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How to enable split/full tunnel while VPNed??

 
 
Gilbert
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      07-11-2007, 09:50 PM
I'm running a Windows 2003 Small Business Server and I setup remote access on
it. I'm using PPTP. I've opened up port 1723 and GRE Protocol 47 to be
forwarded to the server thru the router/firewall. I can connect to the
server remotely and access internal resources. However, I can't Internet
when I'm VPNed in.

1. Is there a way to enable split (sometimes called full) tunnel so that I
can access the Internet while I'm VPNed in?

2. Are users restricted to only 1 session? What I mean by that is can I
just create a user called Remote or whatever and then have multiple users use
that same account?
 
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Bill Grant
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      07-12-2007, 01:49 AM
By default a client will have its default gateway set to the VPN
tunnel,so all non-local traffic goes over the VPN link.. To keep your
existing gateway you clear the "use default gateway on remote network" in
the client's connection properties. The client then only gets a subnet route
through the tunnel. See KB 254231 for more details.

"Gilbert" <(E-Mail Removed)> wrote in message
news:A70A6A32-1E19-4C80-9D1C-(E-Mail Removed)...
> I'm running a Windows 2003 Small Business Server and I setup remote access
> on
> it. I'm using PPTP. I've opened up port 1723 and GRE Protocol 47 to be
> forwarded to the server thru the router/firewall. I can connect to the
> server remotely and access internal resources. However, I can't Internet
> when I'm VPNed in.
>
> 1. Is there a way to enable split (sometimes called full) tunnel so that
> I
> can access the Internet while I'm VPNed in?
>
> 2. Are users restricted to only 1 session? What I mean by that is can I
> just create a user called Remote or whatever and then have multiple users
> use
> that same account?



 
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Pieman
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      07-12-2007, 01:00 PM
Gilbert

Allowing split tunnelling is a massive security no no, it should be avoided
at all costs, if the client is compromised in what ever shape or fashion you
would be exposing your internal corporate resources out on to the web.


"Gilbert" <(E-Mail Removed)> wrote in message
news:A70A6A32-1E19-4C80-9D1C-(E-Mail Removed)...
> I'm running a Windows 2003 Small Business Server and I setup remote access
> on
> it. I'm using PPTP. I've opened up port 1723 and GRE Protocol 47 to be
> forwarded to the server thru the router/firewall. I can connect to the
> server remotely and access internal resources. However, I can't Internet
> when I'm VPNed in.
>
> 1. Is there a way to enable split (sometimes called full) tunnel so that
> I
> can access the Internet while I'm VPNed in?
>
> 2. Are users restricted to only 1 session? What I mean by that is can I
> just create a user called Remote or whatever and then have multiple users
> use
> that same account?



 
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Gilbert
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Posts: n/a

 
      07-18-2007, 07:22 PM
I tried that but as soon as I do that, I can't connect to any resources on
the remote network.

I have a static address pool setup but I didn't see any spot in there where
I can specify a default gateway or dns info. (I can only input an address
range)

"Bill Grant" wrote:

> By default a client will have its default gateway set to the VPN
> tunnel,so all non-local traffic goes over the VPN link.. To keep your
> existing gateway you clear the "use default gateway on remote network" in
> the client's connection properties. The client then only gets a subnet route
> through the tunnel. See KB 254231 for more details.
>
> "Gilbert" <(E-Mail Removed)> wrote in message
> news:A70A6A32-1E19-4C80-9D1C-(E-Mail Removed)...
> > I'm running a Windows 2003 Small Business Server and I setup remote access
> > on
> > it. I'm using PPTP. I've opened up port 1723 and GRE Protocol 47 to be
> > forwarded to the server thru the router/firewall. I can connect to the
> > server remotely and access internal resources. However, I can't Internet
> > when I'm VPNed in.
> >
> > 1. Is there a way to enable split (sometimes called full) tunnel so that
> > I
> > can access the Internet while I'm VPNed in?
> >
> > 2. Are users restricted to only 1 session? What I mean by that is can I
> > just create a user called Remote or whatever and then have multiple users
> > use
> > that same account?

