troubleshooting Question

Cisco 1800 NAT using secondary ip

Avatar of snowdog_2112
snowdog_2112Flag for United States of America asked on
6 Comments1 Solution1895 ViewsLast Modified:
Cisco 1841 router
2 WAN connections (t1, cable)
s0 - t1
fa0/0 - inside (66.x.y.z, secondary)
fa0/1 - cable (24.x.y.z)

I have a secondary ip on fa0/0:

On the firewall hanging off the inside which also has a secondary ip of

I am NAT'ing some traffic from inside the firewall to

I need to NAT that traffic to fa0/1 (cable).

I have:

ip nat inside source list 101 interface fa0/1 overload

access-list 101 permit ip any
access-list 101 permit ip any

i also put an acl on the fa0/0 interface so i can see hits from coming in.  The 101 acl shows no hits though.

I wonder if it has to do with that secondary IP on fa0/0.


Our community of experts have been thoroughly vetted for their expertise and industry experience.

Join our community to see this answer!
Unlock 1 Answer and 6 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 1 Answer and 6 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros