[Bebel]

Hi,

I am having a lot of trouble making connections to outside VPN servers from machines behind my WZR-HP-G300NH router running DD-WRT v24-sp2. The setup is as follows:

Internet--DSL modem--Router--LAN

The problem is as follows: I try to make a connection to VPN servers at my workplace from a machine (any one, Mac or PC) behind my router. I consistently get error 619 and the connection fails.

The DSL modem was originally a 2wire 2701HG-G, but for troubleshooting purposes I replaced it with a "straight" modem. (The 2wire is locked by my ISP and cannot have its routing, DHCP etc. functions disabled, i.e., it can't be put into bridge mode. I swapped it out to exclude it as the source of my problem.) So the modem currently connected is a plain old Thomson SpeedTouch ST516v6 in bridge mode. But the problem is the same in both cases.

HOWEVER, as soon as I put one of my machines in the DMZ, the connection succeeds, no problems at all!

Also, when I had the 2wire modem-router attached, I could plug a machine directly into it (effectively bypassing my DD-WRT router) and the VPN connection would succeed. (I can't do this with the SpeedTouch, obviously, because it doesn't have any spare Ethernet ports, being a plain vanilla modem.)

So it seems to me that all of this implies that the DD-WRT router is not directing VPN traffic properly.

Another bit of information: I seem to remember having a similar problem YEARS ago that I solved, I think, by disabling loopback in DD-WRT (on a WRT54G). But I can't find that setting in v24-sp2.

Finally, I have tried toggling STP and "Filter WAN NAT redirection". Checking Filter WAN NAT redirection seemed to work, for a moment, as I was able to make a connection once or twice, but then it went back to throwing error 619. Since then, nothing seems to work, i.e., I can't make a connection no matter what I do. Maybe the one or two times I was able to connect it was a traffic fluke. I haven't changed much else in the DD-WRT settings since setting up this router a few days ago.

I should also mention that I have tried to connect to 3 different VPN servers. Two are workplace PPTP servers. The third is a PPTP server I set up on an offsite DD-WRT router. I can connect to the third VPN no problem. It's the others that don't work. They all used to work back when I used a WRT54G and another Buffalo router (a WHP-something).

Any ideas?

Thanks very much in advance.

[Bebel]

SOLVED

Reverted to Buffalo Pro Stock firmware (DD-WRT v24SP2-EU-US (08/19/10) std - build 14998) as per instructions given here: http://dd-wrt.com/wiki/index.php/Buffalo_WZR-HP-G300NH.

VPN connections now work as they should.