
9
Theaccess frominternet
Sometimesyoumightneed tovisityour IPcamera from internet.Suchasyou
wanttosee your petswhenyouatoffice.Youcancontrolthehomecamerasend
thepets’videotoyoubyusinginternet.Youhavetodosomeconfigurationsof
yourrouterbeforeyouvisityourcamera frominternet.
Youcamimagetherearemanycamerasandcomputersareconnectingthe
sameinsidenetworkportofrouter.Theroutercangetapublic networkIP
address (suchas202.102.3.11) toconnecttheinternet,howeveritassign
insidenetworkportaddress for eachdeviceasLANIPaddress, suchas
192.168.0.xxx.
Youcanchoosefollowmethodstomodifyrouterconfiguration.Afterthatthe
remoteusercanvisityour IPcamera.
Youcanachievethis goalbyenableReversalNAT(RNAT)functionofIPSharing
Device.
1. VirtualServer”:Manyroutershave VirtualServer”support.Youmust
forward theWAN80 TCPporttoLANIPCamera’sIPand Port.(If youvisit
210.82.13.21’s80 portoutside,youwill beforwardtoLAN192.168.0.2’s80
port).
2. Anothermethod is the DMZ Host”.If enabledtousea LANdeviceasthe
DMZ host,theoutsidePCwill beablevisitthis LANdevicedirectly,asifthere
is noIPSharing Deviceexists. This method supportonly oneLANdevice
exposed totheWAN.Thus, if youhavemoreIPCameras, youhavetouse
theabovemethod.
TheDynamicDomainNameaccess
Thedynamic domainname(DDN)access isusingDDNsystemtomappinga
user’sdynamic IPaddress toasettleddynamic domainnameservice.Itmakes
upofServerprogramandCustomerprogram.TheCustomerprogramsendsthe
dynamic IP address ofhostcomputertoServerprogram,andthentheServer
programupdatethedatanow.AlsotheServerprogramcanprovideasettled
domainnamefor customer.ThenewIPaddress will betiedwiththesettled
domainnametogetherbyServerprogram.Atthis timethedynamic domain
nameservice(DDNS)is done,and your servercanbevisitedbyothers.
ThefunctionofDDNSis achievingtheresolutionbetweendynamic IPaddress
andsettleddomainname.AftergettingthenewIP address, userhastoapply
updatedatafrom DNSeverytime.Whentheuseris online,someonewantsto