** Also affects: juju-core
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1403955
Title:
DHCP's "Option interface-mtu 9000" is being ignored on bridge
interface br0
Status in juju-core:
Invalid
Status in isc-dhcp package in Ubuntu:
Confirmed
Bug description:
In an env with jumbo frames enabled, and using MAAS as DHCP server,
the client receives the following IPv4 lease:
$ cat /var/lib/dhcp/dhclient.br0.leases
lease {
interface "br0";
fixed-address 10.230.20.26;
filename "pxelinux.0";
option subnet-mask 255.255.248.0;
option dhcp-lease-time 43200;
option routers 10.230.16.1;
option dhcp-message-type 5;
option dhcp-server-identifier 10.230.20.1;
option domain-name-servers 10.230.20.1;
option interface-mtu 9000;
option broadcast-address 10.230.23.255;
option domain-name "ctsstack.qa.1ss";
renew 3 2014/12/17 16:48:15;
rebind 3 2014/12/17 21:52:09;
expire 3 2014/12/17 23:22:09;
}
The interfaces show the following config after boot:
$ ifconfig br0
br0 Link encap:Ethernet HWaddr a0:d3:c1:01:9d:58
inet addr:10.230.20.26 Bcast:10.230.23.255 Mask:255.255.248.0
inet6 addr: fe80::a2d3:c1ff:fe01:9d58/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:530530 errors:0 dropped:0 overruns:0 frame:0
TX packets:1591569 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:68713489 (68.7 MB) TX bytes:213710979 (213.7 MB)
$ ifconfig eth0
eth0 Link encap:Ethernet HWaddr a0:d3:c1:01:9d:58
inet6 addr: fe80::a2d3:c1ff:fe01:9d58/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:10539274 errors:0 dropped:3394 overruns:0 frame:454
TX packets:2627412 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2320560616 (2.3 GB) TX bytes:3562885157 (3.5 GB)
Interrupt:32
"option interface-mtu 9000;" from the lease file is being ignored by br0.
Could it be related to eth0 MTU size? If that's the case, shouldn't both
interfaces be updated?
Other info:
$ brctl show br0
bridge name bridge id STP enabled interfaces
br0 8000.a0d3c1019d58 no eth0
$ cat /etc/network/eth0.config
iface eth0 inet manual
auto br0
iface br0 inet dhcp
bridge_ports eth0
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