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This is a discussion on require shell script within the Shell scripting forums, part of the Development/Scripting category; Dear All. I need a shell script for Linux. The scenrio is .... I have one Linux Box with two ...


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Old 04-08-2006, 03:44 PM
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puppen
Default require shell script
Dear All.

I need a shell script for Linux. The scenrio is ....
I have one Linux Box with two NIC on that on is configure for private IP and second is configure for public IP.
What I want is I have one another server on LAN which is Window Server
and client are connect through RDP, I need a shell script which forward ( anyone configure the Public IP they get the RDP of Windows Server ).
Pls help me.

Thanks.
Puppen
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Old 04-08-2006, 06:51 PM
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For RDP from Linux to windows you need to use rdesktop command. Script is not needed or may be you need to give us more info
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Old 04-11-2006, 11:34 PM
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puppen
Default Re: require shell script
Dear Tom.

Thanks fot reply.
The sceniro ia that
some remote users are connected to WIndows Server using RDP , using private leased line. If this line goes down they are not able to connect to server.
I have internet connection , what i wan t is Users connect to RDP server via internet using Linux Box between them,
I can not give live IP to Win Server. They must come through Linux, for that I require shell script. Win RDP uses Port 3389, but How I configure port forwarding using Linux .



Quote:
Originally Posted by puppen
Dear All.

I need a shell script for Linux. The scenrio is ....
I have one Linux Box with two NIC on that on is configure for private IP and second is configure for public IP.
What I want is I have one another server on LAN which is Window Server
and client are connect through RDP, I need a shell script which forward ( anyone configure the Public IP they get the RDP of Windows Server ).
Pls help me.

Thanks.
Puppen
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Old 04-12-2006, 08:03 AM
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Ok so you wanna have a Windows server on your internal network that you want make available externally, you can use the -j DNAT target of the PREROUTING chain in NAT to specify a destination IP address and port where incoming packets requesting a connection to your internal service can be forwarded. For example, if you wanted to forward incoming UDP 3389 requests to your dedicated Windows Server server system at 172.31.0.5, run the following command at shell prompt (or add to your iptables script):

Enable ip forward, type following command at shell prompt:
Code:
sysctl -w net.ipv4.ip_forward=1
Type following iptables rules at shell or in your script:
Code:
iptables -A FORWARD -i eth1 -j ACCEPT
iptables -A FORWARD -o eth1 -j ACCEPT
iptables -t nat -A PREROUTING -i eth0 -p udp --dport 3389 -j DNAT --to 172.31.0.5:3389
iptables -A FORWARD -i eth0 -p udp --dport 3389 -d 172.31.0.5 -j ACCEPT
So all user will connect to public IP and connection will go to windows server 172.31.0.5.

Code:
Public IP -->Linux Box/Router --> Windows box
3389     -->    forward to        --> internal windows box 172.31.0.5
eth0 ==> assuming the firewall/gateway is assigned public IP address on eth0
eth1 ==> assuming the firewall/gateway is assigned an internal IP address on eth1
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Old 04-12-2006, 09:42 PM
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Dear Rocky.
Thank you very much for your reply. I am very greateful to you.
The script which you have given, is bit incomplete but what ever you given is right.
I added one line in that script and script is working fine.

Anyway thank you very much for your support.


Quote:
Originally Posted by rockdalinux
Ok so you wanna have a Windows server on your internal network that you want make available externally, you can use the -j DNAT target of the PREROUTING chain in NAT to specify a destination IP address and port where incoming packets requesting a connection to your internal service can be forwarded. For example, if you wanted to forward incoming UDP 3389 requests to your dedicated Windows Server server system at 172.31.0.5, run the following command at shell prompt (or add to your iptables script):

Enable ip forward, type following command at shell prompt:
Code:
sysctl -w net.ipv4.ip_forward=1
Type following iptables rules at shell or in your script:
Code:
iptables -A FORWARD -i eth1 -j ACCEPT
iptables -A FORWARD -o eth1 -j ACCEPT
iptables -t nat -A PREROUTING -i eth0 -p udp --dport 3389 -j DNAT --to 172.31.0.5:3389
iptables -A FORWARD -i eth0 -p udp --dport 3389 -d 172.31.0.5 -j ACCEPT
So all user will connect to public IP and connection will go to windows server 172.31.0.5.

Code:
Public IP -->Linux Box/Router --> Windows box
3389     -->    forward to        --> internal windows box 172.31.0.5
eth0 ==> assuming the firewall/gateway is assigned public IP address on eth0
eth1 ==> assuming the firewall/gateway is assigned an internal IP address on eth1
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