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Date: Tue, 27 Feb 2001 10:49:27 -0800
From: Julian Elischer <julian@elischer.org>
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To: Satyajeet Seth <sseth@sasken.com>
Cc: net@freebsd.org
Subject: Re: Problem in configuring netgraph
References: <Pine.GSO.4.30.0102272235130.13910-100000@suns3.sasi.com>
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Satyajeet Seth wrote:
> 
> Hi
> 
> I tried the example at:
> http://www.freebsd.org/cgi/cvsweb.cgi/src/share/man/man4/ng_bpf.4
> 
> When I type:
> 
> tcpdump -ddd ether dest xx:xx:xx:xx:xx:xx
> 
> in a telnet session the command gave the raw BPF instructions, as
> expected.
> 
> However, at the system console the same command gave the message:
> 
> fxp0: promiscuous mode enabled
> tcpdump: syntax error
> xp0: promiscuous mode disabled
> 
> Could you suggest what could be wrong?
> 
> I also tried the following:
> 
> 1. reboot
> 2. ping -f <some machine in lan> &
> 3. nghook -a fxp0: lower
> Now I get identical packets.
> 
> 4. ngctl mkpeer fxp0: bpf divert bhook
> 
> 5. ngctl name fxp0:divert bpf0
> 
> 6.  ngctl msg bpf0: setprogram { thisHook="bhook" ifMatch="hook2"
>     ifNotMatch="hook1" bpf_prog_len=1 bpf_prog=[ { code=6 } ] }
> 
>     Now all the packets are sent to hook1.

> 7. nghook -a  bpf0: hook1
>     gives packets differing from point 3.

how different?

> 
> 8. ping to any machine on the lan does not work.
> By default the upper and lower hooks of fxp0 are effectively connected. Our setup also does the
> same.
> 
> Could you suggest why the ping does not work?

because the incoming packets are still being diverted to the bpf node.

> 
> Thanks
> Satya
> 
-- 
      __--_|\  Julian Elischer
     /       \ julian@elischer.org
    (   OZ    ) World tour 2000-2001
---> X_.---._/  
            v

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