diff --git a/router/java/src/net/i2p/router/transport/udp/EstablishmentManager.java b/router/java/src/net/i2p/router/transport/udp/EstablishmentManager.java
index 89076f9ce3..53e7e9d8dd 100644
--- a/router/java/src/net/i2p/router/transport/udp/EstablishmentManager.java
+++ b/router/java/src/net/i2p/router/transport/udp/EstablishmentManager.java
@@ -29,6 +29,7 @@ import net.i2p.router.util.DecayingBloomFilter;
 import net.i2p.util.Addresses;
 import net.i2p.util.I2PThread;
 import net.i2p.util.Log;
+import net.i2p.util.VersionComparator;
 
 /**
  * Coordinate the establishment of new sessions - both inbound and outbound.
@@ -126,6 +127,14 @@ class EstablishmentManager {
     /** for the DSM and or netdb store */
     private static final int DATA_MESSAGE_TIMEOUT = 10*1000;
     
+    /**
+     * Java I2P has always parsed the length of the extended options field,
+     * but i2pd hasn't recognized it until this release.
+     * No matter, the options weren't defined until this release anyway.
+     */
+    private static final String VERSION_ALLOW_EXTENDED_OPTIONS = "0.9.24";
+
+
     public EstablishmentManager(RouterContext ctx, UDPTransport transport) {
         _context = ctx;
         _log = ctx.logManager().getLog(EstablishmentManager.class);
@@ -356,8 +365,10 @@ class EstablishmentManager {
                         _transport.failed(msg, "Peer has bad key, cannot establish");
                         return;
                     }
+                    boolean allowExtendedOptions = VersionComparator.comp(toRouterInfo.getVersion(),
+                                                                          VERSION_ALLOW_EXTENDED_OPTIONS) >= 0;
                     state = new OutboundEstablishState(_context, maybeTo, to,
-                                                       toIdentity,
+                                                       toIdentity, allowExtendedOptions,
                                                        sessionKey, addr, _transport.getDHFactory());
                     OutboundEstablishState oldState = _outboundStates.putIfAbsent(to, state);
                     boolean isNew = oldState == null;
@@ -477,6 +488,7 @@ class EstablishmentManager {
             // Don't offer to relay to privileged ports.
             // Only offer for an IPv4 session.
             // TODO if already we have their RI, only offer if they need it (no 'C' cap)
+            // TODO if extended options, only if they asked for it
             if (_transport.canIntroduce() && state.getSentPort() >= 1024 &&
                 state.getSentIP().length == 4) {
                 // ensure > 0
diff --git a/router/java/src/net/i2p/router/transport/udp/OutboundEstablishState.java b/router/java/src/net/i2p/router/transport/udp/OutboundEstablishState.java
index 63497b5ea3..cfb0d2f577 100644
--- a/router/java/src/net/i2p/router/transport/udp/OutboundEstablishState.java
+++ b/router/java/src/net/i2p/router/transport/udp/OutboundEstablishState.java
@@ -56,6 +56,7 @@ class OutboundEstablishState {
     private RemoteHostId _remoteHostId;
     private final RemoteHostId _claimedAddress;
     private final RouterIdentity _remotePeer;
+    private final boolean _allowExtendedOptions;
     private final SessionKey _introKey;
     private final Queue<OutNetMessage> _queuedMessages;
     private OutboundState _currentState;
@@ -112,7 +113,8 @@ class OutboundEstablishState {
      */
     public OutboundEstablishState(RouterContext ctx, RemoteHostId claimedAddress,
                                   RemoteHostId remoteHostId,
-                                  RouterIdentity remotePeer, SessionKey introKey, UDPAddress addr,
+                                  RouterIdentity remotePeer, boolean allowExtendedOptions,
+                                  SessionKey introKey, UDPAddress addr,
                                   DHSessionKeyBuilder.Factory dh) {
         _context = ctx;
         _log = ctx.logManager().getLog(OutboundEstablishState.class);
@@ -125,6 +127,7 @@ class OutboundEstablishState {
         }
         _claimedAddress = claimedAddress;
         _remoteHostId = remoteHostId;
+        _allowExtendedOptions = allowExtendedOptions;
         _remotePeer = remotePeer;
         _introKey = introKey;
         _queuedMessages = new LinkedBlockingQueue<OutNetMessage>();
@@ -157,6 +160,9 @@ class OutboundEstablishState {
 
     /** @return -1 if unset */
     public long getIntroNonce() { return _introductionNonce; }
+
+    /** @since 0.9.24 */
+    public boolean isExtendedOptionsAllowed() { return _allowExtendedOptions; }
     
     /**
      *  Queue a message to be sent after the session is established.
diff --git a/router/java/src/net/i2p/router/transport/udp/PacketBuilder.java b/router/java/src/net/i2p/router/transport/udp/PacketBuilder.java
index 07f9ec3418..594388716b 100644
--- a/router/java/src/net/i2p/router/transport/udp/PacketBuilder.java
+++ b/router/java/src/net/i2p/router/transport/udp/PacketBuilder.java
@@ -784,6 +784,8 @@ class PacketBuilder {
      */
     public UDPPacket buildSessionRequestPacket(OutboundEstablishState state) {
         // TODO
+        // boolean ext = state.isExtendedOptionsAllowed();
+        // if (ext)
         //byte[] options = new byte[3];
         //UDPPacket packet = buildPacketHeader(SESSION_REQUEST_FLAG_BYTE, options);
         UDPPacket packet = buildPacketHeader(SESSION_REQUEST_FLAG_BYTE);