From: Chris Kuethe (chris.kuethe@gmail.com)
Date: Wed Dec 22 2004 - 12:48:57 EST
On Wed, 22 Dec 2004 09:04:16 -0800, John Forristel (SunGard-Chico)
<John.Forristel@sungardbi-tech.com> wrote:
> GRE and ESP are protocols, not ports, so they are transported through on
> configured ports. In Cisco, you permit gre and esp through for the VPN
> traffic.
No, they are not transported on configured ports. They are transported
via IP, and your IP stack is informed of this by the 10th byte of the
IP header. In tcpdump parlance:
(ip[9] = 47) GRE
(ip[9] = 50) ESP
-- GDB has a 'break' feature; why doesn't it have 'fix' too?
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