Re: ideas for half-open sync flood fixs

[Brian Murrell <Brian_Murrell () bctel net>]

from the quill of peter () telescan com (Peter Cole) on scroll
<199609201650.MAA10156 () merit edu>
> fix 1.  Doesn't the network respond with ICMP message to the attacked
> host 
> telling it that the nonexistent host is unreachable.  The attacked host
> could 
> close a half open socket if it received a ICMP message with the
> corresponding 
> host address and socket port data.

Ideally.  A lot of firewalls silently drop packets which don't get past the
security policy to make port scanning take much longer than it would if
ICMP's were sent back.  No resets, no ICMP unreachable.

b.


--
Brian J. Murrell                                        Brian_Murrell () bctel net
BCTel Advanced Communications                                   brian () ilinx com
Vancouver, B.C.                                                brian () wimsey com
604 454 5279
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