>
>
>

 
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Bill Grant
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      07-18-2007, 11:47 PM
No, you cannot specify a default gateway in that case. If you clear the
"use default gateway..." switch, the default gateway remains the same as it
was before, so that you can still access the Internet. Instead you get a
subnet route to the remote site. Is IP routing enabled on the VPN server so
that it can route between the LAN subnet and your address pool subnet?

"Gilbert" <(E-Mail Removed)> wrote in message
news:9511098F-5308-46CC-9F9A-(E-Mail Removed)...
>I tried that but as soon as I do that, I can't connect to any resources on
> the remote network.
>
> I have a static address pool setup but I didn't see any spot in there
> where
> I can specify a default gateway or dns info. (I can only input an address
> range)
>
> "Bill Grant" wrote:
>
>> By default a client will have its default gateway set to the VPN
>> tunnel,so all non-local traffic goes over the VPN link.. To keep your
>> existing gateway you clear the "use default gateway on remote network" in
>> the client's connection properties. The client then only gets a subnet
>> route
>> through the tunnel. See KB 254231 for more details.
>>
>> "Gilbert" <(E-Mail Removed)> wrote in message
>> news:A70A6A32-1E19-4C80-9D1C-(E-Mail Removed)...
>> > I'm running a Windows 2003 Small Business Server and I setup remote
>> > access
>> > on
>> > it. I'm using PPTP. I've opened up port 1723 and GRE Protocol 47 to
>> > be
>> > forwarded to the server thru the router/firewall. I can connect to the
>> > server remotely and access internal resources. However, I can't
>> > Internet
>> > when I'm VPNed in.
>> >
>> > 1. Is there a way to enable split (sometimes called full) tunnel so
>> > that
>> > I
>> > can access the Internet while I'm VPNed in?
>> >
>> > 2. Are users restricted to only 1 session? What I mean by that is can
>> > I
>> > just create a user called Remote or whatever and then have multiple
>> > users
>> > use
>> > that same account?

>>
>>
>>



 
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Gilbert
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Posts: n/a

 
      07-19-2007, 05:56 AM
Yes, IP routing is enabled. There's no routes specified in the Static Routes
section. I've tried to add a static route 0.0.0.0 0.0.0.0 to point to the
default gateway on the LAN (192.168.0.254). I was thinking that the VPN
clients should see that default route in there and route everything to that
ip. It didn't seem to work.

The VPN server's local lan ips are 192.168.0.0-254 (Class C). The pool for
VPN clients is 192.168.251.0-254 (class C).


"Bill Grant" wrote:

> No, you cannot specify a default gateway in that case. If you clear the
> "use default gateway..." switch, the default gateway remains the same as it
> was before, so that you can still access the Internet. Instead you get a
> subnet route to the remote site. Is IP routing enabled on the VPN server so
> that it can route between the LAN subnet and your address pool subnet?
>
> "Gilbert" <(E-Mail Removed)> wrote in message
> news:9511098F-5308-46CC-9F9A-(E-Mail Removed)...
> >I tried that but as soon as I do that, I can't connect to any resources on
> > the remote network.
> >
> > I have a static address pool setup but I didn't see any spot in there
> > where
> > I can specify a default gateway or dns info. (I can only input an address
> > range)
> >
> > "Bill Grant" wrote:
> >
> >> By default a client will have its default gateway set to the VPN
> >> tunnel,so all non-local traffic goes over the VPN link.. To keep your
> >> existing gateway you clear the "use default gateway on remote network" in
> >> the client's connection properties. The client then only gets a subnet
> >> route
> >> through the tunnel. See KB 254231 for more details.
> >>
> >> "Gilbert" <(E-Mail Removed)> wrote in message
> >> news:A70A6A32-1E19-4C80-9D1C-(E-Mail Removed)...
> >> > I'm running a Windows 2003 Small Business Server and I setup remote
> >> > access
> >> > on
> >> > it. I'm using PPTP. I've opened up port 1723 and GRE Protocol 47 to
> >> > be
> >> > forwarded to the server thru the router/firewall. I can connect to the
> >> > server remotely and access internal resources. However, I can't
> >> > Internet
> >> > when I'm VPNed in.
> >> >
> >> > 1. Is there a way to enable split (sometimes called full) tunnel so
> >> > that
> >> > I
> >> > can access the Internet while I'm VPNed in?
> >> >
> >> > 2. Are users restricted to only 1 session? What I mean by that is can
> >> > I
> >> > just create a user called Remote or whatever and then have multiple
> >> > users
> >> > use
> >> > that same account?
> >>
> >>
> >>

