Jun 13, 2007

TCP Dup ACK Question - Ask Wireshark Packet capture running on a mirrored switchport, capturing all traffic on all VLAN in both directions. Packet capture shows a lot of TCP Dup ACK's. Could the packet capture being set up to capture traffic in both directions be causing this? 74079 24.614726 10.xx.xx.xx 10.xx.xx.xx TCP 78 [TCP Dup ACK 74061#4] 42900 → 80 [ACK] Seq=151 Ack=155475 Win=79680 Len=0 TSval=283933383 … “Bad TCP” Error in Wireshark│SEの道標 [TCP Fast Retransmission] As above, when TCP Dup ACK is resent three times (four times including first sent), Fast Recovery Algorithm of TCP works and opponent resent the packet required with Ack# without waiting for the RTO (Retransmission TimeOut).This mark will be displayed in packet what wireshark believes to have been retransmitted by this algorithm (Dup ACK is the third and within RTO) .

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

Feb 19, 2015 How to modify the TCP/IP maximum retransmission time-out Sep 18, 2013

Duplicate ack에 대한 처리 방법 문의 - TCP/IP 칩 - WIZnet Developer …

TCP Ack storm DoS attacks - ScienceDirect