I work in a College IT department for a University. I'm working between a student of ours and our Network Operations Center (NOC). The student has a brand new Apple Macbook running Leopard 10.5.1. When trying to connect to our University's Wireless Network he receives a Connection timeout error almost instantly. Our wireless network consists of Cisco Access Points. MAC Addresses are required to be registered before a connection can be made, plus the laptop must be set for Open Network and have a WEP key.
My contact at NOC tells me something on the laptop is remembering an invalid ip address or assigning itself an invalid ip address before it receives its DHCP address. Each time it changes its address it causes a re-authentication. After 5 failed authentications it is placed in exclusion for 60 seconds.
The only way for the laptop to connect to the wireless network is for NOC to disable the security policy for this "5 failed authentications". Once that policy is turned off, the laptop connects instantly. NOC is only willing to disable this policy for testing only, so it must remain on the rest of the time.
Attached is the log from the Cisco Access Point and Macbook System Log.
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Didn't seem to make a difference.
We believe it may be a hardware issue.
Booting laptop from another system over firewire yields the same results.
Booting the system over firewire on another laptop allows access to the network.
Problem stays with the hardware.
Checked all system updates, changed MTU, and reset the PRAM multiple times. Still no luck.
Maybe look at downloading and reinstalling the firmware for the Airport card. I just helped someone else with a mystery problem similar to yours. He had a wireless version that was designed for global interface. The flash put it back in ad hoc mode and then it worked. Long shot for you. check and see if his standard is 802.11d . Even if it isn't a reflash could not hurt. http://www.apple.com/downl
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by: pheidiusPosted on 2007-11-30 at 17:12:27ID: 20386508
if they are right about it self assigning tehn might be worth it to go into terminal and do a release/renew. I think it is sudo ipconfig set en0 BOOTP or you could try sudo ifconfig eno down ; sudo ifconfig esudo ipconfig en0 BOOTP n1 up
"The ipconfig set en BOOTP causes OS X to release the address; then ipconfig set en DHCP causes OS X to attempt to get a new address. On some networks, the behavior will basically be the same, but depending on the topology and what\'s going on, you could get very different results doing a RELEASE/NEW LEASE versus a true RENEW.
On the GUI version, OS X has a bug in its behavior where its RENEW is actually a REBIND. Again, this is probably going to get you the same results on many networks, but it\'s not a real RENEW. The difference between a RENEW and a REBIND is that a RENEW is a directed unicast to the original server that gave you the address asking for an extension on the list; a REBIND is a broadcast that you do after you don\'t get an answer on your RENEW (T1 has expired, and T2 has expired). "
I any case I think it could not hurt to do a complete release below the gui level and then reset its new adress
o, by the way looking again at your post, it might be en1 instead of en0 asen0 would be your ethernet port while en1 would likely be your wireless port .perhaps before you reboot the modem you could run ipconfig getifaddr en0 0r en1 as the case may be and see if it is selfassigning a nonworking ip