes the following enhancements made to the
OfficeConnect 56K LAN Modem as part of this latest firmware release.
■ Enhanced Dial-in Support
■
Service Provider Callback Feature
■
Upgrade Check Feature
■ Local DNS Table
■
LAN Modem Desktop Manager (Windows 95/98/NT)
■
Virtual Fax Modem (Windows 95/98 and NT 4.0)
■ Miscellaneous Enhancements
Enhanced Dial-in
Support
Previously, the LAN Modem provided limited dial-in capability, such as for
accessing a remotely located LAN Modem for remote configuration or to check
statistics. Now, Dial-in support has been enhanced to extend access to
workstations or servers located behind a remote LAN Modem.
Dial-in Applications The following dial-in scenarios are supported by the LAN Modem.
■ Single User Dial-in
■
LAN Modem Site-to-Site Dial-in
■
Advanced Dial-in
For more detailed descriptions of these scenarios, refer to “Understanding the
Three Dial-in Scenarios” later in this release note.
Dial-In
Wizard
Profile Name Network Scenario
Single User Single analog modem calls into a LAN Modem.
Public telephone
network
ALERT
LANSTATUS
POWERB1B2TX1234
COLL
ISDN
OK
ISDNLANModem
3C892
Small office LAN
OfficeConnect
56K LAN Modem
Telephone line
Analog modem
Telecommuter
PWR TEST D B1 B2 SD RD DTR
3Com
Impact IQ
¤
3Com

2 O
FFICE
C
ONNECT
56K LAN M
ODEM
R
ELEASE
N
OTE
V. 7.2.0
Single User Single user on a router (such as a LAN Modem) calls into a LAN Modem.
LAN Modem
Site to Site LAN Modem to LAN Modem
Advanced Router other than a LAN Modem calls into a LAN Modem
Dial-In
Wizard
Profile Name Network Scenario
Public telephone
network
ALERT
LANSTATUS
POWERB1B2TX1234
COLL
ISDN
OK
ISDNLANModem
3C892
Small office LAN
OfficeConnect
56K LAN Modem
Telephone line
Router running NAT
Home office with multiple users
Public telephone
network
Small office LAN Small office LAN
OfficeConnect
56K LAN Modem
Telephone line
OfficeConnect
56K LAN Modem
Public telephone
network
Telephone line
Small office LAN
OfficeConnect
56K LAN Modem
Office LAN
Router (other than
LAN Modem)

Moreconnected
3Com
StatusReset
TX
D
D
12
1
2
4
31/23/434
RX
TX
LK
RX
LAN
RemoteAccessSystem1500
WAN
CO
Power
BRIISDNU
ANALOG
SLOT1SLOT2
STACKNET
CONSOLE
SUPER
STACK
3Com
Status
Reset
TX
D
D
12
1
2
4
31/2 3/4 34
RX
TX
LK
RX
LAN
RemoteAccess System 1500
WAN
CO
Power
BRIISDNU
SLOT1 SLOT2
STACKNET
CONSOLE
SUPER
STACK
3Com

Configuring Dial-In 3
Configuring Dial-In There are three main steps for configuring dial-in support.
1 Change remote administration password
2 Create dial-in user profile on server or central LAN Modem
3 Create service provider profile on client or remote site
Before you Begin Before you begin configuration, please note the following:
■ Any remotely-located device you wish to access on the remote LAN Modem
must be running appropriate software, such as a Web or FTP server.
Examples of server software are Apple’s Personal Web Sharing for the
Macintosh or Microsoft’s Peer Web Services for Windows 95/98. Check with
your computer’s accompanying documentation for more information
.
■
A LAN Modem can only accept dial-in calls from a device that matches its own
call type.
For instance, a 56K LAN Modem will only accept dial-in calls from another 56K
LAN Modem, or another analog modem or router. Calls from an ISDN LAN
Modem or other ISDN terminal adapters are not permitted for dial-in access.
Changing the Remote
Administration
Password
Previously, when dialing into a LAN Modem to configure it remotely or check
statistics, you were prompted to enter the password associated with the LAN
Modem’s configuration parameters. Additional security has now been added
which requires a unique user name and password for remote access. This is
referred to as the Remote Admin account and is reserved for remote configuration
only. This account does not provide dial-in access to LAN or WAN resources other
than the LAN Modem configuration parameters themselves. By default the user
name is
Admin and the password is 1234 . Note that the username and password
is case sensitive.
To change the default username and password (recommended), do the following.
1 Click the Dial-in button located on the LAN Modem’s mainpage.
The Dial-in Configuration submenu opens.
2 Click the Dial-in Users button.
The Dial-in User Selection screen opens.
3 Select Admin and then click Next .
4 In the Username field, delete the default name and then enter a new name.
5 In the Password field, delete the default password and then enter a new
password.

