Pentagram Cerberus P6371 User manual

Installation and Operation Manual
PENTAGRAM Cerberus P6371
The latest versions of manual, drivers and applications are available on
www.pentagram.eu
2008-10-07

NOTE! Any information and technical data are subject to change without prior notification
and/or indication in this manual.
© 2008 PENTAGRAM
All rights reserved; copying and reproduction is strictly forbidden.

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INDEX
INTRODUCTION........................................................................................................................ 5
FEATURES ...................................................................................................................................5
PACKAGE CONTENTS ................................................................................................................6
PRODUCT OVERVIEW ............................................................................................................. 6
IMPORTANT NOTES ....................................................................................................................6
FRONT PANEL .............................................................................................................................6
BACK PANEL ...............................................................................................................................7
DEFAULT SETTINGS ...................................................................................................................7
RESETTING ROUTER ..................................................................................................................7
CONNECTING CERBERUS TO COMPUTER. .............................................................................8
CONFIGURE TCP/IP.....................................................................................................................8
CONFIGURE ROUTER VIA WEB BROWSER ....................................................................... 13
LOGIN .........................................................................................................................................13
NAVIGATION ..............................................................................................................................14
STATUS TAB ..............................................................................................................................15
BASIC SETTINGS / QUICK SETUP ...........................................................................................16
NETWORK / LAN........................................................................................................................17
NETWORK / WAN.......................................................................................................................18
NETWORK / MAC CLONE..........................................................................................................27
DHCP / DHCP SETTINGS ..........................................................................................................28
DHCP / DHCP CLIENTS LIST .................................................................................................... 29
DHCP / ADDRESS RESERVATION ...........................................................................................29
FORWARDING / VIRTUAL SERVERS .......................................................................................30
FORWARDING / PORT TRIGGERING .......................................................................................31
FORWARDING / DMZ.................................................................................................................33
FORWARDING / UPNP...............................................................................................................33
SECURITY / FIREWALL .............................................................................................................34
SECURITY / IP ADDRESS FILTERING ......................................................................................35
SECURITY / DOMAIN FILTERING .............................................................................................37
SECURITY / MAC ADDRESS FILTERING .................................................................................38
SECURITY / REMOTE MANAGEMENT .....................................................................................39
SECURITY / ADVANCED SECURITY ........................................................................................40
STATIC ROUTING ......................................................................................................................41
IP & MAC BINDING / BINDING SETTINGS................................................................................42
IP & MAC BINDING / ARP LIST .................................................................................................43
DYNAMIC DNS ...........................................................................................................................43
SYSTEM TOOLS / TIME SETTINGS ..........................................................................................44
SYSTEM TOOLS / FIRMWARE UPGRADE ...............................................................................45
SYSTEM TOOLS / FACTORY DEFAULTS ................................................................................ 45
SYSTEM TOOLS / BACKUP AND RESTORE ........................................................................... 45
SYSTEM TOOLS / REBOOT ......................................................................................................46
SYSTEM TOOLS / LOG..............................................................................................................47
SYSTEM TOOLS / STATISTICS.................................................................................................47
TROUBLESHOOTING............................................................................................................. 49
USING LEDS TO DIAGNOSE PROBLEMS................................................................................49
PROBLEMS WITH RESOLVING IP ADDRESS FROM THE ROUTER’S DHCP SERVER IN
WINDOWS VISTA .......................................................................................................................49
PROBLEMS WITH THE WEB INTERFACE ...............................................................................50
PROBLEMS WITH THE LOGIN USERNAME AND PASSWORD..............................................50
PROBLEMS WITH LAN INTERFACE ........................................................................................50
PROBLEMS WITH THE INTERNET ACCESS ...........................................................................50
INTERNET CONNECTION DISCONNECTS:..............................................................................50

