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-boun...@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 <j...@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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