vyos@r10# set interfaces ethernet eth3 mtu 9000
[edit]
vyos@r10# set interfaces bonding bond1 member interface eth3
[edit]
vyos@r10# commit
[ interfaces ethernet eth3 ]

WARNING: Cannot apply "mtu" to "9000". Interface "eth3" is a bond
member. Option is inherited from bond "bond1"


[edit]
vyos@r10# run show version 
Version:          VyOS 2026.04.13-0034-rolling
Release train:    current
Release flavor:   generic

Built by:         autobuild@vyos.net
Built on:         Mon 13 Apr 2026 00:35 UTC
Build UUID:       95b0ad8b-7557-4f4f-8567-c07d4b5070b5
Build commit ID:  4d26859088b146

Architecture:     x86_64
Boot via:         installed image
System type:      KVM guest
Secure Boot:      n/a (BIOS)

Hardware vendor:  QEMU
Hardware model:   Standard PC (i440FX + PIIX, 1996)
Hardware S/N:     
Hardware UUID:    62ffea09-f309-425c-b73d-815cf1c21f1e

Copyright:        VyOS maintainers and contributors
[edit]

vyos@r14# set interfaces ethernet eth3 mtu 9000
[edit]
vyos@r14# set interfaces bonding bond1 member interface eth3
[edit]
vyos@r14# commit
[ interfaces ethernet eth3 ]

WARNING: Cannot apply "mtu" to "9000". Interface "eth3" is a bond
member. Option is inherited from bond "bond1"


[ interfaces bonding bond1 ]
PermissionError: [Errno 1] Operation not permitted

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/libexec/vyos/services/vyos-configd", line 157, in run_script
    script.apply(c)
  File "/usr/libexec/vyos/conf_mode/interfaces_bonding.py", line 299, in apply
    b.update(bond)
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/bond.py", line 507, in update
    self.add_port(interface)
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/bond.py", line 313, in add_port
    ret = self.set_interface('bond_add_port', f'+{interface}')
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/control.py", line 195, in set_interface
    return self._set_sysfs(self.config, name, value)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/control.py", line 178, in _set_sysfs
    commited = self._write_sysfs(
               ^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/control.py", line 144, in _write_sysfs
    write_file(filename, str(value))
  File "/usr/lib/python3/dist-packages/vyos/utils/file.py", line 81, in write_file
    raise e
  File "/usr/lib/python3/dist-packages/vyos/utils/file.py", line 70, in write_file
    with open(fname, 'w' if not append else 'a') as f:
PermissionError: [Errno 1] Operation not permitted

[[interfaces bonding bond1]] failed
Commit failed
[edit]
vyos@r14# 
[edit]
vyos@r14# run show ver
Version:          VyOS 2026.04.28-0040-rolling
Release train:    current
Release flavor:   generic

Built by:         autobuild@vyos.net
Built on:         Tue 28 Apr 2026 00:40 UTC
Build UUID:       c828eafa-9840-4729-8891-a0382a08ee09
Build commit ID:  d1bfa067311a6f

Architecture:     x86_64
Boot via:         installed image
System type:      KVM guest
Secure Boot:      n/a (BIOS)

Hardware vendor:  QEMU
Hardware model:   Standard PC (Q35 + ICH9, 2009)
Hardware S/N:     
Hardware UUID:    ec976809-bb5a-4769-8630-72652c43c101

Copyright:        VyOS maintainers and contributors
[edit]
vyos@r14#

set service pppoe-server access-concentrator PPPoE-Server
set service pppoe-server authentication mode local
set service pppoe-server authentication local-users username test password 'test'
set service pppoe-server client-ip-pool PPPOE-POOL range 192.168.255.2-192.168.255.254
set service pppoe-server default-pool 'PPPOE-POOL'
set service pppoe-server gateway-address 192.168.255.1
set service pppoe-server interface eth0
commit

set interfaces bonding bond1 member interface eth3
commit
...
[[interfaces bonding bond1]] failed
Commit failed

...
UNCONN 960    0    rtnl:accel-pppd/3071    *    sk=0 cb=0 groups=0x00000000
UNCONN 0      0    genl:accel-pppd/3071    *    sk=0 cb=0 groups=0x00004000
...