could someone explain

"
   Miscellaneous
     By default, gif tunnels may not be nested.  This behavior may be
modified
     at runtime by setting the sysctl(8) variable net.link.gif.max_nesting
to
     the desired level of nesting.  Additionally, gif tunnels are
restricted
     to one per pair of end points.  Parallel tunnels may be enabled by
set-
     ting the sysctl(8) variable net.link.gif.parallel_tunnels to 1.
"


i mean
net.link.gif.parallel_tunnels

what are parallel tunnels? can i tunnel packets through 2 different
local and remote IP's? would be really useful