How to check which NIC Card is used for backups?

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Operating Systems Linux How to check which NIC Card is used for backups?

10-19-2010

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How to check which NIC Card is used for backups?

I have a linux box with 2 nic cards on it one for prod and one for backup.
My question is while the backup are happening how do I determine which nic is used for backups . I would like to run a command so that that I can see the usage in a dynamic fashion.

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Code:

 netstat(1)                                                       netstat(1)

           -i                Show the state of network interfaces.  Only the
                             interfaces that have been configured with an IP
                             address or the plumb option using the ifconfig
                             command are shown.  The output includes both
                             the primary and logical interfaces.  (See
                             ifconfig(1M)).  The counts for Ipkts and Opkts
                             fields are for IP packets only.  This option is
                             ignored if the -p option is specified.

           -I interface      Show information about the specified interface
                             only.  This option applies to the -g and -i
                             options.

---------- Post updated at 02:19 PM ---------- Previous update was at 02:18 PM ----------

lsof will verify where what process has what socket open to.

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IDeally during the backups the data should be pushed only through backup nic. I dont think netstat will confirm that.

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Lsof will tell you where it connected, and if routing is doing the interface selection, you can traceroute the IP to ensure that is working. I am not that often able to play with lsof, but it may tell you enough about the connection. Also, the backup stats should change little or none until you start backup.

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Quote:

Originally Posted by new2prog

IDeally during the backups the data should be pushed only through backup nic. I dont think netstat will confirm that.

What makes you think netstat won't allow detecting the most active nic ?

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Do both have a route to the backup server? Are they on different subnets? iptraf will help if you have it installed

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Quote:

Originally Posted by jlliagre

What makes you think netstat won't allow detecting the most active nic ?

what makes you think the backup is the least active? Ideally it should be, but one should really try for more solid information than that.

Is it possible to see which interface a network socket is bound to, once you open it? If so you could open a do-nothing socket to the backup system and check which interface it used...

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