Re: gratuitous ARP with em interface.

From: Petri Helenius (pete_at_he.iki.fi)
Date: 05/29/03

  • Next message: Brad du Plessis: "Re: USB Modem support" 
    Date: Thu, 29 May 2003 14:38:54 +0300
To: Ruslan Ermilov <ru@freebsd.org>

    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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