Re: Load balancing + NAT issue on BNT GBE 2-7 equipement

Hi Clement,

NAT process for most load balancers use to work this way:

         Original packet at the outside interface:
Client IP (src) -> External Interface Load Balancer VIP (dst)

         Translated packet at the unside interface:
Internal Load Balancer VIP (src) -> Server (dst)

However, if you can't fix this, try adding a host route like this in  =

the server:

route add -host ExternalLoadBalancerIP gw InternalLoadBalancerIP

Regards,
-- =

Javier Checa
Germinus XXI | Gesfor



Cl=E9ment Gam=E9 <[email protected]> ha escrito:

> Hi guys,
>
> I've got troubles configuring an Hardware load-Balancer with NAT function=
s.
>
> I have the following architecture:
>
> Internet =3D=3D=3D> VIP (public) [Load Balancer] (private ip) =3D=3D=3D=
=3D> private
> addressed servers
>
> When a connection is initialised from the outside (internet) , the LB
> correctly forwards the SYN packet to one of the private servers. But
> when these servers want to reply with a SYN/ACK there is a problem.
>
> the SYN packet coming in the private servers has as ip header : VIP =3D>
> Private_server_Address
>
> The answer packet then logically has: Private_server_Address =3D> VIP ,
> in its source =3D> dest ip header
>
> But the private servers cannot reach VIP from their side (this is
> normal since it's nated), and then provide a correct reply.
>
> Have you guys any solution to correctly forward the packets back to the
> LB, and make it process them correctly ?
>
> Note: The load balancer, which is the default gw for the servers, also
> has a NAT rule for "masquerading" (actually more SNAT than real
> masquerading)
>
> Regards,
>
> Cl=E9ment.
>
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