Page 1 of 1
TCP flags usage
Posted: Mon Jul 31, 2006 12:34 am
by bravobritto
I don't know wether this topic make sense in this class of forum. Can anyone explain what you mean by TCP flags ? What is SYN, FIN, etc. ? How the firewall reacts to such TCP flags ? I'm using a hardware firewall NSF 6416. This firewall is loaded with Linux based OS. I ran fwmonitor to view TCP flags.
Regards
Britto

Posted: Mon Jul 31, 2006 12:38 am
by RobertGonzalez
Moved to Miscellaneous.
Posted: Mon Jul 31, 2006 7:49 am
by volka
each tcp/ip packet has a header and there's space for some flags - fields that can either be "flagged" or not (i.e. containing 1 or 0).
Two of these flags are called SYN and FIN - and there's another one called ACK.
You can find an example of what they are used for at
http://www.knowplace.org/pages/howtos/f ... erview.php
You might also find
http://www.knowplace.org/pages/howtos/f ... tables.php interesting.