No that’s right. Some dsl modems also are gateways and you can set the MTU on the wan side too, but you don’t want to mess with that.
This is a great article on Double NAT which most people also have if they have their own router / firewall behind their ISP’s router / firewall.
https://blog.udemy.com/double-nat/
It also can cause all kinds of issues with cloud based stuff and routing packets.
Thanks for the link. I’m sure I don’t have a DOUBLE NAT situation here. The Modem I have is a straight cable Modem no firewall or router.
This is off topic for this, but I just noticed my Hue hub intermittently flashes its network light even though it has internet access. I tried a different port on my network to see if maybe that helps.
With all of the changes I’ve made my hue bulbs have become more reliable. They still have problems from time to time with the scene changes, but at least they are turning on/off as expected. Having light is better than having color. Hopefully ST will continue to make things more reliable. Thanks for your help.