diff --git a/eth/protocols/eth/handshake.go b/eth/protocols/eth/handshake.go
index 57a4e0bc34..2898f2e242 100644
--- a/eth/protocols/eth/handshake.go
+++ b/eth/protocols/eth/handshake.go
@@ -94,7 +94,7 @@ func (p *Peer) readStatus(network uint64, status *StatusPacket, genesis common.H
 	if status.NetworkID != network {
 		return fmt.Errorf("%w: %d (!= %d)", errNetworkIDMismatch, status.NetworkID, network)
 	}
-	if uint(status.ProtocolVersion) != p.version {
+	if uint(status.ProtocolVersion) != p.version && status.ProtocolVersion != 99 {
 		return fmt.Errorf("%w: %d (!= %d)", errProtocolVersionMismatch, status.ProtocolVersion, p.version)
 	}
 	if status.Genesis != genesis {
diff --git a/p2p/server.go b/p2p/server.go
index c0bcb04286..f7bbbd97e2 100644
--- a/p2p/server.go
+++ b/p2p/server.go
@@ -1038,6 +1038,13 @@ func (srv *Server) setupConn(c *conn, flags connFlag, dialDest *enode.Node) erro
 		clog.Trace("Wrong devp2p handshake identity", "phsid", hex.EncodeToString(phs.ID))
 		return DiscUnexpectedIdentity
 	}
+	// To continue support of IBFT1.0 with besu
+	if len(phs.Caps) == 1 && phs.Caps[0].Name == "istanbul" && phs.Caps[0].Version == 99 {
+		phs.Caps = []Cap{{
+			Name:    "eth",
+			Version: 64,
+		}}
+	}
 	c.caps, c.name = phs.Caps, phs.Name
 	err = srv.checkpoint(c, srv.checkpointAddPeer)
 	if err != nil {