I'm guessing you are running the original FreeLink? If so, it is set up to use the stock kernel.
There are some newer reworkings of this kernel w/ more modules... but I'm not sure about x.x.18. Is there something particular in 2.6.18 that you need?
Currently the Linux kernel is around 2.6.29 or so...
LS1 (foonas, nfs, Tranmission
print server, Firefly
for my Roku
Various LS-Pros v1,v2 (unbricked w/ serial & jtag)
KuroPro, LS2 & KuroHG (foonas)
Working on davysweather.dyndns.org
lately... => wooohooo!
Unknown command 'wooohooo!' - try 'help'