Date: Thu, 29 May 2003 19:54:28 -0400 From: "akanwar@digitarchy.com" <akanwar@digitarchy.com> 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. Message-ID: <191690-220035429235428215@M2W038.mail2web.com>
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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, > > > > > > > > > > > > _______________________________________________ > > freebsd-net@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/free>; bsd-net To > > unsubscribe, send any mail to > > "freebsd-net-unsubscribe@freebsd.org" > > > > --- > > Incoming mail is certified Virus Free. > > Checked by AVG anti-virus system (http://www.grisoft.com). > > Version: 6.0.483 / Virus Database: 279 - Release Date: 5/19/2003 > > > > > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/free>; bsd-net > To > unsubscribe, send any mail to > "freebsd-net-unsubscribe@freebsd.org" > > > --- > Incoming mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.483 / Virus Database: 279 - Release Date: 5/19/2003 > > -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ .
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