1This is used to modify the IPv4 TTL header field.  The TTL field determines
2how many hops (routers) a packet can traverse until it's time to live is
3exceeded.
4.PP
5Setting or incrementing the TTL field can potentially be very dangerous,
6so it should be avoided at any cost. This target is only valid in
7.B mangle
8table.
9.PP
10.B Don't ever set or increment the value on packets that leave your local network!
11.TP
12\fB\-\-ttl\-set\fP \fIvalue\fP
13Set the TTL value to `value'.
14.TP
15\fB\-\-ttl\-dec\fP \fIvalue\fP
16Decrement the TTL value `value' times.
17.TP
18\fB\-\-ttl\-inc\fP \fIvalue\fP
19Increment the TTL value `value' times.
20