about ip spoofing...attack

Unanswered Question
Oct 29th, 2007
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hi, I have some question.

Arp spoofing attack was makes down of our some network.

I want to privent this attack.

I found DAI to cisco web-site.

But Our Network is non-DHCP envirenment.

I read the cisco document of DAI.

according to document, configur ARP ACL non-DHCP envirnemet.

but we have 1000 over host.

input the 1000 over arp acl to C6509?

please, other way?

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jsivulka Fri, 11/02/2007 - 07:04
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One of the IOS features that you are probably interested in is called Unicast Reverse-Path verification. There are other mechanisms as well such as Access Control Lists that can help protect against IP Address spoofing.

Below is a link that explains in more detail the Unicast Reverse-Path verification:


Enabling DHCP Snooping is fairly straightforward, here is the guide:


clarkl2006 Sat, 11/03/2007 - 11:30
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Thanks for your reply.

But Attack Server located in same VLAN.

This Server was Flooding 1 mac-address and all IP Address of VLAN.

After all, All host was down in same VLAN.

If One mac-address have many IP Address(Attacking), then it possible limit one mac-address per IP address? like a limit mac-address number.

I want to defense of Local IP Flooding Attack.

Now I was mapping of important Server's IP and mac.


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