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basic questions
- shathriyan
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16 years 10 months ago #25202
by shathriyan
shathriyan
Infrastructure Manager
basic questions was created by shathriyan
* what is the use of TTL in a ip packet ?
shathriyan
Infrastructure Manager
16 years 10 months ago #25204
by TheBishop
Replied by TheBishop on topic Re: basic questions
It defines the number of router hops the packet is allowed to make before it gets discarded. At each hop the counter gets lowered by one until the final router notes that the counts are all gone and discards the packet. The mecanism is there to prevent packets rattling aroung the routing infrastructure/internet forever when for some reason (such as a routing loop for example) they don't get delivered to a destination.
16 years 10 months ago #25221
by KiLLaBeE
Replied by KiLLaBeE on topic Re: basic questions
My Server 2003 book also says that the TTL will decrease by 1 if the packet takes longer than 1 second to reach it's next router. Is this true? I've never heard of that but I suppose it would make sense.
16 years 10 months ago #25227
by TheBishop
Replied by TheBishop on topic Re: basic questions
I've never heard of that, can any one else clarify?
16 years 10 months ago #25233
by toddwoo
Replied by toddwoo on topic Re: basic questions
That doesn't sound right to me. How would router 2 know what time the packet left router 1? Unless I'm missing something about regular data packets having timestamps in them...
- skepticals
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16 years 10 months ago #25237
by skepticals
Replied by skepticals on topic Re: basic questions
TCP and UDP packets do not have timestamps in them. I know RTP does. Or at least that seems the reason VoIP uses RTP over UPD because it requires a timestamp.
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