Strange PATH MTU Traffic

["Joshua Berry" <jberry () PENSON COM>]

I am getting this alert: ICMP PATH MTU denial of service

I have never had this alert previous to this weekend, and have received
40,000 within the last 8 hours.  Some of this traffic appears to be
encrypted, the rest of it is hitting our domain controllers and contains
schema information.

I know Microsoft does some screwy stuff but I have never seen schema
information transmitted in an ICMP packet, much less a path mtu
discovery packet.

Anyone else seen this type of traffic?
 
Josh Berry | CISSP GCIA 
Information Security
214-765-1296
 
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