Hi Joe, A quick Google search renders: Cisco SSG TCP Redirect http://www.cisco.com/en/US/products/hw/routers/ps133/products_configuration_... ...but it apparently runs on tcp/8094, so no idea here. 4662 sounds like eDonkey2000, a P2P application, but... http://www.iana.org/assignments/port-numbers says: oms 4662/tcp OrbitNet Message Service oms 4662/udp OrbitNet Message Service # Roy Davies <rdavies@daq.net> August 2005 - ferg -- Joe Shen <joe_hznm@yahoo.com.sg> wrote: Hi, Using netflow based monitor tool, I noticed there is a lot of traffic on 8094/UDP and 4662/TCP( both exceed 1Gbps, and exist all the time) What application use that port? Is there any P2P application use UDP as transportation protocol? thanks in advance. Joe -- "Fergie", a.k.a. Paul Ferguson Engineering Architecture for the Internet fergdawg@netzero.net or fergdawg@sbcglobal.net ferg's tech blog: http://fergdawg.blogspot.com/