4 O
FFICE
C
ONNECT
56K LAN M
ODEM
R
ELEASE
N
OTE
V. 7.2.0
Configuring the
Server LAN Modem
Configuring the server LAN Modem for Dial-in access requires two main steps:
■
Configure global dial-in parameters
■ Create a dial-in user profile for each dial-in connection account
Configuring global
dial-in parameters
Dial-in Global parameters, described below, allow you to designate a Callback
prefix, set the site number for LAN-to-LAN dial-in, and set authentication
preferences to be used for all dial-in users.
1 From the LAN Modem’s main configuration page, click Dial-In .
Figure 1 LAN Modem Main Configuration Page

Configuring the Server LAN Modem 5
2 Click Dial-in Global .
Figure 2 Dial-In Global Parameters Screen
1 If you are planning to use the Callback feature, use the Callback Prefix field to
enter the number required to get an outside line, such as a 9. Otherwise, leave this
field blank.
2 In the LAN to LAN Site Number, designate the LAN Modem site for dial-in access
from other LAN Modems which will employ the LAN Modem Site-to-Site scenario.
Note that setting the site number may change the IP address of the LAN Modem,
as described below.
■
Choose None (the default) to leave the LAN Modem’s IP address unchanged.
You might choose
None if you will never employ the LAN Modem Site-to-Site
scenario with this LAN Modem (that is, all your dial-in users will employ the
Single-User Dial-in scenario, and do not require LAN-to-LAN connectivity), or
an advanced user might choose
None if the IP address of the LAN Modem has
been manually configured for static IP addressing.
■
Choose Site A to designate this LAN Modem’s IP address as 192.168.1.1 (the
LAN Modem default IP address).
■
Choose Site B if this LAN Modem will place or receive calls to another LAN
Modem which has been configured as Site A. Choosing
Site B will change this
LAN Modem’s default IP address to 192.168.2.1
For example, if you have already designated a remote LAN Modem as
Site A, and you are now setting up a second LAN Modem for LAN-to-LAN
connectivity, you would designate this second LAN Modem as Site B. This
will differentiate between the two LAN Modem IP addresses, which by
default are the same.

6 O
FFICE
C
ONNECT
56K LAN M
ODEM
R
ELEASE
N
OTE
V. 7.2.0
■
Choose Site C if this LAN Modem will place or receive calls to another LAN
Modem previously configured as Site A or Site B. Choosing
Site C will change
this LAN Modem’s default IP address to 192.168.3.1
3 In the Auto Answer field, choose the number of rings to wait before the LAN
Modem automatically answers dial-in calls. By default Auto Answer is set to
Disable, which routes all incoming calls directly to any analog equipment attached
to the LAN Modem phone port. Note that Auto Answer must be set to
1 or
greater if you wish to allow dial-in access to the LAN Modem.
4 In the PPP Authentication field, choose the type of PPP authentication you want
the LAN Modem to use when negotiating dial-in access. Note that at least one
must authentication type must be enabled. By default, PAP, CHAP and MS-CHAP
are enabled. This means that if the client side can do any of the three,
authentication will be successful.
5 Click Submit to save changes.
If you chose Site B or Site C as the LAN to LAN Site Number, the LAN Modem will
re-initialize as its IP address is reset. The front panel LEDs flash, indicating a reset in
progress.
Once the LAN Modem’s IP address has been changed, you can no longer access
the LAN Modem until your workstation has been restarted and has acquired an IP
address belonging to the new LAN Modem subnet.
Create a Dial-In User
Profile Using the Dial-In
Wizard
Before dialing into a LAN Modem, a dial-in user account profile must be created
for every user or site that requires access. To create a dial-in user profile on the
central or server site using the Dial-In Wizard, refer to the appropriate application
below for specific Dial-In Wizard instructions. For more detailed descriptions of
these scenarios, refer to “Understanding the Three Dial-in Scenarios” later in this
release note.
■Single User dial-in (analog modem or an analog router, such as a LAN Modem,
running NAT)
■LAN Modem Site-to-Site dial-in (LAN-to-LAN bidirectional connectivity)
■Advanced dial-in (unknown router dialing into a LAN Modem)
Single User Dial-In Wizard Instructions
1From the LAN Modem main configuration page, click Dial-in.
2Click Dial-in Wizard.
The Dial-in Wizard screen opens, as shown in Figure 3.

