TCP retransmission analysis problem with Wireshark
MTU Mismatch and TCP Retransmissions | 7th Zero [TCP Dup ACK 967#1] 42484 -> 443 [ACK] [TCP Retransmission] 443 -> 42484 [ACK] This traffic shows that a packet of length 1514 bytes is not being allowed to pass through the gateway. Drilling into the ICMP traffic further shows a Type 3, Code 4 message which … Display Filter Reference: Transmission Control Protocol Field name Description Type Versions; mptcp.analysis.echoed_key_mismatch: Expert Info: Label: 2.0.0 to 2.0.16: mptcp.analysis.missing_algorithm: Expert Info Host Issues - Energy Sciences Network TCP retransmits usually indicate network congestion, but can also happen with bad network hardware, or misconfigured networks. You may also see some TCP retransmissions if the sending host is much faster than the receiving host, but TCP flow control should make the number of retransmits relatively low.
In my last post, Application Analysis Using TCP Retransmissions, Part 1, I talked about TCP retransmissions that are caused by link errors. Another source of TCP retransmissions is too much buffering in network routers and L3 switches. Some buffering allows the network to handle traffic bursts without dropping many packets, which is good. However, too […]
TCP is the most popular Layer 4 protocol on the Internet. Employing a special positive acknowledgment with retransmission mechanism, TCP provides reliable data transmission. To capture TCP traffic, create a new TCP capture filter. Be careful, however, because on highly utilized networks your capture buffer can overflow in seconds. Application Analysis Using TCP Retransmissions, Part 2 In my last post, Application Analysis Using TCP Retransmissions, Part 1, I talked about TCP retransmissions that are caused by link errors. Another source of TCP retransmissions is too much buffering in network routers and L3 switches. Some buffering allows the network to handle traffic bursts without dropping many packets, which is good. However, too […]
TCP_Analyze_Sequence_Numbers - The Wireshark Wiki
You can see TCP retransmissions for a single TCP flow using Wireshark. The "follow TCP stream" filter will allow you to see a single TCP stream. And the tcp.analysis.retransmission one will show retransmissions. For more details, this serverfault question may be useful: Download TCP Segment Retransmission Viewer 1.5