I have begun installing VLANs on a network. They had a 10.120.0.0/16 network before and it ran on VLAN 5. Printer computers wireless and other devices are on this network that is shared with 12 other building. The default router is in another county hich I have moved to the point of internet access. They have a gigabit connection connecting all the building together.
I am putting a /16 subnet at each building and the whole network will be route able using 10.0.0.0/10.
The building I am currently working on has a network of 10.19.0.0/16. I setup a lab 10.19.19.0/24 and everything is working with DHCP, DNS, Imaging and logging and have statically set the VLANs on the switches, VLAN 25. But the admin here wants to use the network 10.120.5.0 an address on VLAN 5, to go around filters for workstations installing updates and other issue that might a rise with the filters. They need to use this at all the building. There is a route in the firewall that will allow this schema out and forces everyone else to the filters.
The problem is when he put the IP 10.120.5.10 /16 gateway 10.120.1.1 on the machine their are not able to connect. This is do to it being on the VLAN 25. How can their access this schema to go around the filters?
I can setup the route on the firewall but don't want to have to make a block for ever lab to allow unlimit access if someone can figure that out.