Firewall Wizards mailing list archives
Re: PIX responding with SYN+ACK to SYN+ACK probe sent on open port
From: Martin Mačok <martin.macok () underground cz>
Date: Wed, 12 Jan 2005 15:17:20 +0100
On Wed, Jan 12, 2005 at 02:52:59PM +0100, stephane nasdrovisky wrote:
In general, an implementation must be conservative in its sending behavior, and liberal in its receiving behavior.
Are we still talking about firewalls? ;-) Related reading: http://lists.megacity.org/pipermail/rfci-discuss/2004-September/002758.html IMO, ignoring ACK flag in SYN packet is against TCP spec, not just "liberal" acceptance in the mean of "not object to technical errors where the meaning is still clear" (the same paragraph you are quoting). It also poses some security risks, anyway... Martin Mačok ICT Security Consultant _______________________________________________ firewall-wizards mailing list firewall-wizards () honor icsalabs com http://honor.icsalabs.com/mailman/listinfo/firewall-wizards
Current thread:
- PIX responding with SYN+ACK to SYN+ACK probe sent on open port Martin Mačok (Jan 11)
- Re: PIX responding with SYN+ACK to SYN+ACK probe sent on open port L Cubed (Jan 11)
- Re: PIX responding with SYN+ACK to SYN+ACK probe sent on open port Martin Mačok (Jan 14)
- Re: PIX responding with SYN+ACK to SYN+ACK probe sent on open port L Cubed (Jan 19)
- Re: PIX responding with SYN+ACK to SYN+ACK probe sent on open port Martin Mačok (Jan 14)
- Re: PIX responding with SYN+ACK to SYN+ACK probe sent on open port L Cubed (Jan 11)
- <Possible follow-ups>
- RE: PIX responding with SYN+ACK to SYN+ACK probe sent on open port Smith, Aaron (Jan 11)
- Re: PIX responding with SYN+ACK to SYN+ACK probe sent on open port stephane nasdrovisky (Jan 14)
- Re: PIX responding with SYN+ACK to SYN+ACK probe sent on open port Martin Mačok (Jan 14)
- Message not available
- Re: PIX responding with SYN+ACK to SYN+ACK probe sent on open port Martin Mačok (Jan 14)
- Re: PIX responding with SYN+ACK to SYN+ACK probe sent on open port Chuck Swiger (Jan 19)
- Re: PIX responding with SYN+ACK to SYN+ACK probe sent on open port stephane nasdrovisky (Jan 14)
- Re: PIX responding with SYN+ACK to SYN+ACK probe sent on open port L Cubed (Jan 11)