Re: Can't Access Printer!!!

On Mon, 14 Jul 2008 23:26:53 -0400, gmark wrote
(in article
<a3f91769-4b30-4963-bd3f-fa6c9d15e50d@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>):

On Jul 14, 6:11 pm, gmark <gm...@xxxxxxx> wrote:
On Jul 14, 5:39 pm, Chris Ridd <chrisr...@xxxxxxx> wrote:



On 2008-07-14 22:02:46 +0100,gmark<gm...@xxxxxxx> said:

On Jul 14, 9:00 am, J.J. O'Shea <try.not...@xxxxxxxxxxx> wrote:
On Mon, 14 Jul 2008 04:54:00 -0400,gmarkwrote
(in article
<5015038f-5333-4786-8381-a22be41bf...@xxxxxxxxxxxxxxxxxxxxxxxxxxx>):

I've got a cable modem which goes to a router, which is, in turn,
connected via ethernet cables to a hub upstairs which goes to two
macs.  My macbook is in the downstairs office, and connects to the we
b
via an airport link.  That link -- via a Netgear WPN824 -- connects
via ethernet cables to the upstairs hub.

I used to be able to access my Color Laserjet HP 2605 flawlessly, but
no more.  I thought having the entire IP address of theprinterwould
allow me to access it, regardless of the IP address theprinterwas
assigned after resetting. Now, jobs just get rejected from my Macbook,
even though the computers upstairs have no problem accessing the
printer.

Any ideas?

What is the _exact_ error message?

All the information is below.  I don't see why I can't access this
printerwith the full IP address -- I suppose the router is the
problem -- maybe the subnet mask?  I really appreciate any help.  I've
been unsuccessful reading all sorts of IP troubleshooting material off
the web, so it might be something basic and trivial enough that they
just don't bother touching on it.  Don't hold back any details, no
matter how obvious it may see  to you.

Thanks!! (data below)

[...]

Main Router (off cable modem)
-------------------
MAC Address:  00-15-e9-79-ac-f6
IP Address:  192.168.0.1
Subnet Mask:  255.255.255.0
DHCP Server:  Enable

[...]

Color Laser HP 2605dn (off Main Router)
-------------------
IP Address:  169.254.23.24
Subnet Mask:  255.255.0.0
Default gateway:  169.254.23.24

There's your problem - theprinter'susing a link-local IP address that
is outside of the subnet of your main router, so it is routing
yourprinterconnection attempts to your ISP instead.

I would reconfigure theprinterso that it has a 192.168.0.x IP address.

I tried that -- last set it to 192.168.0.103/102/148 -- none of which
worked. Is it possible that thatprinter(or some attached system) has
to explicitly do something to make the system aware of the new IP?
I'd heard that theprinteritself had to request a DHCP update.

If I have the actual, complete IP address of theprinter(as I do,
obviously), why can't the router find thatprinter?  Does the router
automatically limit accesses to some subnet, and is that subnet
defined by the mask?  And if so, does the router or theprinterhave
to be forced to make an update?

Thanks!

Mark

As an aside, I've been looking over the web for a good summary of IP
networks -- DHCP, NAT, etc. -- and it doesn't seem there's one to be
found. They all seem to be missing the "summary" part.

Anyone have any recommendations?

Thx!

DHCP is fairly simple. A DHCP server automatically assigns IP addresses to
nodes (printers, computers, etc.) attached to it, by Ethernet or by wireless.
These addresses are assigned from out of the DHCP pool. Private networks,
such as yours, usually use DHCP pools from one of the three private address
ranges: Class A, 10.x.x.y, where 'x' is 0 to 255 and 'y' is 1 to 254; Class B
172.16.x.y to 172.31.x.y, and Class C, 192.168.x.y. That's one Class A range,
16.8 million IPs, plus 16 Class B ranges, 65 thousand IPs each, and 256 Class
C ranges, 254 IPs each. Typically the router is assigned either the very
first or the very last available IP, something like 192.168.0.1 or
192.168.0.254. (192.168.0.0 is the 'network' IP, and is reserved;
192.168.0.255 is the 'broadcast' IP, and is also reserved.) You can restrict
the size of the DHCP pool; on my network, I have blocked off the first 50
IPs, for use as fixed IPs if necessary. (This is called 'excluding' IPs.) You
can tell the DHCP server to always give a certain IP to a certain device;
this is called 'reserving' an IP. On my home net, my server and my network
printers are all assigned fixed IPs from the excluded block. My workstations
all have reserved IPs. (The office net also has the servers and printers
given fixed IPs, but there's no way that I'd go to the trouble of reserving
IPs for all the workstations, there's far too many of them.)

If I were you I'd exclude a block of IPs from the DHCP pool generated by your
Netgear, and assign one IP to the printer, but would let the Netgear hand out
IPs using DHCP to all your computers.

NAT is also fairly simple. What it does is it uses your router so that your
entire local network pretends to be just one IP on the Internet. The router
has a WAN IP (in your case, 24.15.121.159) and is set up as a gateway using
the address 192.168.0.1 on your local net. Any device which is on the local
net and which knows the address of the gateway can use the gateway to connect
to the Internet. The Internet sees only the gateway. You could have all 254
nodes of a Class C private network set up behind the gateway, and the only
evidence that might point that way would be the traffic going in and out of
the gateway. The router knows which local device made which request, so it
knows where to send the reply when it gets it.

--
email to oshea dot j dot j at gmail dot com.

.

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