diff --git a/utils/misc/src/main/java/org/onlab/packet/ICMP.java b/utils/misc/src/main/java/org/onlab/packet/ICMP.java
index 9513061..bed5ab9 100644
--- a/utils/misc/src/main/java/org/onlab/packet/ICMP.java
+++ b/utils/misc/src/main/java/org/onlab/packet/ICMP.java
@@ -251,6 +251,7 @@
         ipReply.setDestinationAddress(ipRequest.getSourceAddress());
         ipReply.setSourceAddress(destAddress);
         ipReply.setTtl((byte) 64);
+        ipReply.setDiffServ(ipRequest.getDiffServ());
         ipReply.setChecksum((short) 0);
         ipReply.setProtocol(IPv4.PROTOCOL_ICMP);
 
diff --git a/utils/misc/src/main/java/org/onlab/packet/ICMP6.java b/utils/misc/src/main/java/org/onlab/packet/ICMP6.java
index e50df26..98acad5 100644
--- a/utils/misc/src/main/java/org/onlab/packet/ICMP6.java
+++ b/utils/misc/src/main/java/org/onlab/packet/ICMP6.java
@@ -400,6 +400,7 @@
         ipv6Reply.setDestinationAddress(ipv6Request.getSourceAddress());
         ipv6Reply.setSourceAddress(destAddress);
         ipv6Reply.setHopLimit((byte) 64);
+        ipv6Reply.setTrafficClass(ipv6Request.getTrafficClass());
         ipv6Reply.setNextHeader(IPv6.PROTOCOL_ICMP6);
 
         ICMP6 icmpv6Reply = new ICMP6();