I want to assign static IP addresses for OSX clients which connect via external wired ethernet devices.
Instead of MAC address, which cannot identify the client, I chose to use the value in Hostname Option 12.
The use case in question is laptops without a network jack. They achieve a wired connection via a dongle
or a docking station / hub. Such devices are external and thus the MAC address cannot be used
to identify the host. That is, I might use the docking station with the pro02 laptop on one day, but the next
day I am using the snorty laptop.
My use case for wireless connections is solved by using 'hardware ethernet' in a host declaration like this:
host pro2 {
hardware ethernet 72:16:05:e3:93:c6;
fixed-address air01.int.unixathome.org;
}
For wired connections, the solution I have found is a pool with a single IP address range.
class "pro02" {
match if ( option host-name = "pro02");
}
subnet 10.12.34.0 netmask 255.255.255.0 {
# option definitions common to all supported networks...
option domain-name "int.unixathome.org";
option domain-name-servers 10.12.34.1, 10.12.34.33, 10.12.34.113;
option routers 10.12.34.1;
pool {
allow members of "pro02";
range 10.12.34.103 10.12.34.103;
}
pool {
range 10.12.34.200 10.12.34.250;
}
}
This works, and I have implemented it for multiple hosts, but I write in case there is a better way.
I was also looking at doing something like this, but it seems that 'fixed address' is not valid in an IF statement.
# the USB-C dongle
host dongle01 {
hardware ethernet 72:16:05:e3:93:c6;
if option host-name = "pro02"
{
fixed-address pro02.int.unixathome.org;
}
ddns-updates off;
option domain-search "int.unixathome.org", "vpn.unixathome.org", "wifi.int.unixathome.org", "unixathom
}
Thank you.
--
Dan Langille
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