I need to change the running config on a 1700 series router. And for the life of me I think I am doing it wrong.
The router has two interfaces. An Ethernet (10meg) and a fast Ethernet. The site also has a /27 public IP block. The router is currently natting the IP's .
Here is the current interfaces configuration:
description connected to IP Phone System
ip address 24.75.X.X 255.255.255.224
description connected to EthernetLAN
ip address 192.168.2.100 255.255.255.0
ip nat inside
description connected to Internet
ip address 24.75.x.x 255.255.255.252
ip nat outside
service-module t1 timeslots 1-12
service-policy output Wan
Here is the current natting setup
ip nat pool internet-natpool-1 24.75.x.x 24.75.x.x netmask 255.255
ip nat inside source list 1 interface Serial0 overload
ip nat inside source static tcp 192.168.2.72 3389 24.75.x.x 3389 extendable
ip nat inside source static udp 192.168.2.72 5632 24.75.x.x 5632 extendable
ip nat inside source static tcp 192.168.2.72 5631 24.75.x.x 5631 extendable
ip nat inside source static tcp 192.168.2.1 2143 24.75.x.x 2143 extendable
ip nat inside source static tcp 192.168.2.1 2142 24.75.x.x 2142 extendable
We are installing a Sonic Wall on Fastethernet0. So I will be removing the NAT statements on fastethernet0 and serial0. I will also No out all the IP nat. I will apply 24.75.x.x 255.255.255.224 to fastthernet0. On the other side will be the sonic wall with another free public IP of 24.75.x.x 255.255.255.224. The natting of the rest will take place in the sonic wall.
My question is, because I already use ip address 24.75.X.X 255.255.255.224 on ethernet0. When I apply another IP with the same subnet on fastethernet0. Will that cause routing issues? If So how should I correct it?
1) take ethernet0 (it has its public IP and one other public ip) Should I split it up to 24.75.x.x 255.255.255.252 and then then 24.75.x.x 255.255.255..240 ?. But I don?t have enough free IP?s to do this?
Any advice will be great accepted.