Oups ! Yes, correct !
I completelly forgot to look at the bandwidth. I am too use to run test with
x Mbps...
> -----Original Message-----
> From: Johnson, Gregory LCDR [SMTP:[email protected]]
> Sent: Tuesday, February 15, 2000 3:39 PM
> To: Godard, Julien [HAL02:HM90:EXCH]; 'Testasecca, Mariano'
> Cc: '[email protected]'
> Subject: RE: Setting the appropriate MTU
>
> Bigger is not better for slow networks. For a link speed of 4kbps you will
> need to use much smaller MTU sizes since the transmission time for a
> packet
> gets too long otherwise. It will also depend upon what the latency is in
> the
> link because the total transmission time for a packet is a function of the
> size and delay. For a typical GEO link, I would expect that you have
> anywhere up to 600ms depending upon what kind of FEC and interleaving is
> done on the link. I have found for Inmarsat-M/Mini-M type links (2.4 kbps)
> that an MTU size of 500 works well. You also need to adjust the initial
> RTO
> value larger (the default is 3 secs, try 5 secs). If you don't do this,
> you
> will suffer a lot of timeouts and retransmissions. I'm not that familiar
> with the protocol Citrix uses, but with only 4kbps of bandwidth, you also
> don't want to run multiple simultaneous connections across your link as
> one
> connection will probably saturate the link.
>
>
> -Greg
>
> LCDR Gregory W. Johnson
> Ass't Prof. Electrical Engineering
>
> USCG Academy
> New London CT
>
> 860-444-8683
>
> -----Original Message-----
> From: Julien Godard [mailto:[email protected]]
> Sent: Tuesday, February 15, 2000 4:59 AM
> To: 'Testasecca, Mariano'
> Cc: '[email protected]'
> Subject: RE: Setting the appropiate MTU
>
>
>
> for performance, the bigger the better !
> But it may depend also on your network because you may want to avoid
> fragmentation.
> You can test your MTU with some free tools such as easyMTU
> http://members.tripod.com/~EasyMTU/ <http://members.tripod.com/~EasyMTU/>
>
> For example if you use ethernet link, the MTU is 1500, leading to 1448
> bytes
> of data in each segment (20 IP + 20 TCP + 12 TCP timestamp option + 1448
> data). If your router support this size without fragmentation, it's fine !
>
> -----Original Message-----
> From: Testasecca, Mariano [SMTP:[email protected]]
> Sent: Monday, February 14, 2000 7:49 PM
> To: '[email protected]'
> Subject: Setting the appropiate MTU
>
>
> What MTU value would be appropiate for Windows 95/98 terminals
> working as a
> Windows NT 4.0 running Citrix MetaFrame under
> a satellite link of a VSAT that provides 4kbps of bandwidth?
>
> Thanks to all.
>
> Mariano Testasecca
> SIEMENS S.A.
> Divisi�n Electromedicina
> Servicios de Salud - SHS
> Bolivar 177 1� Piso
> *+54-11-4340-8400 int. 2796
> * mailto:[email protected]
> <mailto:[email protected]>
>
>
>
>
>
>
>
This archive was generated by hypermail 2b29 : Tue Feb 15 2000 - 11:44:12 EST