fix: iptables existence #70
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iptables existence check fixed and using it is optional
add exception handling for rexmit raise more decriptive error message if iptables is not installed
fix typo in iptables existence error
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There was a a problem on exception handling for
iptablesexistence check routine which is fixedAlso using
iptableshas been made optional as some systems may have other type of firewallNow only if user ask for auto config of
iptablesand it doesn't exist app crashes with error, otherwise it assumes user has no problem about auto RST response of linux