cisco nat, dynamic ip from isp

[Gergo Vadasz]

Hi!

I think I understand the cisco NAT-PAT thing, but I try to manage this at my office with a 1841 router, and I don't know how to solve, that my ISP uses dynamic IP-s, and every 24 hours the public IP address is changing.

Must I change the router config every day to use NAT-PAT?

Thank you and sorry for the noob question!

Gergő from Hungary

[cadet alain · Accepted solution]

Hi,

No, just use the NAT overload feature like this:

ip nat inside source list 1 interface g0/0 overload

where int g0/0 is your external interface with the DHCP address.

Regards

Alain

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[Gergo Vadasz]

Hi Alain!

Thank you for your reply. I forgot to mention, that my ISP needs a pppoe authentication. Does's this information change your answer? I need the replace the interface g0/0 to Dialer1?

Thank you!

[cadet alain]

Hi,

Yes you're correct.

Regards

Alain

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