Should read You can create a new update-notification user script
Key word here is "user". Those user scripts have been part of the firmware for years, this is already explained in the documentation.
Can I only use <name> (without dots), or also <name>.asuscomm.com?
The router's FQDN is composed of the device name on the LAN -> LAN IP page, and the domain on the DHCP Server page.
owever, the following OpenVPN 2.4 'Linux ip -6' error
I do not officially support IPv6 with OpenVPN. Far too many architectural changes needed to properly support it, so it's not in the short terms plans.
Also your example update-notification script using curl is easier on the eye rather than my current method of explictly invoking sendmail!
SMTPS support was what drove me to upgrade curl, as in the original curl version it would just segfault. I also liked the syntax, should make it easier for people to adapt it for their own SMTP, if for instance they don't support TLS or authentication (believe it or not, but one of the largest local ISPs still does not support TLS!).
Are these two separate items or are they related? Does the 380.64 version create the reboot issue mentioned and moving back to older components in this build resolves that? Does this mean the wifi drivers were changed (curious about "unusual behaviour, especially regarding wifi")
They're two separate issue. The "reboot three times" is something that has always been part of the firmware (as far as I can remember). What Asus does is at boot time, and only for those models, it checks the state of the radios. If one of the radios isn't on, the router increments an internal counter in nvram, and reboots itself. Once the number of reboots reaches a specific limit (also configured in nvram), then the router just "give up" on trying to resurrect what it thinks is a dead radio, and completes its regular boot. The fact Asus does this only for a few select models makes me suspect that there might have been a design defect in maybe some specific revisions, and they worked around it by just having the router retries to reboot a few times. The problem is, this process doesn't take into account radios that have been disabled by the end user, and therefore it would be normal for these to be disabled at boot time. This translated into a very long boot time for, for example, the RT-AC5300.
The "Administration - Firmware Upgrade" page doesn't seem aligned as before.
In my opinion it was better before.
The previous layout was broken. The hitbox on the checkbox was off by a few pixels as some browsers had issues properly rendering the page. Due to the way Asus designed this page, the only fix was to revert it back to Asus's own design - it was impossible to properly align all fields without redesigning the whole table. CSS workarounds people provided weren't working properly.