Configuring the Server LAN Modem 7
Figure 3 Dial-In Wizard Profile Type Selection Page

8OFFICECONNECT 56K LAN MODEM RELEASE NOTE V. 7.2.0
3Select Single User and click Next.
The Username and Password page appears, as shown in Figure 4.
Figure 4 Dial-In WIzard Username and Password Screen
4Enter a unique name and password to identify and verify this dial-in user when
dialing into this LAN Modem. Note that this will match the username and
password configured on the client device which dials in to this LAN Modem.
5Click Next.
The Congratulations page opens, indicating the successful creation of a dial-in
user.
6Click Continue.
This completes the dial-in configuration for single user. To continue setting up your
LAN Modem for dial-in access, go on to “Configuring the Client Site”.
LAN Modem Site-to-Site Dial-In Wizard Instructions
1From the LAN Modem main configuration page, click Dial-in.
2Click Dial-in Wizard.
3Select LAN Modem Site-to-Site and then click Next.
The Username and Password page appears.
4Enter a unique name and password to identify and verify this dial-in user when
dialing into this LAN Modem. This will match the username and password which
will be entered in the client LAN Modem’s service provider profile.
5Click Next.

Configuring the Client Site 9
6Specify the site name you would like to designate for this dial-in user’s remote LAN
Modem, A, B or C. Note that this site name must be different from the site name
designated in this LAN Modem’s Dial-In Global Parameters, in order to distinguish
between the two networks. The site name specified here will match the site name
configured in the client LAN Modem’s Dial-in Global Parameters.
7Click Next.
The Congratulations page opens, indicating the successful creation of a dial-in
user.
8Click Continue.
This completes the dial-in configuration for LAN Modem Site-to-Site dial-in. To
continue setting up your LAN Modem for dial-in access, go on to “Configuring the
Client Site”.
Advanced Dial-In Wizard Instructions
1From the LAN Modem main configuration page, click Dial-in.
2Click Dial-in Wizard.
3Select Advanced and then click Next.
The Username and Password page appears.
4Enter a unique name and password to identify and verify this dial-in user when
dialing into this LAN Modem.
5Click Next.
The dial-in user parameters page appears, allowing you to manually configure the
Advanced dial-in user parameters. For further configuration instructions refer to
“Dial-in Users Parameters Screen”.
Configuring the Client
Site To configure a dial-in user profile on the client site refer to the appropriate section:
■Configuring the client site for a single modem
■Configuring the client site for a LAN Modem
Configuring the Client
Site for a Single Modem
If the client dialing into the LAN Modem will be a single modem, use the
appropriate software such as Dial-Up Networking for Windows to create a
connection to the LAN Modem. The basic steps for creating a Dial-Up Networking
connection are as follows.
■Create a Dial-Up Network entry
■Enter the telephone number of the remote LAN Modem
■Enter the username and password

