building a switch or bridge

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Can one build a switch or bridge with multiple network cards?  Standard
switches will not do what I need.

I saw a posting somewhere a few days ago (might have been years old
from an unrelated search) but I can't find it now.  The standard answer
was "go buy a switch on Ebay, its cheaper".  I agree that would be true
for a pure ethernet switch.  Actually, I think the original poster of
that thread wanted to do additional address filtering he thought was
not available on inexpensive commercial swtiches.

However, I would like to make a bridge between token ring and ethernet.
 The bridge currently being advertised on Ebay has no ethernet module
(it's half a bridge that only goes halfway across the gulf).  Buying
one elsewhere would be several hundred dollars.  I have ethernet and
token ring cards and computers I could load linux onto.

Maybe could use the same machine for RARP and TFTP which I need to set
up too, since my linux firewall doesn't supply those services.  Yes, I
could add them to the present firewall, but I was hoping to move to a
CDROM/Floppy firewall and get rid of the hard disk in that system.

About 6 months ago I saw a listing on ebay for a cable adapter, plug it
into a TR hub and plug an ethernet computer into it.  Once I got my
token ring equipment and hub, I could not find it any more.  If anybody
can point me to an inexpensive divice like that, and if it would work
(maybe it has its own MAC address and truly only works for one ethernet

Re: building a switch or bridge

sqrfolkdnc wrote:
[snip: need TR-Eth bridge]

Do you really really really need a bridge?  Why can't you route?

Bridging between TR and Ethernet is not a very good idea.  

Try searching for ka9q.  I recall it had an option to bridge between TR
and Ethernet.



"Somehow I imagined this experience would be more rewarding" Calvin
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Re: building a switch or bridge

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What sort of problems might one encounter?

David Brownridge

Re: building a switch or bridge

With Linux, this is easely done. You can bridge (swithing) or route between
any technology

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