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List:       loadbalancing-l
Subject:    Re: [load balancing] Alteon 180e, connect to virtual IP with a  real-server
From:       "Jeroen" <quagga () muntinternet ! nl>
Date:       2004-03-30 14:32:58
Message-ID: 029001c41663$e5f616a0$0201a8c0 () snowwhite
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RE: [load balancing] Alteon 180e, connect to virtual IP with a
real-server>Just to clarify, do you want to connect to a vip and get sent to
a server in a group, then from one of those real >severs, connect to the
same vip and get load balanced again?


>If that is what you want, then I don't *think* it is supported for a couple
of reasons. The firstly being that you run the risk of being NAT'd to
yourself and ended up with a packet with the same destination and source and
the other reason is that you have already been load balanced.

Yes that is exactly what we want and what I'm discussing, I really believe
that it is NOT possible because of the above (the loop), and someone else is
pointing to the manual and saying that it is there and that it should work.



>you should just connect to the HTTP service locally, which should give you
basically the same degree of load distribution. But if you have another
reason that I haven't considered you do have a couple of options.
>You can use PIP to full-nat the traffic or create different VIPs, each with
their own groups of servers not >containing the likely client, not the most
elegant solution, but workable.
>Usually the best bet is to connect locally and tie the two services
together, that way if one service fails, the whole >real server is removed
from load balancing. You don't really miss out on any load balancing
advantages as that is >performed on the initial request.

That is not possible, the script is web-based and is started from a client.
Then the script starts analysing the content on it's own VIP.


>I hope that helps,
Believe me, you did, I would like to hear how others think about your (and
mine) opinion.

>Richard.

Jeroen

-----Original Message----- 
From: Jeroen [mailto:quagga@muntinternet.nl]
Sent: Tuesday, 30 March 2004 8:33 PM
To: lb-l@vegan.net
Subject: Re: [load balancing] Alteon 180e, connect to virtual IP with a
real-server


> I had a similar issue in the past - that time it was due to a
misconfigured
> NAT filter; all outgoing traffic was being NATted by the Alteon and
> therefore never found its way to the VIP and back.  After inserting
another
> filter that simply allows the ICMP from real server range to VIP
> before
the
> regular NAT filter, this problem was resolved.  (A prerequisite for
> this
to
> work at all, though, is that the ports connecting your cluster servers
> needs to be defined as client ports, which you've rightly done.)
>
I'm not doing any NAT on the LB, the webservers are directly connected to
the outside network(and do have an internal network also). So there are no
filters that might be misconfigured.
Also DAM is enabled on the alteon. Someone replyed to me, and not the list,
and is suggesting PIP, but why define a proxy, that'll only break my log's
on the webserver.
Kind regards,
Jeroen
> Hope this is of any help!
>
> Cheers,
>     Henrik
>
> At 17:03 29-03-2004 +0200, you wrote:
> >Hi Group,
> >
> >I've learned a lot reading this list, but have an issue myself now.
> >
> >We have an Alteon 180e setup as a loadbalancer in front of a couple
> >of webservers.
> >
> >We have a script on the cluster that does some kind of link checking
> >and that needs to connect to the websites setup on the virtual server
> >of the cluster.
> >
> >So, in Alteon language,  actually we want to visit a website on the
virtual
> >IP from a client port, start a script there, and that script needs to
> >connect through the virtual server to one of the realservers in the
> >same cluster.
> >
> >The webservers are direclty connected to the loadbalancer and the
> >ports
on
> >the loadbalancer are configured as Server and Client and according to
> >the manual it should work, but it doesn't. We use cookie insertion on
> >the LB,
no
> >proxy's. Just a couple of real-servers, a couple of groups and for
> >the websites, one virtual server on port 80.
> >
> >The normal cluster setup is working great, it's just that the cluster
can't
> >connect to it's own virtual-hosts on it's own real-servers.
> >
> >  Does someone on this group have a clue?
> >
> >Thanx in advance,
> >
> >
> >Jeroen Wouda
> >
> >
> >
> >
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