Multi-Tech Systems S000573A User Manual Page 22

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UsingtheRouter’sWebInterface 22
Settingupfirewalls
Definingfirewallrules
Therouter'sfirewallenforcesasetofrulesthatdeterminehowincomingandoutgoingpacketsarehandled.
Bydefault,alloutboundtrafficoriginatingfromtheLANisallowedtopassthroughthefirewall,andall
inboundtrafficoriginatingfromexternalnetworksisdropped.Thiseffectivelycreatesaprotectivebarrier
betweentheLA
Nandallothernetworks.
Addingforwardingrules
ForadevicewithintheLANtobevisiblefromtheinternetorfromanoutsidenetwork,createaforwarding
ruletoallowincomingpacketstoreachthedevice.
1. InthePortForwardinggroup,clickAddRule.
2. Enteranameanddescription.ClickNext.
3. IntheIPF
orwardingDNATpane,enterthefollowing:
IntheExternalWANPortsfield,typetheport(s)tobeforwarded.Commonportsarelistedinthe
field'sattacheddropdownlistandareexposedonceyouenteracharacter.TypeANYtoforwardall
ports.
IntheDestinationLANIPfield,typetheIPaddressofthedevicepacketswillbeforwardedto.The
attacheddropdownlistcontainsDHCPleasedandSavedNetworkaddresses.
IntheDestinationLANPortsfield,typetheporttowhichpacketsaretranslated.Ifthereisarangeof
ports,theendingportisautomaticallyset.TheDestinationLANendingportisbasedonthe
DestinationLANstartingportandtherangeprovidedintheExternalWANPort(s)field.
FromtheProtocoldropdownlist,selecttheprotocolofthemessagesthatcanbeforwarded.
Adefaultfilterallowingforwardedpacketsthroughthefirewallisautomaticallycreated.Ifdesired
youcanusetheAdvancedSettingmodeofthePortForwardingwizardtofurtherrestrictpackets
basedonsourceaddressandsourceports.Inmostcasesthisisnotnecessary.
4. ClickFinish.
AddingOutboundTrafficRules
TopreventadevicewithintheLANfromcommunicatingwithadeviceinanexternalnetwork,arulehastobe
establishedinthefirewalltodroppacketsdestinedtotheexternaldevice.
1. ClickAddRuleintheOutboundTrafficsection.
2. Enteranameanddescription.ClickNext.
3. IntheDestinat
ionIPfield,typetheIPaddressofthedeviceornetworkpacketsarebeingsentto.Type
ANYifthedestinationaddressdoesnotmatter.
4. IntheDestinationMaskfield,typethenetworkmaskofthedestinationnetwork.
5. IntheDestinationPortfield,typetheportpac
ketsaredestinedfor.Commondestinationportsare
listedintheDestinationPortfield'sattacheddropdownlist.TypeANYifthedestinationportdoesnot
matter.
6. IntheSourceIPfield,typetheIPaddressofthedeviceornetworkthatthetrafficoriginatesfrom.Type
ANYifth
esourceaddressdoesnotmatter.
7. IntheSourceMaskfield,typeanetworkmaskfortheoriginofthetraffic.
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