How to share internet if the server connects to it via VPN?

Hi, mac brothers! Need your help.
I have a server with 2 ethernet cards (en0, en1). It connects to internet via VPN on en0. LAN clients connect to the server using en1. I can't share VPN internet connection to LAN %(. (tried to find the answer in the 10.4 server documentation, but there is nothing about it).
I know how to share internet connection when there is no VPN - direct connection via DSL modem...
Can you help me?
PS; 0S X Server 10.4.11

You need to use NAT and have the firewall running.
And then you need to use the VPN connection (PPTP?) "interface" (when connected), probably ppp0 - not en0, in your NAT config. This can be achieved by dragging the config (small symbol in lower right corner in NAT config in Server Admin) to the desktop, edit it (look for en0 and change it to ppp0), save it, and then drag it back into the NAT config window and save.
I think the VPN tunnel must be up before turning on NAT/firewall so if you reboot the server you might need to turn NAT/firewall off -> on to make it work again.
If the WAN/ppp0 IP is not static (so you can enter it in your server DNS) you probably will have trouble with many of OS X services running in the server.
Most OS X server installations using an Internet connection with a shifting public IP is better off by putting a NAT router which can do the in initial connection (by DHCP, PPTP, PPPoE, whatever), between it and the Internet.

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How to share internet-connection over vpn

Hallo,
first, sorry for my bad english...
i have a mac mini 2011 with os x mavericks and os x server.
i use a vpn connection for my mobile clients. these clients need to connect to the internet with the same connection as the server.
how do i share the connection for my vpn clients?
thx
cgwaldt

Mr. cgwaldt:
I just ran some tests and confirmed the method. To mask your ip address via your vpn do the following.
1. Create a vpn connection to your server.
2. Use Finder to start your ScreenSharing.app. This app is located at /System/Library/CoreServices/ScreenShare
3. When you start the app, it will ask you for the ip address of the network computer. Enter the ip address of your server.
4. Log in with a registered account on that server.
5. Do all your work through the shared screen.
I have taken a screen shot. You will see two browsers in the screen shot. One is open on my local computer, and the other is open on the ShareScreen app. The one in the ShareScreen app shows the static IP address of my office. The one that is on my local machine shows the dynamic IP address provided by my mobile internet provider. Note, my advice in a previous post was not entirely correct; I am forcing all traffic through the VPN tunnel in this picture, and I expected my local machine to have the static ip address that is the same as the one in the ShareScreen app. Even with all network traffic going back to my home server, I run into the problem that you spoke of, but the solution is to use that connection to work from a home computer, and then the problem is solved.
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In this example, the webpage that is showing 173.198.104.130 would be the one that you would use for your billing. That IP address is the static IP of my office, which is where the "Mavericks1" computer is located.
For this test, I used a mobile hotspot on an Android Ice Cream Sandwhich operating system running on an HTC Rizound celular phone. The connection speed is mediocre, and the delay was not bad. If you are working in a hotel or have access to a much better wireless connection, then the delay will probably be minimal at best.
I hope this helps.
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route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 br0
humm should be 192.168.0.1 the adress of the rooter
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br0 Link encap:Ethernet HWaddr 00:02:6F:8A:AE:13
inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::211:d8ff:febc:588f/64 Scope:Link
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RX packets:12 errors:0 dropped:1 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
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RX packets:16 errors:0 dropped:0 overruns:0 frame:0
TX packets:20 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2175 (2.1 Kb) TX bytes:1808 (1.7 Kb)
Interrupt:19 Base address:0xc800
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inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
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RX packets:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
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RX packets:30 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1777 (1.7 Kb) TX bytes:0 (0.0 b)
wlan0 Link encap:Ethernet HWaddr 00:02:6F:8A:AE:13
inet6 addr: fe80::202:6fff:fe8a:ae13/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:16 errors:0 dropped:0 overruns:0 frame:0
TX packets:29 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1849 (1.8 Kb) TX bytes:3804 (3.7 Kb)
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