Re: [load balancing] Alteon SLB communication between VIPs

From: Ken Thurman <thudinga [izzat] yahoo.com>
Date: Fri Feb 03 2006 - 09:05:03 EST

Hi Erich,

  Did you enable client processing on the port that
the web servers connect to the Alteon on? Did you
create an interface on the AD3 for the 192.168.4.0/24
network to be used as the gw for the app servers?

Regards,

Ken

--- Erich Pletsch <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
> , RIP=192.168.3.2, RIP=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
> , RIP=192.168.3.2, RIP=192.168.3.3) (group 1).
> The Alteon has a VIP to represent the two app
> servers (VIP = 192.168.2.6
> , RIP=192.168.4.2, RIP=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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>

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Received on Fri Feb 3 11:24:06 2006

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