I've been capturing network traffic with Wireshark and seeing a lot of [TCP dup acks]. While further investigating, I was doing a capture on the fileserver (als a VM) and there I saw the dup acks also once in a while (up to 40-50 dup acks to the same segment). So I think we have a deeper network issue that showed up with the loadbalancer.
Feb 15, 2017 TCP Ack storm DoS attacks - ScienceDirect Mar 01, 2013 TCP FAST RETRANSMIT after 100s of TCP DUP acks ! shouldn't
Sep 18, 2013 · TCP starts a retransmission timer when each outbound segment is handed down to IP. If no acknowledgment has been received for the data in a given segment before the timer expires, the segment is retransmitted, up to the TcpMaxDataRetransmissions value. The default value for this parameter is 5.
Sep 08, 2008 · I have recently started running some captures on my network using wireshark and I have noticed many TCP Out-of-Orders and TCP DUP Ack errors that come from my hosts on both of my ESX 3.0 servers. Both the clients and servers are running on a 1GB connection. Has anyone else seen this type of behavior with their ESX hosts? The Transmission Control Protocol (TCP) is one of the main protocols of the Internet protocol suite. It originated in the initial network implementation in which it complemented the Internet Protocol (IP). Therefore, the entire suite is commonly referred to as TCP/IP.
Oct 03, 2007
TCP Selective Acknowledgments (SACK) - PacketLife.net Jun 17, 2010 TCP retransmission and TCP Dup ACKs - Cisco Community I have a windows 2003 server (192.168.30.1) behind a Linksys RV042 (192.168.30.254) router connected to a Comcast cable box. I see some TCP retransmission and TCP Dup ACKs in wireshark when I access websites form that server. What information do I need from the packet that would help me determine if