[f-nsp] One Serveriron XL, multiple VLANs

[David J. Hughes]

On 01/12/2004, at 9:34 PM, Timothy Arnold wrote:

> I have one Serveriron XL but I need it to provide load balancing
> functions for multiple VLANs - i.e. multiple logical Serveriron's in 
> one
> physical unit - will it work?
>
> Also, all the Serveriron's that I have deployed, I typically have an
> 'outside' network where incoming clients connect from and a 'webserver'
> network where all the physical servers sit. Is it possible to have a
> one-arm configuration where clients will connect to 10.0.0.10 for
> example, which load balances web servers running on IPs 10.0.0.30 and
> 10.0.0.40 ?


Hi.

If you run your ServerIrons in layer 3 mode (i.e. "ip forward") you can 
do exactly what you've outlined above.  Setup a vlan for your client 
side and multiple vlans as server networks.  For each vlan configure a 
VE and allocate a layer 3 segment.  Have all your VIPs live in the 
"client vlan" address block.

For direct access to the real servers, have static routes for the 
"server vlan" address blocks on your core router pointing to the SI's 
"client vlan" VE address.  And, as I mentioned, make sure "ip forward" 
is turned on - just went through this with a mate and it worked much 
better when the box was told to route :-)   [Hi Michael ;-]


David
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