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Introduction
The Cerberus P 6371 Router integrates 4-port Switch, firewall and NAT-router. Its design is
dedicated to Small Office/Home Office (SOHO) network solutions. The Cerberus P 6371
Router will allow you to connect your network better than ever, sharing Internet Access, files
and fun, easily and securely.
Features
•Complies with IEEE 802.3, IEEE 802.3u standards.
•One 10/100M Auto-Negotiation RJ45 WAN port, 4 10/100M Auto-Negotiation RJ45 LAN
ports, supporting Auto MDI/MDIX.
•Shares data and Internet access for users, supporting PPPoE, Dynamic IP, Static IP,
L2TP, PPTP, BigPond Cable Internet access.
•Supports Virtual Server, Special Application and DMZ host.
•Supports UPnP, Dynamic DNS, Static Routing, VPN Pass-through.
•Connecting Internet on demand and disconnecting from the Internet when idle for
PPPoE.
•Built-in NAT and DHCP server supporting static IP address distributing.
•Built-in firewall supporting IP address filtering, Domain Name filtering, and MAC address
filtering.
•Supports connecting/disconnecting from the Internet on a specified time of day.
•Supports access control, parents and network administrators can establish restricted
access policies based on time of day for children or staff.
•Supports Flow Statistics.
•Supports ICMP-FLOOD, UDP-FLOOD, TCP-SYN-FLOOD filter.
•Ignores Ping packets from WAN or LAN ports.
•Supports firmware upgrade.

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Package Contents
1. PENTAGRAM Cerberus P 6371 router
2. Power adapter 9 V, 0,8 A
3. Ethernet cable (RJ-45)
4. CD
5. Quick Installation Guide
Product Overview
Important Notes
•Do not use the router in high humidity or high temperatures.
•Do not use the same power source for the router as other equipment.
•Do not open or repair the case yourself. If the router is too hot, turn off the
power immediately and have it repaired at a qualified service center.
•Avoid using this product and all accessories outdoors.
•Place the router on a stable surface.
•Only use the power adapter that comes with the package. Using a
different voltage rating power adaptor may damage the router.
Front Panel
LED Action Description
Not lit No PowerPWR Lit up Power on
Lit up The router is initializing
Flashing The router is working properly
SYS
Not lit The router has a hardware error
Not lit There is no device linked to the corresponding port
Lit up There is a device linked to the corresponding port but no activity
WAN / 1-4
Flashing There is an active device linked to the corresponding port

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Back Panel
Label Used for...
POWER Connecting with supplied power adapter
LAN 1-4 (RJ-45) Connecting with computers/devices through Ethernet cable
WAN (RJ-45) Connecting with DSL/cable modem through Ethernet cable
RESET Resetting the device.
Default Settings
Before changing configuration familiarize yourself with these default settings.
IP Address 192.168.1.100
Subnet Mask 255. 255. 255.0
DHCP Server Enabled
DHCP Server IP Address Pool 100 IP addresses
from 192.168.1.101
IP Address Lease Time 7200 seconds (2 hours)
User Name admin
Password pentagram
It is recommended to change User Name and Password as soon as possible.
If you ever forget the password to log in, you may need to restore the factory default settings.
This procedure is described on the next page.
Resetting router
•Use the Factory Defaults function on System Tools -> Factory Defaults page in the
router's Web-based Utility, or
•Use the RESET button: First, turn off the router's power. Second, press and hold the
default reset button then turn on the router's power, until the SYS LED lights up (about 3
seconds). Last, release the reset button and wait for the router to reboot.

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Connecting Cerberus to Computer.
Connecting via Ethernet Port (Ethernet Card)
All Ethernet ports of router are made in the technology, which automatically activates
Crossover if necessary. Thanks to autonegotiation of connection speed the router will
automatically select the maximum available speed rate. Transfer at 10/100 Mbit/s rate
requires the category 5 cable wired with RJ-45 connectors. In case of "straight" cable both
connectors must be crimped in standard EIA/TIA 568B. In case of Crossover cable one
connector must be in standard EIA/TIA 56A, and the second in EIA/TIA 568B. After connecting
the device to one of the ports, corresponding LED will begin to blink. That signals the process
of the auto-checking of port and the negotiation of connection speed rate.
Configure TCP/IP
After connecting the computer to the router the TCP/IP protocol should be configured. The
protocol should be automatically installed together with Network card drivers. It is advised that
TCP/IP should be configured to receive IP address and all the necessary network parameters
from DHCP server automatically. You can find step-by-step configuration for different
Windows systems below.

