Ben B wrote:
> Does anyone know how to change the network interface setting in Linux?
> <---------100Mbps------------>
> PC1 <------->Switched Hub<------->PC2
>
> For instance, I would like to change the link (PC1 to PC2) from 100Mbps
> downto 1Mbps.

You can't.
Fast Ethernet has two link speeds, normal (10mbit) and fast (100mbit).

You can easily force the segment to run on 10mbit by forcing one
interface to 10mbit and setting the other to auto (default), but to slow
it down any more you'll have to apply bandwidth throttling.

No, I'm not contradicting myself - your question was "I want to change
the *link* speed" - which you can't.

Limiting the bandwidth is certainly possible, see Ben's reply.

I'm none too sure about the advisability of lowering the tcp buffer
size, since this may well have adverse side-effects.