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161 posts

Master Geek
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Topic # 109163 13-Sep-2012 14:44
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Hi,

I've read and absorbed all that I can, attempted numerous times but cannot seem to get this to work. This issue could be DD-WRT, QNAP, Android or simply pebcak - so I hope I've selected the correct forum.

Want: To use VPN on Galaxy S3 (unrooted standard) to connect to home network.

At home: DD-WRT v24-sp2 (04/13/11) std (SVN revision 16785) on Buffalo WZR HP AG300H which is bridged to Draytek Vigor 120

NAS: Qnap TS-412 Turbo NAS (3.7.3 Build 20120801)

On the DD-WRT router I can confirm that:

1. PPTP is routed correctly - port 1723 TCP (configured via UPNP on QNAP).
2. VPN Passthrough is enabled.

On the QNAP NAS I can confirm that:

1. PPTP VPN Server is enabled.
2. Authentication: MS-CHAPV2
3. Encryption: AES 128
4. I have configured a vpn user and password.

On the Galaxy S3:

1. The login and password are correct.
2. Type: PPTP
3. PPP encryption (MPPE) is ticked.
4. On 2Degrees.


In the Syslog I have this entry when I attempt to connect
* masked DST IP address
* bob is the dd-wrt router not the qnap.

<4>1 2012-09-13T14:19:50+12:00 bob kernel - - - kernel: [  533.440000] DROP IN=ppp0 OUT= MAC= SRC=118.149.64.50 DST=122.57.***.** LEN=60 TOS=0x00 PREC=0x00 TTL=53 ID=2173 DF PROTO=47

Which is interesting seeing as my IP address is 118.149.114.241 when I use Whatismyip in a browser on the mobile. What is the IP different?

Anyone able to point me in the right direction? What am I missing?

Thank you,
M.


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368 posts

Ultimate Geek
+1 received by user: 1


  Reply # 686504 15-Sep-2012 18:25
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Dude, I share your pain, I've been there done that.

IP protocol 47 is GRE (General Routing Encapsulation) and you'll need to make sure this protocol has access on your path to the NAS which you have enabled as a PPTP server.

An IP protocol should not be confused with a TCP/UDP port 'number' as these represent an access layer one level up.

You'll need IP port 1723 and IP protocol 47 forwarded to the NAS too.

I used Tomato firmware on a Linksys E4200v1, as, well, I could, my router allows it and thus reduces the need to open additional TCP/UDP ports on the NAS. My PPTP 'tunnel' ends at the router.

You may be able to configure a PPTP server on the Buffalo WZR HP AG300H using DD-WRT and thus reduce the requirement for port forwarding.

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