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Does outgoing PPTP blocks incoming PPTP?

client 1:
connecting from: 219.88.65.32
connecting to: 222.23.53.32
status: connected via PPTP VPN tunnelling

client 2:
connecting from: 222.23.53.32
connecting to: 219.88.65.32
status: trying to connect via PPTP VPN but is always failing ... "No response from host"

While client 1 is connected, client 2 is trying to connect to the site where client 1 is, and it is failing.  can PPTP handle both incoming connection outgoing connection between two sites at the same time?
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mpdctech
Asked:
mpdctech
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1 Solution
 
debuggerauCommented:
sure can, the host port is different from the destination port.

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Rob WilliamsCommented:
No I don't believe it can. It can handle incoming and out going to different sites, but you are trying to create two tunnels between the same two sites. Even if they would connect there would be severe routing issues.
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debuggerauCommented:
yes, that's true Rob, but routing is not a feature of pptp and pptp doesn't affect the functionality of routing.
http://tools.ietf.org/html/rfc2637

But I agree, its erroneous to set it up this way.

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Rob WilliamsCommented:
My assumption would be that both VPNs have a different gateway address but with the same remote subnet. Which route/VPN would the packets take?
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mpdctechAuthor Commented:
With PPTP in mind, how does a site-to-site VPN work using PPTP?
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Rob WilliamsCommented:
Not sure I understand the question.
Generally a site-to-site tunnel is done these days with 2 VPN routers. VPN routers these days are so inexpensive (starting at $150) that the labor costs, lack of stability, and slightly reduced performance make site-to-site VPN's using servers almost obsolete. Configuring site-to-site with 2 servers is very time consuming. The routers would normally uses IPSec which is more secure but some can be configured to use PPTP.
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