Problems with gif tunnels

[Greg 'groggy' Lehey]

On Thursday,  9 June 2005 at  1:46:00 +0200, Jeremie Le Hen wrote:
> Greg,
>
>> My understanding is that GRE is to IP as PPP is to SLIP: it allows
>> multiple protocols to be encapsulated.  I've done some tracing with
>> Ethereal, and the only difference is a four-byte header in front of
>> the payload for GRE; in an IP tunnel, it's simply missing.  I've
>> written this up in my diary
>> (http://www.lemis.com/grog/diary-jun2005.html#8), along with the
>> traces.
>
> yes it's usually a simple four-byte header when doing a simple tunnel.
> But from what I have read [1] and according to what Giorgos said,
> it seems it can be a lot more longer, depending on the value of the
> five first bits of the GRE header.

Ah, that seems reasonable.  

Greg
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