If you want to disable ipv6 by using a global command "set system ipv6 disable" it doesn't work well.
For example, after executing the command "set system ipv6 disable" you can't change MTU on bridge interfaces less than 1280 because the error appears:
vyos@hh-vpn# set system ipv6 disable
[edit]
vyos@hh-vpn# commit
Changing IPv6 disable parameter will only take affect
when the system is rebooted.
[edit]
vyos@hh-vpn# save
Saving configuration to '/config/config.boot'...
Done
[edit]
vyos@hh-vpn# exit
exit
vyos@hh-vpn:~$ reboot
Are you sure you want to reboot this system? [y/N] y
vyos@hh-vpn# set interfaces bridge br1 mtu 1000
[edit]
vyos@hh-vpn# commit
[ interfaces bridge br1 ]
VyOS had an issue completing a command.
We are sorry that you encountered a problem while using VyOS.
There are a few things you can do to help us (and yourself):
- Contact us using the online help desk if you have a subscription:
https://support.vyos.io/
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Report time: 2022-03-23 06:37:59
Image version: VyOS 1.3.1
Release train: equuleus
Built by: Sentrium S.L.
Built on: Sat 19 Mar 2022 17:46 UTC
Build UUID: ***
Build commit ID: ***
Architecture: x86_64
Boot via: installed image
System type: KVM guest
Hardware vendor: ***
Hardware model: ***
Hardware S/N: ***
Hardware UUID: ***
Traceback (most recent call last):
File "/usr/libexec/vyos/conf_mode/interfaces-bridge.py", line 171, in <module>
apply(c)
File "/usr/libexec/vyos/conf_mode/interfaces-bridge.py", line 162, in apply
br.update(bridge)
File "/usr/lib/python3/dist-packages/vyos/ifconfig/bridge.py", line 374, in update
super().update(config)
File "/usr/lib/python3/dist-packages/vyos/ifconfig/interface.py", line 1394, in update
self.add_ipv6_eui64_address('fe80::/64')
File "/usr/lib/python3/dist-packages/vyos/ifconfig/interface.py", line 687, in add_ipv6_eui64_address
self.add_addr(f'{eui64}/{prefixlen}')
File "/usr/lib/python3/dist-packages/vyos/ifconfig/interface.py", line 998, in add_addr
self._cmd(f'ip addr add "{addr}" '
File "/usr/lib/python3/dist-packages/vyos/ifconfig/control.py", line 52, in _cmd
return cmd(command, self.debug)
File "/usr/lib/python3/dist-packages/vyos/util.py", line 161, in cmd
raise OSError(code, feedback)
FileNotFoundError: [Errno 2] failed to run command: ip addr add
"fe80::526b:8dff:feb0:6381/64" dev "br1"
returned:
exit code: 2
noteworthy:
cmd 'ip addr add "fe80::526b:8dff:feb0:6381/64" dev "br1"'
returned (out):
returned (err):
RTNETLINK answers: Invalid argument
[[interfaces bridge br1]] failed
Commit failed
[edit]To solve this issue you need also to use this command on each bridge interface "set interfaces bridge brX ipv6 address no-default-link-local".
It's unusual behavior the command "set system ipv6 disable".