Mailinglist Archive: opensuse (1432 mails)
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Re: [opensuse] internet MAC address
- From: j debert <jdebert@xxxxxxxxxx>
- Date: Mon, 03 Nov 2008 08:24:09 -0800
- Message-id: <490F25A9.5080400@xxxxxxxxxx>
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Richard さんは書きました:
| I have been having intermittant connectivity problems, so started
trying to
| fix like an auto mechanic: replace a part at a time and see what
works.
| Router is linksys, fairly new so not suspicious. Cable modem was
maybe 5-6
| years old or more, so replaced that. Not much change, still lose
| connectivity at an odd time, nothing can get me back up, then some
hours
| later, voila!, I am back on...so rush to get out emails, or
questions like
| this while possible. New cable modem has new MAC address, which I
registered
| with ISP, but am not sure how to re-set in SUSE 11. On the one
hand, I am
| online now, but check with eth0 in YAST, Network Devices, shows old MAC
| address. I assume I can manually change in a file probably in /etc,
but I
| did not find one that seemed obvious. Any suggestions?
|
You did not mention whether or not you are using wireless router.
Doesn't much matter, really...
The method of replacing things one at a time doesn't really work well
for this kind of stuff. Most car parts aren't configurable and don't
have firmware, etc. So replacing the hardware does not necessarily
mean that the programming and setup will also change. For such stuff,
observation, snooping, divide and conquer, experimentation,
programming, research and a bit of skull sweat works better and
generally costs less.
What do the status lights on the cable modem indicate? Is there a
change when the problem occurs? Are your using clean, preferably new
RG6 or better coax to your cable modem? Does the entire house have
RG6, from the drop or poe (point-of-entry) and to every single point
in the house? Is there any coax that is being bent into a sharp turn,
especially at connectors? Are you using high-quality F-connectors? Are
there any cheap connectors or fittings anywhere--including any that
_look_ cheap? Are any fittings or connectors loose? What happens if
you shake any loose cables anywhere in and around the house? Is it
more likely to occur when the TV is on? Perfect cabling is not
essential but it helps a great deal. Ready-made cable tends to be
poorer quality than the average, custom-made-on-the-spot
hand-terminated cable, though you can buy good or better quality
ready-made cable at insanely excessive prices.
Your cable modem is connected to the router? Then you don't need to
change anything on your box. Unless you are not using dhcp and have it
set up on your router, or haven't set a default route, set up
/etc/resolv.conf, etc., etc.
How do you know it's not your router? Is your router correctly
configured for the cable modem, including MAC cloning? Or does your
cable modem not require MAC cloning? Is dhcp working properly and
consistently? Does your router have the latest firmware version? Have
you checked with Linksys to see if your router has any known bugs or
problems? Even new routers have problems. You can probably find out
more by trying a different router--different brand and model--or by by
looking at the traffic between the router and modem.
Do you have other boxen on the LAN that have the same problem?
If you connect your box directly to the cable modem, with it correctly
configured, can you see any packets coming from the cable modem using
wireshark? Normally you would see lots of arp and broadcast traffic.
If you can't connect directly to the cable modem, do you have a hub
that you can put between the cable modem and router? (Using a hub this
way will help tell you whether or not both the cable modem and the
router are working.) If so, you can plug in your box (or another) and
use wireshark to look at the traffic between the router and cable
modem. This requires a _hub_, /not/ a switch. A couple things to look
for are 1) that there actually is traffic, 2) that the cable modem's
dhcp requests, if any, are being replied to. If there is no traffic,
there is no signal or the cable modem can't sync up with the network
and if the status indicators say otherwise, they're lying. Some cheap
modems lie. If you see a bunch of dhcp requests coming from your
router that are not getting any response then you will not have any
access to anything. This could mean that your modem is too weak or is
out on the fringe of the network, too far away to connect reliably. It
could also mean that there is a problem, perhaps with a signal
attenuator or amplifier that should not be there or is the wrong type,
or a directional coupler upstream somewhere in the cable system. If
everything looks fine, try pinging a known host by it's ip and by it's
name. If there is a response pinging by ip but no response when
pinging by name then there is a problem with talking to nameservers.
Note the times and duration when the problem occurs, note whatever
else in the house is in use at the time. If possible, note what
neighbours are doing. You will be looking for patterns and coinciding
events. If the problem occurs at regular times, or when certain other
devices are on, off or whatever, then there is a good chance that
there is interference. Whatever the problem, keeping track of times
and so on will help solve it or narrow down and eliminate possibilities.
Without details, such as any error messages you get, any errors from
the router log, et cetera, I can offer no other suggestions.
Unfortunately cable companies are not entirely trustworthy so don't
simply take them at their word. While most do care about more than
just taking your money, there could be personnel or training problems.
Some companies are too shorthanded to be helpful and experienced
people are frequently replaced because companies invest and depend too
much on useless knowledge bases to "solve" problems. If you are still
having trouble and can't find the problem, see if it's possible to
take it up with a higher level in the cable company, where the more
experienced people are.
Consider every possibility. Don't get frustrated or something obvious
may be overlooked.
Have fun.
==
jd
It shall be unlawful for any suspicious person to be within the
municipality.