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Windows Vista
Note: Network configuration require administrator privileges. When User Account Control
window pops up, either click Continue (Administrator user) or select Administrator user and
enter valid password (Standard user).
1. Click Start →Control Panel.
2. Click View network status and tasks.
3. Click View status for appropriate
connection.
4. On General tab, Click the Properties
button.
5. On General tab, select Internet Protocol
Version 4 (TCP/IPv4) and click
Properties.

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6. On General tab, select Obtain an IP
address automatically and Obtain DNS
server address automatically.
7. Click OK to save settings and close
Internet Protocol Version 4 (TCP/IPv4)
Properties window.
Note: In some cases Windows Vista cannot obtain an IP address from certain router’s DHCP
server. If you encounter this, follow this steps to resolve this problem (Microsoft Support page)
http://support.microsoft.com/kb/928233/en-us

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Windows 2000/XP
1. Click Start →Settings →Control Panel.
Double-click the Network Connections icon
(2000/XP Classic view) or click Network and
Internet Connections icon and then Network
Connections icon (XP Default view).
2. Double-click the Local Area Connection icon.
3. On General tab, Click the Properties button.
4. On General tab, select Internet Protocol
(TCP/IP) and click Properties.
5. On General tab, select Obtain an IP address
automatically and DNS server address
automatically.
6. Click OK to save settings and close Internet
Protocol (TCP/IP) Properties window.

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Windows 95/98/Me
1. Click Start →Settings →Control Panel.
Double-click the Network icon.
2. On Configuration tab, select TCP/IP for
appropriate network adapter and click
Properties.
3. On IP Address tab, select Obtain an IP
address automatically.
4. On DNS Configuration tab, select Disable
DNS
5. Click OK to save settings and close TCP/IP
Properties window.
To make sure that network adapter properly obtained an IP address from router’s DHCP
server:
1. click Start > Run
2. type cmd (Win 2000/XP) or command (Win 95/98/ME) and press Enter
3. in command line type ipconfig /all and press Enter
4. check if the IP Address is 192.168.1.x

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Configure router via web browser
Cerberus P 6371 router can be configured via web browser, which is usually integrated with
operating system. Router offers clear and simple interface.
Login
1. Launch the Web browser
2. In address bar enter the default IP address: http://192.168.1.100
3. Enter username and password – default admin / pentagram

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Navigation
Left pane – Navigation menu.
Center pane – Contents of element selected from navigation menu.
Right pane – Online help concerning contents of the center pane.

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Status Tab
Router Status
•Firmware Version – Firmware Version.
•Hardware Version – Hardware Version.
LAN
•MAC Address – MAC address used by router in LAN.
•IP Address – IP address used by router in LAN.
•Subnet Mask – LAN subnet mask.
WAN
•MAC Address – MAC address assigned for WAN port.
•IP Address – IP address assigned for WAN port.
•Subnet mask – Subnet mask assigned for WAN port.
•Default Gateway – The IP address of the default gateway.
•DNS Server – The IP address of the DNS server.

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Basic Settings / Quick Setup
Quick Setup menu will help you to configure the basic network parameters.
To begin configuration, click the Next button.
Quick Setup - Choose WAN Connection Type
Select WAN Connection Type your ISP is using and click the Next button to configure it (not
applicable for Dynamic IP).
•Quick Setup - PPPoE
Enter Account Name and Password provided by your ISP and click the Next button, to
continue.

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•Quick Setup - Static IP
Enter IP Address,Subnet Mask,Default Gateway and Primary/Secondary DNS
server address provided by your ISP and click the Next button to continue.
Quick Setup - Finish
Click the Finish button to save changes and exit Quick setup.
Network / LAN
MAC Address – MAC address used by router in LAN.
IP Address – Enter IP address which will be used by router in LAN.
Subnet Mask – Select LAN subnet mask.

