netdev - Re: ipv6 issues after an DDoS for kernel 4.6.3

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Message-ID: <1467989601.30694.3.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Fri, 08 Jul 2016 16:53:21 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Loganaden Velvindron <loganaden@...il.com>
Cc:	Toralf Förster <toralf.foerster@....de>,
	netdev <netdev@...r.kernel.org>
Subject: Re: ipv6 issues after an DDoS for kernel 4.6.3

On Fri, 2016-07-08 at 18:17 +0400, Loganaden Velvindron wrote:
> On Fri, Jul 8, 2016 at 6:14 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > On Fri, 2016-07-08 at 15:51 +0200, Toralf Förster wrote:
> >> I do run a 4.6.3 hardened Gentoo kernel at a commodity i7 server. A
> >> DDoS with about 300 MBit/sec over 5 mins resulted an issue for ipv6 at
> >> that system.
> >>
> >> The IPv6 monitoring from my ISP told my that the to be monitored
> >> services (80, 443, 52222) weren't reachable any longer at ipv6 (at
> >> ipv4 there was no issue). Restarting the NIC brought back green lights
> >> for the services at the ipv6 ports too.
> >
> > Hard to tell without knowing DDOS details, but IPv6 lacks some
> > scalability improvements found in IPv4.
> >
> > IPv4 no longer has a routing cache, but IPv6 still has one.
> >
> 
> Any pointers as to which part of the kernel to look for to implement
> one for IPv6 ?

net/ipv6/route.c and net/ipv4/route.c ?