RE: gratuitous ARP with em interface.

mvsjetti_at_hss.hns.com
Date: 05/29/03

  • Next message: Scot Loach: "Socket option to get dst port" 
    To: "Sreekanth" <sreekanth@redlinenetworks.com>
Date: Thu, 29 May 2003 21:47:07 +0530

    hi,
    I had checked the kernel code of the freeBsd. In case of fxp port "
    fxp_ether_ioctl" fucntional
    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
    properly).

    If u can do kernel debugging put break point at the "arp_ifinit" and verify
    if this was getting called
    or not..................
    cheers,
    mahesh

    "Sreekanth" <sreekanth@redlinenetworks.com>@freebsd.org on 29/05/2003
    21:01:29

    Sent by: owner-freebsd-net@freebsd.org

    To: "'Petri Helenius'" <pete@he.iki.fi>, "'Ruslan Ermilov'"
           <ru@freebsd.org>
    cc: freebsdnic@mailbox.cps.intel.com, freebsd-net@freebsd.org,
           akanwar@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).

    Sreekanth

    > -----Original Message-----
    > From: owner-freebsd-net@freebsd.org
    > [mailto:owner-freebsd-net@freebsd.org] On Behalf Of Petri Helenius
    > Sent: Thursday, May 29, 2003 4:39 AM
    > To: Ruslan Ermilov
    > Cc: freebsdnic@mailbox.cps.intel.com; akanwar@digitarchy.com;
    > freebsd-net@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
    > 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,
    > >
    > >
    >
    >
    > _______________________________________________
    > 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/freebsd-net
     To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"

    _______________________________________________
    freebsd-net@freebsd.org mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-net
    To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"

  • Next message: Scot Loach: "Socket option to get dst port"