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Date: Sat, 01 Nov 2008 12:23:51 +0500
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Добрый день!

Подскажите как правильно написать правила. Мне нужна подменять адреса во 
всех случаях кроме когда адрес получателя: 172.16.x.x, 192.168.x.x, и 
ещё некоторые белые.

Например для подсети 172.16.0.0 это выглядит так:
iptables -I POSTROUTING -s 192.168.0.0/24 -d ! 172.16.0.0/24 -t nat -j 
MASQUERADE

А как сделать сразу отрицание для всех нужных подсетей?