[CORD-2055] Set hop limit to 64 when relaying DHCPv6

Change-Id: Ic8189eaff52fe2fb743e9fdef6a96609081dce16
diff --git a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp4HandlerImpl.java b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp4HandlerImpl.java
index 85540c6..f8ee711 100644
--- a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp4HandlerImpl.java
+++ b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp4HandlerImpl.java
@@ -586,6 +586,7 @@
         udpPacket.setSourcePort(UDP.DHCP_SERVER_PORT);
         udpPacket.setDestinationPort(UDP.DHCP_SERVER_PORT);
         ipv4Packet.setPayload(udpPacket);
+        ipv4Packet.setTtl((byte) 64);
         etherReply.setPayload(ipv4Packet);
         return etherReply;
     }