diff --git a/internal/definitions/config/config.go b/internal/definitions/config/config.go
index 2d96726..232aa32 100644
--- a/internal/definitions/config/config.go
+++ b/internal/definitions/config/config.go
@@ -9,6 +9,7 @@ import (
 	"nfsense.net/nfsense/internal/definitions/firewall"
 	"nfsense.net/nfsense/internal/definitions/network"
 	"nfsense.net/nfsense/internal/definitions/object"
+	"nfsense.net/nfsense/internal/definitions/service"
 )
 
 type Config struct {
@@ -16,6 +17,7 @@ type Config struct {
 	Firewall      firewall.Firewall `json:"firewall" validate:"required,dive"`
 	Object        object.Object     `json:"object" validate:"required,dive"`
 	Network       network.Network   `json:"network" validate:"required,dive"`
+	Service       service.Service   `json:"service" validate:"required,dive"`
 }
 
 // Clone TODO find a better way to deep copy
diff --git a/internal/definitions/service/dhcp_v4.go b/internal/definitions/service/dhcp_v4.go
new file mode 100644
index 0000000..93da47c
--- /dev/null
+++ b/internal/definitions/service/dhcp_v4.go
@@ -0,0 +1,21 @@
+package service
+
+import (
+	"time"
+)
+
+type DHCPv4 struct {
+	Interface        string
+	Pool             []string
+	DefaultLeaseTime time.Duration
+	MaxLeaseTime     time.Duration
+
+	GatewayMode   Mode
+	Gateway       *string
+	DNSServerMode Mode
+	DNSServer     *[]string
+	NTPServerMode Mode
+	NTPServer     *[]string
+
+	Reservations []Reservation
+}
diff --git a/internal/definitions/service/dhcp_v6.go b/internal/definitions/service/dhcp_v6.go
new file mode 100644
index 0000000..267152e
--- /dev/null
+++ b/internal/definitions/service/dhcp_v6.go
@@ -0,0 +1,19 @@
+package service
+
+import "time"
+
+type DHCPv6 struct {
+	Interface        string
+	Pool             []string
+	DefaultLeaseTime time.Duration
+	MaxLeaseTime     time.Duration
+
+	GatewayMode   Mode
+	Gateway       *string
+	DNSServerMode Mode
+	DNSServer     *[]string
+	NTPServerMode Mode
+	NTPServer     *[]string
+
+	Reservations []Reservation
+}
diff --git a/internal/definitions/service/mode.go b/internal/definitions/service/mode.go
new file mode 100644
index 0000000..c5168c4
--- /dev/null
+++ b/internal/definitions/service/mode.go
@@ -0,0 +1,37 @@
+package service
+
+import "encoding/json"
+
+type Mode int
+
+const (
+	None Mode = iota
+	Interface
+	Specify
+)
+
+func (t Mode) String() string {
+	return [...]string{"none", "interface", "specify"}[t]
+}
+
+func (t *Mode) FromString(input string) Mode {
+	return map[string]Mode{
+		"none":      None,
+		"interface": Interface,
+		"specify":   Specify,
+	}[input]
+}
+
+func (t Mode) MarshalJSON() ([]byte, error) {
+	return json.Marshal(t.String())
+}
+
+func (t *Mode) UnmarshalJSON(b []byte) error {
+	var s string
+	err := json.Unmarshal(b, &s)
+	if err != nil {
+		return err
+	}
+	*t = t.FromString(s)
+	return nil
+}
diff --git a/internal/definitions/service/reservation.go b/internal/definitions/service/reservation.go
new file mode 100644
index 0000000..8c5665f
--- /dev/null
+++ b/internal/definitions/service/reservation.go
@@ -0,0 +1,12 @@
+package service
+
+import (
+	"net/netip"
+
+	"nfsense.net/nfsense/internal/definitions/common"
+)
+
+type Reservation struct {
+	HardwareAddress common.HardwareAddress
+	IPAddress       netip.Addr
+}
diff --git a/internal/definitions/service/service.go b/internal/definitions/service/service.go
new file mode 100644
index 0000000..9baaabf
--- /dev/null
+++ b/internal/definitions/service/service.go
@@ -0,0 +1,6 @@
+package service
+
+type Service struct {
+	DHCPv4 []DHCPv4 `json:"dhcp_v4" validate:"required,dive"`
+	DHCPv6 []DHCPv6 `json:"dhcp_v6" validate:"required,dive"`
+}