Public bug reported:
[Impact]
When tuntap interfaces are slaves of a bonding interface, arp monitoring
is unusable.
This is fixed upstream with commit a31d27fbed5d ("tun: fix bonding
active backup with arp monitoring"). It will be included in linux v5.16.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a31d27fbed5d
[Test Case]
Create a bonding with two tuntap interfaces and arp monitoring
configured. Before the patch, slave interfaces are flapping
continuously.
Example:
Nov 19 16:12:28 dut-vm kernel: bond0: (slave ntfp2): link status definitely up
Nov 19 16:12:28 dut-vm kernel: bond0: (slave ntfp2): making interface the new
active one
Nov 19 16:12:28 dut-vm kernel: bond0: active interface up!
Nov 19 16:12:31 dut-vm kernel: bond0: (slave ntfp2): link status definitely
down, disabling slave
Nov 19 16:12:31 dut-vm kernel: bond0: now running without any active interface!
Nov 19 16:12:32 dut-vm kernel: bond0: (slave ntfp2): link status definitely up
Nov 19 16:12:32 dut-vm kernel: bond0: (slave ntfp2): making interface the new
active one
Nov 19 16:12:32 dut-vm kernel: bond0: active interface up!
Nov 19 16:12:35 dut-vm kernel: bond0: (slave ntfp2): link status definitely
down, disabling slave
Nov 19 16:12:35 dut-vm kernel: bond0: now running without any active interface!
Nov 19 16:12:36 dut-vm kernel: bond0: (slave ntfp2): link status definitely up
Nov 19 16:12:36 dut-vm kernel: bond0: (slave ntfp2): making interface the new
active one
Nov 19 16:12:36 dut-vm kernel: bond0: active interface up!
Nov 19 16:12:37 dut-vm kernel: bond0: (slave ntfp3): link status definitely up
Nov 19 16:12:39 dut-vm kernel: bond0: (slave ntfp2): link status definitely
down, disabling slave
Nov 19 16:12:39 dut-vm kernel: bond0: (slave ntfp3): making interface the new
active one
[Regression Potential]
The patch is trivial, the potential regressions are low.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
[Impact]
When tuntap interfaces are slaves of a bonding interface, arp monitoring
- is fails
+ is unusable.
This is fixed upstream with commit a31d27fbed5d ("tun: fix bonding
active backup with arp monitoring"). It will be included in linux v5.16.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a31d27fbed5d
[Test Case]
Create a bonding with two tuntap interfaces and arp monitoring
configured. Before the patch, slave interfaces are flapping
continuously.
Example:
Nov 19 16:12:28 dut-vm kernel: bond0: (slave ntfp2): link status definitely up
Nov 19 16:12:28 dut-vm kernel: bond0: (slave ntfp2): making interface the new
active one
Nov 19 16:12:28 dut-vm kernel: bond0: active interface up!
Nov 19 16:12:31 dut-vm kernel: bond0: (slave ntfp2): link status definitely
down, disabling slave
Nov 19 16:12:31 dut-vm kernel: bond0: now running without any active
interface!
Nov 19 16:12:32 dut-vm kernel: bond0: (slave ntfp2): link status definitely up
Nov 19 16:12:32 dut-vm kernel: bond0: (slave ntfp2): making interface the new
active one
Nov 19 16:12:32 dut-vm kernel: bond0: active interface up!
Nov 19 16:12:35 dut-vm kernel: bond0: (slave ntfp2): link status definitely
down, disabling slave
Nov 19 16:12:35 dut-vm kernel: bond0: now running without any active
interface!
Nov 19 16:12:36 dut-vm kernel: bond0: (slave ntfp2): link status definitely up
Nov 19 16:12:36 dut-vm kernel: bond0: (slave ntfp2): making interface the new
active one
Nov 19 16:12:36 dut-vm kernel: bond0: active interface up!
Nov 19 16:12:37 dut-vm kernel: bond0: (slave ntfp3): link status definitely up
Nov 19 16:12:39 dut-vm kernel: bond0: (slave ntfp2): link status definitely
down, disabling slave
Nov 19 16:12:39 dut-vm kernel: bond0: (slave ntfp3): making interface the new
active one
[Regression Potential]
The patch is trivial, the potential regressions are low.
** Summary changed:
- bondig: arp monitoring is failing with tuntap interfaces
+ bonding: arp monitoring is failing with tuntap interfaces
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https://bugs.launchpad.net/bugs/1951606
Title:
bonding: arp monitoring is failing with tuntap interfaces
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