1)  On systems running Upstart, shorewall-init cannot reliably secure
    the firewall before interfaces are brought up.

2)  The Shorewall Init installer (install.sh) fails on Gentoo systems.

    Corrected in Shorewall 4.5.21.1.

3)  The installers (install.sh) fail to start the products at boot time
    on Debian and derivatives. This problem was introduced in Shorewall
    4.5.21.

    Corrected in Shorewall 4.5.21.1.

4)  Multiple ICMP/ICMP6 types listed in a rule result in a Perl runtime
    error on the compiler.

    Corrected in Shorewall 4.5.21.1.

5)  An attempt to specify RAS or Q.931 in the HELPER column is rejected
    with an error.

    Corrected in Shorewall 4.5.21.1.

6) The 'nohostroute' provider option does not suppress the addition of
   a host route in the default routing table when USE_DEFAULT_RT=Yes.

   Corrected in Shorewall 4.5.21.1.
