Date: Mon, 4 Apr 2011 12:22:49 +0200 From: Frederique Rijsdijk <frederique@isafeelin.org> To: "K. Macy" <kmacy@freebsd.org> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Network stack unstable after arp flapping Message-ID: <20110404102249.GB3421@deta.isafeelin.org> In-Reply-To: <BANLkTi=dvHagdukgUgp2SbcB37vRXvFbTA@mail.gmail.com> References: <20110401141655.GA5350@deta.isafeelin.org> <4D95E62A.5000109@comcast.net> <4D987B1B.4000608@isafeelin.org> <BANLkTin0RsisoLp-x9WinjvJuf3pmSz13w@mail.gmail.com> <20110404095333.GA3421@deta.isafeelin.org> <BANLkTi=dvHagdukgUgp2SbcB37vRXvFbTA@mail.gmail.com>
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Hi Kip,
Thanks. Any idea btw why this would also effect hosts that run 6.x and 7.x RELEASE versions? These do not have the flowtable sysctl.
-- Frederique
On Mon, Apr 04, 2011 at 12:09:05PM +0200, K. Macy wrote:
> Correct. Set it to zero and the flowtable will be bypassed.
>
> flowtable.c:
> static uint32_t
> ipv6_flow_lookup_hash_internal(
> struct sockaddr_in6 *ssin6, struct sockaddr_in6 *dsin6,
> uint32_t *key, uint16_t flags)
> {
> uint16_t sport, dport;
> uint8_t proto;
> int offset = 0;
>
> if ((V_flowtable_enable == 0) || (V_flowtable_ready == 0))
> return (0);
>
>
> Ciao
>
> On Mon, Apr 4, 2011 at 11:53 AM, Frederique Rijsdijk
> <frederique@isafeelin.org> wrote:
> > Kip,
> >
> > Which sysctl are we talking about exactly? Just to be sure..
> >
> > net.inet.flowtable.enable ?
> >
> >
> > -- Frederique
> >
> >
> >
> > On Sun, Apr 03, 2011 at 08:11:33PM +0200, K. Macy wrote:
> >> I don't think it was properly tested when it was enabled for IPv6.
> >> Given that I have been absentee it really should not be in the default
> >> kernel or at least the sysctl should be off. Sorry for the
> >> inconvenience. Additionally, you don't need to rebuild you can just
> >> disable the sysctl.
> >>
> >>
> >> -Kip
> >> On Sunday, April 3, 2011, Frederique Rijsdijk <frederique@isafeelin.org> wrote:
> >> > Steve,
> >> >
> >> > On 01-04-11 16:50, Steve Polyack wrote:
> >> >> On 04/01/11 10:16, Frederique Rijsdijk wrote:
> >> > [ .. ]
> >> >>> Mar 31 18:36:12 srv01 kernel: arp: x.x.x.1 moved from
> >> >>> 00:00:0c:9f:f0:3d to 00:00:0c:07:ac:3d on bge0
> >> > [ .. ]
> >> >>> The result of that, is that loads of FreeBSD machines (6.x, 7.x and
> >> >>> 8.x) developed serious network issues, mainly being no or slow traffic
> >> > [ .. ]
> >> >>> Any ideas anyone?
> >> >> We experienced a similar issue here, but IIRC only on our 8.x systems
> >> >> (we don't have any 7.x). Disabling flowtable cleared everything up
> >> >> immediately. You can try that and see if it helps.
> >> >
> >> > AFAIK this feature was introduced in 8.x? Btw you are here referring to
> >> > UDP, we had issues with TCP. It could still be related, perhaps I'll get
> >> > around emulating the situation and see if I can reproduce it.
> >> >
> >> >
> >> > -- Frederique
> >> >
> >> >
> >> > _______________________________________________
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> >> > http://lists.freebsd.org/mailman/listinfo/freebsd-net
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> >> >
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