To update freebsd box, isolated from internet:
1. portupgrade -arRFO | grep "fetch: ftp://ftp6.ru" | sort | uniq | sed 's/.*h: (.*):.*/1/' > fetch.txt
On machine with internet connection run:
2. wget -x -i fetch.txt
Still, I have’nt figured out what to do with “pkgdb -F” required downloads in such circumstances.