10 OFFICECONNECT 56K LAN MODEM RELEASE NOTE V. 7.2.0
Configuring the Client
Site for a LAN Modem
If the client dialing into the LAN Modem is another LAN Modem, you must
configure a new service provider profile on the client LAN Modem which will dial
into the remote LAN Modem. You then use this service provider to place
automatic or manual calls to the server LAN Modem as needed.
When using a client LAN Modem to dial into another LAN Modem via the
Single-User dial-in scenario, you must manually change the IP address of the client
LAN Modem in order to distinguish between the two networks. Refer to
“Changing the IP address on the LAN Modem” for instructions.
Configure a Service
Provider for this Dial-In
Connection
Configure a service provider for this connection as follows.
Before You Begin
You will need the following information.
■Telephone number of the server LAN Modem
■User ID and password of the Dial-in user
■IP address/subnet mask of the server LAN Modem
Additionally, if you would like to use the Callback feature, you will need the
following information:
■Callback telephone number
■Callback username and password
Setting Up a Connection
to a Server LAN Modem
To set up a connection on a client LAN Modem to dial into a server LAN Modem,
do the following.
1From the client LAN Modem’s main page, click the Service Providers icon.
The Service Provider Selection screen opens.
2Choose New (Private Network) from the drop-down menu and click Select.
The Private Network Parameters screen opens.
If you already have four Service Providers configured on your LAN Modem, one
must be deleted before a new Private Network can be created.
3In the Name field, enter a name for this service provider, such as the location of
the server LAN Modem.
4In the Dial Out Prefix field, enter the number required by your location to reach an
outside line, if necessary.
5In the Call Waiting Disable Command field, enter the appropriate command to
disable call waiting.
6In the Telephone Number field, enter the telephone number of the server LAN
Modem.
7In the Alternate Number field, enter an alternative number, if applicable.
8Under Security, enter the User ID and Password for this Dial-in User to access the
server LAN Modem.
9Leave the DNS Addresses fields blank, as these values are assigned by the server
LAN Modem upon connection.

Configuring the Client Site 11
10 Under Private Network Parameters, specify your private network parameters.
■Private Network IP Address: Enter the IP address of the server LAN Modem.
For example, if the server LAN Modem has been designated as Site A, or is
set to its default IP address, enter 192.168.1.1.
■Private Network Subnet Mask: Enter the subnet mask of the LAN Modem
you are dialing into. If you are not sure, leave the default (255.255.255.0).
■Domain Name: Enter the domain name of the server LAN Modem, if
applicable. This field may be left blank if you have entered a Private
Network IP Address. If you want to access client LAN resources via domain
name (that is, “my_net.com”) enter an appropriate domain name.
11 Specify Callback parameters if you want to use this feature. Otherwise, leave the
defaults.
■Enable Callback: Choose to enable or disable Callback. By default Callback
is disabled.
■Callback Delay: Callback Delay is the amount of time the server will wait
before calling back the client. By default this field is set to 5 seconds.
■Callback Timeout: Callback Timeout is the amount of time that the client
waits for the server to call back. Note that this value is in addition to the Call
Back Delay value. By default this field is set to 90 seconds.
■Callback Number: Enter the number that the remote site will call back when
the LAN Modem connects to the remote server. This allows for the reversing
of toll charges for the dial-in call. Note that if a different number is
configured on the server, the server callback number takes precedence.
■Callback Username and Password: Enter the username and password of the
callback user. These values are used to verify the server’s authenticity to the
client. These fields should match the login and password fields on the server
LAN Modem’s dial-in user parameters. Note that callback authentication is
optional.
12 Under Miscellaneous, Do you want to use this Private Network to access the
Internet: Set this field to No. Since this service provider will be used to dial into
another 56K LAN Modem, a second phone line is not available on the remote LAN
Modem in which to launch a call to an Internet Service Provider.
13 Under Miscellaneous, indicate whether or not you would like to use data
compression when transferring data by selecting the appropriate radio button.
14 Under Miscellaneous, leave the default, NAT enabled, if the dial-in user will be
accessing the remote LAN Modem via the Single-User scenario. For LAN Modem
Site-to-Site dial-in, set this field to None, as the Site-to-Site scenario does not use
NAT.
15 Under WAN Link IP address, leave these fields blank. The LAN Modem will
automatically assign these values upon connection.
16 Under Subnet Mask, leave these fields blank. The LAN Modem will automatically
assign these values upon connection.
17 For Allow Automatic Call Initiation, leave the default setting which is Yes. This will
allow you to automatically place a call by entering the IP address of a device on the
remote LAN.

