[moritonal]

To me those aren't technicals. Let's assume that by "routing rules" they implicitly mean IP Routing Rules. So what's swapped, the DNS name of the machines, the machine IP's are swapped or an insert into the ARP table? Does this mean that a live web-socket connection will swap to the new machine, or stay attached to the old one until flushed...

Hey, if you can make sense of it, sure, enjoy. I just know that we had a lot of issues when I used it last and would often beat our head against Kudo to try tracert to other devices to find the machine black-holing requests because the information wasn't shown in the Azure UI.

[giaour]

I've only used this feature with HTTP requests going to a function app, but my understanding was that there is a reverse proxy involved. I have an app with two slots, and both slot domains (<app name>.azurewebsites.net and <app name>-staging.azurewebsites.net) report the same external IP address. You can set up routing rules where a percentage of incoming traffic is forwarded to a specific slot, which would be hard (impossible?) to manage via DNS or ARP tables.