[asterisk-users] tcpdum

[Jeff LaCoursiere]

No.  TTL in the header is about hop traversal.  Each IP router that 
forwards the packet will reduce this number in the live packet until it 
reaches zero, when it will be dropped.  I believe this is to eliminate 
route loops creating packet storms.

FWIW this is how traceroute works - it sends out packets with continually 
increasing TTLs and the router that drops the packet will send back a 
notification, so you can "trace" each hop...

What is it you are trying to do or measure?

j

On Mon, 15 Dec 2008, michel freiha wrote:

> 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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>