How do I bridge/route between a 10 mbps hub and a 100 mbps hub?

How do I bridge/route between a 10 mbps hub and a 100 mbps hub?

Post by jiba_phanta.. » Wed, 09 Jun 1999 04:00:00



I have a 10 Mbps hub and a 100 Mbps hub (*not*
10/100, unfortunately), and I want to have devices
on each segment of my network be able to talk to
devices on the other hub.

Here are some specifics: I have a ppro-200 running
Linux (RedHat 6.0 + kernel 2.2.7) and containg two
ethernet cards - a 3com 3c509 (the 10 mbps one)
and a 3c59x (10/100). The 10/100 card is connected
to the fast hub, and the 10 mbps card is connected
to the slow hub (of course).

Now, how do I go about configuring the Linux
machine to route/bridge between these two
interfaces? Before I installed the 100 mbit hub,
everything was on the 10 mbit hub and was on the
network 192.168.1.0. I would like to make adding
the 100 mbps segment as transparent as possible;
i.e., I want to leave everything on 192.168.1.0 so
Windows users can play LAN games between the hubs
and so forth. The only perceptible difference
should be that the 100 mbps users have a faster
connection amongst themselves. Is there a way to
do this?

Schematic:

                       |--------|
                       |linux2.2|
        -- fast link - | server | - slow link --
        |              |--------|               |
        |                                       |
        |                                       |
    fast hub                              slow hub
    | | | | | |                       | | | | | |
    (fast devices)                  (slow devices)

goal: acts as one network (192.168.1.0)
can this be done?

Thanks for your time,
Patrick Hearon
Rice University

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1. HUBS: 100 Mbps vs 10/100 autosensing

I plan to set up a LAN with 3 machines (currently).  All will have 100
Mbps network cards, so I decided to purchase a 100 Mbps hub.  If for some
reason in the future I decide add machines with only 10 Mbps cards (simply
because it is cheaper), was this a bad decision to not get the 10/100
autosensing hub?  What will happen if I attach a machine that has < 100Mbs
card?

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