This is our old Q&A Site. Please post any new questions and answers at

I have noticed some strange packets with the "Window size scaling factor: -1 (unknown)". Is this a buffer full problem? I am seeing this on both the source and destination intermittently.

Thanks for your help in advance,

asked 26 Apr '12, 11:30

arpsalot's gravatar image

accept rate: 0%

edited 26 Apr '12, 14:48

Guy%20Harris's gravatar image

Guy Harris ♦♦

It just means that Wireshark doesn't KNOW the scale factor, most likely because it hasn't seen the SYN / SYN/ACK packets (where the options are negotiated). -1 is an artifical value meaning "unknown". So no, it is not a buffer full problem.

permanent link

answered 26 Apr '12, 11:40

Jasper's gravatar image

Jasper ♦♦
accept rate: 18%

Your answer
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here



Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text]( "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:


question asked: 26 Apr '12, 11:30

question was seen: 7,031 times

last updated: 26 Apr '12, 14:48

p​o​w​e​r​e​d by O​S​Q​A