Hi Jim
You can use any unique numbers for this. I am using like this and working
{
"id": 32,
"subnet": "172.16.32.0/24",
"pools": [
{
"pool": "172.16.32.50 - 172.16.32.250"
}
],
"option-data": [
{
"space": "dhcp4",
"name": "domain-name-servers",
"code": 6,
"data": "172.16.11.30, 172.16.11.31"
},
{
"space": "dhcp4",
"name": "domain-name",
"code": 15,
"data": "example.com"
},
{
"space": "dhcp4",
"name": "routers",
"code": 3,
"data": "172.16.32.1"
},
{
"space": "dhcp4",
"name": "broadcast-address",
"code": 28,
"data": "172.16.32.255"
}
],
"valid-lifetime": 86400,
"max-valid-lifetime": 864000
},
{
"id": 40,
"subnet": "172.16.40.0/24",
"pools": [
{
"pool": "172.16.40.50 - 172.16.40.250"
}
],
"option-data": [
{
"space": "dhcp4",
"name": "domain-name-servers",
"code": 6,
"data": "172.16.11.30, 172.16.11.31"
},
{
"space": "dhcp4",
"name": "domain-name",
"code": 15,
"data": "example.com"
},
{
"space": "dhcp4",
"name": "routers",
"code": 3,
"data": "172.16.40.1"
},
{
"space": "dhcp4",
"name": "broadcast-address",
"code": 28,
"data": "172.16.40.255"
}
],
"valid-lifetime": 86400,
"max-valid-lifetime": 864000
},
On Wed, Aug 27, 2025 at 11:25 PM <[email protected]> wrote:
> On 2025-08-27 12:15, Ben Scott wrote:
> > On 8/27/25 12:33, Jim wrote:
> >> My big question is the ID for each subnet,
> >> I see no info in the docs on if there is a max value for this,
> >
> > At present it is a 32-bit unsigned integer. So 4294967295 is the
> > largest possible value (2^32-1, since it counts from zero).
> >
> > It is defined in src/lib/dhcpsrv/subnet_id.h in the code.
> >
> >> my second concern would be if using large(ish)
> >> values would have any performance impact.
> >
> > I'm not aware of any. It's supposed to just be an opaque identifier.
> > There are plenty of people using "large" values here without complaint.
>
> Thank you Ben and Jonas! I did try searching the docs for this but
> searching for 'subnet' and 'id' weren't helpful. LOL
>
> Jim
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