Source address

This is where you can configure an optional sender address to be used instead of the one otherwise automatically selected for the destination address. If you have configured loopback addresses, you can specify them here as source address.

Note: If the source address set here is a loopback address, then the device will use this unmasked even for remote stations that are masked.
SNMP ID:
2.44.5 
Telnet path:
Setup > CWMP
Possible values:

Max. 16 characters from [A-Z][a-z][0-9]@{|}~!$%&'()+-,/:;<=>?[\]^_.`

Special values:
Name of the IP network (ARF network), whose address should be used.
"INT" for the address of the first intranet.
"DMZ" for the address of the first DMZ (caution: If there is an interface called "DMZ", then the device takes its address).
LB0 ... LBF for one of the 16 loopback addresses or its name
Any IP address in the form x.x.x.x.
Default:
empty