View Single Post
  #4   (View Single Post)  
Old 10th November 2010
SlyM SlyM is offline
Port Guard
Join Date: Nov 2010
Posts: 21
Default Now with 2 NICs installed...

Now I'd like to understand with 2 NICs installed for egress traffic, 1 for each ISP connection. With multipath default routes to each ISP's respective default gateway next hops, why is it that the box only uses the secondary ISPs connection exclusively?

If I issue a $ping

The ping times are appropriate for the usual latency of the secondary connection. This is confirmed by issuing a $traceroute and watching traffic go down that route.

If I issue a $ping -I {IP of the primary connection}

The pings work, and have the usual latency that can be expected on that line. This can also be confirmed by issuing a $traceroute -s {IP of the primary connection} and watching the traffic go down the primary line this time.

Then to really make matters worse, if I issue a $ping -I {IP of the secondary connection}
This does $traceroute -s {IP of secondary connection}

Why? It should work if it works when not specifying any address. And when not specifying any address, shouldn't it pick a connection to use at random or using a round-robin method with multipath routing enabled, or am I misunderstanding something again?
Reply With Quote