gratuitous ARP with em interface.
mvsjetti at hss.hns.com
mvsjetti at hss.hns.com
Thu May 29 09:15:55 PDT 2003
I had checked the kernel code of the freeBsd. In case of fxp port "
will be called when we add a new address to an interface(using the if_ioctl
pointer from the
in_ifinit fucntion). And this fuction will inturn call the arp_ifinit
fucntion which sends the gratituos ARP.
I am not able to find this kind of fucntionality for em. I am not the sure
whether the code i am having
was incomplete or some fucntonality was missing in the implementation. This
may be the case of
incomplete intitlaization( if_ioctl of the ifp may not be initlized
If u can do kernel debugging put break point at the "arp_ifinit" and verify
if this was getting called
"Sreekanth" <sreekanth at redlinenetworks.com>@freebsd.org on 29/05/2003
Sent by: owner-freebsd-net at freebsd.org
To: "'Petri Helenius'" <pete at he.iki.fi>, "'Ruslan Ermilov'"
<ru at freebsd.org>
cc: freebsdnic at mailbox.cps.intel.com, freebsd-net at freebsd.org,
akanwar at digitarchy.com
Subject: RE: gratuitous ARP with em interface.
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).
> -----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
> 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
> >>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.
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