Network stack unstable after arp flapping

[Frederique Rijsdijk]

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 at 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 at 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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