Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

NAT config on 3825

i have a remote hub office (in denver) connected via a T-1 with three other offices hanging off it connected by T-1's. currently all the Internet traffic has to travel up to my office (125 miles) to get to the Internet. i want to turn the corner for Internet traffic at there hub location. I have placed the order for a T-1 to the Internet and have received the public ip address assigned by the ISP - LAN IP Block:

Now my questions are - is this enough ip addresses for 70 users and how should i NAT it on my router so there traffic uses the correct interface to go outside.



Re: NAT config on 3825


You can use just one public IP to NAT (PAT) all 70 users. You can save the other seven addresses from the pool assigned to you for future use. If there are devices, like servers, that need static one-to-one NAT you can use an address from that pool.

You may need a configuration like this:

int f0/0

description 'local lan'

ip nat inside

int s0/0.1

description 'office_1'

ip nat inside

int s0/0.2

description 'office_2'

ip nat inside

int s0/0.3

description 'office_3'

ip nat inside

int s0/0.4

descripton 'interface to ISP'

ip nat outside

ip nat pool cisco netmask

ip nat inside source list 150 pool cisco

access-list 150 permit tcp any any eq www

Hope that helps!



CreatePlease to create content