RE: gratuitous ARP with em interface.

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To: <akanwar@digitarchy.com>, <freebsd-net@freebsd.org>
Date: Thu, 29 May 2003 17:49:11 -0700

I did a quick test just now and...
Interestingly I did see GARP packets on the network with Em copper
connected to a 100base Switch(I don't have a gigabit Copper switch
rightnow).
You might want to try these things.
1) Ping immediately after the link comes up and see if it succeeds.(In
1000baseTX switch).
2) Connect it to a 100Base port and try.
3) Connect to another machine with crossover cable and try

First try 1 and if it fails try 2 and 3.

Hope it helps.

Sreekanth

> -----Original Message-----
> From: owner-freebsd-net@freebsd.org
> [mailto:owner-freebsd-net@freebsd.org] On Behalf Of
> akanwar@digitarchy.com
> Sent: Thursday, May 29, 2003 4:54 PM
> To: sreekanth@redlinenetworks.com; mvsjetti@hss.hns.com;
> pete@he.iki.fi; ru@freebsd.org;
> freebsdnic@mailbox.cps.intel.com; freebsd-net@freebsd.org;
> akanwar@digitarchy.com
> Subject: RE: gratuitous ARP with em interface.
>
>
> Thanks all for you replies.
>
> > I haven't tried this, but I think the problem would go away if you
> > changed WAIT_FOR_AUTO_NEG_DEFAULT to 0 in "if_em.h".
>
> Changed this. Did not work.
>
> > If u can do kernel debugging put break point at the
> > "arp_ifinit" and verify if this was getting called or
> > not.................. cheers, mahesh
>
> Will try this.
>
> > 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).
>
> No. Spanning tree is turned off (Tried it with both IOS and
> Catalyst switches).
>
> > 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.
>
> Correct, there is a delay. "ifconfig em0 inet x.x.x.x/y"
> takes a few seconds to complete whereas "ifconfig fxp0 inet
> x.x.x.x/y" returns instantly.
>
>
> Is there a way to force gratituous arp ? ( Short of writing a
> raw socket
> utility)
>
> Thanks,
> -ansh
>
> > > >On Wed, May 28, 2003 at 07:57:07PM -0400,
> > > akanwar@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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