🚀 go-pugleaf

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The following information only applies to customers who have
Demon Solo, Demon Express, Demon Express Plus, Demon Express
Pro and Demon Express Gold ADSL connections to our services.

Customers connected via Demon Premier Express (Datastream) ADSL,
Dial-up and Leased Line are NOT affected.

We have been hearing a number of comments from our ADSL customers
that they are experiencing slow download speeds over their
connections.

Investigation has shown that this is a general problem affecting
all ADSL ISPs at the current time. We believe this is caused
because the default Maximum Transfer Unit (MTU) in Microsoft Windows
operating systems (1500 bytes) is greater than that in the
BT broadband IP network (1458 bytes), causing poor performance.

Along with other ISPs we are pursuing this issue with BT Wholesale
with the object of getting this problem resolved within the BT
network. BT have however issued the following statement:

   Following feedback from a number of Service Providers, it is
   understood that a common query from end users relates to
   'optimum network settings' that should be configured on their
   client servers or personal computers to maximise ADSL line
   performance. As such the following information is intended to
   assist Service Providers when advising their end users.  
   
   End user server or personal computer configurations can be a
   mixture of Windows (9x/2000/Me/NT/XP), MacOS or one of a number
   of UNIX variants. Each of these platform types and versions have
   tuneable network system parameters which can increase or decrease
   the perceived end user response time.
   
   Maximum Transfer Unit (MTU)
   ---------------------------
   
   The MTU is the default packet size (amount of data) that a system
   uses to send and receive information over a network. BT Wholesale
   believes that of the many network related system parameters,
   changing the MTU can, in some circumstances improve end user
   response times. It is advisable for end users to record their
   current settings in the event that they wish to change it back at
   a later date.
   
   BT Wholesale believes that the optimum MTU setting is 1458 as this
   is best suited to the performance of the broadband network. End
   Users may see an improvement in performance for some applications
   such as web browsing, FTP and peer-to-peer if they change their
   network setting to this level. 

Whilst BT advise us that our customers may need to make these
changes, regrettably the Demon Helpdesk will be unable to offer
assistance or support customers in changing their MTU settings.
Unfortunately, to the best of our knowledge, at this time there
are no authenticated end user tools available to make the
required changes.

Malcolm Muir
Demon Internet

- -- 
Malcolm S. Muir                                   Demon Internet Ltd.
Sunderland                                        322 Regents Park Road
England                                           London N3 2QQ


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