I notice that you haven't created the VLAN interface on the host machine before running the docker-composefile. You need to create the VLAN interface using the ip link command. You can ping the IP address from within the container but not from the ho...
You need a service contract with Cisco to download the anyconnect client, sadly the free version which used to be downloadable for the sandbox of anyconnect is longer there. Many folks use openconnect with the sandbox, as you do not have a contract, ...
@pbiggs suggest to try this after the planned work which is taking place tomorrow (26th Aug) this might be one of the fixes taking place - but i am guessing here.
Hope this helps.
Cool, the only thing i thought of was not including the domain in the username string and setting this up as seperate field to specify the domain in the tesbed file.... But guessing here, as i have nothing to test on.