Date: Wed, 22 May 2013 08:48:36 -0700 From: Michael Sierchio <kudzu@tenebras.com> To: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: GRE and BPF Message-ID: <CAHu1Y73NkeeiywK7FkpXa68dz6_Hng_0dtbSZ3USt0xb%2BG2eog@mail.gmail.com> In-Reply-To: <20130522153905.GP887@wiggum> References: <20130522153905.GP887@wiggum>
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On Wed, May 22, 2013 at 8:39 AM, Brian Hechinger <wonko@4amlunch.net> wrote: > Hello all, > > I've been having some trouble with a GRE tunnel. Specifically with > non-IP traffic (DECnet, in this case) and BPF. > > I can see the GRE packets containing the DECnet packets coming over the > physical interface but when I do a tcpdump of bge0 I never see them. > > This is an issue because the program I want to use will be using pcap to > pull packets off of the bge0 interface. > > I can get IP packets off of the bge0 interface with tcpdump, however. > > Is this just never going to work or am I missing something here? > > What does ifconfig report for the MTU of the gre interface? Does it match the Cisco? Is grekey set? Do you have a route to the network that is encapsulated on the other side? is net.inet.ip.forwarding set to 1? - M
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