From: Alex Flex <aflexzor@gmail.com>
To: netfilter@vger.kernel.org
Subject: Re: synflood +syncookies + conntrack strange behaviour
Date: Sat, 11 May 2013 12:05:40 -0600 [thread overview]
Message-ID: <518E8874.4090801@gmail.com> (raw)
In-Reply-To: <20130511022114.GA7793@localhost>
Pablo,
Thank you for clearing that aspect! I now understand why not always do i
get an error...
However the following two points still have me confused..
a.) If I enable syn cookies, shouldnt it stop completely the SYN RECV
state connections in my netstat? Because i still do get them a lot. In
fact my tests reveal that with or without syn cookies the maximum
connections in SYN RECV always reach 256 and then no more connections
are allowed.
b.) I tried disabling iptables all together (thus no conntrack) and I
still saw 100% packetloss , iam sure iamnot hitting a cpu or link limit
because previously i hit a 100k pps 50mbits, and now iam doing half that
for testing and still using syncookies. Why would i still be lossing
packets?
Thanks
Alex
next prev parent reply other threads:[~2013-05-11 18:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-10 1:04 synflood +syncookies + conntrack strange behaviour Alex Flex
2013-05-11 0:07 ` Alex Flex
2013-05-11 2:21 ` Pablo Neira Ayuso
2013-05-11 18:05 ` Alex Flex [this message]
2013-05-11 18:26 ` Pascal Hambourg
2013-05-11 18:47 ` Alex Flex
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