TCP Spurious Retransmission

TCP-Retransmission

asked 2018-02-06 13:57:02 +0000

Anonymous

updated 2018-02-07 15:18:54 +0000

Jaap

13742 ●711 ●115

Could someone explain to me what's going on in this tcp dump ?

5   13:02:12.985389 5.5.5.5 1.2.3.4 TCP 74  57464 → 12345 [SYN] Seq=0 Win=29200 Len=0 MSS=1460 SACK_PERM=1 TSval=2535707980 TSecr=0 WS=128
6   13:02:12.985411 1.2.3.4 5.5.5.5 TCP 74  12345 → 57464 [SYN, ACK] Seq=0 Ack=1 Win=28960 Len=0 MSS=1460 SACK_PERM=1 TSval=1516508357 TSecr=2535707980 WS=1024
7   13:02:13.183362 5.5.5.5 1.2.3.4 TCP 66  57464 → 12345 [ACK] Seq=1 Ack=1 Win=29312 Len=0 TSval=2535708030 TSecr=1516508357
8   13:02:13.183806 5.5.5.5 1.2.3.4 TCP 66  57464 → 12345 [FIN, ACK] Seq=1 Ack=1 Win=29312 Len=0 TSval=2535708030 TSecr=1516508357
9   13:02:13.682592 5.5.5.5 1.2.3.4 TCP 66  [TCP Spurious Retransmission] 57464 → 12345 [FIN, ACK] Seq=1 Ack=1 Win=29312 Len=0 TSval=2535708155 TSecr=1516508357
10  13:02:13.982144 1.2.3.4 5.5.5.5 TCP 74  [TCP Spurious Retransmission] 12345 → 57464 [SYN, ACK] Seq=0 Ack=1 Win=28960 Len=0 MSS=1460 SACK_PERM=1 TSval=1516508607 TSecr=2535708155 WS=1024
11  13:02:14.180635 5.5.5.5 1.2.3.4 TCP 66  [TCP Dup ACK 7#1] 57464 → 12345 [ACK] Seq=2 Ack=1 Win=29312 Len=0 TSval=2535708279 TSecr=1516508357
14  13:02:14.285845 5.5.5.5 1.2.3.4 TCP 66  [TCP Spurious Retransmission] 57464 → 12345 [FIN, ACK] Seq=1 Ack=1 Win=29312 Len=0 TSval=2535708305 TSecr=1516508357
21  13:02:15.487487 5.5.5.5 1.2.3.4 TCP 66  [TCP Spurious Retransmission] 57464 → 12345 [FIN, ACK] Seq=1 Ack=1 Win=29312 Len=0 TSval=2535708606 TSecr=1516508357
25  13:02:17.894558 5.5.5.5 1.2.3.4 TCP 66  [TCP Spurious Retransmission] 57464 → 12345 [FIN, ACK] Seq=1 Ack=1 Win=29312 Len=0 TSval=2535709208 TSecr=1516508357
26  13:02:17.894580 1.2.3.4 5.5.5.5 TCP 54  12345 → 57464 [RST] Seq=1 Win=0 Len=0

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Can you provide the packet capture? See https://blog.packet-foo.com/2016/11/t... if you need to sanitize the packets first.

Christian_R ( 2018-02-07 19:44:48 +0000 )edit

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12.985 LxClient→ LxServr [SYN] Seq=0 Tsv=2535707980 TSe=0 WS=128 12.985 LxServr → LxClient[SYN, ACK] Seq=0 Ack=1 Tsv=1516508357 TSe=2535707980 13.183 LxClient→ LxServr [ACK] Seq=1 Ack=1 Tsv=2535708030 TSe=1516508357 13.183 LxClient→ LxServr [FIN, ACK] Seq=1 Ack=1 Tsv=2535708030 TSe=1516508357 13.682!LxClient→ LxServr [FIN, ACK] Seq=1 Ack=1 Tsv=2535708155 TSe=1516508357 13.982!LxServr → LxClient[SYN, ACK] Seq=0 Ack=1 Tsv=1516508607 TSe=2535708155 14.180!LxClient→ LxServr [ACK] Seq=2 Ack=1 Tsv=2535708279 TSe=1516508357 14.285!LxClient→ LxServr [FIN, ACK] Seq=1 Ack=1 Tsv=2535708305 TSe=1516508357 15.487!LxClient→ LxServr [FIN, ACK] Seq=1 Ack=1 Tsv=2535708606 TSe=1516508357 17.894!LxClient→ LxServr [FIN, ACK] Seq=1 Ack=1 Tsv=2535709208 TSe=1516508357 17.894!LxServr → LxClient[RST] Seq=1

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