We are running a mixed environment of windows & ubuntu (12.04 server) primarily for a postgresql based application.
On the LAN everything works fine. The problems come with trying to access remotely over an IPSEC VPN.
We can access all of the windows based servers with no problem at all - the ubuntu based machines are completely invisible and it is impossible to connect to them. Ping comes back as destination unreachable (both to and from the ubuntu machines) but works fine to and from all windows machines. (All machines are correctly registered in DNS & WINS)
Have done sudo ufw disable to try and ensure no firewall issue, both the windows servers and the ubuntu servers receive address via DHCP so network config should be consistent. I assume that as the windows communication works that it is not a VPN issue but am unable to work out what is making the ubuntu box invisible (even nmap is unable to get a response) I am sure it must be somthing obvious - just not sure what!
Not sure if relevant but all the windows & ubuntu servers are running under ESXi 5.0
Any help appreciated.