хрень какая-то получается
iptables-save
# Generated by iptables-save v1.4.4 on Fri Jul 9 15:02:34 2010
*nat
:PREROUTING ACCEPT [141852:14034677]
:POSTROUTING ACCEPT [2114:162890]
:OUTPUT ACCEPT [2063:160442]
-A POSTROUTING -s 10.75.31.31/32 -o ppp0 -j MASQUERADE
-A POSTROUTING -s 10.75.31.36/32 -o ppp0 -p tcp -m tcp --dport 5190 -j MASQUERADE
COMMIT
# Completed on Fri Jul 9 15:02:34 2010
# Generated by iptables-save v1.4.4 on Fri Jul 9 15:02:34 2010
*mangle
:PREROUTING ACCEPT [246922:54032355]
:INPUT ACCEPT [131887:44636565]
:FORWARD ACCEPT [4766:553352]
:OUTPUT ACCEPT [44168:6179290]
:POSTROUTING ACCEPT [49286:6807866]
COMMIT
# Completed on Fri Jul 9 15:02:34 2010
# Generated by iptables-save v1.4.4 on Fri Jul 9 15:02:34 2010
*filter
:INPUT ACCEPT [131887:44636565]
:FORWARD ACCEPT [4766:553352]
:OUTPUT ACCEPT [44164:6178986]
COMMIT
# Completed on Fri Jul 9 15:02:34 2010
tcpdump
14:59:32.225727 ARP, Request who-has 10.75.31.17 tell 10.75.31.36, length 92
14:59:32.225771 ARP, Reply 10.75.31.17 is-at 00:14:85:d2:ee:73, length 28
14:59:32.225934 IP 10.75.31.36.1843 > 195.68.160.27.80: Flags [S], seq 2996196329, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:32.522232 IP 10.75.31.36.1846 > 195.68.160.27.80: Flags [S], seq 1155820242, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:32.523834 IP 10.75.31.36.1847 > 205.188.251.43.5190: Flags [S], seq 1893185314, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:33.225970 IP 205.188.251.43.5190 > 10.75.31.36.1847: Flags [S.], seq 3856152916, ack 1893185315, win 16384, options [mss 1360], length 0
14:59:33.226228 IP 10.75.31.36.1847 > 205.188.251.43.5190: Flags [.], ack 1, win 65535, length 0
14:59:33.545902 IP 205.188.251.43.5190 > 10.75.31.36.1847: Flags [P.], seq 1:11, ack 1, win 16384, length 10
14:59:33.547431 IP 10.75.31.36.1847 > 205.188.251.43.5190: Flags [P.], seq 1:108, ack 11, win 65525, length 107
14:59:34.045891 IP 205.188.251.43.5190 > 10.75.31.36.1847: Flags [.], ack 108, win 16384, length 0
14:59:34.165901 IP 205.188.251.43.5190 > 10.75.31.36.1847: Flags [P.], seq 11:684, ack 108, win 16384, length 673
14:59:34.169046 IP 10.75.31.36.1847 > 205.188.251.43.5190: Flags [P.], seq 108:114, ack 684, win 64852, length 6
14:59:34.169948 IP 10.75.31.36.1847 > 205.188.251.43.5190: Flags [F.], seq 114, ack 684, win 64852, length 0
14:59:34.191242 IP 10.75.31.36.1850 > 195.68.160.27.80: Flags [S], seq 2328017008, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:34.192828 IP 10.75.31.36.1851 > 195.68.160.27.80: Flags [S], seq 93123457, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:34.224182 IP 10.75.31.36.1852 > 195.239.111.174.5222: Flags [S], seq 517634119, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:34.545893 IP 205.188.251.43.5190 > 10.75.31.36.1847: Flags [R.], seq 684, ack 114, win 16384, length 0
14:59:35.200307 IP 10.75.31.36.1843 > 195.68.160.27.80: Flags [S], seq 2996196329, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:35.502082 IP 10.75.31.36.1846 > 195.68.160.27.80: Flags [S], seq 1155820242, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:37.010971 IP 10.75.31.36.1850 > 195.68.160.27.80: Flags [S], seq 2328017008, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:37.011040 IP 10.75.31.36.1851 > 195.68.160.27.80: Flags [S], seq 93123457, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:37.111563 IP 10.75.31.36.1852 > 195.239.111.174.5222: Flags [S], seq 517634119, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:38.225839 ARP, Request who-has 10.75.31.36 tell 10.75.31.17, length 28
14:59:38.226055 ARP, Reply 10.75.31.36 is-at 00:17:31:81:7f:26, length 92
14:59:41.135257 IP 10.75.31.36.1843 > 195.68.160.27.80: Flags [S], seq 2996196329, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:41.437051 IP 10.75.31.36.1846 > 195.68.160.27.80: Flags [S], seq 1155820242, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:43.046485 IP 10.75.31.36.1850 > 195.68.160.27.80: Flags [S], seq 2328017008, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:43.046553 IP 10.75.31.36.1851 > 195.68.160.27.80: Flags [S], seq 93123457, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:43.147118 IP 10.75.31.36.1852 > 195.239.111.174.5222: Flags [S], seq 517634119, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:50.577670 IP 10.75.31.36.1854 > 195.68.160.27.80: Flags [S], seq 1807455259, win 65535, options [mss 1460,nop,nop,sackOK], length 0
14:59:53.508130 IP 10.75.31.36.1854 > 195.68.160.27.80: Flags [S], seq 1807455259, win 65535, options [mss 1460,nop,nop,sackOK], length 0
это я на асфальте в лыжи обутый или кип не хочет коннектиться без допуска к своим серверам?