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Chris Paul wrote (at Wed, Jun 02, 2004 at 09:49:19AM +0100):
> Hello,
>
> This is all getting a bit heavy for my liking, but can someone please confirm
> the state of play for me.
>
> I was under the impression that this problem is because of a bug in older
> versions of the Linux Kernel. From the amount of discussion about attempted
> workarounds, I get the impression the problem still exists and can be
> reproduced with even the latest kernels.
>
> Is this the case?
I am unable to verify whether or not I still have the problem now that
I'm running kernel 2.6.6. The customer I have that was experiencing
the issue had already upgraded his router, fixing it for him, and may
or may not be able to confirm the problem's existence from the small
subset of his users that were seeing it.
With these workarounds, though, I'm a little bit confused by the
thread .. what exactly would be the workaround, and how would I
implement it?
> TIA
>
> Chris
>
> -----Original Message-----
> From: Julian Anastasov [mailto:ja@xxxxxx]
> Sent: 01 June 2004 22:51
> To: Joseph Mack
> Cc: LinuxVirtualServer.org users mailing list.
> Subject: Re: Large HTTP GET/POST timeout
>
>
>
> Hello,
>
> On Mon, 31 May 2004, Joseph Mack wrote:
>
> > > > so what is the MTU doing in the output of `ip addr show dev tunl0`?
> > > >
> > > > I can set it (can't I?). Is the mtu meaningless, ignored, what?
> > >
> > > It is ignored for IPVS traffic, IPVS has its own encapsulation
> > > and uses the route to RIP. IIRC you do not need to configure tunl0
> > > in director.
> >
> > So PMTU cannot work for ip_vs?
>
> I mean tunl0 is usually needed to receive IPIP packets, so
> in normal cases you do not need such interface in director even
> when using TUN real servers. The PMTU setting must be for the route
> to RIP. Such setting (and special route to daddr=RIP) can be needed
> only if PMTU to RIP is less than the outdev MTU.
>
> > In that case Ratz idea of setting the mtu for the route (DIP->RIP) won't
> > work?
>
> It is needed but it is not on tunl0, eg. it is via eth0
>
> > So should people set the MTU on the VIP for an LVS-Tun director?
>
> The VIP does not play here. The forwarded traffic is
> routed to daddr=RIP (as for the other forwarding methods). Only the
> clients need a route to VIP.
>
> Regards
>
> --
> Julian Anastasov <ja@xxxxxx>
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> Berkeley Alexander
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--
Casey Zacek
Senior Engineer
NeoSpire, Inc.
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