Ask Your Question
0

Wireshark shows TCP Window full, but actually it is not

asked 2018-01-10 05:23:49 +0000

MSARUL gravatar image

Hello All, My device TCP window size is 1024. I`m transmitting data to the device from PC application. PC is sending 536 bytes of data at a time, Most of the times device is able to send ack and new window value just after this 536 bytes data reception. But sometimes the device is not able to send ack, within that PC is transmitting the next block, but PC application is smart enough to calculate the window size and it is sending about 488 bytes only this time (536 + 488 = 1024). Wireshark exactly captures this and shows TCP Window Full, this is fine. But after this my device sends ack and new window value (1024.) Then the PC application sends next 535 bytes. Wireshark shows TCP Window full this time too. But here the TCP Window has not reached its maximum value(1024). Why wireshark shows "TCP Window Full" for this too? Can anyone explain me the reason?

edit retag flag offensive close merge delete

Comments

Which version of wireshark is this? You should really share the capture file itself with us.

Jaap gravatar imageJaap ( 2018-01-10 06:40:00 +0000 )edit

1 Answer

Sort by ยป oldest newest most voted
0

answered 2018-01-10 08:44:38 +0000

MSARUL gravatar image

Hello Jaap, I have found the reason.

//But after this my device sends ack and new window value (1024.)// - This ack has not been sent for the 488 Byte block, but for the 536 byte block which had been sent before the 536 byte block. That`s why after getting the next 536 byte block wireshark shows "TCP Window is full".

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools

1 follower

Stats

Asked: 2018-01-10 05:23:49 +0000

Seen: 860 times

Last updated: Jan 10 '18