On 09/06/2025 17:26, Paul Procacci wrote:
Re:
https://forums.freebsd.org/threads/dhclient-trashing-alias-ip-address-upon-reconnect.58729/
You can use a dhclient.conf(5) entry like this to guarantee that the
alias is re-applied every time the interface gets a new address from
DHCP (or the old lease is re-applied):
Code:
alias {
interface "em0";
fixed-address 10.0.0.3;
option subnet-mask 255.255.255.0;
}
Thank you!
This should work, but it kind of kills a "single source of truth" for jail
configurations.
So, it seems that there is a quirk regarding jail+aliases and DHCP.
On Mon, Jun 9, 2025 at 10:20 AM Andriy Gapon <a...@freebsd.org> wrote:
Apologies if this is a FAQ and maybe it has always been like that but I've just
noticed this.
A switch needed to be rebooted, so on a FreeBSD host a link went down and then
up on an interface connected to the switch.
Apparently triggered by those events, dhclient decided to renew the interface's
IP address. Afterwards, all alias IP addresses on that interface were cleared.
Just in case, the new IP address was exactly the same as the old IP address
(it's "hardwired" in the DHCP server configuration).
This was unhelpful because the host runs a number of jails with a simple IP
configuration via aliases.
--
Andriy Gapon
