Question about deprecating an address on OSX or BSD

[guylhem]

Hello

I would like to know what is the equivalent on OSX or BSD of the following linux command :

ip -6 addr change 2001::something/64 dev tap0 preferred_lft 0

The idea is to make the address still valid for receiving packets, but not valid for sending them.

I tried to do some googling but I found nothing for OSX or BSD

Thanks
Guylhem

[juhoostman]

Try this: ifconfig DEV inet6 ADDR deprecated

This is not tested at all, since I have no access to an OS X, instead it is quickly derived from the source. You may also have a different version of ifconfig.

[guylhem]

Hello

Thanks - but with this syntax I get:

ifconfig: unable to get address cache: Operation not supported on socket

If I remove "addr" it works, but the address is not deprecated.

Guylhem

[jrocha]

Replace DEV with your device name and ADDR with the address you wish to depreciate, like so:

sudo ifconfig en0 inet6 2001:470::a9:1889:a6e7:ee07:1687 deprecated

[juhoostman]

If this doesn't work, there may be other means to do what you want. You can create a pseudo-interface and assign the addresses you don't want to be used by default to it instead of the real outgoing interface. You should assign only single addresses to the pseudo-interface, not subnets. If the addresses have subnets, add explicit routes to them through their real interfaces.

[juhoostman]

You can also use ip6addrctl if it is available. First run ip6addrctl to see the current policy table, then add a new rule:

Code Select Expand

ip6addrctl add <prefix to be "deprecated"> 1 <label that is not yet used, maybe greater than 10>