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10.6: VPN connections and Back To My Mac Network
Snow Leopard only hintI connect to my Mac at work quite frequently when I'm home, and I found something interesting. At work, I have a fixed IP address...except when I need a VPN connection to access certain servers that I administer. When I connect to the VPN, I get a different IP address that's dynamically assigned (i.e., I never know the exact address, only the subnet).

Given the snow storm on the East Coast, I worked from home and connected to my Mac at work. I had forgotten to terminate a VPN connection I had going the previous day, but I was able to connect to my Mac anyway, even though I entered my Mac's usual address when I connected, rather than the VPN-supplied address.

Even more startling was that I maintained my connection even when terminating the VPN connection. To confirm, I restarted the VPN connection on my remote Mac, yet I didn't lose my remote session. In the past, I would have to reconnect, hoping I had properly guessed my Mac's VPN-assigned address.

Just another example of thoughtfulness from Apple.
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10.6: VPN connections and Back To My Mac | 4 comments | Create New Account
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10.6: VPN connections and Back To My Mac
Authored by: Drizzt on Feb 11, '10 08:22:48AM

It depends on your VPN. Some VPN clients will take control over the whole network stack and won't allow anything else than the traffic going through it, other VPNs will allow local traffic to go.

What you did here is access your Mac outside your VPN, so when you closed it, the connection was not dropped.

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10.6: VPN connections and Back To My Mac
Authored by: diamondsw on Feb 11, '10 09:03:28AM

Exactly - by connecting to the non-VPN address, you were connecting without the VPN being involved at all. Nothing out of the ordinary there. Now if the VPN had been set to send all traffic across it, things probably wouldn't have worked this way.

(Jesus, TWO captchas, and that's after logging in? Come on!)

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10.6: VPN connections and Back To My Mac
Authored by: adams4 on Feb 12, '10 09:13:45AM

The VPN behaved differently in 10.5. All too many times, I signed into the VPN on my remote Mac, and I'd lose the connection to the remote Mac. The only way I'd be able to get it back it to determine its "new" address. In 10.6, the connections run dually, rather than one IP "blotting out" the other.

Adam Spector.

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10.6: VPN connections and Back To My Mac
Authored by: Michelasso on Feb 16, '10 05:09:28AM

A VPN connection just adds another IP interface with its own IP address. Then it's up to the routed configuration to decide how to split the traffic. One may have 1 or more VPNs connecting "in parallel" to work's corporate networks, while the normal Internet traffic goes through the default interface. Sure, I don't know if such configuration can be done automagically by the VPN client, but this is more or less like VPNs work.

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