Re: gratuitous ARP with em interface.

From: Ruslan Ermilov (ru_at_FreeBSD.org)
Date: 05/29/03

  • Next message: Petri Helenius: "Re: gratuitous ARP with em interface." 
    Date: Thu, 29 May 2003 11:32:23 +0300
To: "akanwar@digitarchy.com" <akanwar@digitarchy.com>, Prafulla Deuskar <pdeuskar@FreeBSD.org>

    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, 

    -- 
Ruslan Ermilov		Sysadmin and DBA,
ru@sunbay.com		Sunbay Software AG,
ru@FreeBSD.org		FreeBSD committer.

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