[DRBD-user] Using DRBD between hosts with dual redundant network interfaces

Ward Horner whorner98 at yahoo.com
Tue Jul 5 23:38:51 CEST 2005

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Here's the scenario I am trying to solve:

I have two computers each with two network interfaces. Both network 
interfaces are on different networks and use different switches. Neither 
network can communicate with the other. This is a typical dual redundant 
network  topology.

I want to setup drbd to be able to use BOTH networks. If a network fails, 
it would be disabled, however communications would continue on the other 

For example:
--> On the primary host, eth0 is set to and eth1 is set to eth0 and eth1 are on different subnets and different physical 
--> On the secondary host, eth0 is and eth1 is
--> Both eth0's can communicate and both eth1's can communicate, but eth0 
and eth1 on different hosts cannot.
--> I want to set up drbd to be able to use both eth0 and eth1 for 
communication. On each host, all info that goes to eth0 should also be sent 
to eth1.
--> drbd services on the each host should be able to receive duplicate 
communication over both eth0 and eth1 and not get confused.

I realize this is a difficult scenario and drbd probably does not handle 
this type of configuration. This is, however, a very common redundant 
network setup. So I was wondering if there is a way to setup drbd to 
operate in this type redundant network. Does anyone know if this is 
possible? Does anyone have any thoughts or ideas on this issue?


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