[Cluster-devel] Re: [PATCH] [DLM] Bind connections from known local address when using TCP

[Steven Whitehouse <swhiteho@redhat.com>]

Hi,

On Thu, 2007-10-25 at 18:49 -0400, Lon Hohberger wrote:
> A common problem occurs when multiple IP addresses within the same
> subnet are assigned to the same NIC.  If we make a connection attempt to
> another address on the same subnet as one of those addresses, the
> connection attempt will not necessarily be routed from the address we
> want.
> 
> In the case of the DLM, the other nodes will quickly drop the connection
> attempt, causing problems.
> 
> This patch makes the DLM bind to the local address it acquired from the
> cluster manager when using TCP prior to making a connection, obviating
> the need for administrators to "fix" their systems or use clever routing
> tricks.
> 

I'm happy to apply the patch, but I wonder why not just set the prefsrc
for the route? That will fix it for all applications not just the DLM.
Also if there are multiple NICs in the system with the same IP address
set assigned to them, then this solution may fail whereas the prefsrc
solution will continue to work as that allows specification of a device
too (amoung other things),

Steve.