[15857] in North American Network Operators' Group
Re: IP over SONET considered harmful?
daemon@ATHENA.MIT.EDU (Sean M. Doran)
Tue Mar 24 08:47:56 1998
From: "Sean M. Doran" <smd@clock.org>
To: ferguson@cisco.com, nshen@mci.net
Cc: alan@globalcenter.net, nanog@merit.edu, yakov@cisco.com
Date: Tue, 24 Mar 1998 05:20:28 -0800
| A more flexible 'knob' would be cool, something like combining the 'cos'
| bits in the labels with the decision to decremening or not. This will give
| the management station the power to 'trace' even the regular trace packet
| can't do.
No, no, no, no, no. You are confusing TTL expiration with
"visibility".
You have a trade off between size of forwarding loop and
TTL decrement. The longer it takes to decrement a TTL to 0
in a forwarding loop, the worse the loop's effects will be.
What you want -- and I think you are very strange for wanting it,
by the way, but I will supply you a solution anyway -- is a knob
that modifies the ICMP ttl exceeded message that is sent back
to the source.
Sean.
