5912 only static peers

src/Nethermind/Nethermind.Network/Config/INetworkConfig.cs

@@ -100,4 +100,7 @@ public interface INetworkConfig : IConfig
 
     [ConfigItem(DefaultValue = "false", HiddenFromDocs = true, Description = "[TECHNICAL] Disable feeding ENR DNS records to discv4 table")]
     bool DisableDiscV4DnsFeeder { get; set; }
+
+    [ConfigItem(Description = "Whether to enable the node discovery. If disabled, Nethermind doesn't look for other nodes beyond the specified nodes.", DefaultValue = "true")]
+    bool DiscoveryEnabled { get; set; }
 }

src/Nethermind/Nethermind.Network/Config/NetworkConfig.cs

@@ -13,6 +13,7 @@ public class NetworkConfig : INetworkConfig
         public string? DiscoveryDns { get; set; }
 
         public bool OnlyStaticPeers { get; set; }
+
         public bool IsPeersPersistenceOn { get; set; } = true;
 
         [Obsolete]
@@ -40,5 +41,9 @@ public class NetworkConfig : INetworkConfig
         public int ProcessingThreadCount { get; set; } = 1;
         public string? ClientIdMatcher { get; set; } = null;
         public bool DisableDiscV4DnsFeeder { get; set; } = false;
+        public bool DiscoveryEnabled {
+            get { return DiscoveryEnabled; }
+            set { if (OnlyStaticPeers == true) value = false; else value = true; }
+        }
     }
 }

src/Nethermind/Nethermind.Network/PeerManager.cs

@@ -720,6 +720,9 @@ private void ProcessIncomingConnection(ISession session)
                 // TODO: here the session.Node may not be equal peer.Node -> would be good to check if we can improve it
                 session.Node.IsStatic = existingPeer.Node.IsStatic;
             }
+            if (!_networkConfig.DiscoveryEnabled && !session.Node.IsStatic) {
+                return;
+            }
 
             if (_logger.IsTrace) _logger.Trace($"INCOMING {session}");