My configuration:
/etc/network/interfaces
auto wlan0
iface wlan0 inet manual
wpa-driver wext
wpa-roam /etc/wpa_supplicant/wpa.conf
wpa-roam-default-iface dhcp
iface dhcp inet dhcp
dns-nameservers 8.8.8.8 8.8.4.4
iface dhcp_dns
/etc/wpa_supplicant/wpa.conf
network={
ssid="x"
priority=10
key_mgmt=WPA-PSK
psk="..."
id_str="dhcp_dns"
}
network={
ssid="y"
priority=9
key_mgmt=WPA-PSK
psk="..."
}
After connecting to either the x or y networks, wpa_supplicant calls
`wpa_action connect` which calls `ifup wlan0=dhcp_dns` or `ifup
wlan0=dhcp`, which fails with "ifup: recursion detected for parent
interface wlan0 in post-up phase". Therefore, dhclient is never run, so
wlan0 never gets an IP address.
Note that the wpa_supplicant daemon is started by the /etc/network/if-
up.d/wpasupplicant script, and it inherits the environment from `ifup
wlan0` (including the environment variable used to detect recursion).
`wpa_action connect` then inherits the environment from wpa_supplicant,
and `ifup wlan0=dhcp` inherits it from wpa_action, hence the error from
ifup.
I understand that this variable is meant to avoid certain race
conditions, but I don't believe the type of race condition reported in
bug #1337873 is applicable to this situation. Because wpa_supplicant is
started by ifup itself (and not a boot script), there is no way for the
`ifup wlan0` and `ifup wlan0=dhcp` to be called out of order, so there
is no chance of a race condition. However, maybe I'm missing something
here. Could you explain how the wpa-roam implementation could play
along with ifupdown given that it is started by ifup itself and needs to
call ifup to reconfigure the interface?
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https://bugs.launchpad.net/bugs/1545302
Title:
wpa-roam broken by fix for ifupdown #1337873
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