I've been searching on how to setup port forwarding on a 877, but the information I find all use NAT for this, like the example below for forwarding to a mail-server:
ip nat inside source static tcp 10.0.0.2 25 interface dialer 1 25
As the word 'nat' is used, I guess the data on the LAN-side would use the routers IP-Address (eg 10.0.0.1) ; but I need to know the original address (the client's address somewhere on the internet), but how to do such a setup is the information I can't find in the topics mentioning 'port forwarding'.
Can anyone confirm which address the internal server would see ? And if it is the router's address, would it be possible with another config to get the external address ?
Remark: It is a little unfair to post this, as I didn't test if I interprete the config-line correct, but the problem is that I can't bring the current router down if I'm not sure the new one will act equally. So it's more a question during the planning phase...which I want to implement as soon as possible ;)