does "iptables -t filter -A INPUT --match conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT" gives a false sense of security ?

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I misconfigured my Gentoo iptables script and could therefore not download source code archives via ftp. I "repaired" that script and restarted it - ftp was possible. After a reboot however ftp won't work again. I realized that probably a parallel Gentoo emerge job jumped into the restart sequence of the iptables script and therefore the ftp download could be finished.

Now I'm wondering if this is a "works as desigend" feature and how this racy mischance can be avoided.

-- 
Toralf
pgp key: 0076 E94E

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