Dear all,
3 Computers are linked together with cross over cable and computer B is the
router.
Computer A - Starlight Video Server(Solaris)
- 192.168.0.11
Computer B - Iptables(Linux)
- eth0 - 192.168.0.12
- eth1 - 158.192.92.102
Computer C - Video receiver(Windows)
- 158.192.92.105
First
# echo "1" > /proc/sys/net/ipv4/ip_forward
it works fine, video receiver can receive the video from 192.168.0.11.
The purpose for using iptables is that Internet use can get access our video
server, also our video server can be protected by iptables.
Second
modprobe iptables
for TABLE in filter nat mangle; do
iptables -t $TABLE -F
iptables -t $TABLE -X
done;
iptables -t nat -A PREROUTING -p udp --dport 1911 -i eth1 -j \
DAT --to 192.168.0.11: 1911
iptables -A FORWARD -p udp --dport 1911 -d 192.168.0.11 --j ACCEPT
Video receiver can receive the video, but when we investigate the packets go
into video receiver.
Source IP: 192.168.0.11:1911
Destination IP: 158.192.92.105: 1069
Protocol: UDP
Packet Len: 1.46KB
Data Len: 1.42KB
Third, we execute one more line in order to change the source IP
# iptables -nat -A POSTROUTING -o eth1 -j \
SNAT --to 158.192.92.102
But the result doesn't change, we still get packet with source IP. 192.168.0
11.
I'd be grateful for any helps or advices.
Paul Yip
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