12 OFFICECONNECT 56K LAN MODEM RELEASE NOTE V. 7.2.0
18 In the Default Workstation for Incoming Packets field, specify the workstation to
which all unsolicited TCP/UDP packets should be delivered. Choose None to have
unsolicited packets simply dropped.
19 In the Enable Intelligent NAT field, leave the default set to Yes.
20 Click Submit.
If you would like to configure a connection to another server LAN Modem, repeat
steps 1 through 20.
Changing the IP address
on the LAN Modem
If you will be accessing a LAN Modem server from a LAN Modem client via the
Single-User dial-in scenario, you must manually change the IP address of the client
LAN Modem in order to distinguish between the two networks. This is required
because by default the subnet addresses for both LAN Modems are the same
(192.168.1.x).
Note that this change occurs automatically when creating a LAN Modem
Site-to-Site profile via the Dial-in Wizard, but will not automatically occur when
creating a Single-User profile.
To change the IP address of the client LAN Modem which will dial into the server
LAN Modem, do the following.
1Access the LAN Parameters page on the LAN Modem which will be placing the
outgoing call by clicking the LAN Modem icon on the main page.
The LAN (Ethernet) Parameters page opens.
2Change the IP address field to 192.168.2.1.
3Click Submit.
The LAN Modem re-initializes itself. The front panel LEDs flash, indicating a rest in
progress.
Once the LAN Modem IP address has been changed, you can no longer access the
LAN Modem until your workstation has been restarted and has acquired an IP
address belonging to the new LAN Modem subnet.
4Restart your workstation.
The default IP address for the local LAN Modem will have been changed to
192.168.2.1. Similarly, all attached workstations, once restarted, will utilize an IP
address belonging to this new subnet (192.168.2.x).

Understanding the Three Dial-in Scenarios 13
Understanding the
Three Dial-in
Scenarios
Before you can use the Dial-in Wizard to set up the LAN Modem for dial-in access,
it may help to understand the three dial-in scenarios available for each of your ten
authorized dial-in users. The scenarios are as follows.
■Single User Dial-in (single modem or another 56K LAN Modem running NAT)
■LAN Modem Site-to-Site Dial-in (LAN-to-LAN bidirectional connectivity)
■Advanced Dial-in (unknown router accessing a LAN Modem)
Single User Dial-in
Single User Dial-in describes a scenario where a client workstation dials into a LAN
Modem via a single analog modem (or another 56K LAN Modem, see below).
With Single-User Dial-in the server-side LAN Modem assigns a single IP address to
the incoming client, as shown in Figure 5.
Figure 5 Single User Dial-in
Single-User Dial-in from Another 56K LAN Modem: While Single-User
Dial-in provides only one IP address to the dial-in client, the dial-in client may still
be another LAN Modem with several attached workstations. In this case, the
client-side LAN Modem uses NAT to share the single IP address provided by the
server-side LAN Modem, similar to a typical ISP connection, as shown in Figure 6.
Note that unlike the LAN Modem Site-to-Site scenario (described later), the Single
User scenario does not provide for bidirectional LAN-to-LAN connectivity. While
authorized workstations attached to the client LAN Modem can share the
connection to the server LAN Modem, workstations connected to the server LAN
Modem cannot access client-side resources.
Figure 6 Single User Dial-in with NAT
Public telephone
network
ALERT
LANSTATUS
POWERB1B2TX1
234
COLL
ISDN
OK
ISDNLANModem
3C892
Small office LAN
OfficeConnect
56K LAN Modem
Telephone line
Analog modem
Telecommuter
PWR TEST D B1 B2 SD RD DTR
3Com
Impact IQ
¤
3Com
1
9
8.162.2.2
198.162.2.3
Server side LAN Client side LAN
OfficeConnect
56K LAN Modem
198.162.2.4 198.162.2.4
OfficeConnect
56K LAN Modem
Client
Server LAN Modem issues
single IP address to
incoming client
Client LAN Modem
uses NAT to translate
issued IP address
Public telephone
network
Client
Server