~ -- Local ordinance, Euclid Ohio
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Hash: SHA1
Richard さんは書きました:
| I have been having intermittant connectivity problems, so started
trying to
| fix like an auto mechanic: replace a part at a time and see what
works.
| Router is linksys, fairly new so not suspicious. Cable modem was
maybe 5-6
| years old or more, so replaced that. Not much change, still lose
| connectivity at an odd time, nothing can get me back up, then some
hours
| later, voila!, I am back on...so rush to get out emails, or
questions like
| this while possible. New cable modem has new MAC address, which I
registered
| with ISP, but am not sure how to re-set in SUSE 11. On the one
hand, I am
| online now, but check with eth0 in YAST, Network Devices, shows old MAC
| address. I assume I can manually change in a file probably in /etc,
but I
| did not find one that seemed obvious. Any suggestions?
|
You did not mention whether or not you are using wireless router.
Doesn't much matter, really...
The method of replacing things one at a time doesn't really work well
for this kind of stuff. Most car parts aren't configurable and don't
have firmware, etc. So replacing the hardware does not necessarily
mean that the programming and setup will also change. For such stuff,
observation, snooping, divide and conquer, experimentation,
programming, research and a bit of skull sweat works better and
generally costs less.
What do the status lights on the cable modem indicate? Is there a
change when the problem occurs? Are your using clean, preferably new
RG6 or better coax to your cable modem? Does the entire house have
RG6, from the drop or poe (point-of-entry) and to every single point
in the house? Is there any coax that is being bent into a sharp turn,
especially at connectors? Are you using high-quality F-connectors? Are
there any cheap connectors or fittings anywhere--including any that
_look_ cheap? Are any fittings or connectors loose? What happens if
you shake any loose cables anywhere in and around the house? Is it
more likely to occur when the TV is on? Perfect cabling is not
essential but it helps a great deal. Ready-made cable tends to be
poorer quality than the average, custom-made-on-the-spot
hand-terminated cable, though you can buy good or better quality
ready-made cable at insanely excessive prices.
Your cable modem is connected to the router? Then you don't need to
change anything on your box. Unless you are not using dhcp and have it
set up on your router, or haven't set a default route, set up
/etc/resolv.conf, etc., etc.
How do you know it's not your router? Is your router correctly
configured for the cable modem, including MAC cloning? Or does your
cable modem not require MAC cloning? Is dhcp working properly and
consistently? Does your router have the latest firmware version? Have
you checked with Linksys to see if your router has any known bugs or
problems? Even new routers have problems. You can probably find out
more by trying a different router--different brand and model--or by by
looking at the traffic between the router and modem.
Do you have other boxen on the LAN that have the same problem?
If you connect your box directly to the cable modem, with it correctly
configured, can you see any packets coming from the cable modem using
wireshark? Normally you would see lots of arp and broadcast traffic.
If you can't connect directly to the cable modem, do you have a hub
that you can put between the cable modem and router? (Using a hub this
way will help tell you whether or not both the cable modem and the
router are working.) If so, you can plug in your box (or another) and
use wireshark to look at the traffic between the router and cable
modem. This requires a _hub_, /not/ a switch. A couple things to look
for are 1) that there actually is traffic, 2) that the cable modem's
dhcp requests, if any, are being replied to. If there is no traffic,
there is no signal or the cable modem can't sync up with the network
and if the status indicators say otherwise, they're lying. Some cheap
modems lie. If you see a bunch of dhcp requests coming from your
router that are not getting any response then you will not have any
access to anything. This could mean that your modem is too weak or is
out on the fringe of the network, too far away to connect reliably. It
could also mean that there is a problem, perhaps with a signal
attenuator or amplifier that should not be there or is the wrong type,
or a directional coupler upstream somewhere in the cable system. If
everything looks fine, try pinging a known host by it's ip and by it's
name. If there is a response pinging by ip but no response when
pinging by name then there is a problem with talking to nameservers.
Note the times and duration when the problem occurs, note whatever
else in the house is in use at the time. If possible, note what
neighbours are doing. You will be looking for patterns and coinciding
events. If the problem occurs at regular times, or when certain other
devices are on, off or whatever, then there is a good chance that
there is interference. Whatever the problem, keeping track of times
and so on will help solve it or narrow down and eliminate possibilities.
Without details, such as any error messages you get, any errors from
the router log, et cetera, I can offer no other suggestions.
Unfortunately cable companies are not entirely trustworthy so don't
simply take them at their word. While most do care about more than
just taking your money, there could be personnel or training problems.
Some companies are too shorthanded to be helpful and experienced
people are frequently replaced because companies invest and depend too
much on useless knowledge bases to "solve" problems. If you are still
having trouble and can't find the problem, see if it's possible to
take it up with a higher level in the cable company, where the more
experienced people are.
Consider every possibility. Don't get frustrated or something obvious
may be overlooked.
Have fun.
==
jd
It shall be unlawful for any suspicious person to be within the
municipality.
~ -- Local ordinance, Euclid Ohio
- --
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.4-svn0 (GNU/Linux)
iD8DBQFJDyWohpL3F+HeDrIRAs1mAJ0d9EzP4lp/MrgH36iNp8cDSRroTwCZATIY
Nw2h7Cdvrq/miXBBHMIsfJE=
=pKTA
-----END PGP SIGNATURE-----
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