diff --git a/interfaces.go b/interfaces.go
index b038aa7..71c0be4 100644
--- a/interfaces.go
+++ b/interfaces.go
@@ -214,4 +214,16 @@
 	// DeleteSecurityGroupById disposes of a security group corresponding to the provided ID number.
 	// This method works only if the provider supports the os-security-groups extension.
 	DeleteSecurityGroupById(id int) error
+
+	// ListDefaultSGRules lists default security group rules.
+	// This method only works if the provider supports the os-security-groups-default-rules extension.
+	ListDefaultSGRules() ([]SGRule, error)
+
+	// CreateDefaultSGRule creates a default security group rule.
+	// This method only works if the provider supports the os-security-groups-default-rules extension.
+	CreateDefaultSGRule(SGRule) (*SGRule, error)
+
+	// GetSGRule obtains information for a specified security group rule.
+	// This method only works if the provider supports the os-security-groups-default-rules extension.
+	GetSGRule(string) (*SGRule, error)
 }
diff --git a/servers.go b/servers.go
index a66e9f2..16056ad 100644
--- a/servers.go
+++ b/servers.go
@@ -486,6 +486,52 @@
 	return err
 }
 
+// See the CloudServersProvider interface for details.
+func (gsp *genericServersProvider) ListDefaultSGRules() ([]SGRule, error) {
+	var sgrs []SGRule
+	err := gsp.context.WithReauth(gsp.access, func() error {
+		ep := fmt.Sprintf("%s/os-security-group-default-rules", gsp.endpoint)
+		return perigee.Get(ep, perigee.Options{
+			MoreHeaders: map[string]string{
+				"X-Auth-Token": gsp.access.AuthToken(),
+			},
+			Results: &struct{Security_group_default_rules *[]SGRule}{&sgrs},
+		})
+	})
+	return sgrs, err
+}
+
+// See the CloudServersProvider interface for details.
+func (gsp *genericServersProvider) CreateDefaultSGRule(r SGRule) (*SGRule, error) {
+	var sgr *SGRule
+	err := gsp.context.WithReauth(gsp.access, func() error {
+		ep := fmt.Sprintf("%s/os-security-group-default-rules", gsp.endpoint)
+		return perigee.Post(ep, perigee.Options{
+			MoreHeaders: map[string]string{
+				"X-Auth-Token": gsp.access.AuthToken(),
+			},
+			Results: &struct{Security_group_default_rule **SGRule}{&sgr},
+			ReqBody: struct{Security_group_default_rule SGRule `json:"security_group_default_rule"`}{r},
+		})
+	})
+	return sgr, err
+}
+
+// See the CloudServersProvider interface for details.
+func (gsp *genericServersProvider) GetSGRule(id string) (*SGRule, error) {
+	var sgr *SGRule
+	err := gsp.context.WithReauth(gsp.access, func() error {
+		ep := fmt.Sprintf("%s/os-security-group-default-rules/%s", gsp.endpoint, id)
+		return perigee.Get(ep, perigee.Options{
+			MoreHeaders: map[string]string{
+				"X-Auth-Token": gsp.access.AuthToken(),
+			},
+			Results: &struct{Security_group_default_rule **SGRule}{&sgr},
+		})
+	})
+	return sgr, err
+}
+
 // SecurityGroup provides a description of a security group, including all its rules.
 type SecurityGroup struct {
 	Description string   `json:"description,omitempty"`