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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: xx.xxx.80.168/29(255.255.255.248).

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.

thanks,

1 REPLY

Re: NAT config on 3825

Hi,

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 xx.xxx.80.170 xx.xxx.80.170 netmask 255.255.255.248

ip nat inside source list 150 pool cisco

access-list 150 permit tcp any any eq www

Hope that helps!

Regards,

Sundar

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