Only relay IPv4, IPv6, Tor addresses

src/net_processing.cpp

@@ -1528,6 +1528,7 @@ void RelayTransaction(const uint256& txid, const uint256& wtxid, const CConnman&
 
 static void RelayAddress(const CAddress& addr, bool fReachable, const CConnman& connman)
 {
+    if (!fReachable && !addr.IsRelayable()) return;
 
     // Relay to a limited number of other nodes
     // Use deterministic randomness to send to the same nodes for 24 hours

src/netaddress.h

@@ -211,6 +211,14 @@ class CNetAddr
         friend bool operator!=(const CNetAddr& a, const CNetAddr& b) { return !(a == b); }
         friend bool operator<(const CNetAddr& a, const CNetAddr& b);
 
+        /**
+         * Whether this address should be relayed to other peers even if we can't reach it ourselves.
+         */
+        bool IsRelayable() const
+        {
+            return IsIPv4() || IsIPv6() || IsTor();
+        }
+
         /**
          * Serialize to a stream.
          */