gratuitous ARP with em interface.

[Sreekanth]

Could be attributed to the spanning tree in the switch.I have seen it
happening(especially with cisco switches).I bet you are not able to send
out any packet(Not just Garp).

Sreekanth

> -----Original Message-----
> From: owner-freebsd-net at freebsd.org 
> [mailto:owner-freebsd-net at freebsd.org] On Behalf Of Petri Helenius
> Sent: Thursday, May 29, 2003 4:39 AM
> To: Ruslan Ermilov
> Cc: freebsdnic at mailbox.cps.intel.com; akanwar at digitarchy.com; 
> freebsd-net at freebsd.org
> Subject: Re: gratuitous ARP with em interface.
> 
> 
> 
> I haven't looked that deep into why, but em is quite slow on 
> coming up 
> compared to
> fxp for example. Probably something to do with hardware 
> re-initialization.
> 
> Pete
> 
> 
> Ruslan Ermilov wrote:
> 
> >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,
> >  
> >
> 
> 
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