Odd DNS problems with wireless using WPA security.

My partner and I have two Macbooks, hers is the white 1.83Ghz and mine is the white 2.0Ghz. The 1.83 with the latest updates (10.4.8) connects just fine and browses fine, no issues what-so-ever. My 2.0Ghz (also on latest update 10.4.8) does connect through WPA as well, but fails to browse with what appears to be DNS failures.
The console spews out messages like "mDNSResponder: Repeated transitions for interface en1 (192.168.2.102); delaying packets by 5 seconds"
Repeated refreshes of the browsers (Safari and Firefox) have mixed responses but mostly just timeout trying to connect to anything.
I have tried all the tricks that I have heard about, including reinstalling OS X from scratch (wiping out the disk), removing the preferred connections, removing keychains, deleting the ~/Library/Preferences/com.apple.internet... files etc. All with no appearant change.
The machine connects just fine and browses fine with no security or WEP set on the router. Just seems to be related to WPA. The router does not support WPA2 so I cant test that. I have tried 'nslookup' and 'host' in the terminal and get mixed responses. Sometimes it looks up quickly and fine, all the while the browser is timing out in the background on the same host name. Other times those commands also timeout with messages like:
;; connection timed out; no servers could be reached
The /etc/resolv.conf shows the nameserver to be 192.168.2.1 (my router) which is correct as it is the same on the other macbook and windows machines. I did, however, try setting the DNS servers manually to my ISPs servers in the Network Preferences but this made no difference. It is bazaar that two macbooks with what I believe to be identical OS and updates (10.4.8) can have such different results. It is definitely related to WPA, but how it is broken and why I don't know - but it appears to me to be DNS related because pinging and browsing to IP addresses presents no problems.
Any tips on things I can try next would be most helpful. Thanks, Chad.
Macbook 2.0Ghz C2D (white)
Mac OS X (10.4.8)

Yes, same problem here since the Airport update.
Used to have trouble reconnecting after sleep but I solved that problem by deleting then reseting my "Preferred Network" setting.
But since the update the MacBook just loses the connection to the internet. It seems to stay connected to the router (Linksys) and can see my iMac on Bonjour but not Internet connectivity.
On your clue, I disabled WPA and it hooked right up and seems to be working fine.
Now I just have to wait and see if it loses the connection spontaneously over the next few hours.
I don't know why one of your MacBooks is working and the other isn't. Were they both updated last week with the Airport update?
Intel 20" iMac + MacBook 2.0 Mac OS X (10.4.7) Cube 450 G4

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Connecting to 802.11a AP using WPA security - no go

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edit:
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Message was edited by: janiskr

ok, setting to WPA2 solved the issue, because still, with WPA configuration i was not able to connect. allowing TKIP and WPA2 allowed macbook to connect. Also iMac changed the settings to WPA2 and it didn't matter that it had correct settings fot WPA.
weird.
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Huge problems with wireless, would need some help

Sorry for the bad topic, and sorry for my english.
And now the problem.
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When I updated to 10.4.10, had problems with wireless. Able to fix problem

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I am having a DNS problem with my computer. My laptop connects to the internet and my skype works normally but when i try to surf the web it says "DNS Look up failed".

MY PROBLEM
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absolutezero273c

Sorry.
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absolutezero273c

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Message Edited by Ttech on 06-19-2008 07:38 PM
Message Edited by Ttech on 06-20-2008 03:15 AM

[solved] Problems with wireless / dhcp

I've been happily using Arch for the past two years but only recently I hit a problem I can't seem to solve on my own.
I have a wireless network at home, with WPA encryption and suddenly one day (probably after an update) I cannot get the IP address from my router over DHCP any more. The other PC at home (with Windows) works as it used to.
Details:
[fijam@hp510 ~]$ cat /etc/network.d/wlan
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SECURITY="wpa"
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KEY="xxxxxxxxxxxx"
IP="dhcp"
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hostname
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# Some broken DHCP servers do not send one and dhcpcd can work without it.
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#require dhcp_server_identifier
# A hook script is provided to lookup the hostname if not set by the DHCP
# server, but it should not be run by default.
nohook lookup-hostname
noipv4ll
[fijam@hp510 ~]$ sudo netcfg -c wlan
:: wlan up [BUSY]
dhcpcd: version 5.0.6 starting
dhcpcd: eth1: executing `/usr/lib/dhcpcd/dhcpcd-run-hooks', reason PREINIT
dhcpcd: eth1: executing `/usr/lib/dhcpcd/dhcpcd-run-hooks', reason CARRIER
dhcpcd: eth1: rebinding lease of 192.168.1.12
dhcpcd: eth1: sending DHCP_REQUEST (xid 0x55befbc9), next in 3.13 seconds
dhcpcd: eth1: sending DHCP_REQUEST (xid 0x55befbc9), next in 7.96 seconds
dhcpcd: timed out
- DHCP IP lease attempt failed. [FAIL]
[fijam@hp510 ~]$ iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
eth1 IEEE 802.11g ESSID:"wlan"
Mode:Managed Frequency:2.417 GHz Access Point: 00:1E:37:EF:67:60
Bit Rate:54 Mb/s Tx-Power=20 dBm Sensitivity=8/0
Retry limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=68/100 Signal level=-59 dBm Noise level=-89 dBm
Rx invalid nwid:0 Rx invalid crypt:41 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:218 Missed beacon:0
Help would be appreciated, I am really out of ideas here.
Last edited by fijam (2009-08-06 15:35:32)

EDIT: Actaully, dhcpcd still would not work while dhclient obtained IP without problems. I fixed the problem by adding -r <ip> to DHCP_OPTIONS in network.d file but I am still not sure why is it necessary.
EDIT2: Today -- not working again. I increased DHCP_TIMEOUT to 60 and it eventually gets the IP. I am surprised since the link quality is 77 and it had not been necessary before.
Last edited by fijam (2009-08-05 09:11:04)

Odd DNS problems with wireless using WPA security.

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