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From: AES on 21 Apr 2008 13:19
Couple of questions about an Airport LAN; what can connect to it; and
how one can at least detect (not necessarily identify) who's connected
to it?

We have a DSL connection through a several-year-old Cayman modem/router.
Our DSL provider tells us the modem has an IP address x.y.z.105 (which
can be pinged from outside), and that we're also allocated five add'l IP
addresses x.y.z.106 to x.y.z.110 (which can't be pinged from outside).

Directly plugged into two of the four front-panel Ethernet ports on the
modem/router are an elderly hp 6MP LaserWriter which is Ethernetted
through an equally elderly Farallon EtherMac Print Adapter, and a
WAP-protected (I think it's WAP) Airport Extreme base station which sets
up a household LAN.

1) The LaserWriter is always connected and thus ties up one of the five
IP addresses whenever it or the Farallon is powered up -- right?

2) Five laptops in the house, each of which attempts to get an IP
address via DHCP -- and so sometimes only four of us can get connected
to the LAN, if the LaserWriter is taking the fifth IP address -- right?

3) Elsewhere in the house is an Airport Express, set up as a client to
the Airport LAN, and delivering audio to a stereo system via iTunes.
Does this unit take up another IP address whenever powered up? Or only
when an iTunes on somebody's laptop is talking to it? Or not at all?

4) MacWorld says the HP Photosmart C7280 MFP "all-in-one" is great, and
the HP website says it's Ethernettable, or WIFI-able. Will it tie up
another IP address in one or both of these cases?

5) Will a USB connection through the Airport Express tie up an IP
address?

6) Software that will let us, in some kind of admin mode, look from one
of the laptops out into the LAN and router, and detect at least which of
the five available IP addresses are in use, if not precisely identify
the users?

(Preferably Mac GUI software, rather than some Unix software requiring
use of Terminal -- though I can tackle that if it have to.)

Thanks for any answers . . .
From: Sharon F on 24 Apr 2008 14:10
In article <siegman-A1DCD4.10190921042008(a)nntp.stanford.edu>,
AES <siegman(a)stanford.edu> wrote:

> We have a DSL connection through a several-year-old Cayman modem/router.
> Our DSL provider tells us the modem has an IP address x.y.z.105 (which
> can be pinged from outside), and that we're also allocated five add'l IP
> addresses x.y.z.106 to x.y.z.110 (which can't be pinged from outside).

Are the 5 allocated IP addresses from the DSL provider to be used as
static IPs? If yes, each network device that will be accessing the DSL
service would be configured with a unique IP from that allocation.

May want to check with your provider if "static IP" is how they intended
those addresses to be used or (oddly) if they are limiting you to 5
connections via DHCP. There is a difference - in network configuration
and usually in the pricing of the DSL service as well.

--
Sharon F
From: Clark Martin on 24 Apr 2008 14:52
In article <siegman-A1DCD4.10190921042008(a)nntp.stanford.edu>,
AES <siegman(a)stanford.edu> wrote:

> Couple of questions about an Airport LAN; what can connect to it; and
> how one can at least detect (not necessarily identify) who's connected
> to it?
>
> We have a DSL connection through a several-year-old Cayman modem/router.
> Our DSL provider tells us the modem has an IP address x.y.z.105 (which
> can be pinged from outside), and that we're also allocated five add'l IP
> addresses x.y.z.106 to x.y.z.110 (which can't be pinged from outside).
>
> Directly plugged into two of the four front-panel Ethernet ports on the
> modem/router are an elderly hp 6MP LaserWriter which is Ethernetted
> through an equally elderly Farallon EtherMac Print Adapter, and a
> WAP-protected (I think it's WAP) Airport Extreme base station which sets
> up a household LAN.

It's either WEP or WPA. WPA is better.

>
> 1) The LaserWriter is always connected and thus ties up one of the five
> IP addresses whenever it or the Farallon is powered up -- right?

Nope. The EtherMac won't pass IP nor use it itself.

PS, if it's HP then it's a LaserJet, not a LaserWriter.

>
> 2) Five laptops in the house, each of which attempts to get an IP
> address via DHCP -- and so sometimes only four of us can get connected
> to the LAN, if the LaserWriter is taking the fifth IP address -- right?

If you are indeed limited to five real world IP addresses then odds are
the Airport Extreme Base Station is using the fifth address.

>
> 3) Elsewhere in the house is an Airport Express, set up as a client to
> the Airport LAN, and delivering audio to a stereo system via iTunes.
> Does this unit take up another IP address whenever powered up? Or only
> when an iTunes on somebody's laptop is talking to it? Or not at all?

Yes, it would be using an address and it would use it all the time (else
you couldn't find it when you wanted to use it).

>
> 4) MacWorld says the HP Photosmart C7280 MFP "all-in-one" is great, and
> the HP website says it's Ethernettable, or WIFI-able. Will it tie up
> another IP address in one or both of these cases?

Yes

>
> 5) Will a USB connection through the Airport Express tie up an IP
> address?

No

>
> 6) Software that will let us, in some kind of admin mode, look from one
> of the laptops out into the LAN and router, and detect at least which of
> the five available IP addresses are in use, if not precisely identify
> the users?

The router should be accessible from a web browser.

>
> (Preferably Mac GUI software, rather than some Unix software requiring
> use of Terminal -- though I can tackle that if it have to.)
>
> Thanks for any answers . . .

