I have a 3346-ENT with 8.5.1r4 firmware (circa 3/2006). For whatever reason, I noticed that it's showing the time as if daylight savings weren't in effect.
So, looking to see if I have the latest firmware, I discover that the dingbats at Motorola/Google have obliterated the Netopia site and thanks to robots.txt, the fine folks at archive.org don't have it archived.
What was the last firmware revision?
(I guess I can never buy whatever feature upgrades they sold.)
I have the non-ENT version and there is no place to set DST. Given the recent change to DST and the age of these Netopia devices it is unlikely there is firmware available for the current DST schedule.
I just leave mine on Standard time. If you really want correct local time you could adjust GMT timezone offset to correct for DST.