I have a WAN line with 3Com Router and I want to change this router for one Cisco 877. The parameters of line are these:
Authentication : chap or pap (i don't know) User and password are plain text.
NAT: Disable. NAT is done by Firewall.
WAN IP: automatic
LAN IP: IP public static.
I've already configured router but I don't know if the configuration is all right. I attach it.
Authentication,Routing looks ok.
you try connecting the same and let us know here.
Also if you have some production (working) traffic on the circuit you can try out doing this test after off peak/production hours.