Red Hat Bugzilla – Bug 438091
Intel 4965 wireless drops connection during dhcp
Last modified: 2009-01-09 01:13:06 EST
Description of problem:
I have a Dell XPS M1330 laptop with an Intel 4965ABGN wireless adapter. I am
not using NetworkManager or wpa_supplicant, just a ifcfg-wlan0 file to start the
wireless connection. The system is up to date on patches and is running kernel
The problem I see is that if the laptop has been used wirelessly in one
environment (like at home with an IP like 192.168.1.102) and then I try to use
it at work, it will not get an IP address from the DHCP server when it boots.
What I see is this:
The wireless card is setup, and is ready.
dhclient sends a DHCPREQUEST for the old IP it had (which is on the wrong
network for the one it needs to be on)
The DHCP server sends a DHCPNAK
The wireless card goes not ready
dhclient tries to send a DHCPDISCOVER but the network is down
The last step is repeated a few times until dhclient gives up
I've verified on the DHCP server that the DHCP request is seen and the DHCPNAK
gets sent (which dhclient notes), and then is not heard from again (none of the
DHCPDISCOVER packets get to the DHCP server).
If I delete /var/lib/dhclient/dhclient-wlan0.leases file and reboot the system
it works fine. dhclient doesn't see an old lease file, and just does the
DHCPDISCOVER to get an IP from the DHCP server.
Running "/sbin/ifup wlan0" after logging in doesn't work either, but some
logging by dhclient ends up in /var/log/messages. I've attached a copy of the
dhclient log entries with debugging turned on for iwl4965. Hopefully that will
help figure out what is going on.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Use system on one wireless network
2. Move to another wireless network and boot system
3. 4965 interface will not have an IP
Created attachment 298462 [details]
/var/log/messages entries showing iwl4965 debugging messages and dhclient log entries
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