[Kea-users] from dhcpd to kea; classes and subclasses

[Philippe Maechler]

Hello Kea-Users
 
We're running two pairs of dhcpd in our cable and fibre network. The setup
or the config file gets more and more complex and hard to debug or make new
stuff. 
Since we want to use reserved leases and often have to end a lease before it
expires, we're thinking about using kea. 
The last time I looked at kea was before class support was available, which
we also heavily rely on. Meanwhile kea supports classes and I think it's
worth a try ;)
 
A few questions arise before I try to merge our current configuration:
1.     For our fiber network we have a group with global options. Inside the
group we have several hosts
e.g:
group {
       option vendor-encapsulated-options = "s=<SERVERIP>;v=<VLANID>";
host CATV_000001_ONT{hardware ethernet 0:11:22:33:44:10;}
host CATV_000002_ONT{hardware ethernet 0:11:22:33:44:20;}
host CATV_000003_ONT{hardware ethernet 0:11:22:33:44:30;}
.
}
Are groups supported in kea? In dhcpd we're using a class for each option-82
and provide global options inside a group.
 
2.     Each customer (or each option-82) gets one (1) IPv4 address, an IPv6
address an an IPv6-Prefix/56. There are a few cases when a customer gets 2,
3 or sometimes 4 addresses. We solved this with dynamic subclasses
// native vlan, only used when the cpe boots
class "CATV_000001_Port" { 
match if ( substring ( option agent.circuit-id, 0, 25 )      = "gaswXXX003
eth <UNIT>/<PORT>" ); 
match hardware;
}
// voice vlan, only if the customer has voice
class "CATV_000001_Voice" { 
match if ( substring ( option agent.circuit-id, 0, 30 )    = "gaswXXX003 eth
<UNIT>/<PORT>:<VLANDI>" ); 
spawn with option agent.circuit-id; 
lease limit 2;
}
// data / HSI vlan
class "CATV_000001_CPE_DHCP"   { 
match if ( substring ( option agent.circuit-id, 0, 30 )       = "gaswXXX003
eth <UNIT>/<PORT>: <VLANDI>" " ); 
spawn with option agent.circuit-id; 
lease limit 1;
}
I haven't seen anything regarding subclasses in the kea admin guide. Is this
setup possible or are there any other methods to achive this?
 
3.     Are static addresses based on the option-82 and not the mac address
available in kea? 
e.g
host ABCD { 
option agent.circuit-id = "gaswXXX003 eth <UNIT>/<PORT>:<VLANID>";
ipaddress = 10.1.2.3;
}
I didn't check the syntax of that
 
 TIA for your inputs
 
Philippe
 
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