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Appleman · Jan 6, 2003, 05:57 PM

having a ABS with my TiBook running on a IP address like 10.0.1.x, how do I get connected to this Mac from the outside internet like looking at my local website f.i.?

Thanks.

Putta · Jan 6, 2003, 06:32 PM

In short you have to set-up port-forwarding. This will obviously depend on what you want to do. If it is just website hosting I think you only need to forward port 80 to the tibook, maybe 427 (looking at the OSX firewall - I am sure someone else can confirm).

To do this, you will have to assign an IP address to your TiBook rather than just getting one with DHCP. There is an option under Network preferences to use DHCP with Manual IP but I have never got it to work. Set the configure tab to manually, IP address to 10.0.1.201, Subnet Mask to 255.255.255.0, Router to 10.0.1.1 and DNS servers to 10.0.1.1.

To set up port-forwarding, open the Airport admin utility, click configure and type in your password. Click the port mapping tab and click the add button. Enter the public and private port numbers, 80 for web hosting (don't worry that they are the same), and make sure the Private address box has 201 so that the private address is 10.0.1.201.

Once you have done this, find out your public IP address and try it. If you are going through a router you are in for a lot more fun. Write here and I will post a follow-up if necessary. Hope this helps!!!

Rohan

Appleman · Jan 6, 2003, 06:45 PM

Originally posted by Putta:
In short you have to set-up port-forwarding. This will obviously depend on what you want to do. If it is just website hosting I think you only need to forward port 80 to the tibook, maybe 427 (looking at the OSX firewall - I am sure someone else can confirm).

To do this, you will have to assign an IP address to your TiBook rather than just getting one with DHCP. There is an option under Network preferences to use DHCP with Manual IP but I have never got it to work. Set the configure tab to manually, IP address to 10.0.1.201, Subnet Mask to 255.255.255.0, Router to 10.0.1.1 and DNS servers to 10.0.1.1.

To set up port-forwarding, open the Airport admin utility, click configure and type in your password. Click the port mapping tab and click the add button. Enter the public and private port numbers, 80 for web hosting (don't worry that they are the same), and make sure the Private address box has 201 so that the private address is 10.0.1.201.

Once you have done this, find out your public IP address and try it. If you are going through a router you are in for a lot more fun. Write here and I will post a follow-up if necessary. Hope this helps!!!

Rohan

As soon as I do DHCP on manual, there's no internet anymore.

I understood Port Mapping has to be done in the Airport Admin Utility but do not understand why it comes up with this 10.0.1.201 as I have, indeed, a DHCP so get addresses like 10.0.1.2 to 10.0.1.9 or so.

Why does webbrowsing stops as soon as I do this manual DHCP stuff?
Do I have to do something with NAT etc? As I'm using the ABS also for ethernet bridging to the iMac.

Thanks.

Putta · Jan 6, 2003, 07:07 PM

OK, the most likely reason that you have lost internet connectivity is just a DNS server problem. Make sure the umber in the DNS server box is the same as the airport basestation which will then handle that for you. DHCP assigns you an IP address but can assign you one of 200 or thereabouts. You need to have a static address for port forwarding to work or it will be forwarding packets to another IP address. The basestation assigns numbers automatically using DHCP up to 10.0.1.201. After that, it leaves some blank for you to assign yourself.

Check your network preferences when set to DHCP. When you set them to manual, make sure the only difference is in the DNS server box and obviously in your IP address. If this doesn't work, find out the IP address of your ISP's DS server and enter that directly into the DNS server box.

Let me know...

Appleman · Jan 6, 2003, 07:25 PM

Originally posted by Putta:
OK, the most likely reason that you have lost internet connectivity is just a DNS server problem. Make sure the umber in the DNS server box is the same as the airport basestation which will then handle that for you. DHCP assigns you an IP address but can assign you one of 200 or thereabouts. You need to have a static address for port forwarding to work or it will be forwarding packets to another IP address. The basestation assigns numbers automatically using DHCP up to 10.0.1.201. After that, it leaves some blank for you to assign yourself.

Check your network preferences when set to DHCP. When you set them to manual, make sure the only difference is in the DNS server box and obviously in your IP address. If this doesn't work, find out the IP address of your ISP's DS server and enter that directly into the DNS server box.

Let me know...

Doesn't work. As soon as I give it the DHCP with manual, it doesn't get a Router number. neither after waiting some time (as it does when going back to DHCP) or even a restart. I did give the DNS numbers in the System Preferences->Network->Airport the same value as in the Airport Admin Utitlity->Internet, but as stated, no connection.

Have to sleep now, it's late here (2.30 pm...). Thanks anyway. Any more help is welcome!

Putta · Jan 7, 2003, 06:01 AM

I think I've figured it out.

Instead of using DHCP with manual IP address, use the "Manually" option. With this scenario, keep Subnet mask to 255.255.255.0 and Router as 10.0.1.1 and set IP address to 10.0.1.201. Under DNS Servers, enter 10.0.1.1

I think that the IP address you are setting is outside the DHCP range (so that it doesn't change). Therefore you must configure manually. It is worth noting that any other computers can still connect to your basestation and have internet connectivity if set to DHCP.

Hope this works....

bjresta · Feb 23, 2003, 09:57 AM

This solution seems to work fine without a router, but it fails when I have a router between my cable modem and Airport.

What other changes do I need to make because of the router?

Also, if you have time, what specific ports need to be mapped? What do they do? Does it make a difference if they are mapped public, private, or both?

Thanks a lot!

Camelot · Feb 23, 2003, 02:27 PM

Originally posted by bjresta:
This solution seems to work fine without a router, but it fails when I have a router between my cable modem and Airport.

What other changes do I need to make because of the router?

Hang on, you're running a router AND a Airport Base Station?

You should check that only ONE of them is running NAT.

If your router is configured to handle NAT and port forwarding, you should change your base station so that it is in 'bridging' mode (turn off the 'distribute IP address' option (or whatever it's called) in the AirPort admin.

It sounds like your router has the real-world IP address and is using NAT and DHCP to assign addresses to internal hosts, including the base station. The base station takes this address and performs an additional NAT translation before passing it on to the DHCP clients that got their address from the base station.

That's overly complex and will lead to all kinds of issues when trying to debug network issues.

In general, either the base station or the router should perform NAT, but not both of them.