Ttl ??

[LordOfLA]

heh the problem with that theory is that if you bump into a carrier using MPLS configured routers, you could hop through 10,000 and only see 2....

so its not a reliable source of info. You wont see the coreix routers at all because of that protocol on an inbound trace, yet your packet jumps through either one or both, depening whic carrier you com in via and which part of our network you want to get to.

 

[dreamworks]

.. great .. now I feel like I am lost in the big ocean .. or big jungle ..

 

[gonaads]

My head hurts.


Time for bed.

*takes another drink from Pepsi*



I SAID, TIME FOR BED!


*takes yet another drink of Pepsi*


This gonna take a while.

 

[DwarfData]

from http://www.faqs.org/rfcs/rfc3682.html

Sorry guys. I guess I'm not explaining things the way I mean to.

By maximum value, I meant the maximum number of hops we were allowing. As pointed out 255 is the maximum value we can actually use. I was using arbitary figures to explain the point.

 

[Electronic Punk]

ttl can also give us a good indication of what the device is when you ping it

 

[gonaads]

.. great .. now I feel like I am lost in the big ocean .. or big jungle ..

Yeah, I'm in the other boat a few meters away. Or was that a tree?

 

[DwarfData]

It was definatly a tree

 

[Geffy]

yeah, some routers dont decrement the ttl as it goes through them, this is often done on some edge routers so that the packet can still bounce around a fair bit once it is inside the routers network.

edge routers being the routers on the edge of a network, they interface with the network itself and other edge routers on other networks. IE your ISP will have these to talk to other routers so you can send packets around the world. Exciting huh

 

[dreamworks]

ok .. slowly sipping in .. but still unclear. so to a network guy .. how important is TTL as a whole? and in what situation is it considered important?

the reason why i asked is because i am trying to hook up 2 sites on different location and i have 2 options:-

1) option 1 - leased line which is currectly in used and the TTL between both the sites is around 250 - 350.

2) option 2 - satelite connection which is being considered but was told the TTL would be around 750 - 1000 instead although the bandwidth is higher.

so thats the reason why i asked this question

 

[Zedric]

It was definatly a tree

Spanning tree?

 

[Zedric]

ok .. slowly sipping in .. but still unclear. so to a network guy .. how important is TTL as a whole? and in what situation is it considered important?

It's only important to prevent overload if loops form in a network (which is bad on its own).

the reason why i asked is because i am trying to hook up 2 sites on different location and i have 2 options:-

1) option 1 - leased line which is currectly in used and the TTL between both the sites is around 250 - 350.

2) option 2 - satelite connection which is being considered but was told the TTL would be around 750 - 1000 instead although the bandwidth is higher.

so thats the reason why i asked this question

Are you sure we're really talking TTL here? That's awfully high numbers. Impossibly high. Are you sure you're not referring to ping (turnaround time)? That's usually higher on a satellite connection since it takes time for the signal to travel out into space and back. 250-350 (milliseconds) on a regular land connection is still high (a packets usually gets around the globe in that time).

 

[gonaads]

Also wasn't it stated before that the TTL default max is 255, be it by app or OS?

 

[dreamworks]

Hmmm ... ok maybe its not TTL than. I have to re-check and confirm again. But thanks very much for the information guys!!

Really appreciate your assistance. Cheers!

 

[Zedric]

Hmmm ... ok maybe its not TTL than. I have to re-check and confirm again. But thanks very much for the information guys!!

Really appreciate your assistance. Cheers!

At least you learned something, although it may not have been what you were looking for!