14 OFFICECONNECT 56K LAN MODEM RELEASE NOTE V. 7.2.0
Choose Single-User Dial-in when your dial-in user will access a server LAN Modem
via a single analog modem, or via a LAN Modem that will share one IP address for
all attached workstations. Note that in this scenario, workstations on the
server-side cannot access client-side resources.
LAN Modem Site-to-Site Dial-in
LAN Modem Site-to-Site dial-in describes a scenario where a LAN Modem dials
into another LAN Modem, with multiple IP addresses assigned to each LAN device
on both sides of the connection, as shown in Figure 7. This scenario allows
workstations on both sides of the connection to access servers and resources on
each LAN, providing bidirectional LAN-to-LAN connectivity.
When the LAN Modem Site-to-Site scenario is first configured via the Dial-in
Wizard, the client LAN Modem (or the LAN Modem which has been designated
Site B) will automatically change its default IP address and restart. This is to
distinguish between each LAN Modem’s subnet address, which by default are
identical (192.168.1.x).
Figure 7 LAN Modem Site to Site Dial-in
In LAN Modem Site-to-Site Dial-in, the target LAN Modem provides its WAN IP
address as the DNS server to the client LAN Modem. This scenario allows users
across the connection direct access to all available workstations via domain name
or IP address.
Choose LAN Modem Site-to-Site when your dial-in user will access a LAN Modem
from another LAN Modem, where LAN resources are accessible on both ends of
the connection.
Advanced Dial-in
Use Advanced Dial-in for scenarios where a router other than a LAN Modem dials
into a LAN Modem. Advanced Dial-in assumes that both routers have been
manually configured for static IP addressing, and each employs a unique range of
addresses.
Choose Advanced Dial-in if your LAN is using static IP addressing, or your dial-in
user will be accessing the LAN Modem from a router other than a LAN Modem.
Note that Advanced Dial-in is the most complex dial-in scenario and may require
the assistance of your MIS administrator. Refer to “Configuring the Server-side
Dial-in User Parameters Page” for more information.
Site A Site B
OfficeConnect
56K LAN Modem OfficeConnect 56K LAN Modem
Public telephone
network
Server
(Site A)
192.168.1.1
Client
(Site B)
192.168.2.1

Configuring the Server-side Dial-in User Parameters Page 15
Once you have chosen a dial-in scenario that best fits your dial-in criteria, you are
ready to create a dial-in user profile. Refer to “Create a Dial-In User Profile Using
the Dial-In Wizard” or “Configuring the Server-side Dial-in User Parameters Page”
to manually create or further define Dial-in users.
Configuring the
Server-side Dial-in
User Parameters Page
Once the Dial-in Wizard has created a Dial-in User account profile, you can further
define the dial-in user parameters or manually create a new Dial-in user via the
Dial-in User Parameters page.
You can create a total of ten dial-in user profiles. If you have created ten profiles
and would like to add a new user, you must delete one profile before adding a
new one.
To access Dial-in User profiles, do the following.
1Click the Dial-in Users button.
The Dial-in User Selection screen opens, as shown in Figure 8.
Figure 8 Dial-in User Selection Screen
2Choose either New Dial-in User to manually create a new profile or choose an
existing Dial-in User from the drop-down list and click Select.
The Dial-in User Parameters screen opens, as shown in Figure 9.

16 OFFICECONNECT 56K LAN MODEM RELEASE NOTE V. 7.2.0
Figure 9 Dial-in Users Parameters Screen
3In the Name field, enter a unique name to designate this dial-in user. This value
should correspond with the username configured on the client.
4In the Password field, enter a password to verify access when this user dials into
the LAN Modem. This value should correspond with the password configured on
the client.
5In the Type of Use field, select the scenario for which your dial-in situation applies.
Refer to “Understanding the Three Dial-in Scenarios” for more information.
■Choose Single-User Dial-in if this user will be accessing the LAN Modem
from an analog modem or from another LAN Modem on which attached
workstations can share a single IP address.
■Choose LAN Modem Site-to-Site if this user will be dialing in from another
LAN Modem which utilizes bidirectional LAN-to-LAN connectivity.
■Choose Advanced if this user will be accessing the LAN Modem from a
router other than a LAN Modem. This scenario requires that all IP addresses
be statically configured, and should be configured by your MIS
administrator.
6In the Idle Timer field, enter the length of inactivity before the LAN Modem drops
the incoming call. To disable the Idle Timer, set this field to 0. In this case all
incoming calls must be manually dropped via the LAN Modem’s Manual Call
Control page. By default this value is 900 seconds (15 minutes).

