Public bug reported:
I have a system with two internet connections, both configured using
DHCP. They are specified in /etc/network/interfaces roughly as follows:
iface lte0 inet dhcp
iface wlan0 inet dhcp
wpa-ssid XXXX
wpa-psk XXXX
I also have defined custom options for each interface in the
/etc/dhcp/dhclient.conf file:
interface "lte0" {
send host-name "hostA";
}
interface "wlan0" {
send host-name "hostB";
}
When I do "ifup wlan0", the wrong interface is brought up:
Listening on LPF/lte0/94:b9:b4:18:e5:ce
Sending on LPF/lte0/94:b9:b4:18:e5:ce
Listening on LPF/wlan0/00:26:b6:e1:7c:64
Sending on LPF/wlan0/00:26:b6:e1:7c:64
Sending on Socket/fallback
DHCPDISCOVER on lte0 to 255.255.255.255 port 67 interval 3 (xid=0xbb4b7c57)
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 3 (xid=0xbf50be57)
DHCPREQUEST of 100.70.63.250 on lte0 to 255.255.255.255 port 67 (xid=0x577c4bbb)
DHCPOFFER of 100.70.63.250 from 100.70.63.1
DHCPACK of 100.70.63.250 from 100.70.63.1
bound to 100.70.63.250 -- renewal in 270090 seconds.
Similarly, if I do "ifdown wlan0", both interfaces are released:
Listening on LPF/lte0/94:b9:b4:18:e5:ce
Sending on LPF/lte0/94:b9:b4:18:e5:ce
Listening on LPF/wlan0/00:26:b6:e1:7c:64
Sending on LPF/wlan0/00:26:b6:e1:7c:64
Sending on Socket/fallback
DHCPRELEASE on lte0 to 100.70.63.1 port 67 (xid=0x2f4f2125)
DHCPRELEASE on wlan0 to 10.78.56.254 port 67 (xid=0x15a5a)
I expect that ifup/ifdown only operates on the interface specified on
the command line. Instead they are operating on other interfaces that I
did not want them to touch.
I believe the problem is related to this statement in the dhclient man page:
It is also possible to specify interfaces by name in the dhclient.conf
file. If interfaces are specified in this way,
then the client will only configure interfaces that are either
specified in the configuration file or on the command line,
and will ignore all other interfaces.
So it's reading all interfaces from the configuration file and adding
them to the command line interfaces, and operating on all such
interfaces. If I remove the interface stanzas from the
/etc/dhcp/dhclient.conf file, then everything works as expected.
** Affects: isc-dhcp (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1524093
Title:
dhclient operates on incorrect interface
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