Modifying /etc/network/interfaces to include the following post-up
completed networking startup successfully;
auto int0.51
iface int0.51 inet manual
vlan-raw-device int0
pre-up ifconfig $IFACE up
post-up brctl addbr br_nat_ext
post-down ifconfig $IFACE down
auto br_nat_ext
iface br_nat_ext inet manual
bridge_ports int0.51
bridge_maxwait 5
pre-up ifconfig $IFACE up
post-down ifconfig $IFACE down
auto int0.500
iface int0.500 inet manual
vlan-raw-device int0
pre-up ifconfig $IFACE up
post-up brctl addbr br_int_500
post-down ifconfig $IFACE down
auto br_int_500
iface br_int_500 inet manual
bridge_ports int0.500
bridge_maxwait 5
pre-up ifconfig $IFACE up
post-down ifconfig $IFACE down
Interestingly enough the dhclient also survived (see previous update) when
networking completed successfully;
root@fancy:/data# ps auxf | grep -i dhclient
root 1264 0.0 0.0 99896 5700 ? Ssl 21:59 0:00
/sbin/dhclient -1 -4 -v -i -pf /run/dhclient.br_ext_prim.pid -lf
/var/lib/dhcp/dhclient.br_ext_prim.leases -I -df
/var/lib/dhcp/dhclient6.br_ext_prim.leases br_ext_prim
Both prior boots to this one had no running dhclient after the bridges failed
to come up.
This should imho be unrelated.
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https://bugs.launchpad.net/bugs/1874515
Title:
20.04 does not bring up certain bridges
Status in ifupdown package in Ubuntu:
New
Bug description:
After upgrading from a fully patched ubuntu-server 18.04 to 20.04 and
rebooting I noticed that some of my bridge interfaces defined in
/etc/network/interfaces would not come up while others would.
Bridges brought up at boot:
br_ext_prim
br_ext_sec
br_int_50
br_nat
Bridges missing:
br_int_500
br_nat_ext
Relevant log from 18.04 prior to upgrade:
Apr 23 19:11:37 fancy systemd-udevd[725]: Could not generate persistent MAC
address for br_nat_ext: No such file or directory
Apr 23 19:11:37 fancy systemd[1]: Found device
/sys/subsystem/net/devices/br_nat_ext.
Apr 23 19:11:37 fancy systemd[1]: Started ifup for br_nat_ext.
Apr 23 19:11:37 fancy systemd-networkd[2284]: br_nat_ext: Link UP
Apr 23 19:11:37 fancy sh[2383]: Waiting for br_nat_ext to get ready (MAXWAIT
is 5 seconds).
Apr 23 19:11:37 fancy kernel: [ 9.447538] br_nat_ext: port 1(int0.51)
entered blocking state
Apr 23 19:11:37 fancy kernel: [ 9.447540] br_nat_ext: port 1(int0.51)
entered disabled state
Apr 23 19:11:37 fancy systemd-networkd[2284]: br_nat_ext: Gained carrier
Apr 23 19:11:37 fancy kernel: [ 10.942682] br_nat_ext: port 1(int0.51)
entered blocking state
Apr 23 19:11:37 fancy kernel: [ 10.942683] br_nat_ext: port 1(int0.51)
entered forwarding state
Apr 23 19:11:37 fancy kernel: [ 10.943270] IPv6: ADDRCONF(NETDEV_CHANGE):
br_nat_ext: link becomes ready
Apr 23 19:11:39 fancy systemd-networkd[2284]: br_nat_ext: Gained IPv6LL
Relevant log from 20.04 after upgrade:
Apr 23 19:39:52 fancy ifup[1845]: br_nat_ext: ERROR while getting interface
flags: No such device
Apr 23 19:39:52 fancy ifup[1066]: ifup: failed to bring up br_nat_ext
Apr 23 19:40:04 fancy libvirtd[1935]: Cannot get interface MTU on
'br_nat_ext': No such device
Apr 23 19:40:04 fancy libvirtd[1935]: internal error: Failed to autostart VM
'dns': Cannot get interface MTU on 'br_nat_ext': No such device
Apr 23 19:43:43 fancy libvirtd[1935]: Cannot get interface MTU on
'br_nat_ext': No such device
Apr 23 19:39:52 fancy systemd[1]: networking.service: Main process exited,
code=exited, status=1/FAILURE
Apr 23 19:39:52 fancy systemd[1]: networking.service: Failed with result
'exit-code'.
Apr 23 19:39:52 fancy systemd[1]: Failed to start Raise network interfaces.
Similar logs show up for br_int_500.
Some examples of entries of /etc/network/interfaces:
Not working:
# NAT via main FW
auto int0.51
iface int0.51 inet manual
vlan-raw-device int0
pre-up ifconfig $IFACE up
post-down ifconfig $IFACE down
auto br_nat_ext
iface br_nat_ext inet manual
bridge_ports int0.51
bridge_maxwait 5
pre-up ifconfig $IFACE up
post-down ifconfig $IFACE down
Working:
# 1GE
auto ext0.10
iface ext0.10 inet manual
vlan-raw-device ext0
pre-up ifconfig $IFACE up
post-down ifconfig $IFACE down
# Secondary bridge 1GE
auto br_ext_sec
iface br_ext_sec inet manual
bridge_ports ext0.10
bridge_maxwait 5
post-up ifconfig $IFACE up
post-down ifconfig $IFACE down
Output from syslog in regards to br_ext_sec after upgrade:
Apr 23 19:39:52 fancy systemd-udevd[1366]: br_ext_sec: Could not generate
persistent MAC: No data available
Apr 23 19:39:52 fancy kernel: [ 24.353151] br_ext_sec: port 1(ext0.10)
entered blocking state
Apr 23 19:39:52 fancy kernel: [ 24.353156] br_ext_sec: port 1(ext0.10)
entered disabled state
Apr 23 19:39:52 fancy systemd-networkd[620]: br_ext_sec: Link UP
Apr 23 19:39:52 fancy ifup[1538]: Waiting for br_ext_sec to get ready
(MAXWAIT is 5 seconds).
Apr 23 19:39:52 fancy kernel: [ 24.360953] br_ext_sec: port 1(ext0.10)
entered blocking state
Apr 23 19:39:52 fancy kernel: [ 24.360956] br_ext_sec: port 1(ext0.10)
entered forwarding state
Apr 23 19:39:52 fancy systemd[1]: Found device
/sys/subsystem/net/devices/br_ext_sec.
Apr 23 19:39:52 fancy systemd[1]: Started ifup for br_ext_sec.
Apr 23 19:39:52 fancy sh[1547]: ifup: waiting for lock on
/run/network/ifstate.br_ext_sec
Apr 23 19:39:52 fancy sh[1547]: ifup: interface br_ext_sec already configured
Apr 23 19:39:53 fancy systemd-networkd[620]: br_ext_sec: Gained carrier
No changes applied to /etc/network/interfaces between boots. No complaints
from upgrade process otherwise.
Attaching a slightly redacted interfaces file from the system in the
ticket aswell.
Thanks :)
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