Date: Thu, 29 May 2003 14:38:54 +0300 From: Petri Helenius <pete@he.iki.fi> To: Ruslan Ermilov <ru@freebsd.org> Cc: freebsd-net@freebsd.org Subject: Re: gratuitous ARP with em interface. Message-ID: <3ED5F14E.8070205@he.iki.fi> In-Reply-To: <20030529083223.GA52253@sunbay.com> References: <63340-22003532823577384@M2W054.mail2web.com> <20030529083223.GA52253@sunbay.com>
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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@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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