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Date:      Thu, 06 Jun 2002 20:43:13 +0200
From:      Marko Zec <zec@tel.fer.hr>
To:        "Vladimir B. Grebenschikov" <vova@sw.ru>, freebsd-net@freebsd.org
Subject:   Re: [HELP] IPless VLAN interfaces
Message-ID:  <3CFFAD41.441C0E@tel.fer.hr>
References:  <20020606125126.3d44145c.c.prevotaux@hexanet.fr> <1023373804.470.20.camel@vbook.express.ru>  <3CFF7644.F4F5CC1@tel.fer.hr> <1023376206.470.40.camel@vbook.express.ru>

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"Vladimir B. Grebenschikov" wrote:

> χ Thu, 06.06.2002, Χ 18:48, Marko Zec ΞΑΠΙΣΑΜ:
>
> > > # ifconfig fxp0 1.1.1.1/24
> > > # ifconfig vlan0 1.1.1.1/32
> > > # ifconfig vlan1 1.1.1.1/32
> > > # ifconfig vlan2 1.1.1.1/32
> >
> > This will never work - you can't have the same IP address/mask on more than
> > one interface.
>
> Sure ? Do have try cut and paste my example into xterm ?
>
> vbook#/sys/i386/compile/VBOOK 142_> ifconfig -a
> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
>         inet 127.0.0.1 netmask 0xff000000
> fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 192.168.1.111 netmask 0xffffff00 broadcast 192.168.1.255
>         ether 08:00:46:04:31:b3
>         media: Ethernet autoselect (100baseTX)
>         status: active
> vbook#/sys/i386/compile/VBOOK 143_> ifconfig lo0 1.1.1.1/32 alias
> vbook#/sys/i386/compile/VBOOK 144_> ifconfig fxp0 1.1.1.1/32 alias
> vbook#/sys/i386/compile/VBOOK 145_> uname -a
> FreeBSD vbook.express.ru 5.0-CURRENT FreeBSD 5.0-CURRENT #3: Fri May 24
> 15:49:21 MSD 2002
> root@vbook.express.ru:/usr/obj/usr/local/src/sys/VBOOK  i386
> vbook#/sys/i386/compile/VBOOK 147_> ifconfig -a
> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
>         inet 127.0.0.1 netmask 0xff000000
>         inet 1.1.1.1 netmask 0xffffffff
> fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 192.168.1.111 netmask 0xffffff00 broadcast 192.168.1.255
>         inet 1.1.1.1 netmask 0xffffffff broadcast 1.1.1.1
>         ether 08:00:46:04:31:b3
>         media: Ethernet autoselect (100baseTX)
>         status: active
>
> Both addresses are work:
>
> vbook#/sys/i386/compile/VBOOK 153_> ping -R -S 1.1.1.1 127.0.0.1
> PING 127.0.0.1 (127.0.0.1) from 1.1.1.1: 56 data bytes
> 64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.167 ms
> RR:     localhost (127.0.0.1)
>         1.1.1.1
> 64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.150 ms        (same
> route)
> vbook#/sys/i386/compile/VBOOK 154_> ping -n -R -S 1.1.1.1 192.168.1.109
> PING 192.168.1.109 (192.168.1.109) from 1.1.1.1: 56 data bytes
> 64 bytes from 192.168.1.109: icmp_seq=0 ttl=64 time=1.836 ms
> RR:     192.168.1.109
>         1.1.1.1
> 64 bytes from 192.168.1.109: icmp_seq=1 ttl=64 time=1.600 ms    (same
> route)
>
> (use loopback not best way to do this, but you can try any interface)
>
> > What OS are you running?
>
> # uname -a
> FreeBSD vbook.express.ru 5.0-CURRENT FreeBSD 5.0-CURRENT #3: Fri May 24
> 15:49:21 MSD 2002
> root@vbook.express.ru:/usr/obj/usr/local/src/sys/VBOOK  i386
>
> Same setup works well on 4-STABLE

In your original post, you were suggesting to put the same IP/mask on different
"real" interfaces, not loopback. Could you pls. try to create a couple of vlan
interfaces (ifconfig vlan0 create...), than configure them with the same IP
addresses/masks as you suggested earlier, and show us the results of this
procedure? On my 4.6-RC system, such thing just don't work, thanks God.

Marko


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