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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Appendix 6 – Special Operational Modes 320

Portforwardingisbasicallytellingtherouterthatwhenitreceivespacketsfrom

theWideAreaNetworkonagivenport,fromthosepacketsshouldbe

forwardedtransparentlytothespecifiedaddressontheLocalAreaNetwork.

NAT

(NetworkAddressTranslation)

Thisisaschemebywhichaprivatenetworkcanmakeconnectionsintoapublic

network(suchastheInternet)usingonlyoneaddressonthepublicnet.An

exampleishaving3computersbehindarouter/firewallonaresidentialDSLline.

Thethreecomputershaveseparateaddressesonth

elocalnetwork,butonly

theRouter'sWANIPisvisibleontheouternetwork.

NATworksbecausetherouterknowstheformatofTCP/IPpackets.Itcan

substituteitsownIPintothepacketsthatareoutbound,thenreinsertthe

properLANIPwhenapacketcomesinboundfromtheWAN.Thi

sworks

becauseTCPisconnection‐based,sotherouterknowsthatalltrafficonagiven

connectionisdestinedforthemachinethatinitiatedit.

THE ZEPHYR XSTREAM BEHIND A FIREWALL

Inourworld,wewillalwayshaveastudiocodecandaremotecodecsotherearealwaystwo

Xstreamstoconsider.Forthisdis

cussion,we'llassumethattheremoteZephyrXstreamis

properlyconfiguredalready.Thatway,weonlyneedtodiscusstheconsiderationsforthelocal

machine.Ifeachoperatordoesthis,bothcodecswillendupbeingconfiguredproperly.

Tobegin,forallofthescenariospresentedbelow,thefollowingp

rocedureshouldbefollowed:

• GivetheZephyrafixedIPaddressontheLAN.Usually,thisisdonebysimplypickingan

unusedaddress.

• SettheLANsubnetmask(usually255.255.255.0‐getthesenumbersfromtheIT

administrator)

• SetthegatewaytotheLANaddressoftherouter

• SettheDNStotheserverspecifie

dintheWAN/DHCPareaoftherouter'sinformation

pages(optional).



HTTPMode Notrecommendedforuseoverthepublicnetwork.Ifit'sbehindarouter,it

reallyshouldn'tbeused.

RTPMode

Sending

AfterconfiguringtheXstreamasabove,therearenospecialsettingsrequiredtosendan

RTPstreamonly.TaketheIPaddressgiventoyoubythepersonyou'recalling.Press

Dial.EntertheIPaddress.PressDialagain.

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