What does TCP spurious retransmission mean in Wireshark?
Basically “Spurious Retransmission” means that data was sent again that the receiver had already acknowledged, which is something that we used to call “needless retransmission” in our own expert system. “
What is TCP spurious transmission?
TCP Spurious Retransmissions – These are the retransmissions in which the receiver acknowledged the packet but not before the Sender retransmits the packet due to an RTO. Wireshark catches these because it sees an ACK for the Packet sent but the sender retransmits the packets anyways so wireshark sees the packet twice.
Why are packets marked as spurious in Wireshark?
Let’s take a look at the reason those packets are marked as Spurious Retransmissions. Spurious Retransmissions are one’s that are considered unnecessary — in Wireshark, a retransmission is marked as “spurious” when Wireshark has seen the ACK for the data already.
How to detect spurious retransmissions in TCP trace file?
The Wireshark Expert offers a fast way to detect Spurious Retransmissions in a trace file. That little circle in the bottom left corner of the Wireshark window is the Expert button. Here’s what Wireshark Expert displays for our tcp-spurious-retran.pcapng file.
Are there any spurious retransmissions for this blog?
Not much else happens after that and the client abruptly terminates the TCP connection. We are focusing on the Spurious Retransmissions in this trace file. This trace file contains only 22 packets. I filtered all other traffic from view before saving so that we could focus only on Spurious Retransmissions for this blog.
Why are frames 14 and 20 marked as spurious retransmissions?
Frames 14 and 20 are marked as Spurious Retransmissions in this trace file. Let’s take a look at the reason those packets are marked as Spurious Retransmissions. Spurious Retransmissions are one’s that are considered unnecessary — in Wireshark, a retransmission is marked as “spurious” when Wireshark has seen the ACK for the data already.