[c-nsp] SLB Question

[jcovini at free.fr]

Hi Paul,

I would suggest that you stay away from NAT.

 - Just get a pair of Cisco CSS1150x which will provide exactly what you need,
i.e layer 4 loadbalancing the quick and easy way. They also sells as linecards
which may fit within your 65xx if you got some free slots.

- If you can't, just implement Multicast-NLB onto your servers. This is a crappy
MS technology since it makes use of multicast Mac-address, and waste a bit of
bandwith (Nowadays, with these 10Gigs LANs...), but it's the cheapest solution I
know to achieve what you need without dedicated appliances. Ubercheapest might
also exist in the GNU/BSD world but I dunno any.

jc


Selon Paul Stewart <paul at paulstewart.org>:

> Hi folks...
>
> I've been reading about SLB and have a quick question I think....
>
> We have a pair of servers that will be providing SMTP/POP3/DNS - the data
> between the two are replicated in real-time.  The plan is to give each
> server a real IP address and then serve traffic in an active/standby
> configuration.  The servers are within the same subnet and there are several
> other servers in the same subnet that must communicate with them.
>
> Running NAT we'll presume is NOT an option in this setup.  The two servers
> are directly connected to a Catalyst 6500 running native IOS (sup2/msfc2)
>
> My question(s) are:
>
> Is there a way to have SLB answer a virtual address that is forwarded to the
> real IP of *one* of the servers while maintaining an active/standy
> configuration?  The docs only talk about load balancing itself.....
>
> I understand that with NAT you can do this but without NAT the options are
> much more limited?
>
> If we plugin each server to a seperate 6500, and run NAT - does this
> complicate matters or matter at all?  The obvious solution is to do this on
> the servers themselves
>
> Thanks in advance,
>
> Paul
>
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