I figure that TCP is easy: Add a rule to the forward chain to allow SYN
packets. There's already connection tracking to handle established
connections. Does connection tracking handle UDP? If I allow all UDP
from the LAN interface and one sends a DNS query from LAN to WAN, will
the reply get back? I don't want to blanket authorize all UDP. ICMPv6,
maybe, to allow traceroutes. Unless that's also handled by the tracking
system.
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