"HL" hoplimit target support

modulename: xt_HL.ko


Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering framework (Netfilter)
└─>Core Netfilter Configuration
└─>"HL" hoplimit target support
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
This option adds the "HL" (for IPv6) and "TTL" (for IPv4)
targets, which enable the user to change the
hoplimit/time-to-live value of the IP header.

While it is safe to decrement the hoplimit/TTL value, the
modules also allow to increment and set the hoplimit value of
the header to arbitrary values. This is EXTREMELY DANGEROUS
since you can easily create immortal packets that loop
forever on the network.

source code: