A writable true/false setting that enables sequence number generation on this tunnel's packets when set to true; it defaults to false and is not supported on DVMRP tunnels. Admins enable it when they need the tunnel to help detect packet reordering or loss end-to-end, at the cost of a small amount of added per-packet overhead. Setting juniIpTunnelSequenceNumbers to true(1) on a GRE tunnel would have the router stamp outgoing tunnel packets with sequence numbers so the far end can detect drops or reordering.