Date: Wed, 21 Jul 1999 09:09:02 -0700 (PDT) From: Divya Mehra <divya@nttmcl.com> To: Brian Somers <brian@Awfulhak.org> Cc: freebsd-questions@FreeBSD.ORG, divya@nttmcl.com Subject: Re: bpf and user PPP ( tun0 ) Message-ID: <Pine.GSO.3.95LJ1.1b4.990721084743.8158A-100000@alicia.nttmcl.com> In-Reply-To: <199907202103.WAA41636@dev.lan.awfulhak.org>
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I invoked the BIOSETIF command before actually reading the the ppp
packets.
1) For tun0 i.e user PPP it returns error "Network down".
Only after PPP is up can I proceed further ( IPCP phase up). So I could
not capture any PPP packets. Is my approach correct ?
BIOGCGDLT returns DLT_NULL . Is that correct ? should it not be
returning DLT_PPP ?
2) For ppp0 what should BIOGDLT be returning ?
thanks,
Divya
**************************************************************************
Divyashikha Mehra NTT Multimedia Communications Laboratories
Computer Systems Designer 250 Cambridge Avenue, Suite 205
650-833-3655 (Voice) Palo Alto, CA 940040, USA.
mailto : divya@nttmcl.com
***************************************************************************
On Tue, 20 Jul 1999, Brian Somers wrote:
> > Hi,
> >
> > Can anyone tell me if bpf support user ppp packet ( tun 0 device) or it
> > can be used only for kernel ppp ( ppp0 device ) ?
>
> Yes.
>
> > If it can support user ppp then what value should BIOSETIF be returning
> > when bpf is to be used for reading ppp packets?
>
> >From the bpf man page:
>
> BIOCSETIF (struct ifreq) Sets the hardware interface associate with
> the file. This command must be performed before any pack-
> ets can be read. The device is indicated by name using
> the ifr_name field of the ifreq structure. Additionally,
> performs the actions of BIOCFLUSH.
>
> > Thanks,
> > Divya
> >
> > **************************************************************************
> > Divyashikha Mehra NTT Multimedia Communications Laboratories
> > Computer Systems Designer 250 Cambridge Avenue, Suite 205
> > 650-833-3655 (Voice) Palo Alto, CA 940040, USA.
> > mailto : divya@nttmcl.com
> > ***************************************************************************
>
> --
> Brian <brian@Awfulhak.org> <brian@FreeBSD.org>
> <http://www.Awfulhak.org>; <brian@OpenBSD.org>
> Don't _EVER_ lose your sense of humour ! <brian@FreeBSD.org.uk>
>
>
>
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