TCP Windows

new2net

Hey everyone,

Just had a quick question on TCP Windows. I'm looking at a capture and it goes something like this:

Packet 1 (from client):

Seq=1, ACK=480, Window=256, Len=0

Packet 2 (from server):

Seq=480, ACK=1, Window=260, Len=540

The connection has already been established and I'm just focusing on some of the actual data flow. In this example, the client sets a window size of 256. This tells the server that it can send 256 bytes before having to wait for an acknowledgement. If this is the case, why does the server respond with 540 bytes instead of 256?

The entire capture shows similar data. It appears the sender is sending more bytes than what is stated in the client window field. There aren't any discarded packets in the capture.

Any ideas?

Thank you.

mikeybinec

The server is saying I can accept this size