Ethereal-users: Re: [Ethereal-users] IP within IP

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From: Guy Harris <guy@xxxxxxxxxxxx>
Date: Wed, 29 Oct 2003 03:00:17 -0800
On Tue, Oct 28, 2003 at 06:36:51PM +0000, bejay wrote:
> Does Ethereal or the engine dissect IP within IP?

Yes, in some cases.

> if so does anybody know what the identifier is that tells
> the receiver to expect another IP layer?

A value of 4 in the IP protocol/next header field (RFC 2003, "IP
Encapsulation within IP").

If by "IP" you also mean IPv6, there's also a value of 41 in the IP
protocol/next header field, which is IPv6 inside IP.