>
>
>

 
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Bill Grant
Guest
Posts: n/a

 
      07-19-2007, 11:10 AM
I can't think of any way that you can get this to work with a static pool
of addressses which don't match the LAN IPs. If you read KB 254231 you will
see that the subnet route matches the "received" IP. That means that the
subnet route will be for 192.168.251.0/24 , not 192.168.0.0/24 . So no
traffic for 192.168.0.0 IPs will go across the VPNlink if you clear the "use
default gateway.." switch.

It should work if you use a static pool of addresses from 192.168.0.0
(say 192.168.0.240 to 192.168.0.249) and reserve those IPs in your DHCP
scope.

There is really no way to assign a default gateway or a static route
manually. What would you specify as the IP address of the interface? The
interface doesn't exist until the connection is made.


"Gilbert" <(E-Mail Removed)> wrote in message
news:33565805-DFDC-4A50-9DFE-(E-Mail Removed)...
> Yes, IP routing is enabled. There's no routes specified in the Static
> Routes
> section. I've tried to add a static route 0.0.0.0 0.0.0.0 to point to the
> default gateway on the LAN (192.168.0.254). I was thinking that the VPN
> clients should see that default route in there and route everything to
> that
> ip. It didn't seem to work.
>
> The VPN server's local lan ips are 192.168.0.0-254 (Class C). The pool
> for
> VPN clients is 192.168.251.0-254 (class C).
>
>
> "Bill Grant" wrote:
>
>> No, you cannot specify a default gateway in that case. If you clear
>> the
>> "use default gateway..." switch, the default gateway remains the same as
>> it
>> was before, so that you can still access the Internet. Instead you get a
>> subnet route to the remote site. Is IP routing enabled on the VPN server
>> so
>> that it can route between the LAN subnet and your address pool subnet?
>>
>> "Gilbert" <(E-Mail Removed)> wrote in message
>> news:9511098F-5308-46CC-9F9A-(E-Mail Removed)...
>> >I tried that but as soon as I do that, I can't connect to any resources
>> >on
>> > the remote network.
>> >
>> > I have a static address pool setup but I didn't see any spot in there
>> > where
>> > I can specify a default gateway or dns info. (I can only input an
>> > address
>> > range)
>> >
>> > "Bill Grant" wrote:
>> >
>> >> By default a client will have its default gateway set to the VPN
>> >> tunnel,so all non-local traffic goes over the VPN link.. To keep your
>> >> existing gateway you clear the "use default gateway on remote network"
>> >> in
>> >> the client's connection properties. The client then only gets a subnet
>> >> route
>> >> through the tunnel. See KB 254231 for more details.
>> >>
>> >> "Gilbert" <(E-Mail Removed)> wrote in message
>> >> news:A70A6A32-1E19-4C80-9D1C-(E-Mail Removed)...
>> >> > I'm running a Windows 2003 Small Business Server and I setup remote
>> >> > access
>> >> > on
>> >> > it. I'm using PPTP. I've opened up port 1723 and GRE Protocol 47
>> >> > to
>> >> > be
>> >> > forwarded to the server thru the router/firewall. I can connect to
>> >> > the
>> >> > server remotely and access internal resources. However, I can't
>> >> > Internet
>> >> > when I'm VPNed in.
>> >> >
>> >> > 1. Is there a way to enable split (sometimes called full) tunnel so
>> >> > that
>> >> > I
>> >> > can access the Internet while I'm VPNed in?
>> >> >
>> >> > 2. Are users restricted to only 1 session? What I mean by that is
>> >> > can
>> >> > I
>> >> > just create a user called Remote or whatever and then have multiple
>> >> > users
>> >> > use
>> >> > that same account?
>> >>
>> >>
>> >>

>>
>>
>>



 
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