From: paul cosgrove (paul.cosgrove@gmail.com)
Date: Thu Dec 18 2008 - 16:33:20 ARST
Hi John,
Any form of encapsulation will reduce the maximum size of your payload
packets, since you only have a limited interface MTU.
Using GRE gives you more flexibility in that it allows you to tunnel
protocols other than just IP, and/or tunnel across non IP networks. It
also has other nice features such as keys and keepalives (though I think
keepalives may be cisco proprietary).
IP-in-IP is more restricted in what it can do, but being more streamlined it
can use smaller headers and thus supports a larger MTU for your payload
packets.
Paul.
On Thu, Dec 18, 2008 at 4:34 PM, john edward <john4edward@gmail.com> wrote:
> Hi Gents.
>
> Please Whats the advantage of implementing IP-in-IP tunneling versus GRE
> tunneling? Does IP-in-IP eliminate the need to adjust the ip tcp mss-adjust
> settings on the routers and also MTU?
>
> I look forward to your responses.
>
> Thanks
>
> John
>
>
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