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Set up external IP's behind router

Posted on 2003-03-03
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Last Modified: 2012-05-04
I have a DSL router which obtains a connection to my isp with a dynamic IP.  I am going to ask for some static IP's.  How do i set the pcs up with external ip's behind the router so that they are visible on the internet.
Is it possible?
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Question by:david_w__uk
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Expert Comment

by:tatsujin
ID: 8056440
Hi David_w__uk,

First get the IP address/addresses from the ISP ;)

Now depending on the options you have available on your router, you will first have to set up the NAT to allow the IP address to be mapped to the PC's behind your router (the ones you have at home).

NAT is the translating of your public address (the fixed one you get from the network - commonly called WAN address) to the addresses on your LAN side, or the PC's you have at home.

Set up a "Static WAN" route on your router, this involves putting the Fixed IP address in the field.  Now you set up the "Static WAN mapping". This will tell the router to map the WAN address to the LAN address.

Finally you will have to open up your firewall to allow the IP address through to the LAN side.

I apologise if this is a bit vague but it really depends on your particular product, I have seen many different router, they all do pretty much the same things but they all tend to name the repsective features differently.

If you have any further trouble, don't hesitate to ask!

Tatsujin
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Accepted Solution

by:
tatsujin earned 400 total points
ID: 8056460
Hi David once again,

Just an addendum to the answer

If you want to give your PC's public IP addresses, just assign them to the respective LAN PC's in network neighbourhood. Then you could just turn off NAT in the oruter as there would be no need for translation. If the router has SPI (stateful packet inspection), it should allow the packet back in provided it originated from the LAN side.

Tatsujin
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Author Comment

by:david_w__uk
ID: 8058775
Cheers, just what i wanted to know.
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