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Date:      Fri, 10 Jul 1998 10:30:32 -0500 (CDT)
From:      "Paul T. Root" <proot@horton.iaces.com>
To:        tinguely@plains.NoDak.edu (Mark Tinguely)
Cc:        questions@FreeBSD.ORG
Subject:   Re: tcpdump
Message-ID:  <199807101530.KAA11520@horton.iaces.com>
In-Reply-To: <199807101455.JAA13003@plains.NoDak.edu> from Mark Tinguely at "Jul 10, 98 09:55:09 am"

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In a previous message, Mark Tinguely said:
> 
> >  	tcpdump gives me errors that it can't find /dev/bpf[0-4] as I 
> >  add them one at a time. After adding bpf4 (which I know shouldn't exist),
> >  I get bpf4: device not configured.
> >
> 
> sounds like you have BPFilters in the kernel, and you have a device that
> supports a BPFilter. I assume you are running as root or have made the
> /dev/bpf[0-3] sufficiently readable by group or by world. are their any
> tcpdumps running in the background tying up the bpfs?

Yep, as root. None running in the background.



> >  	It's running 2.2.6-RELEASE, and the only network I have is lo0, de0
> >  and tun0. I'm running ppp -alias and am trying to get the Win98 machine to
> >  go through, but it's not happening, hence tcpdump. 
> >
> >  	I did test ppp -alias with my laptop, when I was running 2.2.5-Release.
> >  I also remember tcpdump working on 2.2.5. I also have tcpdump working fine on
> >  machine's here at work (with fxp and vx devices).
> 
> did you set the variable in /etc/rc.conf:
> 
> gateway_enable="YES"
> 
> or from the command line:
> 
> sysctl -w net.inet.ip.forwarding=1
> 
> (you can check the value from the command line by:
> 
> sysctl net.inet.ip.forwarding
> 
> it should reply:
> 
> net.inet.ip.forwarding: 0
> )


Ah, I'm not sure I did this.  But that's not going to affect tcpdump,
is it?




> did you set the gateway on the Window9x machine to the IP of the
> FreeBSD machine and also set the netmask correctly?

Yes, they can talk to each other.


> are you using the -alias command on the ppp command line?

yes.


> if you have more problems with tcpdump or the net conection, just yell.

Thanks.

-- 
First ponder, then dare.                --Helmuth von Moltke

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