http://www.secdev.org/conf/skype_BHEU06.handout.pdf holds some nice information about the "evil" skype. Detailed information on the packets start at page 9.
Post by Holger Bauer-----Original Message-----
From: Holger Bauer
Sent: Monday, March 20, 2006 5:09 PM
Subject: RE: [pfSense Support] Skype traffic priorization
Skype is a bitch if it comes to shaping as it uses any
available port IF available and each endpoint can have random
incoming connection ports (the incoming port is
configurable): http://www.skype.com/help/guides/firewall.html
So there is nor real way to set priority for that kind of
traffic based on ports (and it's hard to block that kind of
traffic too because of that without using a proxy). I'm not
sure if it places special TOS fields in the header but that
would be your only way then. Try to ethereal the connection
and check which flags are set and if they are different from
other traffic like browsing, ftp and so on. Then use the flag
options for the rules.
You also might try to just run the traffic shaper and assign
"prioritize voip" "default low delay" "32 kbit/s" (skype
usually uses that amount of traffic). Then view your queues
at status>queues and do a call. If you see traffic in the
voipqueue you are done as this means that skype sets "low
delay" flags.
Holger
-----Original Message-----
From: Pedro Paulo de Magalhaes Oliveira Junior
Sent: Monday, March 20, 2006 4:48 PM
Subject: [pfSense Support] Skype traffic priorization
Does anybody know how to priorize Skype traffic in pfsense QOS?
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