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Update Firewall.md

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Make it clear that limit on number of rules only applies prior to R4.0
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@ -48,9 +48,10 @@ in that VM's directory in dom0:
/var/lib/qubes/appvms/<vm-name>/firewall.xml
Please note that there is a 3 kB limit to the size of the `iptables` script.
Please note that there is a 3 kB limit to the size of the `iptables` script in Qubes versions before R4.0.
This equates to somewhere between 35 and 39 rules.
If this limit is exceeded, the qube will not start.
The limit was removed in R4.0.
It is possible to work around this limit by enforcing the rules on the qube itself
by putting appropriate rules in `/rw/config`.