Re: why ng_bridge does not like DHCP?

From: Gleb Smirnoff (glebius_at_freebsd.org)
Date: 11/26/05

  • Next message: Gleb Smirnoff: "Re: Intel 82572EI" 
    Date: Sat, 26 Nov 2005 14:15:30 +0300
To: lasse.saranto@iki.fi

    On Thu, Nov 24, 2005 at 10:45:11AM +0200, Lasse Saranto wrote:
    L> I have the exactly same script (although I've got Realteks) as the original
    L> poster. If you run dhclient ngeth0 and use tcpdump on ngeth0, you see the
    L> dhcp discover packets going out, but no replys. But when you use tcpdump on
    L> the physical interface (as said mine's rl0), you'll find out that dhcp
    L> replys do come back. Ngeth0 just doesn't somehow notice them.
    L>
    L> I've tried with fbsd 5.3 and 5.4.

    The script is incorrect as I said. When you create a ng_eiface node
    it is unnamed. But automatically ng_ether node is created attached
    under ng_eiface and this ng_ether node is named with the name of
    the ngeth interface.

    Yes, this is very odd. I should fix ng_ether attaching to ng_eifaces.

    L> > l> n> [root@asd:~]# ifconfig xl0 up
    L> > l> n> [root@asd:~]# ngctl mkpeer . eiface hook ether
    L> > l> n> [root@asd:~]# ifconfig ngeth0 up
    L> > l> n> [root@asd:~]# ngctl mkpeer xl0: bridge lower link0
    L> > l> n> [root@asd:~]# ngctl name xl0:lower mybridge
    L> > l> n> [root@asd:~]# ngctl connect ngeth0: mybridge: lower link1
    L> > l> n> [root@asd:~]# ngctl connect ngeth0: mybridge: upper link2
                                           ^^^^^^^

    Here, in these two lines the ngeth0: node is NOT ng_eiface. You
    should use a script like this (not tested):

    /usr/sbin/ngctl -f- <<-SEQ
            mkpeer . eiface hook ether
            mkpeer xl0: bridge lower link0
            name xl0:lower mybridge
            connect .:hook mybridge: lower link1
            connect .:hook mybridge: upper link2
    SEQ

    ifconfig xl0 up
    ifconfig ngeth0 up

    L> > l> n> [root@asd:~]# ngctl msg xl0: setautosrc 0
    L> > l> n> [root@asd:~]# ngctl msg xl0: setpromisc 1
    L> > l> n> [root@asd:~]# ifconfig ngeth0 ether 00:12:12:12:12:12
    L> > l> n> [root@asd:~]# dhclient ngeth0 

    -- 
Totus tuus, Glebius.
GLEBIUS-RIPN GLEB-RIPE
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