Configuring the Server-side Dial-in User Parameters Page 17
7In the Data Compression field, choose to have data compression active or inactive.
By default compression is disabled. (In order for compression to occur, the other
end of the connection must have the same compression active.)
Callback Parameters
This section allows you to enable and configure callback functionality. Callback
occurs when, upon a successful connection of a dial-in a user, the LAN Modem
drops the incoming call and places a return call to the dial-in user.
To specify your Callback parameters, do the following. In order for callback to
occur, the other end of the connection must support callback functionality and
have it enabled. For more information refer to “Service Provider Callback Feature”.
1In the Enable Callback field, check to activate Callback for this dial-in user. By
default Callback is disabled.
2In the Callback Telephone Number field, enter the number the LAN Modem will
call back when this dial-in user accesses the LAN Modem, to verify the dial-in
user’s authenticity. Note that this value will override the telephone number
provided by the client, if the client provides a different number.
3In the Callback Authentication field, check the box to require callback
authentication. Note that Callback Authentication is not required for callback
functionality, but provides a further level of security by confirming the server’s
authenticity to the dial-in user.
4In the Callback Username and Password fields, enter the username and password
which the client will use to verify the server’s authenticity. If the dial-in client is a
LAN Modem, these values will match the username and password of the client
LAN Modem’s Callback Login and Password fields, located on the client LAN
Modem’s service provider parameters page.
5In the Callback Delay field, enter the amount of time in seconds to wait until the
dial-in user is called back. By default this is set to 5.
WAN Parameters
1LAN Modem WAN IP: If the local LAN Modem WAN link has a static IP address,
enter the WAN static IP address. Otherwise leave these fields as set by the Dial-in
Wizard. If you are using the Advanced dial-in scenario, enter the IP address of the
LAN Modem which is receiving the dial-in call.
2Remote Entity WAN IP: If the remote site of the WAN link has a static IP address,
enter the WAN static IP address. Otherwise leave these fields as set by the Dial-in
Wizard. For the Advanced dial-in scenario, enter the IP address of the router which
is dialing into the LAN Modem.
3Remote Entity WAN Subnet Mask: If the remote site of the WAN link has a static IP
address, enter the WAN subnet mask address. Otherwise leave these fields as set
by the Dial-in Wizard. If you are using the Advanced dial-in scenario, enter the
subnet mask of the remote LAN.
4Enter your Primary and Secondary (optional) DNS address as instructed by your
MIS administrator, or as set by the Dial-in Wizard. For the Advanced dial-in
scenario, enter the IP address of the LAN Modem which is receiving the dial-in call.
5Click Submit.

18 OFFICECONNECT 56K LAN MODEM RELEASE NOTE V. 7.2.0
Placing a Call to a
Server LAN Modem Once you have created a service provider profile on your client LAN Modem, you
can place a call in one of two ways: You can use the client LAN Modem’s Manual
Call Control page to manually place a call, or you can simply enter an IP address or
domain name of a server attached to the remote LAN Modem, and place the call
automatically.
Once connected, you can use all LAN resources available on the server end of the
connection. For further information, such as tech tips and FAQs, visit the LAN
Modem’s Internet Homepage at
http://www.3com.com/support/docs/lanmodem.
Service Provider
Callback Feature In addition to the callback capability for dial-in calls to the LAN Modem, the LAN
Modem now supports callback functionality for outgoing calls to a service provider
(such as an ISP or Private Network) that supports callback functionality.
When a LAN Modem places an outgoing call to a service provider which supports
callback functionality, once the call connects, the remote server drops the call and
places a return call to the LAN Modem, providing a further level of security.
Service Provider Callback options are set via the Service Provider Parameters page.
Refer to “Setting Up a Connection to a Server LAN Modem” for more
information.
Upgrade Check
Feature The LAN Modem now provides an Upgrade Check feature which will query the
LAN Modem’s Internet homepage for available firmware updates.
Note that you must have a service provider with Internet access configured in
order to use the Upgrade Check feature.
To check for new firmware updates, do the following.
1Access the LAN Modem main page by entering http://3com.oc.lanmodem
in the location bar of your Web browser.
2Click the Advanced button located in the left frame.
The Advanced frame opens.
3Click the Upgrade Check button.
4Click Check for Upgrades to check for new firmware which may be available for
your LAN Modem.
A call is launched to your ISP. The LAN Modem compares the latest available
firmware against the firmware currently installed.
If your LAN Modem has the latest firmware installed, a message indicates that you
do not need to upgrade at this time.
If new firmware has been released, you will receive a message indicating that new
firmware is available. Click the Download link to access the LAN Modem Upgrade
page. Follow instructions to download the latest firmware.

