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Date: Fri, 4 Oct 2002 17:06:44 +0300
From: Maxim Sobolev <sobomax@FreeBSD.ORG>
To: "Vladimir B.  Grebenschikov" <vova@sw.ru>
Cc: sumikawa@FreeBSD.ORG, freebsd-net@FreeBSD.ORG
Subject: Re: zebra interface flags problem on 4.7-RC2 (IFF_PROMISC)
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On Fri, Oct 04, 2002 at 05:51:46PM +0400, Vladimir B.  Grebenschikov wrote:
> 
> Hi
> 
> I have tried to install fresh zebra (from ports) on 4.7-RC2
> 
> have a problem - zebra turns on promiscuity mode on interface,
> it is completely unacceptable when interface connected to HUB (not
> switch) - router begins resend all packets.
> 
> # ifconfig fxp1
> fxp1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 193.125.143.129 netmask 0xffffff00 broadcast
> 193.125.143.255
>         ether 00:a0:c9:41:a3:a3
>         media: Ethernet autoselect (10baseT/UTP)
>         status: active
> # zebra -d
> 2002/10/04 16:33:42 ZEBRA: can't get ip6forwarding value
> # ifconfig fxp1
> fxp1: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 
> 1500
>         inet 193.125.143.129 netmask 0xffffff00 broadcast
> 193.125.143.255
>         ether 00:a0:c9:41:a3:a3
>         media: Ethernet autoselect (10baseT/UTP)
>         status: active
> 
> 
> Nothing special in zebra config, just installed 4.7-RC2, just upgraded
> zebra.
> 
> I am not sure is it Zebra-related or FreeBSD-related problem
> digging into zebra code do not show any abnormal interface flags
> installed.

This is probably a bug in zebra - I guess that it's doesn't clear
'struct ifreq' properly before SIOCSIFFLAGS ioctl(2).

-Maxim

> 
> May be problem related to following commit:
> 
> date: 2002/08/30 14:23:38;  author: sobomax;  state: Exp;  lines: +25 -4
> MFC: user-setable promisc mode. The code is slightly diffrent (and
> uglier)
> than in HEAD, because we have had to preserve kernel ABI, so that
> increasing
> if_flags to 32 bits was not an option.
> 
> 
> -- 
> Vladimir B. Grebenschikov
> vova@sw.ru, SWsoft, Inc.

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