Well simple as this , with all correct settings my Windows XP connects fine while with same settings my WRT54G v1 does not connect. In L2TP mode it even get DHCP IP and stuff but wan't connect to L2TP server. In a L2TP it even does not give error message , in PPTP it tries 4 times and give up. (of couse all IPs , passwords and such are 100% correct) Actually problem is not limited to any speciffic firmware , I tried original , HyperWRT and Alchemy too - same problem... After "playing" - investigating a bit windows settings it seems like the problem is that my ISP (that use cable modem btw) have only PAP protocol to be used in both cases without any encriptions while LinkSys always tries to use encription ... But may be I am wrong about it ... Any ideas ?