gratuitous ARP with em interface.

[Ruslan Ermilov]

On Wed, May 28, 2003 at 07:57:07PM -0400, akanwar at digitarchy.com wrote:
> Hi all,
>   
> Is there a known issue with alias IPs on em interfaces not sending out
> gratuitous arps ?
> 
> The situation is as follows:
>  I am running a custom redundancy daemon that migrates the IP address of a
> server from one interface to another in case the active network path fails.
> Till now I was experimenting with two fxp interfaces and everything worked
> perfectly. i.e. when the ip address moved over (using a perl script to run
> ifconfig commands) it sent out grat. arps for each of its alias IPs. This
> allowed the router to update its Arp table and talk to the newly active
> interface.
> 
> Now when I try running the code with em (gigabit Ethernet over copper)
> NICs, I simply do not see the gratuitous arps come out of the new interface.
> 
> I am at a loss to understand what has changed. Could it be that the line
> DOWN -> UP time of the em interface is longer thereby causing a loss of
> ARPs ? Any suggestions ?
> 
Yes, I can reproduce this too, no gratuitous ARP is sent.


Cheers,
-- 
Ruslan Ermilov		Sysadmin and DBA,
ru at sunbay.com		Sunbay Software AG,
ru at FreeBSD.org		FreeBSD committer.
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