diff -urNp old/snmplib/snmp_api.c new/snmplib/snmp_api.c

--- old/snmplib/snmp_api.c	2017-01-16 10:11:37.951994525 +0100

+++ new/snmplib/snmp_api.c	2017-01-16 10:18:42.284631137 +0100

@@ -4931,7 +4931,7 @@ _sess_async_send(void *sessp,

      * specified in the received PDU.  

      */

-    if (session->sndMsgMaxSize != 0 && length > session->sndMsgMaxSize) {

+    if (pdu->version == SNMP_VERSION_3 && session->sndMsgMaxSize != 0 && length > session->sndMsgMaxSize) {

         DEBUGMSGTL(("sess_async_send",

                     "length of packet (%lu) exceeds session maximum (%lu)\n",

                     (unsigned long)length, (unsigned long)session->sndMsgMaxSize));