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dear community members:

I have a fresh install of Ubuntu 12.04 server (x64), and planned using it as a web server within a local network, which has 3 physical locations connected via site-to-site VPN. I have found the NIC card is set up correctly by looking through ifconfig, and able to ping google.com with no issue so the nameserver is also fine.

Problem is: I can only connect to the servere via workstations within the same LAN (192.168.12.x), any computers from other 2 LANs (192.168.11.x and 192.168.16.x) can not connect with the server. It initially connected for a little while, but then all of sudden stopped. I tried to stop fire wall (ufw) and put all AppArmor profiles in complain mode. Still not helping. please help me to direct what to do? thank you!!

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The ping to google is using the default routing and does only show that your internet connection seems to work ;-)

For other local LAN networks you have two possibilities.

different logical LAN on the same physical hardware

If you use different logical LAN on the same physical hardware (e.g. for security reasons), you have to ensure that the used netmask on the interface covers all used LAN addresses.

routing between really different LAN

For this you should know which server is connected to the other (e.g. 192.186.11.*) network and your network.

For this purpose you can use the ip (or the old fashioned route) command. For a permanent solution you have to tweak ether your dhcp server or local network configuration (/etc/network/interfaces).

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