Cisco SPA122 Administration Guide - Page 32

Configuring the Network Application Settings (SPA122 Only) 3 Field External Port, Internal Port Protocol IP Address Enabled Description For single port forwarding, specify the ports to use. For simplicity, the internal and external port numbers will often be the same. However, different external port numbers could be used to differentiate traffic of the same application type intended for different internal servers, or to promote privacy through the use of nonstandard ports. • External port: For single port forwarding, enter the port number that external clients will use to set up a connection with the internal server. • Internal port: For single port forwarding, enter the port number that the ATA uses when forwarding traffic to the internal server. The correct entries appear automatically if you choose a standard application from the Application Name list for Single Port Forwarding. Select the protocol(s) that can be forwarded: TCP, UDP, or Both. Enter the IP address of the local server that should receive forwarded traffic. To ensure correct forwarding of traffic, local servers must either be configured with a static IP address, or be assigned a reserved IP address through DHCP. Use the Interface Setup > LAN > DHCP Server page to reserve IP addresses. See Network Settings for the LAN and DHCP Server (SPA122 Only), page 20. Check the box to enable this port forwarding rule, or uncheck the box to disable it. The default setting is Disabled. Cisco SPA100 Series Phone Adapters Administration Guide 32