Re: Using Policy Routing to stop DoS attacks

On Tue, 25 Mar 2003 09:06:01 -0500 Christian Liendo <cliendo@globix.com> wrote:

I am sorry if this was discussed before, but I cannot seem to find this. I want to use source routing as a way to stop a DoS rather than use access-lists.

If you fooled the router into thinking that the reverse path for the source is on another another interface and then used strict unicast RPF checking, that may accomplish what you want without using ACLs. I don't know what impact it would have on your CPU however, you'll have to investigate or provide more details. Note, depending on the platform and configuration, filters/ACLs may have an insignficant impact on the CPU. If they don't, don't forget to complain to your vendor. :-) John