Send ACK to some out-of-order packets (fixes bug 1112 and part of 1256)

2011-12-03 14:02:19 -05:00
parent d349afb5e4
commit 89019eabf5
2 changed files with 5 additions and 0 deletions
--- a/src/aodv/test/tcp-chain-test-9-0.pcap
+++ b/src/aodv/test/tcp-chain-test-9-0.pcap
--- a/src/internet/model/tcp-socket-base.cc
+++ b/src/internet/model/tcp-socket-base.cc
@@ -683,6 +683,11 @@ TcpSocketBase::DoForwardUp (Ptr<Packet> packet, Ipv4Header header, uint16_t port
                    ":" << tcpHeader.GetSequenceNumber () + packet->GetSize() <<
                    ") out of range [" << m_rxBuffer.NextRxSequence () << ":" <<
                    m_rxBuffer.MaxRxSequence () << ")");
+      // Acknowledgement should be sent for all unacceptable packets (RFC793, p.69)
+      if (m_state == ESTABLISHED && !(tcpHeader.GetFlags () & TcpHeader::RST))
+        {
+          SendEmptyPacket (TcpHeader::ACK);
+        }
      return;
    }