How did you assign the jails' IPv6 addresses in the first place?  The usual
way is to assign them as /128 aliases, in which case the command to remove
them would include a "/128", not "/48".  I think when you're deleting a
"/48" you're also removing some routes that the jail host is using.
-Alan

On Thu, Jul 12, 2018 at 4:30 PM, Frank de Bot (lists) <li...@searchy.net>
wrote:

> On a older server running FreeBSD 10.2 i have a number of jails. For
> migration to FreeBSD I'm planning to shutdown the jail, move the data to
> the new server and spin up the jail there. IP addresses are alse moved.
>
> When I remove an IPv6 address with the following command 'ifconfig em0
> inet6 v6address/48 delete', all IPv6 traffic on the server stops
> working. I can reach IPv6 from outside to the server and from the server
> to outside, but everything on the server (jail to jail for example)
> immediatly stops working. IPv4 works normally
> Unfortunately it's not feasible to bing-bang migrate everything,
> ignoring ipv6 is not possible because a lot of the jails interact with
> each other with ipv6 (some even exclusivly)
>
> What can cause this?
>
>
> Regards,
>
> Frank de Bot
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