Date: Mon, 9 Jun 2025 10:26:44 -0400 From: Paul Procacci <pprocacci@gmail.com> To: Andriy Gapon <avg@freebsd.org> Cc: net@freebsd.org Subject: Re: dhclient vs aliases Message-ID: <CAFbbPui05DiO2WQf16extfKy866B54g9pk18xgR-q2y3v_=_OA@mail.gmail.com> In-Reply-To: <d7284489-c4ef-4d06-8a27-87c497bc879c@FreeBSD.org> References: <d7284489-c4ef-4d06-8a27-87c497bc879c@FreeBSD.org>
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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; } On Mon, Jun 9, 2025 at 10:20 AM Andriy Gapon <avg@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 > > -- __________________ :(){ :|:& };:
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