Ping problem with avaya VoIP phones

Answered Question
Mar 31st, 2007
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whenever i try to ping a avaya voip phone from a cisco device, i do not get a continuous response.


MS_VOICE_MEX_R01#ping 172.31.2.52 repeat 100


Type escape sequence to abort.

Sending 100, 100-byte ICMP Echos to 172.31.2.52, timeout is 2 seconds:

!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!

!.!!.!!.!!.!!.!!.!!.!!.!!.!!.!

Success rate is 67 percent (67/100), round-trip min/avg/max = 1/1/4 ms

MS_VOICE_MEX_R01#



But when i try to ping the same from a desktop i do get a continuous response.


Can anybody tell me the reason for this


Narayan

Correct Answer by ursa.minor about 10 years 1 month ago

Avaya IP Telephones implement an ICMP rate limiter. The Microsoft ping.exe command sends pings 1/second avoiding the rate limit. A Cisco 3825 sends pings at about 1/ms easily tiggering the rate limit.




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royalblues Sun, 04/01/2007 - 05:34
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Milan,


I don't think this is to prevent the DOS attack cos i am always able to ping the phone from any desktop continuously.


It only shows this absurd behaviour when i try to ping from a network device like a router/switch


Narayan


Correct Answer
ursa.minor Tue, 04/03/2007 - 08:00
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Avaya IP Telephones implement an ICMP rate limiter. The Microsoft ping.exe command sends pings 1/second avoiding the rate limit. A Cisco 3825 sends pings at about 1/ms easily tiggering the rate limit.




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