Use the Appliance Upgrade files to update your XMC appliances such as EMC, NAC and Analytics.
SCP to the IP address of the appliance and transfer the upgrade .bin file to a location on the server.
Make the .bin executable using chmod 755 <bin file>.
Run the bin file
You will need internet access to complete the upgrade so that Ubuntu packages can be updated.
Check release of Ubuntu by typing command lsb_release -a
Edit /etc/network/interfaces file with nano and add dns-nameservers <DNS server> if not present. The EMC and Analytics allow DNS entries in the interfaces file but NAC uses resolvconf package.
On NAC have to use the resolveconf package to setup DNS. Edit /etc/resolvconf/resolv.conf.d/base and enter nameserver <DNS server>.
Sudo resolvconf -u
Bounce the eth0 interface with… sudo ifdown eth0 && sudo ifup eth0
If necessary edit the default route…
ip route del default
ip route add default via <default GW>