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ROPE Language Reference - "$ip_ttl"

The "$ip_ttl" register contains the time-to-live value for the packet being inspected. It is a read-only, integer register.

RFC_791 descibes the TTL in these terms..

Time to Live:  8 bits

 This field indicates the maximum time the datagram is allowed to
 remain in the internet system.  If this field contains the value
 zero, then the datagram must be destroyed.  This field is modified
 in internet header processing.  The time is measured in units of
 seconds, but since every module that processes a datagram must
 decrease the TTL by at least one even if it process the datagram in
 less than a second, the TTL must be thought of only as an upper
 bound on the time a datagram may exist.  The intention is to cause
 undeliverable datagrams to be discarded, and to bound the maximum
 datagram lifetime.

See Also

RFC_791, $ip_check, $ip_daddr, $ip_dont_frag, $ip_frag_off, $ip_id, $ip_ihl, $ip_protocol, $ip_saddr, $ip_tos, $ip_tot_len, $ip_version

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