diff --git a/src/ca/bhe.cpp b/src/ca/bhe.cpp
index 12641ee14..f217c0be4 100644
--- a/src/ca/bhe.cpp
+++ b/src/ca/bhe.cpp
@@ -38,6 +38,15 @@ bhe::~bhe ()
 {
 }
 
+void bhe::beaconAnomalyNotify ()
+{
+    tsDLIterBD < tcpiiu > iter = this->iiuList.firstIter ();
+    while ( iter.valid() ) {
+        iter->beaconAnomalyNotify ();
+        iter++;
+    }
+}
+
 /*
  * update beacon period
  *
@@ -51,9 +60,7 @@ bool bhe::updatePeriod ( const epicsTime & programBeginTime,
 
     if ( this->timeStamp == epicsTime () ) {
 
-        if ( this->piiu ) {
-            this->piiu->beaconAnomalyNotify ();
-        }
+        this->beaconAnomalyNotify ();
 
         /* 
          * this is the 1st beacon seen - the beacon time stamp
@@ -73,9 +80,7 @@ bool bhe::updatePeriod ( const epicsTime & programBeginTime,
     if ( this->averagePeriod < 0.0 ) {
         double totalRunningTime;
 
-        if ( this->piiu ) {
-            this->piiu->beaconAnomalyNotify ();
-        }
+        this->beaconAnomalyNotify ();
 
         /*
          * this is the 2nd beacon seen. We cant tell about
@@ -112,9 +117,7 @@ bool bhe::updatePeriod ( const epicsTime & programBeginTime,
              * trigger on any missing beacon 
              * if connected to this server
              */    
-            if ( this->piiu ) {
-                this->piiu->beaconAnomalyNotify ();
-            }
+            this->beaconAnomalyNotify ();
 
             if ( currentPeriod >= this->averagePeriod * 3.25 ) {
                 /* 
@@ -137,9 +140,7 @@ bool bhe::updatePeriod ( const epicsTime & programBeginTime,
          * that the server is available
          */
         else if ( currentPeriod <= this->averagePeriod * 0.80 ) {
-            if ( this->piiu ) {
-                this->piiu->beaconAnomalyNotify ();
-            }
+            this->beaconAnomalyNotify ();
             netChange = true;
         }
         else {
@@ -147,8 +148,10 @@ bool bhe::updatePeriod ( const epicsTime & programBeginTime,
              * update state of health for active virtual circuits 
              * if the beacon looks ok
              */
-            if ( this->piiu ) {
-                piiu->beaconArrivalNotify (); // reset connection activity watchdog
+            tsDLIterBD < tcpiiu > iter = this->iiuList.firstIter ();
+            while ( iter.valid() ) {
+                iter->beaconArrivalNotify ();
+                iter++;
             }
         }
     
@@ -175,10 +178,6 @@ void bhe::show ( unsigned level ) const
 {
     ::printf ( "CA beacon hash entry at %p with average period %f\n", 
         static_cast <const void *> ( this ), this->averagePeriod );
-    if ( level > 0u ) {
-        ::printf ( "network IO pointer %p\n", 
-            static_cast <void *> ( this->piiu ) );
-    }
 }
 
 void bhe::destroy ()
@@ -191,4 +190,15 @@ double bhe::period () const
     return this->averagePeriod;
 }
 
+void bhe::registerIIU ( tcpiiu & iiu )
+{
+    this->iiuList.add ( iiu );
+}
+
+void bhe::unregisterIIU ( tcpiiu & iiu )
+{
+    this->iiuList.remove ( iiu );
+    this->timeStamp = epicsTime();
+    this->averagePeriod = - DBL_MAX;
+}
 
diff --git a/src/ca/bhe.h b/src/ca/bhe.h
index ce64c9116..681d1378a 100644
--- a/src/ca/bhe.h
+++ b/src/ca/bhe.h
@@ -24,6 +24,7 @@
 #endif
 
 #include "tsSLList.h"
+#include "tsDLList.h"
 #include "tsFreeList.h"
 #include "epicsTime.h"
 
@@ -38,22 +39,22 @@ class tcpiiu;
 class bhe : public tsSLNode < bhe >, public inetAddrID {
 public:
     epicsShareFunc bhe ( const epicsTime &initialTimeStamp, const inetAddrID &addr );
-    tcpiiu *getIIU () const;
-    void bindToIIU ( tcpiiu & );
-    void unbindFromIIU ();
     epicsShareFunc void destroy ();
-    epicsShareFunc bool updatePeriod ( const epicsTime &programBeginTime, 
+   epicsShareFunc bool updatePeriod ( const epicsTime & programBeginTime, 
                         const epicsTime & currentTime );
     epicsShareFunc double period () const;
     epicsShareFunc void show ( unsigned level) const;
+    epicsShareFunc void registerIIU ( tcpiiu & );
+    epicsShareFunc void unregisterIIU ( tcpiiu & );
     epicsShareFunc void * operator new ( size_t size );
     epicsShareFunc void operator delete ( void *pCadaver, size_t size );
 protected:
     epicsShareFunc ~bhe (); // force allocation from freeList
 private:
-    tcpiiu *piiu;
+    tsDLList < tcpiiu > iiuList;
     epicsTime timeStamp;
     double averagePeriod;
+    void beaconAnomalyNotify ();
     static tsFreeList < class bhe, 1024 > freeList;
     static epicsMutex freeListMutex;
 };
@@ -72,9 +73,8 @@ private:
  * zero (so we can correctly compute the period
  * between the 1st and 2nd beacons)
  */
-inline bhe::bhe ( const epicsTime &initialTimeStamp, const inetAddrID &addr ) :
-    inetAddrID ( addr ), piiu ( 0 ), 
-    timeStamp ( initialTimeStamp ), averagePeriod ( - DBL_MAX )
+inline bhe::bhe ( const epicsTime & initialTimeStamp, const inetAddrID & addr ) :
+    inetAddrID ( addr ), timeStamp ( initialTimeStamp ), averagePeriod ( - DBL_MAX )
 {
 #   ifdef DEBUG
     {
@@ -85,26 +85,6 @@ inline bhe::bhe ( const epicsTime &initialTimeStamp, const inetAddrID &addr ) :
 #   endif
 }
 
-inline tcpiiu *bhe::getIIU ()const
-{
-    return this->piiu;
-}
-
-inline void bhe::bindToIIU ( tcpiiu &iiuIn )
-{
-    if ( this->piiu != &iiuIn ) {
-        assert ( this->piiu == 0 );
-        this->piiu = &iiuIn;
-    }
-}
-
-inline void bhe::unbindFromIIU ()
-{
-    this->piiu = 0;
-    this->timeStamp = epicsTime();
-    this->averagePeriod = - DBL_MAX;
-}
-
 #endif // ifdef bheh