bug 11590:

reviewed-by: Abhi

Summary of Changes:
 while adding a primary address to the domR interface, previous primaray addresses(ip) are removed and added as with 32-bit netmask.
   This is to avoid two same ip's with different netmask attached to the interface.

patches/systemvm/debian/config/root/ipassoc.sh

@@ -103,13 +103,56 @@ del_vpn_chain_for_ip () {
   logger -t cloud "$(basename $0): vpn chain did not exist for $pubIp, cleaned up"
 }
 
+convert_primary_to_32() {
+  local existingIpMask=$(sudo ip addr show dev $ethDev | grep "inet " | awk '{print $2}')
+  local primary=$(echo $1 | awk -F'/' '{print $1}')
+# add 32 mask to the existing primary
+  for ipMask in $existingIpMask
+  do
+      local ipNoMask=$(echo $ipMask | awk -F'/' '{print $1}')
+      local mask=$(echo $ipMask | awk -F'/' '{print $2}')
+      if [ "$ipNoMask" == "$primary" ]
+      then
+        continue
+      fi
+      if [ "$mask" != "32" ]
+      then
+         sudo ip addr add dev $ethDev $ipNoMask/32
+      fi
+  done
+#delete primaries
+  for ipMask in $existingIpMask
+  do
+      local ipNoMask=$(echo $ipMask | awk -F'/' '{print $1}')
+      local mask=$(echo $ipMask | awk -F'/' '{print $2}')
+      if [ "$ipNoMask" == "$primary" ]
+      then
+        continue
+      fi
+      if [ "$mask" != "32" ]
+      then
+    # this would have erase all primaries and secondaries in the previous loop, so we need to eat up the error.
+         sudo ip addr del dev $ethDev $ipNoMask/$mask > /dev/null
+      fi
+  done
+}
+
+
 add_nat_entry() {
   local pubIp=$1
   logger -t cloud "$(basename $0):Adding nat entry for ip $pubIp on interface $ethDev"
   local ipNoMask=$(echo $1 | awk -F'/' '{print $1}')
+  local mask=$(echo $1 | awk -F'/' '{print $2}')
   sudo ip link show $ethDev | grep "state DOWN" > /dev/null
   local old_state=$?
+  
+  convert_primary_to_32 $pubIp
   sudo ip addr add dev $ethDev $pubIp
+  if [ "$mask" != "32" ] && [ "$mask" != "" ]
+  then
+    # remove if duplicat ip with 32 mask, this happens when we are promting the ip to primary
+       sudo ip addr del dev $ethDev $ipNoMask/32 > /dev/null
+  fi
   sudo iptables -D FORWARD -i $ethDev -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
   sudo iptables -D FORWARD -i eth0 -o $ethDev  -j ACCEPT
   sudo iptables -t nat -D POSTROUTING   -j SNAT -o $ethDev --to-source $ipNoMask ;

server/src/com/cloud/network/router/VirtualNetworkApplianceManagerImpl.java

@@ -2194,7 +2194,12 @@ public class VirtualNetworkApplianceManagerImpl implements VirtualNetworkApplian
                 ip.setTrafficType(network.getTrafficType());
                 ip.setNetworkTags(network.getTags());
                 ipsToSend[i++] = ip;
-                firstIP = false;
+                /* send the firstIP = true for the first Add, this is to create primary on interface*/
+                if (!firstIP || add)  {
+                    firstIP = false;
+                }
+                
+
             }
             IpAssocCommand cmd = new IpAssocCommand(ipsToSend);
             cmd.setAccessDetail(NetworkElementCommand.ROUTER_IP, router.getPrivateIpAddress());