Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.


TTL and Intermediary network devices

TTL and Intermediary network devices

thread581-759360: analyse ping results
Hey Ye'all,

I'm currently taking ccna classes to get prepaired for certification. Today we were discussing the TTL topic and we wondered at what end of a (let's say) router the ttl is decremented, at the incoming interface, the routerprocess or it's outgoing interface? just for the sake of having something to talk about over a cup of coffee...

RE: TTL and Intermediary network devices

"When a router forwards a packet, it MUST reduce the TTL by at least one. If it holds a packet for more than one second, it MAY decrement the TTL by one for each second. This way, Time-to-Live is used as a time count."

(Emphasis mine)

(that line is towards the bottom of the page in the paragraph titled "Time-to-Live: Does it measure time or hops?"

"You don't know what you got, till its gone..
80's hair band Cinderella or ode to data backups???"

RE: TTL and Intermediary network devices

Thanks DrBOb, The 'time'-thing hadn't come up but will surely be discussed. IT Gives a new dimension to the topic in class.

RE: TTL and Intermediary network devices

No Problem DrSic,
I got a Bachelors from SIU here in IL and I don't remember ever going over the Time aspect of it, only the Hops.  Maybe I wasn't paying attention that day...........

If you get stumped or looking for a good discussion topic, just bounce a post here as there are many good minds here willing to help.

"You don't know what you got, till its gone..
80's hair band Cinderella or ode to data backups???"

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members!


Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close