I am trying to replace an existing old ADSL modem with a Cisco 857 ADSL router. Most of the config seems to work (my network can use the internet etc), however I am trying to configure it as follows:
INTERNET ----> 857 (static public IP on Dialer0, 192.168.2.1 on VLAN1) ---> Firewall (WAN: 192.168.2.250 / LAN: 10.11.0.0) ---> LAN router
What I want the 857 to do is be invisible in that if someone on the net attempts to SSH to my 857's public IP (or ping or whatever), the traffic actually hits the firewall's IP. Is this something like a straight IP to IP NAT? On other modems I've configured with fancy web front-ends it's had various descriptions.
What command do I need in my 857's config to achieve this please?
My current config:
Current configuration : 4238 bytes
no service pad
no service timestamps debug uptime
no service timestamps log uptime
no service dhcp
boot system flash:c850-advsecurityk9-mz.124-15.T15.bin
The NAT could be used as a solution but I am not sure about what is your objective: to drop the traffic targeted to your 857, or to transparently forward it to your firewall's IP address so that, for example, the firewall can be remotely configured using SSH?
If the traffic is to be dropped, we can do it on the 857 directly without forwarding it to the firewall to be dropped there.
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