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Grex > Micros > #255: Mac wireless internet networks. | |
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| Author |
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| 25 new of 86 responses total. |
rcurl
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response 58 of 86:
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Apr 18 17:21 UTC 2005 |
Do you know that to be a feature of OS X? There is a syslogd command, but
I don't know enough to set it up to log from the Base Station (if that can
even be done).
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arthurp
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response 59 of 86:
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Apr 21 01:10 UTC 2005 |
Your syslogd should have inherited the feature from its UNIX roots.
Refer to the included manual page for syslogd from a Linux system.
-r This option will enable the facility to receive message from the
network using an internet domain socket with the syslog service
(see services(5)). The default is to not receive any messages
from the network.
This option is introduced in version 1.3 of the sysklogd pack-
age. Please note that the default behavior is the opposite of
how older versions behave, so you might have to turn this on.
I don't know for sure how OS X sets options for services. Linux would
use /etc/sysconfig/syslogd as a text file containing startup options for
syslogd. It may be the same in OS X. I think they use similar rc scripts.
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rcurl
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response 60 of 86:
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Jun 22 16:50 UTC 2005 |
I would appreciate some information about DHCP in IP/TCP. In the Network
dialog in OS X I can implement automatic DHCP, but have no other control
over it except to manually renew the DHCP lease. However in the Airport
Base Station I'm using I can choose the DHCP lease term from minutes to
days. What are the consequences of choosing a lease term? What happens
at the time a lease "expires" (and does its expiration depend upon whether
the computer, or Airport Base, is in use, idle, or off)?
The default lease term on the Airport Base was 4 hours, and on some
occasions I observed I no longer had internet access after my system had
been idle for more than 4 hours. Is this related, or a coincidence, or
what? If the former, how do I get a new lease immediately?
Mac Help is pretty useless in regard to these questions.
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scott
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response 61 of 86:
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Jun 22 20:56 UTC 2005 |
The DHCP lease is something that the DHCP server sets, not the client. For
your application I'd set the lease either off or for many days - a shorter
lease is only useful if you have other clients connecting and needing a lease
from a limited pool of IP addresses.
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rcurl
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response 62 of 86:
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Jun 23 00:42 UTC 2005 |
Makes sense. Now what might I experience at lease expiration if I set the
term for several days (and how does this depend on whether the computers
and/or the Airport router is always on and/or used intermittently)? Or
maybe it is better to ask, what if any conditions of system operation and
lease term setting will lead to any observable consequence of setting a
finite lease term?
It doesn't look like I can set the lease term to zero.
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gull
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response 63 of 86:
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Jun 27 03:47 UTC 2005 |
A lease term of 0 wouldn't make any sense.
The lease term sets how long a client gets to hold onto an IP address
before it has to ask to have it renewed. Setting the lease shorter
means the IP will be available again sooner if the client goes away;
setting it longer means that a client that isn't connected all the
time will have a more stable IP address. It doesn't generally affect
how often the client asks to have the lease renewed, though. My
experience is that Windows machines, for example, will always ask for
a renewal once every five minutes as long as they're online.
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rcurl
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response 64 of 86:
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Jun 27 06:24 UTC 2005 |
I'm trying to understand how this applies in my system, where I have two
computers on a wired LAN that connects to a wireless router. I set the
DHCP lease term on the *router*, which is on most of the time. The
computers are shut down often. When the lease term was set to 4 hours, on
occasion I could not connect from the computers until I had shut
everything down and restarted. Can this behavior be explained with how the
lease system works?
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scott
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response 65 of 86:
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Jun 27 12:01 UTC 2005 |
I don't think you should be losing connection that way.
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gull
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response 66 of 86:
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Jun 27 13:46 UTC 2005 |
I don't think that's related, unless there's a bug somewhere.
All a lease term of 4 hours means is if the router doesn't hear from a
particular computer for 4 hours, it releases that machine's IP address
and may hand it out to another machine if a new request comes in. The
original computer will still get an IP address when it asks for one
again, it just may not be the one it had originally.
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rcurl
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response 67 of 86:
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Jun 27 16:56 UTC 2005 |
Here's what I get for the IP addresses of the various devices:
iMac G4 Bridge Router
10.0.1.2 10.0.1.3 192.168.30.1 10.0.1.1
69.137.222.90
I think that Bridge IP address is for accessing it's software to configure
it (?). The second one for the router is its "Public (WAN) IP address".
The router has a default setting of
"Share a single IP address (using DHCP and NAT)"
with an alternative, not being used of
"Share a range of IP addresses (using only DHCP)"
Does this tell anyone anything about how this system is working (and if
it might lead to a disconnection if the lease term in the router is 4
hours)?
