Date: Mon, 4 Apr 2011 12:25:39 +0200 From: "K. Macy" <kmacy@freebsd.org> To: Frederique Rijsdijk <frederique@isafeelin.org> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Network stack unstable after arp flapping Message-ID: <BANLkTi=y5S%2Bzo43U4jLK_X0ZrMm68Ma1LA@mail.gmail.com> In-Reply-To: <20110404102249.GB3421@deta.isafeelin.org> 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> <20110404102249.GB3421@deta.isafeelin.org>
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On Mon, Apr 4, 2011 at 12:22 PM, Frederique Rijsdijk
<frederique@isafeelin.org> wrote:
> 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.
Uhm ... no. That would definitely be unrelated. I'm just taking their
word for it. And I can see how the flowtable might not handle ARP
flapping properly.
We'll need to do more diagnostics. So this is only IPv6 and you are using T=
CP?
-Kip
>
> -- 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(
>> =A0 =A0 =A0 struct sockaddr_in6 *ssin6, struct sockaddr_in6 *dsin6,
>> =A0 =A0 =A0 =A0 =A0 uint32_t *key, uint16_t flags)
>> {
>> =A0 =A0 =A0 uint16_t sport, dport;
>> =A0 =A0 =A0 uint8_t proto;
>> =A0 =A0 =A0 int offset =3D 0;
>>
>> =A0 =A0 =A0 if ((V_flowtable_enable =3D=3D 0) || (V_flowtable_ready =3D=
=3D 0))
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 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 defaul=
t
>> >> 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.
>> >>
>> >>
>> >> =A0-Kip
>> >> On Sunday, April 3, 2011, Frederique Rijsdijk <frederique@isafeelin.o=
rg> 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 a=
nd
>> >> >>> 8.x) developed serious network issues, mainly being no or slow tr=
affic
>> >> > [ .. ]
>> >> >>> Any ideas anyone?
>> >> >> We experienced a similar issue here, but IIRC only on our 8.x syst=
ems
>> >> >> (we don't have any 7.x). =A0Disabling flowtable cleared everything=
up
>> >> >> immediately. =A0You can try that and see if it helps.
>> >> >
>> >> > AFAIK this feature was introduced in 8.x? Btw you are here referrin=
g to
>> >> > UDP, we had issues with TCP. It could still be related, perhaps I'l=
l get
>> >> > around emulating the situation and see if I can reproduce it.
>> >> >
>> >> >
>> >> > -- Frederique
>> >> >
>> >> >
>> >> > _______________________________________________
>> >> > freebsd-net@freebsd.org=A0mailing list
>> >> > http://lists.freebsd.org/mailman/listinfo/freebsd-net
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rg"
>> >> >
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