Cell Relay Archive

["Kevin Fleming" <no@spamming.now>]

HiStefan,

>
>1) When MTU is set to 1500 an FTP of up to 500 kbytes/sec is possible
>when MTU is set to 9180 no connection is acquired.
When you say no connection, do you even get as far as FTP login stage, or
does the file transfer part fail ?  Maybe try a ping (from server to
client?) with incrementing packet size and see where the cutoff is...

I had a quick look on the web for tools which allow you to tweak the TCP/IP
protocols on Win 95 and NT4.  I came across the following:
http://www.fh-hamburg.de/pers/Lueddecke/win95/#System

There are utils there for changing the MTU values - I guess you have done
this properly since you sound like you know what you are doing ;-)


>2) ATM155 connected directly to ANx subrack

OK

>3) No extra measurement then FTP

Seems to work at MTU of 15000...


>4) Shaping is set to 8000/800kbps

OK
>
>It is my suspicion that it is the buffers that are not working at the
>site where the problem has occured.
>
>Do you any good PC or Unix SW that may find where the buffer overflow
>may be??

Unfortunately not.
>
>BR/Stefan

Hope this helps,
Regards,
Kevin.
(email firstintitalfleming@tinet.ie - change the first part - damn the
spam! )
>
>
>Kevin Fleming wrote:
>>
>> >(800kbps/8Mbps), and a Win95 with Efficient 25Mbps as a client.
>>
>> >
>> >Works great!!!
>> >Problem is I wanna reproduce a problem, when running a VoD service the
>> >system will not accept MTU 9180 at all when a downsizing to MTU 1500 the
>> >throughput is acceptable.
>>
>> Have you throttled the ATM25 NIC to less than 800kbps and the server side
to