[LARTC] multiple gateways causes problem

[LARTC] multiple gateways causes problem

[Sudheer Divakaran]

Hi all,

My machine has got two network cards and both of them are connected to 
two different ISPs.  I have added two ISPs to my default gateway with 
same metric.

Let a.b.c.d be the IP of 1st network card and e.f.g.h be the ip of the 
second network card

i.e., Card1 - IP=a.b.c.d,  Gateway=gateway1.isp1.net
      Card2 - IP=e.f.g.h,  Gateway=gateway2.isp2.net


route add -net 0/0 gw gateway1.isp1.net metric 0
route add -net 0/0 gw gateway2.isp2.net metric 0
   

My problem is, if I try to access the 1st Network card (a.b.c.d  --  
ISP1) from a remote machine, sometimes the connection  takes a long time 
to establish.  Is it due to the reply packets going through the second 
ISP?.  If so how can I rectify this while maintaining both routes?.  
When I removed the second ISP from the routes, everything is working 
fine.   Also, I don't have any problem in accessing these machine from 
my Lan.


One more thing to note is that I don't have any problem in access the 
second IP (e.f.g.h  of ISP2) even if BOTH THE ROUTES are in my routing 
table (with  same  metric).

What could be wrong here?

Thanks,
Sudheer
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