shorewall_code/Shorewall/known_problems.txt

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1) On systems running Upstart, shorewall-init cannot reliably secure
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the firewall before interfaces are brought up.
2) The 'local' option in /etc/shorewall6/providers produces an 'ip
route add' command containing an IPv4 address.
3) When optimize level 4 is set, the optimizer mis-handles rules of the
form:
-A <chain1> -j <chain2> -m comment ...
when such a rule is the only rule in a chain.
Workarounds:
1. Don't use optimization level 4; or
2. Remove the comment from the rule.