Re: 404 errors running an LVS-Tun

To: Joe Peters <joseph.peters@xxxxxxx>
Subject: Re: 404 errors running an LVS-Tun
Cc: <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
From: Julian Anastasov <ja@xxxxxx>
Date: Mon, 27 Aug 2001 23:36:56 +0000 (GMT)

On Mon, 27 Aug 2001, Joe Peters wrote:

> Hi,
> We are running a linux cluster based upon Red Hat 6.2 kernel (2.2.14). We
> are using IP tunneling to send the traffic from the director to two real
> servers.
> We occasionally encounter a problem where our home page cannot be found. A
> refresh of the page solves the problem. We have not been able to produce the
> problem using a Netscape browser. Internet Explorer seems to trigger the
> problem.
> Has anyone ever heard or seen something like this? I'm trying to figure out
> whether the problem is a DNS issue (we recently changed the DNS information
> for the Web site), an issue with LVS or a browser based issue (all sorts of
> cache configurations on the browser seem to do no good).

        I can add more reasons here. So, better you to check your
web server access logs or to provide "tcpdump -ln host CLIENT_IP" output
from your sessions. For the test you can try to work with one real
server only, or may be to isolate a real server that is not synced. Do
you use service that requires persistence? HTTPS?

> To hide the ARP we have used the following commands on the real servers:
> echo 1 > /proc/suys/net/ipv4/conf/tunl0/hidden
> echo 1 > /proc/suys/net/ipv4/conf/all/hidden
> On the real servers, we have also enabled IP forwarding.

        It is not needed for normal operation.

> --
> Joe Peters
> Webmaster
> University of Massachusetts Boston


Julian Anastasov <ja@xxxxxx>

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