Re: dhcpcd ignores netmask from server, installs /8 or /24 instead

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

On Fri, 12 Dec 2014, John D. Baker wrote:

> Following an update and a reboot, 'dhcpcd' ignores the "/20" netmask
> presented by the ISP's DHCP server and instead installs the address with
> a "/8" netmask instead (the address assigned by the DHCP server would
> otherwise be a Class A were it not for the "/20" netmask).

With dhcpcd v6.4.3 in netbsd-7, this appears to be related to the use of
the "noalias" directive.  While using "noalias" to prevent the dynamic
address being installed as an alias, a bogus netmask would be used.

Without "noalias", the server-provided netmask is used.

Some tweaks to "dhcpcd.exit-hook" provide the desired behavior with
respect to installing/removing additional alias addresses.  Basically,
install the alias on any nominal "success" case that may cause installation
of a new address (BOUND, IPV4LL, STATIC, TIMEOUT) and remove on preparatory
cases (PREINIT, REBIND, REBOOT, STOP).

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