tkdslr
join:2004-04-24
Pompano Beach, FL
 ·Speakeasy
| reply to Andromeda451
Re: UDP not TCP
said by Andromeda451  :
Isn't VOIP based on RTP wrapped up in a UDP wrapper? So a TCP ping test may not reflect the situation accurately?
SIP uses both UDP and TCP.. ports 5060 & 5061
It can use either protocol. It will use TCP when UDP fails.
see »www.vonage.com/corporate/press_n···_04_17_0
In a route looping scenario, after UDP attempts will fail, and the TCP fall back will also fail (in an identifiable pattern).
"Ping", generally uses an (ICMP) packet, which uses the IP layer of the TCP&UDP/IP protocol. |
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Andromeda451
join:2004-04-08
Queen Creek, AZ | reply to tkdslr
Isn't VOIP based on RTP wrapped up in a UDP wrapper? So a TCP ping test may not reflect the situation accurately? |
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tkdslr
join:2004-04-24
Pompano Beach, FL
·Speakeasy
| reply to chrisbmoore
Re: pay attention to the real issue!
"If these companies would simply spend as much time examining and improving their networks as they do blaming others for outages, the network would be flawless"
I agree.. A quick ping test of the GLBX/Vonage routers indicates a very familiar fault. Vonage/GBLX connections are suffering from Routing loops. 
Routing loops, where a packet goes bouncing back and forth between two routers until the TTL expires. When it gets into a loop, that same packet grabs 100x the bandwidth until the TTL expires. After that everything is normal for some period of time (30secs to a minute) until the senders TCP protocol times out and issues a retry.
If the routing loops get bad enough, then route flapping will also occur. |
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