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gull
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response 68 of 86:
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Jun 27 19:44 UTC 2005 |
It looks all right to me. It's a little odd that the bridge's address
isn't in the same subnet, but for bridging purposes that really
shouldn't matter.
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rcurl
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response 69 of 86:
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Jun 30 05:47 UTC 2005 |
How long does it take for the router to get a new IP address at the end of a
lease term? If this can be a significant time, then I would have an increased
probability of being able to connect anew while it is negotiating for a new
lease if the lease term is short (like it was, at 4 hours). I have increased it
to 4 days, and I have not encountered the inability to connect since.
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gull
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response 70 of 86:
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Jun 30 14:10 UTC 2005 |
Usually it doesn't take more than a second or two.
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rcurl
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response 71 of 86:
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Jun 30 15:40 UTC 2005 |
Is it possible for the ISP (Comcast, in this case) to run out of leases?
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juicy
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response 72 of 86:
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Jul 1 01:49 UTC 2005 |
I get the impression that, with Comcast, *any*thing is possible. . . . But
it should be improbable.
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arthurp
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response 73 of 86:
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Jul 16 15:18 UTC 2005 |
Given the 'always on' nature of cable internet, I would call it
unethical to sell more accounts than they have IPs. So in correct
operation it should not be possible for them to run out of leases. But
as juicy says... I've had to debug and solve problems for them on a
couple occasions.
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rcurl
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response 74 of 86:
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Jan 23 21:02 UTC 2008 |
I have a wired Ethernet LAN with two computers (iMac and G4) and a printer
(Brother 2070N), connected with a wireless adapter to an Airport base
station (and from that to a cable router). I can also connect to the
internet through the base station from a Mac laptop. I would like to
*print* with the printer on the LAN from the laptop.
Is this possible and, if so, how?
The Airport Extreme manuals only have information about printing to a USB
printer connected to the base station.
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nharmon
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response 75 of 86:
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Jan 24 00:19 UTC 2008 |
Assuming the airport base station is like other wireless router/access
points, the laptop should already be on the same network as the
workstations and printer.
Have you tried pinging the printer from the laptop?
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rcurl
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response 76 of 86:
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Jan 24 01:58 UTC 2008 |
From termimal? Using its DHCP IP address? I thought this was all built into
OSX. The Printer Browser on the laptop shows the printer, but gives no
location for it. (I'm in the dummy class for a lot of these networking details
so I need help.)
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nharmon
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response 77 of 86:
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Jan 24 04:37 UTC 2008 |
I would think you should be able to access the printer like you would
from the PCs. What kind of location information do the PCs give?
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rcurl
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response 78 of 86:
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Jan 24 04:58 UTC 2008 |
I got it to work with the DHCP IP address. The Mac Help helped but the
procedure is not intuitive. What led me astray is that when I installed
the printer software, it showed up in the printer selection menu, which I
thought meant that it saw the printer. But no: one has still to Add the
printer and give it an arbitrary name and location. There is then an
obscure menu, which is hard to find, where one chooses the make and model
of the printer (there are hundreds listed!).
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nharmon
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response 79 of 86:
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Jan 24 05:16 UTC 2008 |
Well, as unintuitive as it might have seemed, I can assure you it would
have been much more confusing in Windows. :)
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nharmon
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response 80 of 86:
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Jan 24 05:20 UTC 2008 |
Case in point: My networked laser printer is in the basement while my
windows PC is on the 2nd floor. If I add the printer to the windows PC,
the "add printer wizard" asks if it is a local or network printer. You
have to answer "local" in order to install it.
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rcurl
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response 81 of 86:
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Jan 24 22:10 UTC 2008 |
Another problem I had while trying to get to print across the network was that
my wife was watching streaming video on the wired LAN while I was trying to
print wirelessly from the laptop, which so jammed he pipe that none of my
packets got to the printer until she shut down.
I'm now wondering if I even had to install the printer driver on the
laotop, since one of the steps in adding the printer was selecting a make
and model from a dialog. Does OS 10.4 already have printer drivers?
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arthurp
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response 82 of 86:
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Jan 27 23:43 UTC 2008 |
Often there is a list of printers for you to install. And often the
printer you have is not in that list until you install the software that
came with it.
Just to add some complexity here, if you can figure out how to force the
base station to assign the same IP every time, or how to assign to the
printer a static IP on the same network segment but outside the DHCP
range, you may save yourself some trouble later on if the base station
should ever decide to assign a different IP to the printer. Or you
could just remember that this is a possibility and if the printer every
mysteriously stops working start by checking what IP it is using.
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