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Just an update on that:
It seems that the problem was caused by a real-server with was answering
ARP-requests for the VIP.
After silencing that real server (i.e. fiddling a little bit with sysctl and
ip) the problem was gone.
Kind regards, Nils
> -----Original Message-----
> From: Hildebrand, Nils, 232
> Sent: Monday, September 11, 2006 10:24 AM
> To: 'LinuxVirtualServer.org users mailing list.'
> Subject: RE: Connection table clears and ipvsadm stops
> distributing the lo ad
>
> Hi,
>
> the entries themselv can't be the problem (directly) - I see
> something between 500 and the theoretic maximum is about
> 2000. I now established a cron-job to take a closer look at
> the numbers.
>
> The connect itselv is very short lvs just does the
> connection, the answer goes from the real-server directly
> back to the client - but both are very short-lived.
>
> Could the problem lie somewhere deeper inside the IP-Stack?
>
> About 1000 Clients permanently reconnecting - are there some
> IP-timeouts I should consider setting lower?
>
> Kind regards,
>
> Nils
>
>
> > -----Original Message-----
> > From: Joseph Mack NA3T [mailto:jmack@xxxxxxxx]
> > Sent: Thursday, August 31, 2006 3:42 PM
> > To: LinuxVirtualServer.org users mailing list.
> > Subject: Re: Connection table clears and ipvsadm stops distributing
> > the load
> >
> > On Thu, 31 Aug 2006, Hildebrand, Nils, 122 wrote:
> >
> > > We are doing load-balancing for http with DR/WLC and had a
> > persistency
> > > of one hour. After we raised the persistency to 8 hours and later
> > > reduced it to
> > > 3 hours we ran into a strange problem:
> > >
> > > After some time "ipvsadm -Lc" does not show any
> > connections, while all
> > > connections go to only one real server (the other real
> > server is not
> > > contacted any longer).
> >
> > people running long persistence times report weird stuff like this.
> > Since it's hard to do experiments with a setup that takes 8hrs (or
> > whatever) to do a test, we've never found out whether the
> problems are
> > unique to that user or a bug.
> >
> > You don't tell us how many connections are involved
> (millions, half a
> > dozen?). There are explanations for what you see. Your
> clients could
> > be coming in from an AOL like proxy and all be directed to the same
> > realserver. You'd need to connect from clients with
> different IPs to
> > check this out.
> >
> > Otherwise I have no idea what the problem is
> >
> > Joe
> >
> > [...]
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