Need to share pptp vpn on OS 10.6 (NOT SERVER) to other devices on LAN?

Hi there.
I created a PPTP dail-in on a Billion router. I have a user from the UK connecting to it. It connects fine. I have another device that needs to use this tunnel to communicate with something on the other end of the tunnel - thus the Mac will be the gateway.
If I set this up in Windows then I simply share the PPTP connection, set the computer's IP address as the device's gateway and it connects no problem. I've tried the setting "Send everything over the VPN" on the Mac but this didnt help. In fact, this causes the PPTP not to connect at all.
The Mac's IP is 192.168.1.106 (DHCP from their router). The device's IP is 192.168.1.107. Their router's IP is 192.168.1.254. The IP assigned to the Mac when connected to the VPN is 192.168.0.252, with server IP 192.168.0.251 (this is the Billion on the other end). The device on the other end that needs to be connected to is 192.168.0.250.
Thus - I need the device on the UK side, with IP address 192.168.1.107, to connect to the device on the South African side, with IP address 192.168.0.250.
I've actually kind of never used Mac so I've been playing around the last week with it. I am computer literate though and technically minded but I'm not familiar with the way Mac does things. I've been trying to add static routes to the other device on the Mac, hoping this would resolve it. Like I said, I'm pointing the device TO the Mac's internal IP address as its gateway.
I've enable root user and tried various routes / etc but to no avail. There MUST be an easier way of doing this - someone must have wanted to share such a connection on a Mac before...
Please let me know!
Thanks!

You might consider posting this in the proper forum. There is an Xserve forum and an OS X Server forum. Click on Discussions in the menu bar of this page and look for them near the bottom of the list on the right.
There's also a number of help files for configuring VPN. If you go to the main Apple support page, then do a search on 'vpn'.

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    Aug 24 23:44:21 MyArchBox NetworkManager[578]: <info> VPN connection 'MyVPN' (Connect) reply received.
    Aug 24 23:44:21 MyArchBox pppd[1945]: Plugin /usr/lib/pppd/2.4.6/nm-pptp-pppd-plugin.so loaded.
    Aug 24 23:44:21 MyArchBox NetworkManager[578]: Plugin /usr/lib/pppd/2.4.6/nm-pptp-pppd-plugin.so loaded.
    Aug 24 23:44:21 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (plugin_init): initializing
    Aug 24 23:44:21 MyArchBox pppd[1945]: pppd 2.4.6 started by root, uid 0
    Aug 24 23:44:21 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 3 / phase 'serial connection'
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    Aug 24 23:44:21 MyArchBox pppd[1945]: Connect: ppp0 <--> /dev/pts/2
    Aug 24 23:44:21 MyArchBox NetworkManager[578]: Using interface ppp0
    Aug 24 23:44:21 MyArchBox NetworkManager[578]: Connect: ppp0 <--> /dev/pts/2
    Aug 24 23:44:21 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 5 / phase 'establish'
    Aug 24 23:44:21 MyArchBox NetworkManager[578]: <info> (ppp0): new Generic device (driver: 'unknown' ifindex: 10)
    Aug 24 23:44:21 MyArchBox NetworkManager[578]: <info> (ppp0): exported as /org/freedesktop/NetworkManager/Devices/9
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    Aug 24 23:44:21 MyArchBox pptp[1954]: nm-pptp-service-1938 log[ctrlp_disp:pptp_ctrl.c:758]: Received Start Control Connection Reply
    Aug 24 23:44:21 MyArchBox pptp[1954]: nm-pptp-service-1938 log[ctrlp_disp:pptp_ctrl.c:792]: Client connection established.
    Aug 24 23:44:22 MyArchBox pptp[1954]: nm-pptp-service-1938 log[ctrlp_rep:pptp_ctrl.c:258]: Sent control packet type is 7 'Outgoing-Call-Request'
    Aug 24 23:44:22 MyArchBox pptp[1954]: nm-pptp-service-1938 log[ctrlp_disp:pptp_ctrl.c:877]: Received Outgoing Call Reply.
    Aug 24 23:44:22 MyArchBox pptp[1954]: nm-pptp-service-1938 log[ctrlp_disp:pptp_ctrl.c:916]: Outgoing call established (call ID 0, peer's call ID 50048).
