[Bug 401565] [NEW] No Internet connectivity on NAT client when PPTP VPN connection is active

[Daniel Burton]

Public bug reported:

Binary package hint: guidedog

I am using Guidedog for Internet connection sharing on my Ubuntu 9.04
desktop system, and I am losing all Internet connectivity on my Windows
XP client virtual machine as long as a PPTP VPN connection is active on
Ubuntu machine.  The Windows XP virtual machine is running under
VirtualBox 3.0.2.  It is connected to the host machine using host-only
networking.

I also have a Guarddog firewall configured.  I provide the virtual
machine with DNS, using dnsmasq.  Everything works flawlessly up until
the point when I establish my VPN connection.  After that I cannot ping
Internet hosts or establish TCP connections to them from the Windows XP
virtual machine.  DNS still works, because it is running on the host
system, and connections between the host system and virtual machine are
unaffected.

I have tested this with my Guarddog firewall disabled as well.  The
behavior is exactly the same - I have Internet connectivity up until the
point when I establish the VPN connection, and then I lose it.  After I
disconnect the VPN, I regain Internet connectivity on the client system.

Guidedog does seem to be reconfiguring the iptables rules when the VPN
connection is established or disabled.  After the connection is
established a rule for the interface ppp0, which was not previously
present appears.  When the connection is disabled, this rule disappears
again.

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 9.04
Package: guidedog 1.0.0-5ubuntu1
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: guidedog
Uname: Linux 2.6.28-13-generic i686

** Affects: guidedog (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386

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No Internet connectivity on NAT client when PPTP VPN connection is active
https://bugs.launchpad.net/bugs/401565
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