Reverting the attempt at fixing the firewall rules that are flushed by the DPI engine since other things related to DPI are completely breaking the NAT loopback code - both mine and Asus's own).
Revert "dpi: when the closed-source DPI engine restarts, it flushes part of the iptables, breaking the NAT loopback and probably other things as well.  This is an attempt to reapply all firewall rules in those DPI restart calls I was able to intercept in the open-source parts.  Unsure if these are enough."

This reverts commit 4a431885671ee5c045d2a9985835127b1de42fd0.