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Network / WAN
Appearance of this page depends on option selected from WAN Connection Type list.
•Dynamic IP
Select this WAN Connection Type, if your ISP is running a DHCP server.
Host Name - This field is required to be filled by some service provider.
IP Address - The IP address assigned by your ISP dynamically.
Subnet Mask - The subnet mask assigned by your ISP dynamically.
Default Gateway - The default gateway assigned dynamically by your ISP.
Click the Renew button to renew the IP parameters from your ISP.
Click the Release button to release the IP parameters.
MTU Size - The normal MTU (Maximum Transmission Unit) value for most Ethernet
networks is 1500 Bytes. For some ISPs you need reduce the MTU. But this is rarely
required, and should not be done unless you are sure it is necessary for your ISP
connection.
Use These DNS Servers - If your ISP gives you one or two DNS IP addresses, select
this option and enter the primary and secondary addresses into the correct fields.
Otherwise, the DNS servers will be assigned dynamically from ISP.
Primary DNS / Secondary DNS - (Optional) Enter the DNS IP address in dotted-decimal
notation provided by your ISP. Note: If you get 'Address not found' errors when you go to
a Web site, it is likely that your DNS servers are set up improperly. You should contact
your ISP to get DNS server addresses.
Get IP with Unicast DHCP - A few ISPs' DHCP servers do not support the broadcast
applications. If you can't get the IP Address normally, you can choose Unicast. (You
generally need not check this option).
Click the Save button to save this settings.

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•Static IP
Select this WAN Connection Type, if your ISP provides a static or fixed IP Address,
Subnet Mask, Gateway and DNS setting.
IP Address - Enter the IP address in dotted-decimal notation provided by your ISP.
Subnet Mask - Enter the subnet Mask in dotted-decimal notation provided by your ISP.
Default Gateway - (Optional) Enter the default gateway in dotted-decimal notation
provided by your ISP.
MTU Size - The normal MTU (Maximum Transmit Unit) value for most Ethernet networks
is 1500 Bytes. For some ISPs, you may need to modify the MTU. But this is rarely
required, and should not be done unless you are sure it is necessary for your ISP
connection.
Primary DNS / Secondary DNS - (Optional) Enter the DNS IP address in dotted-decimal
notation provided by your ISP.
Click the Save button to save this settings.
•PPPoE
Select this WAN Connection Type, if your ISP provides a PPPoE connection.

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User Name/Password - Enter the User Name and Password provided by your ISP.
These fields are case-sensitive.
Connect on Demand - You can configure the router to disconnect your Internet
connection after a specified period of the Internet connectivity (Max Idle Time). If your
Internet connection has been terminated due to inactivity, Connect on Demand enables
the router to automatically re-establish your connection as soon as you attempt to access
the Internet again. If you wish to activate Connect on Demand, click the radio button. If
you want your Internet connection to remain active at all times, enter 0in the Max Idle
Time field. Otherwise, enter the number of minutes you want to have elapsed before your
Internet connection terminates. Note: Sometimes the connection cannot be disconnected
although you specify a time to Max Idle Time because some applications visit the
Internet continually in the background.
Connect Automatically - Connect automatically after the router is disconnected. To use
this option, click the radio button.
Time-based Connecting - You can configure the router to make it connect or disconnect
based on time. Enter the start time in HH:MM for connecting and end time in HH:MM for
disconnecting in the Period of Time fields. Note: Only when you have set the system
time on System Tools -> Time page, the Time-based Connecting function can take
effect.
Connect Manually - You can configure the router to make it connect or disconnect
manually. After a specified period of inactivity (Max Idle Time), the router will disconnect
your Internet connection, and not be able to re-establish your connection automatically as
soon as you attempt to access the Internet again. To use this option, click the radio
button. If you want your Internet connection to remain active at all times, enter 0in the
Max Idle Time field. Otherwise, enter the number in minutes that you wish to have the
Internet connecting last unless a new link requested. Note: Sometimes the connection
cannot be disconnected although you specify a time to Max Idle Time because some
applications visit the Internet continually in the background.
Click the Connect button to connect immediately.
Click the Disconnect button to disconnect immediately.
Click the Save button to save this settings.
Click the Advanced button to set up the advanced options: