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Leased address in an ACL?

I have an 1841 router that gets it's internet-facing interface's address by my ISP's DHCP server. How can I use that address in an ACL, in a way that it will stay effective when it gets a new leased address?

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Re: Leased address in an ACL?

I have an 1841 router that gets it's internet-facing interface's
address by my ISP's DHCP server. How can I use that address in an ACL,
in a way that it will stay effective when it gets a new leased address?

Hi,

If your question is ACL needs to bind the ip address assigned from your isp and it should change automatically when ip address changes then i think you cannot configure access-list to reference to the DHCP assigned ip address dynamically.

Hope to Help !!

Ganesh.H

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Beginner

Re: Leased address in an ACL?

Wow that sucks! No work around to this? I want to block spoofed traffic with the same address as my external interface as well as allow ssh (over a specific port) to that interface only.

Its weird that ACL are the only things you can't define by interface vs. ip address. I guess it is what it is!

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