Actually after starting from the create_l3network_fabnet_ipv4ext_manual.ipynb notebook and making the described change I am able to reach the nodes from outside of fabric. So this is likely an issue with my code and I will try to find the delta.
Thanks for your help!
After adding this command to my notebook I can confirm that the route shows up if I check after sshing in, but I still can’t ping the machine using the external IP from a server outside of Fabric.
My slice id is 50ad873b-626c-4e88-9cdc-597d098ff690
From any given VM I can ping the others via their Ext IP. But pings from my local machine to the Ext IPs fail.