| This is used to modify the IPv4 TTL header field. The TTL field determines |
| how many hops (routers) a packet can traverse until it's time to live is |
| exceeded. |
| .PP |
| Setting or incrementing the TTL field can potentially be very dangerous, |
| so it should be avoided at any cost. This target is only valid in |
| .B mangle |
| table. |
| .PP |
| .B Don't ever set or increment the value on packets that leave your local network! |
| .TP |
| \fB\-\-ttl\-set\fP \fIvalue\fP |
| Set the TTL value to `value'. |
| .TP |
| \fB\-\-ttl\-dec\fP \fIvalue\fP |
| Decrement the TTL value `value' times. |
| .TP |
| \fB\-\-ttl\-inc\fP \fIvalue\fP |
| Increment the TTL value `value' times. |