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Re: key change for TCP-MD5
- From: Iljitsch van Beijnum
- Date: Mon Jun 19 09:46:02 2006
On 19-jun-2006, at 14:32, Steven M. Bellovin wrote:
I just submitted an I-D on TCP-MD5 key change. Until it shows up
official repository, see
Here's the abstract:
The TCP-MD5 option is most commonly used to secure
BGP sessions between routers. However, changing
the long-term key is difficult, since the change
needs to be synchronized between different
We describe single-ended strategies that will permit
(mostly) unsynchronized key changes.
I wonder how long that policy will hold. (-:
First of all, I applaud this effort.
There doesn't really seem to be a way to introduce a new key other
than to just to agree on a time. I'm not sure this is good enough.
Wouldn't it be better to exchange some kind of "time to change keys"
message? This could simply be a new type of BGP message that hold a
key ID. Obviously the capability to send and receive these messages
must be negotiated when the session is created, but still, I think
the extra complexity is worth it because it allows for much more
And is NANOG now officially an IETF working group...?