def filterWithExistingRules(existRulesFile, style, tcpRules, udpRules, icmpRules):
existingRuleset = RuleSet()
existingRuleset.initializeFromExistingRuleset(existRulesFile, "pass", style)
print "Filtering Rules with existing ruleset"
tcpRules = testRules(tcpRules, existingRuleset)
udpRules = testRules(udpRules, existingRuleset)
icmpRules = testRules(icmpRules, existingRuleset)
return tcpRules, udpRules, icmpRules
