default TTL value

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TTL is the maximum number of network jumps that a packet can take before expiring. Even in an absolute worst case scenario it will rarely take more than 25 jumps to go from A to B. However, it's possible for a cyclic route to be formed, so it's necessary that there be a way to terminate a packet such that it doesn't get tossed around forever and ever. The TTL value is decreased by 1 every time it is routed from one network to another. If it hits zero, attempting to route it again will result in an ICMP error which will be sent back to the sender.
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Pinhedd

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Aug 7, 2007
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TTL is the maximum number of network jumps that a packet can take before expiring. Even in an absolute worst case scenario it will rarely take more than 25 jumps to go from A to B. However, it's possible for a cyclic route to be formed, so it's necessary that there be a way to terminate a packet such that it doesn't get tossed around forever and ever. The TTL value is decreased by 1 every time it is routed from one network to another. If it hits zero, attempting to route it again will result in an ICMP error which will be sent back to the sender.
 
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