The system under test has 3 network interfaces each configured using dhcp.
System configuration:
/etc/network/interfaces:
auto eth0
allow-hotplug eth0
iface eth0 inet dhcp
auto eth2
allow-hotplug eth2
iface eth2 inet dhcp
auto eth3
allow-hotplug eth3
iface eth3 inet dhcp
/etc/dhcp/dhclient.conf:
option rfc3442-classless-static-routes code 121 = array of unsigned
integer 8;
#send host-name "andare.fugue.com";
send host-name = gethostname();
interface "eth2" {
request subnet-mask, broadcast-address, time-offset, interface-mtu,
ntp-servers,
domain-name-servers, domain-name;
require domain-name-servers, domain-name;
send dhcp-client-identifier "cs-controller1";}
interface "eth3" {
request subnet-mask, broadcast-address, time-offset, interface-mtu,
ntp-servers,
domain-name-servers, domain-name;
require domain-name-servers, domain-name;
send dhcp-client-identifier "cs-controller2";}
Post boot 'ifdown ethN; ifup ethN' is executed to reconfigure the dhcp
interfaces one at a time.
Executing ifdown on a specific interface unconfigures the other dhcp
interfaces rather than just the targeted interface.
E. g.: 'ifdown eth2' results in eth3 being unconfigured.
When executing ifdown eth2 we would expect only eth2 to be affected.