Ask the Expert

What does "TTL expired in transit" mean?

We have a lease line between two sites. When the line is down and I ping to the router on the other site, we normally get the answer "Request timed out," but now we get the answer "TTL expired in transit." What does it mean?


    Requires Free Membership to View

"Request timed out" error occurs when the computer you're pinging from doesn't ever get a response back. So, it would be symptomatic of a leased line that is simply down and can't reach the Internet. The "TTL expired in transit" error will only show up if a router that is forwarding the traffic sends an error message back to the computer you're pinging from.

TTL (Time To Live) is a number that is used to track the number of hops or routers a particular packet crosses. If a packet crosses too many routers, an error is returned to the computer that sent the packet. This is to prevent routing loops where a packet is forwarded between two or more routers indefinitely. In short, it means you have a Layer 3 network problem instead of a Layer 1 network problem, and you should call whoever is responsible for your network infrastructure.

This was first published in September 2002

There are Comments. Add yours.

TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to: