diff --git a/zebra/ChangeLog b/zebra/ChangeLog
index 5455046..c00ede3 100644
--- a/zebra/ChangeLog
+++ b/zebra/ChangeLog
@@ -1,3 +1,8 @@
+2007-04-10 Paul Jakma <paul.jakma@sun.com>
+
+	* ioctl{_solaris,}.c: (if_get_mtu) Ping clients via
+          zebra_interface_up_update if MTU is changed.
+
 2007-04-08 Paul Jakma <paul.jakma@sun.com>
 
 	* {ioctl,kernel}_null.c: Install of IP address should
diff --git a/zebra/ioctl.c b/zebra/ioctl.c
index 06be5be..ccb927a 100644
--- a/zebra/ioctl.c
+++ b/zebra/ioctl.c
@@ -155,6 +155,9 @@
   ifp->mtu6 = ifp->mtu = ifreq.ifr_mtu;
 #endif /* SUNOS_5 */
 
+  /* propogate */
+  zebra_interface_up_update(ifp);
+
 #else
   zlog (NULL, LOG_INFO, "Can't lookup mtu on this system");
   ifp->mtu6 = ifp->mtu = -1;
diff --git a/zebra/ioctl_solaris.c b/zebra/ioctl_solaris.c
index 2f05bf1..f68ea56 100644
--- a/zebra/ioctl_solaris.c
+++ b/zebra/ioctl_solaris.c
@@ -156,6 +156,7 @@
 {
   struct lifreq lifreq;
   int ret;
+  u_char changed = 0;
   
   if (ifp->flags & IFF_IPV4)
     {
@@ -170,12 +171,17 @@
       else
         {
           ifp->mtu = lifreq.lifr_metric;
+          changed = 1;
         }
     }
 
 #ifdef HAVE_IPV6
   if ((ifp->flags & IFF_IPV6) == 0)
-    return;
+    {
+      if (changed)
+        zebra_interface_up_update(ifp);
+      return;
+    }
     
   memset(&lifreq, 0, sizeof(lifreq));
   lifreq_set_name (&lifreq, ifp->name);
@@ -189,7 +195,11 @@
   else
     {
       ifp->mtu6 = lifreq.lifr_metric;
+      changed = 1
     }
+  
+  if (changed)
+    zebra_interface_up_update(ifp);
 #endif /* HAVE_IPV6 */
 }