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    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (get_credentials): passwd-hook, requesting credentials...
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (get_credentials): got credentials from NetworkManager-pptp
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    Aug 24 23:44:25 MyArchBox NetworkManager[578]: CHAP authentication succeeded
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 8 / phase 'network'
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    Aug 24 23:44:25 MyArchBox NetworkManager[578]: MPPE 128-bit stateless compression enabled
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    Aug 24 23:44:25 MyArchBox pppd[1945]: remote IP address 10.17.10.1
    Aug 24 23:44:25 MyArchBox pppd[1945]: primary   DNS address 10.17.2.22
    Aug 24 23:44:25 MyArchBox pppd[1945]: secondary DNS address 10.17.2.23
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <info> VPN connection 'MyVPN' (IP4 Config Get) reply received from old-style plugin.
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <info> VPN Gateway: 192.168.146.114
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    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <info>   Internal Address: 10.17.10.3
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <info>   Internal Prefix: 32
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <info>   Internal Point-to-Point Address: 10.17.10.1
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <info>   Maximum Segment Size (MSS): 0
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <info>   Static Route: 10.17.0.0/16   Next Hop: 10.17.1.1
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <info>   Forbid Default Route: yes
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <info>   Internal DNS: 10.17.2.22
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <info>   Internal DNS: 10.17.2.23
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <info>   DNS Domain: '(none)'
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <info> No IPv6 configuration
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <error> [1408949065.481618] [platform/nm-linux-platform.c:1716] add_object(): Netlink error adding 10.17.0.0/16 via 10.17.1.1 dev ppp0 metric 1 mss 0 src user: Unspecific failure
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <warn> VPN connection 'MyVPN' did not receive valid IP config information.
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: Cannot determine ethernet address for proxy ARP
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: local  IP address 10.17.10.3
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: remote IP address 10.17.10.1
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: primary   DNS address 10.17.2.22
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: secondary DNS address 10.17.2.23
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 9 / phase 'running'
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (nm_ip_up): ip-up event
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (nm_ip_up): sending Ip4Config to NetworkManager-pptp...
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: PPTP service (IP Config Get) reply received.
    Aug 24 23:44:25 MyArchBox pppd[1945]: Terminating on signal 15
    Aug 24 23:44:25 MyArchBox pppd[1945]: Modem hangup
    Aug 24 23:44:25 MyArchBox pptp[1954]: nm-pptp-service-1938 log[callmgr_main:pptp_callmgr.c:245]: Closing connection (unhandled)
    Aug 24 23:44:25 MyArchBox pptp[1954]: nm-pptp-service-1938 log[ctrlp_rep:pptp_ctrl.c:258]: Sent control packet type is 12 'Call-Clear-Request'
    Aug 24 23:44:25 MyArchBox pptp[1954]: nm-pptp-service-1938 log[call_callback:pptp_callmgr.c:84]: Closing connection (call state)
    Aug 24 23:44:25 MyArchBox pppd[1945]: Connect time 0.0 minutes.
    Aug 24 23:44:25 MyArchBox pppd[1945]: Sent 0 bytes, received 0 bytes.
    Aug 24 23:44:25 MyArchBox pppd[1945]: MPPE disabled
    Aug 24 23:44:25 MyArchBox pppd[1945]: Connection terminated.
