Why not simply use "mii-tool"?
# /sbin/mii-tool eth0 -F 10baseTx-HD
If he wants to set it for full duplex, then change the HD to FD.
Likewise, "ethtool" will do the same for more recent versions.
Hope that helps.
KJ


Jeroen Geilman <jeroen@nospam.net> wrote in message news:<3ff4dee3$0$325$e4fe514c@news.xs4all.nl>...
> 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.