2 NIC chrooted Fat Client NAT Problems

Hello!

Thanks for all the work and great information out there already -- I've
worked through a ton of the resources out there along the way of trying to
fix this, but none of it seems to work.

I went back to square one and have installed everything clean from the wiki
tutorial, but still running into the same problems: I can't get my clients
to connect to anything beyond the WAN facing NIC on the Server.

All of this is running in Ubuntu 18.04 on Virtual Machines (the server will
stay Virtual, clients will be deployed into a school lab with amd64
terminals). The network adaptors are attached in Bridge mode, on the same
ethernet, and using virtio-net on the Server, and in Bridge mode as an
Intel1000 on the Client.

I really appreciate any help!

Here's the contents of my /etc/netplan .yaml (not sure if the routes help,
but on an earlier machine configuration, they were part of getting it to
work before things went the other direction):

network:
     version: 2
     renderer: networkd
     ethernets:
         enp0s3:
              addresses:
               - 192.168.2.50/24
               gateway4: 192.168.2.1
               nameservers:
                   addresses: [127.0.0.53, 192.168.2.1, 192.168.1.1,
1.1.1.1]
                routes:
                    - to: 192.168.2.0/24
                      from: 192.168.67.0/24
                      via: 192.168.2.50

        enp0s8:
             addresses:
             - 192.168.67.1/24
             nameservers:
                  addresses: [127.0.0.53, 192.168.2.1, 192.168.1.1, 1.1.1.1]
             routes:
              - to: 192.168.67.0/24
                from: 192.168.2.1
                via: 192.168.2.50

I also have dnsmasq set with --no-proxy-dhcp, and net.ipv4.ip_forward=1 in
/etc/sysctl.conf.

Any other settings anyone wants to see, I can share -- or if there are some
good checks I should be running to try and follow traffic beyond just
'ping', I'd really appreciate learning how to track what's going on here
better.

Thanks again for all the help that's already out there!

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