ifconfig_DEFAULT changed on 14.x?

[Phishfry]

I like to make USB Live Thumbsticks for rescue and repair. I put CPUBurn on it and try and break customers computers.
(Install from FreeBSD USB memstick onto USB stick)

I just made a USB Live stick with 14.1-RELEASE-AMD64 and I am finding the DEFAULT interface behavior has changed.

ifconfig_DEFAULT setting on first boot now adds the machines interface automatically to /etc/rc.conf at the bottom.

Problem is once I reboot it will not assign an IP via DHCP to any interface even though ifconfig_DEFAULT=DHCP and ifconfig_em0=DHCP both now exist in /etc/rc.conf.

I have used multiple interfaces with ifconfig_em$=DHCP before but with ifconfig_DEFAULT it fails here with single interface.

So POLA by adding stuff to my /etc/rc.conf without asking. Then it leaves ifconfig_DEFAULT in place making it fail.
Am I the only one seeing this?

 

[Phishfry]

Example /etc/rc.conf

ifconfig_DEFAULT="DHCP"

reboot and check /etc/rc.conf

ifconfig_DEFAULT="DHCP"
ifconfig_em0="DHCP"

Can't SSH in now. ifconfig shows em0 active no IP assigned.

I enjoy keeping ifconfig_DEFAULT=DHCP for the reason stated above.
This is floater drive to work on stuff.
This worked perfect in past but this is my first 14.x USB build.

 

[Phishfry]

This does appear to be a bug.

I have confirmed the behavior. But....

If you only comment out the inferface It doesn't get triggered.

Example continued from above /etc/rc.conf

ifconfig_DEFAULT="DHCP"
#ifconfig_em0="DHCP"

Ok just for sanity I comment out line I don't want.
Reboot and nothing gets added to /etc/rc.conf.
???
Still no DHCP lease on em0. Floundering. dhclient goes up down some.
Totally remove offending line then reboot and then the "found" interface is added to /etc/rc.conf at bottom.
Nothing in dmesg. I need to check messages to see if this is silent.

Supspect dhclient is triggering something that adds interface to rc.conf.
Some dhclient startup script might be scanning /etc/rc.conf for contents if commenting out does not work.