    Aug 24 23:44:25 MyArchBox dbus[579]: [system] Rejected send message, 10 matched rules; type="error", sender=":1.51" (uid=0 pid=1938 comm="/usr/lib/networkmanager/nm-pptp-service ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.52" (uid=0 pid=1945 comm="/sbin/pppd pty /sbin/pptp 192.168.146.114 --nolaunc")
    Aug 24 23:44:25 MyArchBox dbus[579]: [system] Rejected send message, 10 matched rules; type="error", sender=":1.51" (uid=0 pid=1938 comm="/usr/lib/networkmanager/nm-pptp-service ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.52" (uid=0 pid=1945 comm="/sbin/pppd pty /sbin/pptp 192.168.146.114 --nolaunc")
    Aug 24 23:44:25 MyArchBox dbus[579]: [system] Rejected send message, 10 matched rules; type="error", sender=":1.51" (uid=0 pid=1938 comm="/usr/lib/networkmanager/nm-pptp-service ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.52" (uid=0 pid=1945 comm="/sbin/pppd pty /sbin/pptp 192.168.146.114 --nolaunc")
    Aug 24 23:44:25 MyArchBox dbus[579]: [system] Rejected send message, 10 matched rules; type="error", sender=":1.51" (uid=0 pid=1938 comm="/usr/lib/networkmanager/nm-pptp-service ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.52" (uid=0 pid=1945 comm="/sbin/pppd pty /sbin/pptp 192.168.146.114 --nolaunc")
    Aug 24 23:44:25 MyArchBox dbus[579]: [system] Rejected send message, 10 matched rules; type="error", sender=":1.51" (uid=0 pid=1938 comm="/usr/lib/networkmanager/nm-pptp-service ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.52" (uid=0 pid=1945 comm="/sbin/pppd pty /sbin/pptp 192.168.146.114 --nolaunc")
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: inet 10.17.0.0/16 table main
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: priority 0x1 protocol static
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: nexthop via 10.17.1.1 dev 10
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <error> [1408949065.487073] [platform/nm-linux-platform.c:2252] link_change(): Netlink error changing link 10:  <DOWN> mtu 0 (1) driver 'unknown' udi '/sys/devices/virtual/net/ppp0': No such device
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: <error> [1408949065.487153] [platform/nm-linux-platform.c:1777] delete_object(): Netlink error deleting 10.17.10.3/32 lft forever pref forever lifetime 1862-0[4294967295,4294967295] dev ppp0 src kernel: No such device (-31)
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: Terminated ppp daemon with PID 1945.
    Aug 24 23:44:25 MyArchBox kernel: Loading kernel module for a network device with CAP_SYS_MODULE (deprecated).  Use CAP_NET_ADMIN and alias netdev- instead.
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: Terminating on signal 15
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: Modem hangup
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 8 / phase 'network'
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: Connect time 0.0 minutes.
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: Sent 0 bytes, received 0 bytes.
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: MPPE disabled
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 10 / phase 'terminate'
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 5 / phase 'establish'
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 5 / phase 'establish'
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 11 / phase 'disconnect'
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: Connection terminated.
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 1 / phase 'dead'
    Aug 24 23:44:25 MyArchBox dbus[579]: [system] Rejected send message, 10 matched rules; type="error", sender=":1.51" (uid=0 pid=1938 comm="/usr/lib/networkmanager/nm-pptp-service ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.52" (uid=0 pid=1945 comm="/sbin/pppd pty /sbin/pptp 192.168.146.114 --nolaunc")
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** Message: nm-pptp-ppp-plugin: (nm_exit_notify): cleaning up
    Aug 24 23:44:25 MyArchBox pppd[1945]: Exit.
    Aug 24 23:44:25 MyArchBox NetworkManager[578]: ** (nm-pptp-service:1938): WARNING **: pppd exited with error code 16
    Aug 24 23:44:45 MyArchBox NetworkManager[578]: <info> VPN service 'pptp' disappeared
    If you've gotten this far, thank you for taking the time to read through all this!  Any help that you can give would be much appreciated.
    Last edited by greyseal96 (2014-08-27 15:20:02)

    Hmm, not sure about the 3.16 series kernel, but I found that when I upgraded to kernel 3.18 the PPTP VPN also stopped working.  This time, though, it was because, for some reason, there was a change in kernel 3.18 where the firewall kernel modules necessary for the VPN don't get loaded so the firewall won't allow some of the PPTP traffic from the remote side back in.  Since the firewall is stateful, these modules need to be loaded so that the firewall can know that the incoming PPTP traffic from the remote side is part of an existing connection.  Here's what my network manager logs looked like:
    NetworkManager[619]: <info> Starting VPN service 'pptp'...
    NetworkManager[619]: <info> VPN service 'pptp' started (org.freedesktop.NetworkManager.pptp), PID 31139
    NetworkManager[619]: <info> VPN service 'pptp' appeared; activating connections
    NetworkManager[619]: <info> VPN connection 'MyVPN' (ConnectInteractive) reply received.
