You should now be connected to the intranet through the switch. The 'Intranet switch' connection might connect automatically, or you may have to select it. Fill the DNS servers field* with some address, e.g.Set Netmask to 255.255.255.0 and leave Gateway blank.The address is for the Ubuntu computer, so it should be different from the other addresses on the intranet. 10.0.0.9), 172.q.r.s, or .z depending on how your intranet is set up. Choose 'Add' next to Addresses, and set Address to some value, either 10.m.n.p (e.g.Under the IPv4 Settings tab, change the Method drop-down to 'Manual'.Choose 'Add', select 'Ethernet', and choose 'Create.'.Choose 'Save.' A duplicate connection may appear in the list choose 'Close' and re-open Network Connections, and the duplicate will be gone (the duplicate item is a bug).Under the IPv4 Settings tab, change the Method drop-down from 'Automatic (DHCP)' to 'Disabled'.Select the 'Wired connection #' corresponding to the Ethernet port that will be connected to the switch.by clicking on the network icon at the upper right and choosing 'Edit Connections.' My question was about setting up network cameras on a local 'intranet' through a switch, so I think the solution might work for you as well: I ended up finding a solution, detailed here:
I ran up against a similar problem in my question here: Access wired network camera(s) through a switch without disconnecting from wireless internet
