ICMP type-3/code-3

[Lance Spitzner]

My DNS servers are getting alot of ICMP type-3/code-3
traffic.  This is Destination unreachable/port unreachable.

  3     Destination Unreachable                  [RFC792]

	  Codes
		0  Net Unreachable
		1  Host Unreachable
		2  Protocol Unreachable
		3  Port Unreachable

This happens at random times, but in large bursts (5-10 +
packets from specific hosts).

Why are my DNS servers (Bind 8.1.2) receving these packets?

Thanks!

Lance Spitzner
http://www.enteract.com/~lspitz
Internetworking & Security Engineer
Dimension Enterprises Inc