UDP entries do not list ctstate

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Hi,


to figure out what Netfilter actually does, we add a rule to match 
incoming DNS replies for demonstrational purposes:

	iptables -I INPUT -p udp --sport 53 -m conntrack --ctstate 
	ESTABLISHED

as one would expect, ESTABLISHED matches. Now, after the DNS reply has 
been received, running `conntrack -L | grep udp` does not show the 
string "ESTABLISHED" at all, even if I run it within the UDP conntrack 
timeout. Glitch/Bug in /usr/sbin/conntrack?
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