This object holds the next sequence number the router will use when sending a data or control packet on this VPDN tunnel session, as tracked by the tunneling protocol (L2F/L2TP/PPTP). Administrators watch it, together with the peer's expected receive sequence, to confirm the session's packet numbering is advancing normally rather than stuck or wrapping unexpectedly, which would signal a session that has stalled. For example, if this value stops incrementing while traffic is still expected to flow through an established VPDN tunnel, that stall points to a problem with the session's sequencing state rather than the underlying IP path.