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PostPosted: Tue Dec 26, 2006 1:18 am    Post subject: rt31p2 settings for outbound VPN connectivity Reply with quote Back to top

I noticed a few posts describing issues with setting up a VPN server behind an rt31p2. My problem is simpler than that I think. I can't seem to connect to an external VPN server (my work - it seems to hang when attempting to verify login and pw).
My setup is simple: laptop -> rt31p2 -> ISP (verizonFios). The firmware version for the rt31p2 is 1.30.01.

If I replace the rt31p2 with my D-Link DI624, I am able to vpn fine to my work.
For the rt31p2, I have "enabled" the vpn passthrough for pptp as well as for ipsec, and pppoe. Also, per the suggestion of linksys support, I have triggered the ports for 500, 1723, 50, and 47. However that still did not help. Linksys support unfortunately has asked that I go through Vonage to get my firmware upgraded since the router was part of a "Vonage bundle."
I don't want to blindly upgrade the firmware for something that I think should be working with the current version of the firmware.

So, for anyone who is able to successfully use VPN outbound with the rt31p2, could you please tell me what settings if any were made to the router? Or, if someone is familiar with the history of firmware versions for the rt31p2, could you please let me know if there's any chance a firmware upgrade would help?
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PostPosted: Wed Dec 27, 2006 1:11 pm    Post subject: Reply with quote Back to top

IPsec and PPTP VPN Servers will not work behind any of our routers. However normally if a customer is running a VPN Server, then he already has an existing router that he is using the VPN Server behind:

ISP modem g Customer's router g VPN Server

Our routers' (RT31P2, WRT54GP2, WRTP54G, VT1005, and RTP300) do not support forwarding GRE protocols, which is needed to run a normal VPN Server. There are three types of VPN:

IPsec: uses UDP port 500 IP protocol 50 and 51
PPTP: uses TCP Port 1723, IP protocol 47 (GRE)
L2TP: uses UDP Port 1701

GRE (Generic Routing Encapsulation) is at the same level as UDP & TCP, it is NOT a TCP or UDP port. A packet might be a TCP packet or it might be a GRE packet (or one of many other), but it can't be both a GRE AND TCP packet at the same time. The reason that IPsec and PPTP will not work is that alot of Linksys routers will not forward these IP protocols. Most D-links will also not forward these protocols as well (unless the are specifically designed as a VPN router). From what I have read most Netgears do not suffer from this problem.

About GRE: In the most general case, a system has a packet that needs to be encapsulated and delivered to some destination. We will call this the payload packet. The payload is first encapsulated in a GRE packet. The resulting GRE packet can then be encapsulated in some other protocol and then forwarded. We will call this outer protocol the delivery protocol.


Since most customers will already have an existing router that is capable of supporting a VPN Server behind it, simply use the customer's router as the main router and use the Vonage router as a phone adapter:

ISP modem to customer's router to VPN Server to Vonage router

VPN using L2TP will work with our routers (assuming that UDP port 1701 is forwarded) however this type of VPN is not commonly used in the present day and you will not see it very often.

As for the Firm it is still RT31P2_v1.30.01_000_VM_3.1.06_LI_combin_code.bin

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PostPosted: Thu Dec 28, 2006 12:52 pm    Post subject: Reply with quote Back to top

I must have misread some old threads then. I thought as of firmware 1.24.x we could connect to an external VPN from within the local network(which is my scenario), but accessing an internal vpn server from the outside was still a known problem.

So, what you're saying is that the router won't forward GRE packets in "either" direction?

If thats the way it is, thats the way it is I guess.

I do have a DLink router and Netgear router as well. Currently I am using the DLink to connect to the ISP, and the Vonage router (rt31p2) is just being used as an adaptor as you suggest.

I was hoping to utilize the Vonage router to connect me to the ISP because I wanted to take advantage of the QoS capability - we do a lot of downloading, and that affects the voice quality if the download is done from a machine thats not connected to the Vonage router.

Such that, i can't seem to get both my QoS and VPN from any machine. I'd have to set certain machines for downloading (use Vonage router).. and certain machines for vpn (bypass Vonage router).. Not the end of the world, just a little inconvenient for my normal usage.
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