Determining port numbers for redirected traffic

Descriptions of port settings

The following table shows, for each protocol supported for transparent proxying, the recommended port numbers to use for transparent redirection. You must open these ports on the switch or router and on the appliance.

Protocol	Required port setting	Comments	Default setting
DNS	53	This port number is not configurable.	53
FTP	21	This port number is not configurable.	21
HTTP	80	You can set multiple HTTP proxy ports. Therefore, you can set a proxy port to 80 for transparency, even if you are already running the NetCache service on port 3128.	3128
NNTP	119	None.	119
MMS	1755	This port number is not configurable.	1755
RTSP	554	If you use WCCP for transparent proxying and redirect RTSP traffic to a port number greater than 1024, random non-RTSP traffic is sent to that port. This random traffic can cause network problems.	554
RTCP	2001 (recommended)	You must set an RTCP port if you are using QuickTime for streaming. RTCP allows quality-of-service feedback information to be exchanged between QuickTime clients and the streaming media cache through UDP. This port must be an odd number.	2001