FreeBSD and IP aliases .

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Given an interface with one or more IP aliases; e.g.

wi5: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 172.17.8.1 netmask 0xffffffc0 broadcast 172.17.8.63
        inet 172.16.0.25 netmask 0xfffffffc broadcast 172.16.0.27
        inet 172.16.0.29 netmask 0xfffffffc broadcast 172.16.0.31

It seems to be the case that once you have defined _one_ subnet
which covers -any- of the above 3 IPs for this interface (wi5):

subnet 172.17.8.0 netmask 255.255.255.192 {
        range  172.17.8.10 172.17.8.60;
        option broadcast-address 172.17.8.63;
        option subnet-mask 255.255.255.192;
        option routers 172.17.8.1;
}

That adding an additonal set of lines to mask out the
other ranges for that interface:

        subnet 172.16.0.24 netmask 255.255.255.252 { not authoritative; }
        subnet 172.16.0.28 netmask 255.255.255.252 { not authoritative; }

gives you the error

        Interface wi5 matches multiple shared networks

Which is a bit counter intuitive; as you MUST add those for any other
interfaces you do not run DHCP on.

What is the thinking behind this ? Or is this a bug ?

Dw


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