Re: FreeBSD DDoS protection

2013-02-12 Thread Ian Smith
On Wed, 13 Feb 2013 01:52:29 +0100, Dag-Erling Smørgrav wrote: > Mark Felder writes: > > Dropping ICMP is not a security method. Please stop doing this! > Slight correction: dropping *all* ICMP is a bad idea. You can get by > with just unreach. Add timex, echoreq and echorep for troublesho

Re: FreeBSD DDoS protection

2013-02-12 Thread Dag-Erling Smørgrav
Mark Felder writes: > Dropping ICMP is not a security method. Please stop doing this! Slight correction: dropping *all* ICMP is a bad idea. You can get by with just unreach. Add timex, echoreq and echorep for troubleshooting. For IPv6, you want unreach, toobig, neighbrsol and neighbradv. Add

Re: FreeBSD DDoS protection

2013-02-12 Thread Mark Felder
On Sun, 10 Feb 2013 06:48:08 -0600, Janne Snabb wrote: Please do not drop all ICMP unless you understand what you are doing. By doing that you are creating a path MTU discovery blackhole. I was coming here to say the exact thing Dropping ICMP is not a security method. Please stop doing this!