I have a machine behind a NAT gateway, I bridged the IP, now for normal IP it seems to work fine, in fact an nmap -O shows the o/s correctly (openbsd), and shows the open ports. The gateway is a zyxel Prestige 650H/HW-31, I also added static ip routing for protocol 41 to go to an internal IP (ipv4). The o/s setup looks like, gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280 physical address inet 213.94.x.x --> 193.1.31.74 inet6 fe80::260:8ff:fe81:23de%gif0 -> prefixlen 64 scopeid 0x13 inet6 2001:770:100:15::2 -> prefixlen 64 2001:770:100:15::/64 2001:770:100:15::2 UGS 1 1117 - gif0 2001:770:100:15::2 link#19 UHL 2 672 - lo0 I can't ping anything but 2001:770:100:15::2 Any ideas?