It sounds like your Airport Extreme Base Station is operating in bridge
mode. If you configure it or the Cayman as a Network Address
Translation (NAT) router you can have all the addresses you'll ever
need. You may be able to configure the Cayman to route the real world
addresses to specific machines if you wish and the rest use NAT
addresses.

--
Clark Martin
Redwood City, CA, USA Macintosh / Internet Consulting

"I'm a designated driver on the Information Super Highway"
From: AES on 24 Apr 2008 15:43
In article
<sharonfDELETE-E46E42.13101624042008(a)newsgroups.comcast.net>,
Sharon F <sharonfDELETE(a)THISmvps.org> wrote:

> In article <siegman-A1DCD4.10190921042008(a)nntp.stanford.edu>,
> AES <siegman(a)stanford.edu> wrote:

> > We have a DSL connection through a several-year-old Cayman modem/router.
> > Our DSL provider tells us the modem has an IP address x.y.z.105 (which
> > can be pinged from outside), and that we're also allocated five add'l IP
> > addresses x.y.z.106 to x.y.z.110 (which can't be pinged from outside).

> Are the 5 allocated IP addresses from the DSL provider to be used as
> static IPs? If yes, each network device that will be accessing the DSL
> service would be configured with a unique IP from that allocation.
>
> May want to check with your provider if "static IP" is how they intended
> those addresses to be used or (oddly) if they are limiting you to 5
> connections via DHCP. There is a difference - in network configuration
> and usually in the pricing of the DSL service as well.

Interesting question. The DSL is provided by local telco, which I guess
is AT&T; their trucks roll for service calls. But its ordered thru
Stanford University; paid for via a Stanford account; and contracted for
by Stanford; and I think it was Stanford who assigned the five IP
numbers. (I've always had the impression that these were somehow
'Stanford-owned' addresses.)

And to further confuse things, I was once told by a Stanford tech that
"No, you're not connected to the Internet _through_ Stanford; you're
'bare-naked on the Internet' (!) and connecting _to_ Stanford." So, I
don't think Stanford is really my ISP (?).

I'm sure the laptops connect to our Airport LAN using DHCP (IPv4), and
the result IP address, for my laptop anyway, as seen in Network prefs,
is one of the 5 allocated numbers.. What the directly connected
LaserWriter/Farallon combination does, God only knows.

Thanks for reply.
From: Sharon F on 24 Apr 2008 16:41
In article <siegman-8FFB0D.12434424042008(a)nntp.stanford.edu>,
AES <siegman(a)stanford.edu> wrote:

> In article
> <sharonfDELETE-E46E42.13101624042008(a)newsgroups.comcast.net>,
> Sharon F <sharonfDELETE(a)THISmvps.org> wrote:
>
> > In article <siegman-A1DCD4.10190921042008(a)nntp.stanford.edu>,
> > AES <siegman(a)stanford.edu> wrote:
>
> > > We have a DSL connection through a several-year-old Cayman modem/router.
> > > Our DSL provider tells us the modem has an IP address x.y.z.105 (which
> > > can be pinged from outside), and that we're also allocated five add'l IP
> > > addresses x.y.z.106 to x.y.z.110 (which can't be pinged from outside).
>
> > Are the 5 allocated IP addresses from the DSL provider to be used as
> > static IPs? If yes, each network device that will be accessing the DSL
> > service would be configured with a unique IP from that allocation.
> >
> > May want to check with your provider if "static IP" is how they intended
> > those addresses to be used or (oddly) if they are limiting you to 5
> > connections via DHCP. There is a difference - in network configuration
> > and usually in the pricing of the DSL service as well.
>
> Interesting question. The DSL is provided by local telco, which I guess
> is AT&T; their trucks roll for service calls. But its ordered thru
> Stanford University; paid for via a Stanford account; and contracted for
> by Stanford; and I think it was Stanford who assigned the five IP
> numbers. (I've always had the impression that these were somehow
> 'Stanford-owned' addresses.)
>
> And to further confuse things, I was once told by a Stanford tech that
> "No, you're not connected to the Internet _through_ Stanford; you're
> 'bare-naked on the Internet' (!) and connecting _to_ Stanford." So, I
> don't think Stanford is really my ISP (?).
>
> I'm sure the laptops connect to our Airport LAN using DHCP (IPv4), and
> the result IP address, for my laptop anyway, as seen in Network prefs,
> is one of the 5 allocated numbers.. What the directly connected
> LaserWriter/Farallon combination does, God only knows.
>
> Thanks for reply.

So you have another element in your network - remote. Only you, Stanford
and, possibly the DSL provider know the exact arrangement and how those
5 IPs are to be utilized. If you run into problems managing all of this,
you may want to sit down with someone that can help you map out your
network. Then help you configure the different parts so that they
interact correctly.

On the other hand - If everything is working okay, then just keep doing
what you're doing. ;)

--
Sharon F
 | 
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Prev: Jaeger LeCoultre Reverso Grande Taille Mechanical 18kt Yellow Gold Mens Watch 270.14.20 - Replica Watch Fake
Next: Other advancements were also being made to improve the durability of the wristwatch. The faces were replace with ones made of synthetic plastic. This made them much more durable and resistant to breaking and cracking. Another advancement was in the d