Adder Technology AdderView CATxIP 1000 Manuale Utente
Ports
If.you.accept.the.analogy.of.
.being.rather.like.telephone.numbers,.
then.think.of.ports.as.extension.numbers..In.a.company.of.any.size,.you.
generally.wouldn’t.expect.the.accounts.department.to.share.the.same.telephone.
with.the.technical.department..Although.their.calls.may.all.be.related.to.the.
same.company,.they.concern.very.different.aspects.of.that.company..
It.is.the.same.with.IP.network.connections..Although.you.have.only.one.network.
link.into.your.computer.and.only.one.IP.address.(phone.number),.you.are.
probably.performing.many.different.tasks.through.that.one.link,.often.at.the.
same.time..Thus,.when.you.browse.the.web.your.outgoing.requests.and.the.
incoming.information.are.all.channelled.through.port.80..When.you.send.an.
email,.it.travels.through.port.25.and.when.you.transfer.files.you.are,.without.
knowing.it,.using.port.20.
At.the.“border.crossing”.between.the.wider.Internet.and.every.local.network.
attached.to.it,.there.is.a.router.that.is.usually.combined.with.a.firewall..One.of.
its.main.tasks.is.to.direct.incoming.traffic.to.the.correct.place.within.its.local.
network..A.key.piece.of.information.to.help.it.do.this.is.the.port.number:.
generally.wouldn’t.expect.the.accounts.department.to.share.the.same.telephone.
with.the.technical.department..Although.their.calls.may.all.be.related.to.the.
same.company,.they.concern.very.different.aspects.of.that.company..
It.is.the.same.with.IP.network.connections..Although.you.have.only.one.network.
link.into.your.computer.and.only.one.IP.address.(phone.number),.you.are.
probably.performing.many.different.tasks.through.that.one.link,.often.at.the.
same.time..Thus,.when.you.browse.the.web.your.outgoing.requests.and.the.
incoming.information.are.all.channelled.through.port.80..When.you.send.an.
email,.it.travels.through.port.25.and.when.you.transfer.files.you.are,.without.
knowing.it,.using.port.20.
At.the.“border.crossing”.between.the.wider.Internet.and.every.local.network.
attached.to.it,.there.is.a.router.that.is.usually.combined.with.a.firewall..One.of.
its.main.tasks.is.to.direct.incoming.traffic.to.the.correct.place.within.its.local.
network..A.key.piece.of.information.to.help.it.do.this.is.the.port.number:.
Security issues with ports
The.settings.of.port.numbers.become.important.when.the.AdderView.CATxIP.
1000.is.situated.behind.a.network.firewall..In.order.for.a.remote.VNC.viewer.or.
web.browser.to.make.contact.with.your.AdderView.CATxIP.1000,.it.is.necessary.
for.the.firewall.to.allow.communication.through.a.particular.numbered.port.to.
occur..
One.specific.function.of.firewalls.is.to.restrict.access.to.ports.in.order.to.prevent.
malicious.attackers.using.them.as.a.route.into.your.network..Every.new.port.
that.is.opened.offers.a.new.possibility.for.hackers.and.so.the.number.of.
accessible.ports.is.purposefully.kept.to.a.minimum..In.such.cases,.it.may.be.
advantageous.to.change.one.or.both.AdderView.CATxIP.1000.ports.to.use.the.
same.number..The.other.alternative.is.to.place.the.AdderView.CATxIP.1000.unit.
outside.the.firewall.and.take.full.advantage.of.its.secure.operation.features.–.see.
1000.is.situated.behind.a.network.firewall..In.order.for.a.remote.VNC.viewer.or.
web.browser.to.make.contact.with.your.AdderView.CATxIP.1000,.it.is.necessary.
for.the.firewall.to.allow.communication.through.a.particular.numbered.port.to.
occur..
One.specific.function.of.firewalls.is.to.restrict.access.to.ports.in.order.to.prevent.
malicious.attackers.using.them.as.a.route.into.your.network..Every.new.port.
that.is.opened.offers.a.new.possibility.for.hackers.and.so.the.number.of.
accessible.ports.is.purposefully.kept.to.a.minimum..In.such.cases,.it.may.be.
advantageous.to.change.one.or.both.AdderView.CATxIP.1000.ports.to.use.the.
same.number..The.other.alternative.is.to.place.the.AdderView.CATxIP.1000.unit.
outside.the.firewall.and.take.full.advantage.of.its.secure.operation.features.–.see.
.for.details.
IMPORTANT: The correct configuration of routers and firewalls requires
advanced networking skills and intimate knowledge of the particular network.
Adder Technology cannot provide specific advice on how to configure your
network devices and strongly recommend that such tasks are carried out by a
advanced networking skills and intimate knowledge of the particular network.
Adder Technology cannot provide specific advice on how to configure your
network devices and strongly recommend that such tasks are carried out by a
LOC REM VNC 100
LNK PWR
www.adder.com
Internet
Web server
AdderView.CATxIP.1000.
has.the.local.IP.address:.
192.168.0.3
has.the.local.IP.address:.
192.168.0.3
User.with.VNC.viewer.accesses.
IP.address:.129.7.1.10.(this.
automatically.uses.port.5900)..
IP.address:.129.7.1.10.(this.
automatically.uses.port.5900)..
Router/firewall address: ...0
Router.is.programmed.to.send.port.5900.
VNC.traffic.to.local.address.192.168.0.3.
and.port.80.web.traffic.to.local.address.
192.168.0.42
.
VNC.traffic.to.local.address.192.168.0.3.
and.port.80.web.traffic.to.local.address.
192.168.0.42
.
User.accesses.the.company.
website.at:.129.7.1.10.(this.
automatically.uses.port.80)..
website.at:.129.7.1.10.(this.
automatically.uses.port.80)..
Web.server.has.the.local.
IP.address:.192.168.0.42
IP.address:.192.168.0.42