Re: [load balancing] Alteon SLB communication between VIPs

From: Erich Pletsch <erich [izzat] uvnet.net>
Date: Fri Feb 03 2006 - 10:31:27 EST

Client processing is enabled for the ports that the RIPs are on.

What is a Proxy IP? I haven't used that before. Might that help with
this problem?

Thanks!

Jason J. W. Williams wrote:

> Hi Erich,
>
> Have you turned client processing on for the port that the web
> server RIPs are hanging off of?
>
> Also, you can't put your web server and app server RIPs on the same
> subnet with two different VIPs (if you want the web server RIPs to be
> able to talk to the app server VIP) unless you use Proxy IPs. Even so
> that rarely works really well.
>
> Best Regards,
> Jason
>
> On 2/2/06, *Erich Pletsch* <erich@uvnet.net <mailto:erich@uvnet.net>>
> wrote:
>
> If someone has already posted this question, please forgive my
> inability
> to find it in the archive.
>
> I have an Alteon AD3 (an older load balancer, but it's really been a
> good piece of equipment).
>
> In the past all of the traffic has come in from the Internet to a
> pair
> of web servers that are load balanced. That was simple enough to
> configure. They then talked to a single app server which talked to a
> single database server as follows:
>
>
> Request -> Alteon -> www1 -> App Server -> DB Server
> www2
>
> The Alteon had a VIP to represent the two web servers (VIP =
> 192.168.2.5 <http://192.168.2.5>
> , RIP=192.168.3.2 <http://192.168.3.2>, RIP= 192.168.3.3
> <http://192.168.3.3>). The DB Server and APP server were
> on the same subnet as the VIP. Everything worked fine.
>
> So, now I'm trying to add redundancy into the app server. I
> purchased a
> second app server and configured port 2 on the alteon. here's the
> new
> concept:
>
> Request -> Alteon -> www1 -> App Server 1 -> DB Server
> www2 App Server2
>
> The Alteon has a VIP to represent the two web servers (VIP =
> 192.168.2.5 <http://192.168.2.5>
> , RIP=192.168.3.2 <http://192.168.3.2>, RIP=192.168.3.3
> <http://192.168.3.3>) (group 1).
> The Alteon has a VIP to represent the two app servers (VIP =
> 192.168.2.6 <http://192.168.2.6>
> , RIP=192.168.4.2 <http://192.168.4.2>, RIP=192.168.4.3
> <http://192.168.4.3>) (group 2).
>
> I moved the app servers onto their own subnet to try to keep them
> from
> attempting to short circuit the load balancer and talk directly
> back to
> the app server. However, I have the same problem described below if
> they're on the same subnet.
>
> Now, from outside the Alteon I can talk through the Alteon via the
> VIP
> to either cluster and they respond correctly.
>
> The problem is that I can't seem to get them to talk to each other
> through the Alteon via the VIPs - which is necessary in order to make
> this work. If I try to ping the VIP of group 2 from either member of
> group 1, I get timeouts. however, I can ping either of the real
> IPs and
> get replies. And, I can have group 1 talk directly to either of the
> group 2 servers individually via their RIPs.
>
> Same if I try the same procedure from group 1 to group 2.
>
> It's like the Alteon doesn't have a route back to the servers or
> something.
>
> So, my question is, how do I get the Alteon to enable
> communication from
> one group to another group on the same switch via RIPs?
>
> Has anyone had this problem before?
>
> Thanks in advance,
>
> Erich
>
>
>
>
>
>
>
>
>
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Received on Fri Feb 3 12:48:21 2006

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