VPN

Hello,

My apologies if this had been answered before, but I could not find anything that appeared to relate to my issues.  For hardware, I am using m0n0walll 1.3b4.  I am running it on a Pentium III, 550MHz, 256MB RAM installed on a IDE hard disk drive.  I have used earlier versions for the past two years.

I had recently lost the ability to use my wireless router, as it died.  While waiting for my replacement, I am using my LAN interface instead of my OPT1 interface.  My network is as follows:

Nortel Contivity 1010 (Work)
  |
  |
Internet
  |
  |
m0n0wall (Home)
  |
  |-LAN Interface (for wired nodes)
  |
  |-wLAN Interface (for wireless nodes)

Using my LAN interface, I can connect to my work's VPN using PPTP, everything authenticates, but no traffic traverses between my laptop, and I cannot "see" any nodes, aside from the Contivity's LAN interface.

Before my wireless router died, I could connect, authenticate, and browse the network at work, but on my LAN I cannot.  The weird thing is, when I plug my laptop into the wLAN interface directly, it still does not work.  I have PPTP passthrough enabled on the wireless router (acting an a AP only).  Are there specific rules I should apply to allow me to connect to the office LAN via PPTP?  I have port 1723 (TCP) and GRE allowed to pass from LAN to WAN, what else needs to be done.  I've seen issues where I should set-up a NAT 1:1 for the laptop, but it worked flawlessly with the wireless router.

Any ideas? Thank you,

Trevor

Perhaps I can better explain what's happening and someone out there can help.

I can connect to the PPTP VPN server at work, it authenticates.  Once connected, no traffic passes through.  I used to be able to do this over my OPT1 interface (wLAN) through a Linksys wireless router configured as an AP.

Am I missing something in my port-forwarding, or outgoing LAN rules?  As stated in my previous message, both GRE and TCP/UDP 1723 are open to pass from LAN to WAN.  The only other thing I see as a potential difference is "PPTP passthrough" was enabled on the Linksys router. 

Please help,

Trevor

OK,  I fixed it.  Turns out the problem was with my subnet mask.  I was using a /8 for my subnet when the other network was also /8.  Even though the other network used 10.0.0.0, and I used 10.200.0.0, the subnet was tripping it up.  Since I only need an absolute maximum of 253 hosts, I switched my LAN to /24 and everything works now.

I hope this helps others who may be fighting with this issue.

Trevor