    NetworkManager[619]: <info> VPN plugin state changed: starting (3)
    NetworkManager[619]: ** Message: pppd started with pid 31148
    NetworkManager[619]: <info> VPN connection 'MyVPN' (Connect) reply received.
    pppd[31148]: Plugin /usr/lib/pppd/2.4.7/nm-pptp-pppd-plugin.so loaded.
    NetworkManager[619]: Plugin /usr/lib/pppd/2.4.7/nm-pptp-pppd-plugin.so loaded.
    NetworkManager[619]: ** Message: nm-pptp-ppp-plugin: (plugin_init): initializing
    pppd[31148]: pppd 2.4.7 started by root, uid 0
    NetworkManager[619]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 3 / phase 'serial connection'
    pppd[31148]: Using interface ppp0
    pppd[31148]: Connect: ppp0 <--> /dev/pts/5
    NetworkManager[619]: Using interface ppp0
    NetworkManager[619]: Connect: ppp0 <--> /dev/pts/5
    NetworkManager[619]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 5 / phase 'establish'
    NetworkManager[619]: <info> (ppp0): new Generic device (driver: 'unknown' ifindex: 7)
    NetworkManager[619]: <info> (ppp0): exported as /org/freedesktop/NetworkManager/Devices/6
    pptp[31150]: nm-pptp-service-31139 log[main:pptp.c:333]: The synchronous pptp option is NOT activated
    pptp[31157]: nm-pptp-service-31139 log[ctrlp_rep:pptp_ctrl.c:258]: Sent control packet type is 1 'Start-Control-Connection-Request'
    pptp[31157]: nm-pptp-service-31139 log[ctrlp_disp:pptp_ctrl.c:758]: Received Start Control Connection Reply
    pptp[31157]: nm-pptp-service-31139 log[ctrlp_disp:pptp_ctrl.c:792]: Client connection established.
    pptp[31157]: nm-pptp-service-31139 log[ctrlp_rep:pptp_ctrl.c:258]: Sent control packet type is 7 'Outgoing-Call-Request'
    pptp[31157]: nm-pptp-service-31139 log[ctrlp_disp:pptp_ctrl.c:877]: Received Outgoing Call Reply.
    pptp[31157]: nm-pptp-service-31139 log[ctrlp_disp:pptp_ctrl.c:916]: Outgoing call established (call ID 0, peer's call ID 25344).
    pppd[31148]: LCP: timeout sending Config-Requests <===HERE IS WHERE THE CONNECTION FAILS BECAUSE THE MODULES AREN'T LOADED.
    pppd[31148]: Connection terminated.
    NetworkManager[619]: LCP: timeout sending Config-Requests
    NetworkManager[619]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 11 / phase 'disconnect'
    NetworkManager[619]: Connection terminated.
    NetworkManager[619]: <warn> VPN plugin failed: connect-failed (1)
    NetworkManager[619]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 1 / phase 'dead'
    pppd[31148]: Modem hangup
    pppd[31148]: Exit.
    NetworkManager[619]: <warn> VPN plugin failed: connect-failed (1)
    NetworkManager[619]: Modem hangup
    NetworkManager[619]: ** Message: nm-pptp-ppp-plugin: (nm_exit_notify): cleaning up
    NetworkManager[619]: <warn> VPN plugin failed: connect-failed (1)
    NetworkManager[619]: <info> VPN plugin state changed: stopped (6)
    NetworkManager[619]: <info> VPN plugin state change reason: unknown (0)
    NetworkManager[619]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active.
    NetworkManager[619]: ** (nm-pptp-service:31139): WARNING **: pppd exited with error code 16
    NetworkManager[619]: <info> VPN service 'pptp' disappeared
    To fix this, I had to add a file to the /etc/modules-load.d directory to have the modules loaded into the kernel at boot.  I just created a file called netfilter.conf and put the following in it:
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    nf_conntrack_pptp
    nf_conntrack_proto_gre
    Not sure if this addresses your problem or not, but maybe it's worth a look.

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    My email is live.. roll your mouse over it and talk to me direct..

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