When connected to VPN (I have used OpenVPN and TunnelBear VPN service) nmap stops working. Ping, nc and other network tools work however nmap doesnt.
When not running vpn, I get:
$ sudo nmap 18.104.22.168 Starting Nmap 5.51 ( http://nmap.org ) at 2011-12-07 15:38 CST Nmap scan report for google-public-dns-a.google.com (22.214.171.124) Host is up (0.082s latency). Not shown: 998 filtered ports PORT STATE SERVICE 53/tcp open domain 113/tcp closed auth
When running over vpn, I get the following:
$ sudo nmap 126.96.36.199 Starting Nmap 5.51 ( http://nmap.org ) at 2011-12-07 15:08 CST Note: Host seems down. If it is really up, but blocking our ping probes, try -Pn Nmap done: 1 IP address (0 hosts up) scanned in 3.07 seconds
It is like nmap loses the traffic. Doing tcpdump captures shows that the traffic is making it back to the box.
Any mac osx, OpenVPN or nmap experts have an idea?
I am using the latest macports nmap...