bin/145269: dhclient fails to get IP address when used with wpa-psk

James McNaughton bitbucket63-it at
Thu Apr 1 16:50:08 UTC 2010

>Number:         145269
>Category:       bin
>Synopsis:       dhclient fails to get IP address when used with wpa-psk
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Apr 01 16:50:07 UTC 2010
>Originator:     James McNaughton
>Release:        8-STABLE
Dewey, Cheatham, & Howe
FreeBSD 8.0-STABLE FreeBSD 8.0-STABLE #2: Mon Mar 29 23:19:44 CDT 2010     root at  i386
dhclient fails to assign an IP address to wlan0. The WAP is using wpa-psk for security and wpa_supplicant successfully associates to the AP. Wait time on the machine in question exceeded 12 hours without the interface being assigned an IP address. Using "/etc/rc.d/netif restart" failed to resolve the issue.

tcpdump on the wlan0 interface showed it to be operational, outputting broadcast packets between the AP and other hosts on the network.

A lease file for the wlan0 interface was apparently successfully created, and showed the expected information for the network, including host IP address, nameserver address, etc.

Forum postings suggested using synchronous dhcp and some reported success. However on this machine that technique resulted in the system hanging on boot waiting for dhclient. Research into dhclient configuration yielded no suggestions for resolution.
Configure the wireless interface to use WPA and DHCP and reboot.
A successful workaround is to configure the interface for WPA and static IP thus:
ifconfig_wlan0="WPA inet x.x.x.x/24"
and adding the appropriate information to resolv.conf.

A multihomed system may need to have the default route explicitly defined in rc.conf:


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