opnsense
Changing the netmask of a Virtual IP does not apply change
Consider the following configuration:
This results in the following IP addresses set on the LAN interface:
inet6 fe80::1%vtnet0 prefixlen 64 scopeid 0x1
inet6 fe80::53%vtnet0 prefixlen 64 scopeid 0x1
If you change the subnet mask, and then hit Apply, nothing on the system changes:
The system is still configured as:
inet6 fe80::1%vtnet0 prefixlen 64 scopeid 0x1
inet6 fe80::53%vtnet0 prefixlen 64 scopeid 0x1
Removing and adding the aliased addresses again works as expected.
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for some reason ifconfig doesn't accept changes here, example output when changing 128 to 120 (or anything else):
# /sbin/ifconfig vtnet2 inet6 'ffff:ffff:fffff::4f31' prefixlen '120' alias vhid '3'
ifconfig: ioctl (SIOCAIFADDR): Invalid argument
I can confirm that the changing netmask / prefix len of IPv4 address with alias command works as expected. But change IPv6 address ' prefex len the ifconfig(8) response with false positive .
# ifconfig cxl1 inet6 2001:db8::12ab/64 alias
# ifconfig cxl1 inet6 | grep 2001
inet6 2001:db8::12ab prefixlen 64
# ifconfig cxl1 inet6 2001:db8::12ab/80 alias && ifconfig cxl1 inet6 | grep 2001
inet6 2001:db8::12ab prefixlen 64
It appears to be a genuine bug. The second alias command should either fail or succeed, but not left nothing changed.