When you can ping other machines via internal IP addresses (on the same
switched network), you're not really using dns. You're actually using
arp tables that uses the layer two addressing within your client
operating system. (MAC addresses) Internally, you are just using the
router's switching side and not routing traffic out to other networks.
ie. internet perhaps in your case.
It's hard to provide a solid answer or recommendation with the
information provided but in a nutshell, it would be very handy to post
your network information on the troubled devices. In windows, ipconfig
/all or in linux, refer to the network sections here:
http://www.cyberciti.biz/tips/linux-command-to-gathers-up-information-about-a-linux-system.html
If you have other device types, just google on how to obtain a complete
network view on it.
What do the devices that have trouble connecting to external networks
have in common? Example: Are they all on wireless and the others are
not? Are these clients configured correctly for your network? Are they
all located upstairs/downstairs; static or dynamic ip?
I read a bit in the thread below about possible dhcp service pains - you
can certainly bypass that by manually specifying a static IP on any
device within your network. If you post the network information for
one of your working clients, I can tell you a safe IP configuration for
you to use. (outside of the DHCP typical address scope)
Cheers,
Jeff
On 1/6/2012 12:00 PM, linux-request [ at ] lists [ dot ] oclug [ dot ] on [ dot ] ca wrote:
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Today's Topics:
1. Re: need help solving an issue with my network (Gr?goire)
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Message: 1
Date: Thu, 5 Jan 2012 14:26:05 -0500
From: Gr?goire, Andr?<Andre [ dot ] Gregoire [ at ] crtc [ dot ] gc [ dot ] ca>
Subject: Re: [OCLUG-Tech] need help solving an issue with my network
To: linux<linux [ at ] lists [ dot ] oclug [ dot ] on [ dot ] ca>
Message-ID:
<B395D5E85B4251478260FF80668ADD54016869A78A80 [ at ] EXCHNGCLSMB1 [ dot ] corp [ dot ] crtc [ dot ] gc [ dot ] ca>
Content-Type: text/plain; charset="iso-8859-1"
Have you found the problem yet?
My Linksys router had a problem where if it was running for a few days without a power cycle the DHCP service would crash so any new machine or phone trying to lease an IP wouldn't be able to but those already issued IP's worked fine. Power cycle the router and it would work, annoying as hell but finally they issued new firmware that fixed this.
________________________________
Andre Gregoire
Senior Enforcement Officer
Electronic Commerce Enforcement
Canadian Radio-television and Telecommunications Commission (CRTC)
andre [ dot ] gregoire [ at ] crtc [ dot ] gc [ dot ] ca
Telephone 819-953-6972
Government of Canada
-----Original Message-----
From: linux-bounces [ at ] lists [ dot ] oclug [ dot ] on [ dot ] ca [mailto:linux-bounces [ at ] lists [ dot ] oclug [ dot ] on [ dot ] ca] On Behalf Of Brenda J. Butler
Sent: January-01-12 12:09 PM
To: linux
Subject: Re: [OCLUG-Tech] need help solving an issue with my network
Do the machines with DNS problems get their IP addresses via
DHCP? Do they get their nameserver info from DHCP as well?
If so, is DHCP still working? DHCP-assigned addesses have
to be renewed via leases.
Maybe the kids machines/phones DHCP leases expired before
the other leases ...
Have you done an upgrade lately? Changes to the firewall?
You can use the dig command to direct DNS queries to a particular
DNS server:
dig @server.to.query domain.to.ask.about
dig @server.to.query domain.to.ask.about NS
Hope this helps - do send more questions if you have them.
bjb
On Sun, Jan 01, 2012 at 11:55:53AM -0500, ed stuckems wrote:
Folks:
This may be slightly off-topic, so I hope you'll consider this request
for help appropriate for this list.
My home network is suddenly misbehaving and after poking around a bit
I'm at a loss to explain why things aren't working and I can't seem to
fix the problem. Any help/advice would be greatly appreciated.
Here's the problem ... My kids' computers recently stopped serving web
pages. After poking around a bit, it appears that dns requests from
their machines aren't being resolved. Poking around more, I've
discovered that the game consoles and the android based phone aren't
working either and I suspect it's for the same reasons. The phone
worked on the wifi network as recently as last week. However, there
are machines on the network that are working! My linux box, mac book
pro (running Mac OSX), iPad, and Windows Vista computers are all
working.
All the machines are able to access internal machines/servers/services
via ip address (I'm not using dns for internal servers) and everything
internal can be pinged and is able to ping (most) everything else. On
those machines that aren't working, nslookup is not able to resolve
host names and nslookup returns stating that the dns server(s) timed
out.
There are 2 dns servers provided to clients on the network: the
caching server on the router, and the dns server provided by my
service provider. nslookup reports time outs for both servers.
I'm at a loss to explain what's happening and any advice or guidance
for correcting the issue would be greatly appreciated.
regards
eds.
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End of Linux Digest, Vol 85, Issue 4
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