I wonder if Linux has a tool similar to trpt that we find under Free BSD. With trpt, you would be able to monitor the window size.
Another way would be to do a very simple hack on the tcp code.
Hope this helps.
-----Original Message-----
From: joe black [SMTP:[email protected]]
Sent: jeudi 18 janvier 2001 03:51
To: [email protected]; [email protected]; [email protected]
Cc: [email protected]
Subject: Re: RFC1323 Window scale behavior
Hi Marcus,
I'm from Uni Science M'sia. I have a few questions:
1) I would like to know if there is any tool to determine the TCP window size in Linux Redhat 6.2. (kernel 2.2.16)?
Or can I know the default window size? Also, is there any tool that can be used to control the window size??
2) If I enable TCP_WINDOW_SCALING, how can I know how big is the window size?
If any of you can help, I would be very grateful.
Rgds,
joe
-----Original Message-----
From: Markus Buchhorn [email protected]
Sent: Thu, 18 Jan 2001 11:08:05 +1100
To: [email protected], [email protected]
CC: [email protected]
Subject: Re: RFC1323 Window scale behavior
The Windows (NT4) ftp client has an option (-w) to set the buffer size for
transfers. This seems to work (it significantly increased performance on
our ATM network) (although on NT4 we can't go past 64k, of course).
C:\>ftp -?
[...]
-w:buffersize Overrides the default transfer buffer size of 4096.
Why, oh why, do they do this....
You haven't said anywhere how you are doing file transfers? ftp, smb, http,
... ?
Cheers,
Markus
At 16:23 17/01/01 -0500, Eric Travis wrote:
>
>Most likely your FTP client (and or server) is
>explicitly setting the send/receive buffers
>thus overriding the default values you tweaked.
>Do you have access to an alternative FTP client
>and/or server?
>
>Eric
>
>
>
>On Wed, 17 Jan 2001, JTEOIETF wrote:
>
>> Both client and server are configured to operate with
>> window scaling...Tcp1323opts = 1, tcpwindowsize = 524 k,
>> etc. During some SYN, ACK/SYN handshaking sequences,
>> the scaling option is on and at the correct scale factor.
>> Other times it is not...especially when I need it, such
>> as file transfer. Any other thoughts...
>
>
>
Markus Buchhorn, Faculty of Engineering and IT, | Ph: +61 2 61258810
email: [email protected], mail: CSIT Bldg #108 |Fax: +61 2 61250010
Australian National University, Canberra 0200, Australia |Mobile: 0417 281429
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