Local DNS Table 19
Local DNS Table The LAN Modem now includes a local DNS Table for configuring up to ten static
DNS entries, allowing the LAN Modem to resolve designated IP addresses locally.
The Local DNS Table can be used to suppress spurious calls caused by an
application on the LAN generating packets, which is in turn launching unwanted
calls to your service provider.
For example, to suppress spurious calls, do the following. If an application on the
LAN is generating packets to “my_net.com”, you would enter “my_net.com” in
the Domain Name field, and then enter 192.168.1.29 in the IP address field. This
is an IP address that resides on the LAN Modem’s default subnet, but by default is
not used by any attached workstations. Now, packets to “my_net.com” will be
routed to this unused IP address, and will no longer launch automatic calls.
Another potential application of the Local DNS Table is to assign a domain name
to a frequently visited IP address. In this case, you would enter the IP address in the
IP address field, and enter a domain name of your choice, such as “my_site.com”
in the Domain Name field. This will resolve the name “my_site.com” to the
associated IP address.
Access the DNS Configuration Table by clicking the Advanced button from within
the LAN Modem’s main page. The DNS Configuration table opens, as shown in
Figure 10.
Figure 10 DNS Configuration Table
Enter the domain name and IP address as desired, and click Submit to save
changes.

20 OFFICECONNECT 56K LAN MODEM RELEASE NOTE V. 7.2.0
LAN Modem Desktop
Manager
(Windows 95/98/NT)
The LAN Modem Desktop Manager for Windows 95/98/NT provides direct access
to LAN Modem call functionality from the Windows desktop, without requiring
the use of a Web browser. The LAN Modem Desktop Manager is available for
downloading from the LAN Modem Internet homepage, and is also included on
the latest 3Com Companion Programs CD ROM which ships with the unit. The
following options are available.
■Place and hang up calls to service providers
■Monitor call status
■Display caller ID information for incoming voice calls (if available)
The LAN Modem Desktop Manager is installed into the Windows 95/98/NT
ToolTray. The application may be downloaded directly from the LAN Modem
Utilities web page: http://www.3com.com/support/docs/lanmodem/
util.html
Virtual Fax Modem
(Windows 95/98
and NT 4.0)
The Virtual Fax Modem for Windows 95/98/NT 4.0 is a 3Com customized
application which allows Windows users to access the LAN Modem as if it were
directly connected to your computer’s COM port. This feature permits connections
to on-line services such as America On-line as well as the sending of faxes
(class 2.0 or later) from any Windows computer which is attached to the LAN
Modem. Note that the Virtual Fax Modem client software must be installed on
every computer on the LAN which requires use of this feature. The Virtual Fax
Modem has been customized for use with the LAN Modem, and cannot be used
in conjunction with other WAN devices, such as routers or other LAN-based
modems.
When the Virtual Fax Modem connection is in use, no other calls can be placed or
received on your telephone line by any other user on the LAN.
The application, along with complete installation steps and configuration notes,
may be found on the latest 3Com Companion Programs CD-ROM, or downloaded
directly from the LAN Modem Utilities homepage:
http://www.3com.com/support/docs/
lanmodem/util.html.
Configuring the LAN
Modem for use with
Virtual Fax Modem
Once you have installed the Virtual Fax Modem client application, you can further
define the manner in which the Virtual Fax Modem interacts with the LAN Modem
via the Virtual Fax Modem Parameters page.
To Access the Virtual Fax Modem Parameters, do the following.
1From the LAN Modem mainpage, click the Advanced button.
The Advanced submenu opens.
2Click the Virtual Fax button.
The Virtual Fax Modem Parameters page opens, as shown in Figure 11.The
following options are provided.