[asterisk-users] tcpdum

[Roland Roland]

Hi Michel,

how's beirut's weather with ya!

anyway, TTL stands for TIME To LIVE.
it's encapsulated on layer three of the OSI layer to each packet going out that specific interface.
by default routers has a 16 TTL that means each time the designated packet reaches a router (gets decapsulated) it gets a -1...
this helps in preventing loops which would eventually lead to congestion.

now latency wise, for VOIP to operate correctly it needs a latency of under 200 ms. (I currently have a microwave link , and unfortunately im not getting that a latency less than 280 to my SIP provider)

if your asterisk server is hosted online, you could simply traceroute it and check the highest latency, point. and depending on where that bottle neck would be, youll troubleshoot from there..
mine were on my ISP's international link, after having a meeting with my account manager, I got my link routed through a different international path which drastically decreased my latency.

now on a different approach, you absolutly have to talk to your ISP/network administrator to provide you QOS for that specific IP whether it's public or private.
depending on your network's traffic QOS would surely help with no doubt.. this would decrease latency as well 

hope I've shed some light about this, if not well the more knowledge the betteR

best,
Roland


From: michel freiha 
Sent: Monday, December 15, 2008 10:50 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion 
Cc: asterisk-users-bounces at lists.digium.com 
Subject: Re: [asterisk-users] tcpdum


Dear Sir,

There is no relation between TTL and the latency on asterisk server?

Regards


On Mon, Dec 15, 2008 at 10:39 PM, Jeff LaCoursiere <jeff at jeff.net> wrote:


  TTL is part of the UDP header (Time To Live).  It isn't really about the
  voice at all.

  Length 345 is the number of bytes in the packet.

  j

  On Mon, 15 Dec 2008, michel freiha wrote:

  > *Dear All,

  > I run the below tcp dump on my asterisk server
  >
  > tcpdump -i eth0 -n -s0 -v udp port 5060
  >
  > I got the following result
  >
  > 20:29:48.596867 IP (tos 0x10, ttl  64, id 0, offset 0, flags [DF], proto 17,
  > length: 373) SIP_PROXY_IP.5060 > Asterisk_IP.5060: UDP, length 345
  >
  > What i need to know please what TTL means specifically and what is the best
  > value og TTL and what is the lengh vale mean
  >

  > Regards*
  >

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