Hi
I am using subnet6-add command from subnet6 hook library for adding subnets
. And i am not assigning subnet id and let the system maintain auto generated
value based on the notes below . it works well until we restart the service ,
on restart subnet-id gets reset and starts from 1 again which fails due to
duplicate ID . i am using version 2.1.6. can you shed some light ?
{
"command": "subnet6-add",
"arguments": {
"subnet6": [ {
"subnet": "2001:db8:1::/64",
...
} ]
}
}
Notes
It is recommended, but not mandatory, to specify the subnet ID. If not
specified, Kea will try to assign the next subnet-id value.
This automatic ID value generator is simple; it returns a previously
automatically assigned value, increased by 1. This works well, unless a subnet
is manually created with a value bigger than one previously used. For example,
if subnet4-add is called five times, each without an ID, Kea will assign IDs 1,
2, 3, 4, and 5 and it will work just fine. However, if subnet4-add is called
five times, with the first subnet having the subnet-id of value 3 and the
remaining ones having no subnet-id, the operation will fail. The first command
(with the explicit value) will use subnet-id 3; the second command will create
a subnet with id of 1; the third will use a value of 2; and finally the fourth
will have the subnet-id value auto-generated as 3. However, since there is
already a subnet with that ID, the process will fail.
The general recommendation is either never use explicit values, so the
auto-generated values will always work; or always use explicit values, so the
auto-generation is never used. The two approaches can be mixed only if the
administrator understands how internal automatic subnet-id generation works in
Kea.
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