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Can I disconnect from my ISP?

Posted on 2004-05-01
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Last Modified: 2013-11-30
Can I disconnect from my ISP when I have successfully established a vpn connection to a remote computer. Will it not be disonnected with the disconnection of my ISP from my computer?

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Question by:silapa
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pseudocyber earned 50 total points
ID: 10967134
VPN runs over the Internet (usually).  If you lose your Internet connection, you lose your VPN connection.

VPN is simply a way to authenticate yourself to a remote site and once you are authenticated, a way to encrypt your traffic as it tunnels through a third party network (like the Internet).
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by:funkusmunkus
ID: 10967138
you'd loose the VPN.
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by:ispeed-jeremy
ID: 10967539
Your ISP provides your bridge to your VPN, no ISP, no VPN, if your paying for DATA from your ISP, be concious that when you iniate your VPN it doesn't set your systems default route (0.0.0.0) to the address on the VPN network, as both your VPN and Internet traffic would then be routed from your VPN site, which will both add load on the network on the VPN side, plus all your Internet traffic will result in more data being transferred than requried, especially if your VPN is encryped.
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by:Bing CISM / CISSP
ID: 10968272
hi silapa, i am not sure why you want to keep VPN connection while disconnecting the link to ISP, anyway, if you really want to do it, you may consider to delete those *unnecessary* routes to ISP.
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by:andreas_be
ID: 10975701

As the first comment stipulates, VPN Connections resides over ISP Connections so by disconnecting to your ISP Will automaticaly disconnect your VPN .!
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by:ksquare
ID: 10991675
I'm presuming you may be asking because you want to limit your machines exposure to the Internet and just get everything over the safer encrypted vpn tunnel from a presumably more secure corp. network.

In which case the vpn admin can disable split tunnelling so when the vpn is active your machine will only send/receive through the tunnel.  That includes any traffic that has to come from or go to the Internet.

eg.  while the vpn is active your machine is not directly accessible outside of the tunnel.
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by:Bing CISM / CISSP
ID: 10996019
> disable split tunnelling?

ksquare, could you please explain more on it? thanks.
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by:ksquare
ID: 11010795
we use Cisco vpn concentrator and clients.  On the concentrator when a group is defined we can force this setting.  example.  We can leave it so the client only sends internal network traffic through the vpn and any other traffic goes straight out the internet connection.  Split Tunnelling.

I set it up so when the tunnel is active ALL traffic goes through the tunnel including internet traffic.  That way it also still has to go through our corporate firewall and filtering software.

It is also possible in the Cisco setup to list specific networks that the client can route to directly such as their home lan.  Again, for security reasons, when they're on the corporate lan via vpn thats all they have access too.  So another home machine can't relay through.

Kevin
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by:pseudocyber
ID: 11046237
Silapa, did we answer it for you - No.
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by:silapa
ID: 11051914
Yes, youve answerit all. Thanks
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by:Bing CISM / CISSP
ID: 11125601
silapa, if so please close this question by accept one or more helpful comments above. thanks,
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