Time To Live in a IP header

This is a discussion on Time To Live in a IP header within the Networking/Device Communication forums, part of the General Programming Boards category; This is a sanity check. An IP packet has a TTL field of 8 bits. that means a count of ...

  1. #1
    Dragon Rider jas_atwal's Avatar
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    Time To Live in a IP header

    This is a sanity check. An IP packet has a TTL field of 8 bits. that means a count of 256. That means an IP packet can traverse 256 hops before it is dropped? isn't that a too large value for real world?

    Please correct me if I understand wrong.

    Thank you all!!
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    Captain Crash brewbuck's Avatar
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    Quote Originally Posted by jas_atwal View Post
    This is a sanity check. An IP packet has a TTL field of 8 bits. that means a count of 256. That means an IP packet can traverse 256 hops before it is dropped? isn't that a too large value for real world?

    Please correct me if I understand wrong.

    Thank you all!!
    The TTL counts down from some initial value to zero. Yes, it is possible to create a packet with a TTL of 255, but what would be the point? Most packets have a starting TTL much less than that.

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    I was always under the impression that most packets had it set to 256 as it's only used to stop infinite routing loops which are relatively rare afaik. I don't think it has much practical use in modern networks.

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    Per the current RFC 1700. The current recommended default time to live (TTL) for the Internet Protocol (IP) is 64.

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