diff --git a/openstack/networking/v2/subnets/requests.go b/openstack/networking/v2/subnets/requests.go
index a9a3706..a7e6b53 100644
--- a/openstack/networking/v2/subnets/requests.go
+++ b/openstack/networking/v2/subnets/requests.go
@@ -89,7 +89,7 @@
 	IPVersion       int
 	EnableDHCP      *bool
 	DNSNameservers  []string
-	HostRoutes      []interface{}
+	HostRoutes      []HostRoute
 }
 
 // Create accepts a CreateOpts struct and creates a new subnet using the values
@@ -121,7 +121,7 @@
 		IPVersion       int              `json:"ip_version,omitempty"`
 		EnableDHCP      *bool            `json:"enable_dhcp,omitempty"`
 		DNSNameservers  []string         `json:"dns_nameservers,omitempty"`
-		HostRoutes      []interface{}    `json:"host_routes,omitempty"`
+		HostRoutes      []HostRoute      `json:"host_routes,omitempty"`
 	}
 	type request struct {
 		Subnet subnet `json:"subnet"`
@@ -164,7 +164,7 @@
 	Name           string
 	GatewayIP      string
 	DNSNameservers []string
-	HostRoutes     []interface{}
+	HostRoutes     []HostRoute
 	EnableDHCP     *bool
 }
 
@@ -172,11 +172,11 @@
 // values provided.
 func Update(c *gophercloud.ServiceClient, id string, opts UpdateOpts) UpdateResult {
 	type subnet struct {
-		Name           *string       `json:"name,omitempty"`
-		GatewayIP      *string       `json:"gateway_ip,omitempty"`
-		DNSNameservers []string      `json:"dns_nameservers,omitempty"`
-		HostRoutes     []interface{} `json:"host_routes,omitempty"`
-		EnableDHCP     *bool         `json:"enable_dhcp,omitempty"`
+		Name           *string     `json:"name,omitempty"`
+		GatewayIP      *string     `json:"gateway_ip,omitempty"`
+		DNSNameservers []string    `json:"dns_nameservers,omitempty"`
+		HostRoutes     []HostRoute `json:"host_routes,omitempty"`
+		EnableDHCP     *bool       `json:"enable_dhcp,omitempty"`
 	}
 	type request struct {
 		Subnet subnet `json:"subnet"`
diff --git a/openstack/networking/v2/subnets/requests_test.go b/openstack/networking/v2/subnets/requests_test.go
index b49fcb9..987064a 100644
--- a/openstack/networking/v2/subnets/requests_test.go
+++ b/openstack/networking/v2/subnets/requests_test.go
@@ -194,7 +194,15 @@
     "subnet": {
         "network_id": "d32019d3-bc6e-4319-9c1d-6722fc136a22",
         "ip_version": 4,
-        "cidr": "192.168.199.0/24"
+        "cidr": "192.168.199.0/24",
+				"dns_nameservers": ["foo"],
+				"allocation_pools": [
+						{
+								"start": "192.168.199.2",
+								"end": "192.168.199.254"
+						}
+				],
+				"host_routes": [{"destination":"","nexthop": "bar"}]
     }
 }
 			`)
@@ -226,7 +234,21 @@
 		`)
 	})
 
-	opts := CreateOpts{NetworkID: "d32019d3-bc6e-4319-9c1d-6722fc136a22", IPVersion: 4, CIDR: "192.168.199.0/24"}
+	opts := CreateOpts{
+		NetworkID: "d32019d3-bc6e-4319-9c1d-6722fc136a22",
+		IPVersion: 4,
+		CIDR:      "192.168.199.0/24",
+		AllocationPools: []AllocationPool{
+			AllocationPool{
+				Start: "192.168.199.2",
+				End:   "192.168.199.254",
+			},
+		},
+		DNSNameservers: []string{"foo"},
+		HostRoutes: []HostRoute{
+			HostRoute{NextHop: "bar"},
+		},
+	}
 	s, err := Create(fake.ServiceClient(), opts).Extract()
 	th.AssertNoErr(t, err)
 
@@ -248,6 +270,23 @@
 	th.AssertEquals(t, s.ID, "3b80198d-4f7b-4f77-9ef5-774d54e17126")
 }
 
+func TestRequiredCreateOpts(t *testing.T) {
+	res := Create(fake.ServiceClient(), CreateOpts{})
+	if res.Err == nil {
+		t.Fatalf("Expected error, got none")
+	}
+
+	res = Create(fake.ServiceClient(), CreateOpts{NetworkID: "foo"})
+	if res.Err == nil {
+		t.Fatalf("Expected error, got none")
+	}
+
+	res = Create(fake.ServiceClient(), CreateOpts{NetworkID: "foo", CIDR: "bar", IPVersion: 40})
+	if res.Err == nil {
+		t.Fatalf("Expected error, got none")
+	}
+}
+
 func TestUpdate(t *testing.T) {
 	th.SetupHTTP()
 	defer th.TeardownHTTP()
@@ -260,7 +299,9 @@
 		th.TestJSONRequest(t, r, `
 {
     "subnet": {
-        "name": "my_new_subnet"
+        "name": "my_new_subnet",
+				"dns_nameservers": ["foo"],
+				"host_routes": [{"destination":"","nexthop": "bar"}]
     }
 }
 		`)
@@ -292,7 +333,13 @@
 	`)
 	})
 
-	opts := UpdateOpts{Name: "my_new_subnet"}
+	opts := UpdateOpts{
+		Name:           "my_new_subnet",
+		DNSNameservers: []string{"foo"},
+		HostRoutes: []HostRoute{
+			HostRoute{NextHop: "bar"},
+		},
+	}
 	s, err := Update(fake.ServiceClient(), "08eae331-0402-425a-923c-34f7cfe39c1b", opts).Extract()
 	th.AssertNoErr(t, err)