From: istong@stong.org
Date: Thu Nov 13 2003 - 09:22:42 GMT-3
Hi,
Assuming that Cisco follows the standard - here is some
information.
A GRE packet is composed of a header in which a type
field specifies
the encapsulated protocol (ARP, IP, IPX, etc.). See
RFC2784 for
details about the encapsulation.
A packet tunneled with a GRE encapsulation has the
following format:
the delivery header is an IP header whose destination is
the tunnel
end-point (FBIP), followed by a GRE header specifying the
link-layer
type of the unidirectional link.
----------------------------------------
| IP delivery header |
| destination addr = FBIP |
| IP proto = GRE (47) |
----------------------------------------
| GRE Header |
| type = MAC type of the UDL |
----------------------------------------
| Payload packet |
| MAC packet |
----------------------------------------
Thanks,
Ian
www.realccie.com
> sorry for the of-topic but may be someone can help
> me find more about GRE keepalive.
> i have linux that can work with GRE tunnel. this days i
> need this linux to support GRE keepavlive. i cant find any
> RFC or Cisco document that have details about the
> keepalive packet/header format, can any one knows where
> can i find more about this issue. i know the Cisco docs
> about how to configure the GRE keepavlive but in this docs
> no packet format is presented.
>
> TIA
>
> Roi
>
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