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Welcome to Cisco Support Community. We would love to have your feedback.

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Bronze

restrictive sites

Hii,

guys can i block yahoo messenger chat on my router for security purpose??I tried to do so with the default ports and the ip's but it seems each time it comes up with some different subnets.I want to implement this using router cli only and not by any level 7 s/w.

1 REPLY
Cisco Employee

Re: restrictive sites

yahoo is programmed to use search for other ports if the default is blocked, ports such

as 20, 23, 80, 5050 ..... depending on the service and the ports available. You can block the packets that carries the destination of yahoo messenger servers.

Here is more information about ports for messenger:

Yahoo! Messenger

5050 (outbound TCP)

5101 (inbound TCP)

5100 for webcam (TCP)

5001 for voice (TCP)

For voice: cs1.yahoo.com, cs2.yahoo.com, and cs3.yahoo.com

Yahoo will search ports 5050, 80, 20, 21, 25, 37 and 119 if 5050 is blocked

Server IP addresses

128.11.69.23

204.71.177.35

204.71.200.36

204.71.200.37

204.71.200.54

204.71.200.55

204.71.200.56

204.71.200.57

204.71.201.100

204.71.201.134

204.71.201.141

204.71.202.58

204.71.202.59

204.71.202.119

204.71.203.47

216.115.105.57

216.115.107.63

216.115.107.64

216.115.107.65

216.115.107.66

csXX.msg.yahoo.com Series

216.136.175.143-145

216.136.225.83-48

216.136.225.12

csXX.msg.sc5.yahoo.com Series

216.136.226.209-210

216.136.227.166-167

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