diff --git a/README.md b/README.md
index 8ab03b8..cdd3047 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ This supports the following RFC dictionaries at the moment:
 - [RFC2866](https://tools.ietf.org/html/rfc2866)
 - [RFC2867](https://tools.ietf.org/html/rfc2867)
 - [RFC2868](https://tools.ietf.org/html/rfc2868)
+- [RFC3576](https://tools.ietf.org/html/rfc3576)
 
 ## Usage
 
@@ -29,7 +30,6 @@ Simple example implementations are here:
 - Support the following RFC dictionaries:
   - rfc2869
   - rfc3162
-  - rfc3576
   - rfc3580
   - rfc4072
   - rfc4372
diff --git a/dicts/dictionary.rfc3576 b/dicts/dictionary.rfc3576
new file mode 100644
index 0000000..0060e00
--- /dev/null
+++ b/dicts/dictionary.rfc3576
@@ -0,0 +1,33 @@
+# -*- text -*-
+# Copyright (C) 2020 The FreeRADIUS Server project and contributors
+# This work is licensed under CC-BY version 4.0 https://creativecommons.org/licenses/by/4.0
+# Version $Id$
+#
+#	Attributes and values defined in RFC 3576.
+#	http://www.ietf.org/rfc/rfc3576.txt
+#
+#	$Id$
+#
+ATTRIBUTE	Error-Cause				101	integer
+
+#	Service Types
+
+VALUE	Service-Type			Authorize-Only		17
+
+#	Error causes
+
+VALUE	Error-Cause			Residual-Context-Removed	201
+VALUE	Error-Cause			Invalid-EAP-Packet	202
+VALUE	Error-Cause			Unsupported-Attribute	401
+VALUE	Error-Cause			Missing-Attribute	402
+VALUE	Error-Cause			NAS-Identification-Mismatch	403
+VALUE	Error-Cause			Invalid-Request		404
+VALUE	Error-Cause			Unsupported-Service	405
+VALUE	Error-Cause			Unsupported-Extension	406
+VALUE	Error-Cause			Administratively-Prohibited	501
+VALUE	Error-Cause			Proxy-Request-Not-Routable	502
+VALUE	Error-Cause			Session-Context-Not-Found	503
+VALUE	Error-Cause			Session-Context-Not-Removable	504
+VALUE	Error-Cause			Proxy-Processing-Error	505
+VALUE	Error-Cause			Resources-Unavailable	506
+VALUE	Error-Cause			Request-Initiated	507
diff --git a/radius/src/lib.rs b/radius/src/lib.rs
index 1027757..cd8b92f 100644
--- a/radius/src/lib.rs
+++ b/radius/src/lib.rs
@@ -7,4 +7,5 @@ pub mod rfc2865;
 pub mod rfc2866;
 pub mod rfc2867;
 pub mod rfc2868;
+pub mod rfc3576;
 pub mod tag;
diff --git a/radius/src/rfc3576.rs b/radius/src/rfc3576.rs
new file mode 100644
index 0000000..494c4a3
--- /dev/null
+++ b/radius/src/rfc3576.rs
@@ -0,0 +1,44 @@
+// Code generated by machine generator; DO NOT EDIT.
+
+use crate::avp::{AVPError, AVPType, AVP};
+use crate::packet::Packet;
+
+pub type ErrorCause = u32;
+pub const ERROR_CAUSE_RESIDUAL_CONTEXT_REMOVED: ErrorCause = 201;
+pub const ERROR_CAUSE_INVALID_EAP_PACKET: ErrorCause = 202;
+pub const ERROR_CAUSE_UNSUPPORTED_ATTRIBUTE: ErrorCause = 401;
+pub const ERROR_CAUSE_MISSING_ATTRIBUTE: ErrorCause = 402;
+pub const ERROR_CAUSE_NAS_IDENTIFICATION_MISMATCH: ErrorCause = 403;
+pub const ERROR_CAUSE_INVALID_REQUEST: ErrorCause = 404;
+pub const ERROR_CAUSE_UNSUPPORTED_SERVICE: ErrorCause = 405;
+pub const ERROR_CAUSE_UNSUPPORTED_EXTENSION: ErrorCause = 406;
+pub const ERROR_CAUSE_ADMINISTRATIVELY_PROHIBITED: ErrorCause = 501;
+pub const ERROR_CAUSE_PROXY_REQUEST_NOT_ROUTABLE: ErrorCause = 502;
+pub const ERROR_CAUSE_SESSION_CONTEXT_NOT_FOUND: ErrorCause = 503;
+pub const ERROR_CAUSE_SESSION_CONTEXT_NOT_REMOVABLE: ErrorCause = 504;
+pub const ERROR_CAUSE_PROXY_PROCESSING_ERROR: ErrorCause = 505;
+pub const ERROR_CAUSE_RESOURCES_UNAVAILABLE: ErrorCause = 506;
+pub const ERROR_CAUSE_REQUEST_INITIATED: ErrorCause = 507;
+
+pub type ServiceType = u32;
+pub const SERVICE_TYPE_AUTHORIZE_ONLY: ServiceType = 17;
+
+pub const ERROR_CAUSE_TYPE: AVPType = 101;
+pub fn delete_error_cause(packet: &mut Packet) {
+    packet.delete(ERROR_CAUSE_TYPE);
+}
+pub fn add_error_cause(packet: &mut Packet, value: ErrorCause) {
+    packet.add(AVP::from_u32(ERROR_CAUSE_TYPE, value as u32));
+}
+pub fn lookup_error_cause(packet: &Packet) -> Option<Result<ErrorCause, AVPError>> {
+    packet
+        .lookup(ERROR_CAUSE_TYPE)
+        .map(|v| Ok(v.encode_u32()? as ErrorCause))
+}
+pub fn lookup_all_error_cause(packet: &Packet) -> Result<Vec<ErrorCause>, AVPError> {
+    let mut vec = Vec::new();
+    for avp in packet.lookup_all(ERROR_CAUSE_TYPE) {
+        vec.push(avp.encode_u32()? as ErrorCause)
+    }
+    Ok(vec)
+}