IPv6 issues: multiple dhcp6c processes on an interface, random interface ID
-
My problem may be different because it seems to have something to do with my OPT1 (ue0) interface going away and coming back many times an hour:
As hda says, you have a different issue - but one that is somewhat related to that discussed in this thread.
Your issue happens because your USB network interface keeps going down and coming back up. It really would be in your interests to get away from the problem by fixing or changing the interface if possible as an interface really should not be behaving this way.
The root cause is that nothing is terminating the dhcpd / dhcpleases6 / dhcpleases processes when the interface goes down. It may well be that interface_bring_down() (/etc/inc/interfaces.inc from around line 1219) should do this, though it would be important to check for possible side effects before making this change because this function is used in /etc/rc.linkup when a hotpluggable interface goes down (as in your scenario) but also in many other places.