Specifications

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VPN 3000 Series Concentrator Reference Volume II: Administration and Monitoring
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Chapter 15 Statistics
Monitoring | Statistics | PPTP
Transmit Octets
The total number of PPTP data octets (bytes) transmitted by this session.
Transmit Packets
The total number of PPTP data packets transmitted by this session.
Transmit ZLB
The total number of PPTP Zero Length Body acknowledgement packets transmitted by this session. ZLB
packets are sent as GRE acknowledgement packets when there is no data packet on which to piggyback
an acknowledgement.
ACK Timeouts
The total number of acknowledgement timeouts seen on PPTP data packets for this session. When the
system times out waiting for a data packet on which to piggyback an acknowledgement, it sends a ZLB
instead. Therefore, this number should equal the Transmit ZLB number.
Flow
The state of packet flow control for this PPTP session:
• Local = The local buffer is full. Packet flow for the local end of the session is OFF because the
number of outstanding unacknowledged packets received from the peer is equal to the local window
size.
• Peer = The peer buffer is full. Packet flow for the peer end of the session is OFF because the number
of outstanding unacknowledged packets sent to the peer is equal to the peer’s window size.
• Both = Both buffers are full. Packet flow for both ends of the session is OFF because the number of
outstanding unacknowledged packets is equal to the window size on both ends.
• None = Neither end of the session has a full buffer. Packet flow for the session is ON. This is the
normal operating state.