74 Domain name:There are two modes: Default domain name and custom domainname.Except default domain name registration, you can also use custom domain name (Youcan input your self-defined domain name.) After successful registration, you can usedomain name to login installed of the device IP. User name: It is optional. You can input your commonly used email address.Important Do not register frequently. The interval between two registrations shall be more than60 seconds. Too many registration requests may result in server attack. System may take back the domain name that is idle for one year. You can get anotification email before the cancel operation if your email address setup is OK.4.10.2.5 UPnPThe UPNP protocol is to establish a mapping relationship between the LAN and the WAN.Please input the router IP address in the LAN in Figure 4-57. See Figure 4-61. UPNP Enable :Select to enable the UPNP function of the device. Status: When the UPNP is offline, it shows as “Disable”. When the UPNP works itshows“ Enable” Router LAN IP: It is the router IP in the LAN. WAN IP: It is the router IP in the WAN. Port Mapping List:The port mapping list here is the one to one relationship with therouter’sportmappingsetting . List: Service name:Defined by user. Protocol: Protocol type Internal port:Port that has been mapped in the router. External port:Port that has been mapped locally. Default: UPNP default port setting is the HTTP, TCP and UDP of the DVR.Double click one item; you can change the corresponding mapping information. SeeFigure 4-62.Important:When you are setting the router external port, please use 1024~5000 port. Do notuse well-known port 1~255 and the system port 256~1023 to avoid conflict.For the TCP and UDP, please make sure the internal port and external port are thesame to guarantee the proper data transmission.