2 routes & 1 destinations

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Hi,

At office, we have I ISPs.

I want to lightly monitor each link latency in order to decide several 
routing.
For that, I have only one external server: 1 IP, it's an OVH dedicated 
server.
The quick picture is http://s24.postimg.org/n3436z64l/defaul_route.png

Default route is via ISP1.
If OVH-server pings IP1:
- the request will go through ISP1: it's OK
- the reply will go through ISP1: it's OK

If OVH-server pings IP2:
- the request will go through ISP2: it's OK
- the reply will go through ISP1: it's KO because the metric will 
involve ISP1

How could I tell the Office gateway (CentOS 6)
"IF you reply to a ping request from the OVH server that came on IP2
THEN route it via IP2"



-- 
+261 34 81 738 69

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