I got a Wireless Netgear DG834G wireless ADSL router a few week's back and am using Netgear's WG511 wireless PCMCIA card to access the wireless network on Windows XP SP1.
Everything worked fine for about 2 weeks, then for no apparent reason and no configuration change on the router, my VPN access into the corporate network would drop. It happened intermittently, then more frequently. I am using the latest version of firmware for the router. - 1.05
More recently VPN access was not possible at all, the only pointers are LCP packets being dropped by the router - LCP is responsible for establsihing a VPN connection. The client software on Windows XP SP1 for the WG511 card errors also from time to time.
The VPN I am using is the standard MS VPN, not a bespoke solution.
I hard reset the router and reconfigured it. VPN access is still not possible - yet it is fine via my old ADSL USB modem. In addition, if I try to disable DHCP for security reasons on the Internal network and click "Apply" the new settings are not retained. Same goes if I try to change the DHCP scope.
Anyone out there had any joy with this kit and VPNs? There certainly is a lot of complaints out there on the net about it, but seemingly no solution