Исходное сообщение
"Двойной переброс портов" Отправлено angra, 03-Мрт-09 00:17
Ну если с мобилы открывается, то NAT работает, а вот неверный размер MTU и запрет на фрагментацию вполне могли привести к проблеме для больших пакетов. из man iptables: TCPMSS        This  target allows to alter the MSS value of TCP SYN packets, to control the maximum size for that connection (usually limiting it to your out-        going interface's MTU minus 40 for IPv4 or 60 for IPv6, respectively).  Of course, it can only be used in conjunction with -p tcp.  It  is  only        valid in the mangle table.        This target is used to overcome criminally braindead ISPs or servers which block "ICMP Fragmentation Needed" or "ICMPv6 Packet Too Big" packets.        The symptoms of this problem are that everything works fine from your Linux firewall/router, but machines behind it  can  never  exchange  large        packets:         1) Web browsers connect, then hang with no data received.         2) Small mail works fine, but large emails hang.         3) ssh works fine, but scp hangs after initial handshaking.        Workaround: activate this option and add a rule to your firewall configuration like:         iptables -t mangle -A FORWARD -p tcp --tcp-flags SYN,RST SYN \                     -j TCPMSS --clamp-mss-to-pmtu        --set-mss value               Explicitly set MSS option to specified value.        --clamp-mss-to-pmtu               Automatically clamp MSS value to (path_MTU - 40 for IPv4; -60 for IPv6).        These options are mutually exclusive.