See below Jared Mauch On Aug 20, 2010, at 6:16 PM, Brandon Ross <bross@pobox.com> wrote:
On Fri, 20 Aug 2010, Valdis.Kletnieks@vt.edu wrote:
Until a PC or something on the network gets pwned, and issues selective forged ICMP redirects to declare itself a router and the appropriate destination for some traffic, which it can then MITM to its heart's content. *Then* you truly have a manure-on-fan situation.
I believe the question was along the lines of, "why do I turn this off on my router?"
How does turning off ICMP redirects on the router prevent a rouge PC from sending ICMP redirects to it's neighbors?
I'm in the same boat here. I know there's a lot of conventional wisdom that says to turn it off, but I'm yet to hear a convincing argument as to why I should bother. Now configuring your hosts to ignore them, that I could understand.
The issue is routers typically do this in software requiring a punt and CPU theft from bgp, ospf etc.
-- Brandon Ross AIM: BrandonNRoss ICQ: 2269442 Skype: brandonross Yahoo: BrandonNRoss