guest uname -a:
DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026  root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
stock INVARIANTS kernel #0 (X86_64_GENERIC), Jul 2 2026 build
modules loaded at test time: ipfw3.ko, ipfw3_basic.ko, dummynet3.ko (kldload)
net.filters_default_to_accept=1 (set before kldload ipfw3 to avoid default-deny lockout)
ipfw3 rules: see setup.sh (queue <fs> udp ... via lo0)