извините, не тот файл вставил. выложу лучше выводы iptables -L
Chain INPUT (policy ACCEPT 239 packets, 31547 bytes)
pkts bytes target prot opt in out source destination
0 0 DROP all -f any any anywhere anywhere
519 80053 ACCEPT all -- any any anywhere anywhere state RELATED,ESTABLISHED
539 48153 ULOG all -- any any anywhere anywhere ULOG copy_range 48 nlgroup 1 prefix `icount' queue_threshold 50
0 0 ACCEPT icmp -- eth1 any anywhere anywhere
300 16606 DROP all -- eth1 any anywhere anywhere
Chain FORWARD (policy ACCEPT 2 packets, 210 bytes)
pkts bytes target prot opt in out source destination
0 0 DROP all -f any any anywhere anywhere
0 0 ACCEPT all -- any any anywhere anywhere state RELATED,ESTABLISHED
2 210 ULOG all -- any any anywhere anywhere ULOG copy_range 48 nlgroup 1 prefix `fcount' queue_threshold 50
0 0 ACCEPT tcp -- eth1 any anywhere 172.21.255.234 tcp dpt:http
0 0 ACCEPT all -- eth1 any anywhere anywhere state RELATED,ESTABLISHED
0 0 DROP all -- eth1 any anywhere anywhere
Chain OUTPUT (policy ACCEPT 63 packets, 3159 bytes)
pkts bytes target prot opt in out source destination
0 0 DROP all -f any any anywhere anywhere
534 144K ACCEPT all -- any any anywhere anywhere state RELATED,ESTABLISHED
Chain PREROUTING (policy ACCEPT 789 packets, 62856 bytes)
pkts bytes target prot opt in out source destination
0 0 DNAT tcp -- any any anywhere mydom.ru tcp dpt:http to:172.21.255.234:80
Chain OUTPUT (policy ACCEPT 52 packets, 2822 bytes)
pkts bytes target prot opt in out source destination
Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
53 2927 MASQUERADE all -- any eth1 anywhere anywhere