Just did the upgrade, it work quite well so far. Though I’m not having much on /etc/shorewall/mangle but rule from 80qos_fw template which is:
# 80qos_fw
# save priority packet marks for traffic from the firewall itself
SAVE $FW - - - - - !0x00/0xff
According to Shorewall this rule will:
Move Squid marked packets to the connection mark which such packets are part of.
So far squid marks packets for the first two rules defined in traffic shaping, which is something that should be improved, but that is something for another post.