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?
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