diff --git a/src/aodv/model/aodv-neighbor.cc b/src/aodv/model/aodv-neighbor.cc
index 4599a0c..090d596 100644
--- a/src/aodv/model/aodv-neighbor.cc
+++ b/src/aodv/model/aodv-neighbor.cc
@@ -149,7 +149,7 @@ Neighbors::LookupMacAddress (Ipv4Address addr)
        i != m_arp.end (); ++i)
     {
       ArpCache::Entry * entry = (*i)->Lookup (addr);
-      if (entry != 0 && entry->IsAlive () && !entry->IsExpired ())
+      if (entry != 0 && (entry->IsAlive () || entry->IsPermanent ()) && !entry->IsExpired ())
         {
           hwaddr = Mac48Address::ConvertFrom (entry->GetMacAddress ());
           break;
diff --git a/src/dsr/model/dsr-rcache.cc b/src/dsr/model/dsr-rcache.cc
index f9e26af..979a288 100644
--- a/src/dsr/model/dsr-rcache.cc
+++ b/src/dsr/model/dsr-rcache.cc
@@ -1222,7 +1222,7 @@ RouteCache::LookupMacAddress (Ipv4Address addr)
        i != m_arp.end (); ++i)
     {
       ArpCache::Entry * entry = (*i)->Lookup (addr);
-      if (entry != 0 && entry->IsAlive () && !entry->IsExpired ())
+      if (entry != 0 && (entry->IsAlive () || entry->IsPermanent ()) && !entry->IsExpired ())
         {
           hwaddr = Mac48Address::ConvertFrom (entry->GetMacAddress ());
           break;