On Fri, Nov 28, 2025 at 04:11:54PM +0900, stephane Tranchemer wrote:
> I have the following setup of a network interface with an alias network:
>
> /etc/hostname.igc0
> [...]
> inet 192.168.14.1 0xffffff00
> inet alias 192.168.54.1 0xffffff00
>
> that does the output
> # ifconfig igc0
> [...]
> media: Ethernet autoselect (1000baseT full-duplex)
> status: active
> inet 192.168.14.1 netmask 0xffffff00 broadcast 192.168.54.255
> inet 192.168.54.1 netmask 0xffffff00 broadcast 192.168.54.255
>
> Then I want to use dhcpd with
>
> /etc/dhcpd.conf
> [...]
> option routers 192.168.54.1;
> subnet 192.168.54.0 netmask 255.255.255.0 {
> range 192.168.54.200 192.168.54.230;
> default-lease-time 600;
> max-lease-time 7200;
> }
>
> This exact setup was running fine for "subnet 192.168.14.0", but when I
> changed to "subnet 192.168.54.0" and tried to restart dhcpd it failed.
>
> Here's what I can see:
>
> # /usr/sbin/dhcpd
> Can't listen on igc1 - it has no IP address.
> Can't listen on igc0 - dhcpd.conf has no subnet declaration for
> 192.168.14.1.
> fatal in dhcpd: No interfaces to listen on.
>
> So it tries to look specifically for the first subnet and doesn't even
> acknowledge the presence of the aliased subnet.
Your broadcast address for 192.168.14.0/24 looks wrong, maybe that's related?
Otto
