usdL2tpTunnelStatusSendSeqAck 1.3.6.1.4.1.4874.2.2.35.1.3.2.1.1.20

The send sequence number that the tunnel peer has acknowledged. The flow control state can be determined by subtracting the usdL2tpTunnelStatusSendSeq from usdL2tpTunnelStatusSendSeqAck and comparing this value to usdL2tpTunnelStatusSendWindowSize.