[ntp:questions] Re: server's address in ntp payload?
mayer at gis.net
Thu Nov 24 03:04:14 UTC 2005
Brian Utterback wrote:
> Danny Mayer wrote:
>> Brian Utterback wrote:
>>> If that is a layering violation, then why do you need to know both the
>>> source and destination address of each NTP packet to authenticate it?
>> I refer you to the autokey protocol.
> Circular reasoning again. This is a "what is" argument. Couldn't the
> autokey protocol be redesigned not to rely on the IP addresses?
I didn't design the autokey protocol and have not reviewed it. However
from what I understand the IP addresses are used as seeds for the
authentication codes and ensure that it only work between two specific
endpoints so MIM attacks are virtually impossible.
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