Very Computer

Hello out there -

Is there a formula or a generally accepted value for the
MTU (maximum transmission unit) for a slip at 28.8kbps?

I currently have it set at 588 (double the value of my
previous 14.4 value of 296).  That seemed quite small and
I figured the packet overhead would eat up much of the
increased performance.  Please let me know what your
opinion is -- even if you're not an expert :)

Dave

--

Quote:>Hello out there -

>Is there a formula or a generally accepted value for the
>MTU (maximum transmission unit) for a slip at 28.8kbps?

>I currently have it set at 588 (double the value of my
>previous 14.4 value of 296).  That seemed quite small and
>I figured the packet overhead would eat up much of the
>increased performance.  Please let me know what your
>opinion is -- even if you're not an expert :)

As we are using Netblazer as SLIP/PPP server, MTU is limited to 1500 for PPP
and 1006 for SLIP. I use myself SLIP with MTU of 1006 and got terrific transfer
rate: never below 3.3 Kbps and up to 10.5 Kbps (I got that transfering a 30 meg
file...) (that is with my workstation only 5 hops away). The down side of it is
sluggish telnet respond while I transfer, but then I just work localy.

Luc Desrosiers

says...

It depends on the output of your remote PPP/SLIP server. Some servers
will push out 1024 bits a time, like my present ISP does. So I can set my
MTU as 1024. Setting anything larger than the number your ISP recommends
will cause the incoming IP packets to fragment and this hurts the
perfomance.