Magyarázat nélkül:
#!/bin/sh
# TCP Proxy using IPTables
IPTABLES=/sbin/iptables
echo 1 > /proc/sys/net/ipv4/ip_forward
# Flush nat table
$IPTABLES -t nat -F
# tcpproxy LOCAL_IP LOCAL_PORT REMOTE_IP REMOTE_PORT
function tcpproxy {
$IPTABLES -t nat -A PREROUTING --dst $1 -p tcp --dport $2 -j DNAT --to-destination $3:$4
$IPTABLES -t nat -A POSTROUTING --dst $3 -p tcp --dport $4 -j SNAT --to-source $1
$IPTABLES -t nat -A OUTPUT --dst $1 -p tcp --dport $2 -j DNAT --to-destination $3:$4
}
# Example 1
tcpproxy 192.168.40.244 3200 10.10.10.2 3200
# Example 2
tcpproxy 192.168.40.245 3200 192.168.1.30 3200