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----- Message from [EMAIL PROTECTED] on Tue, 11 Oct 2005 15:37:08 -0400 -----
To:
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Subject:
FDDI->Ethernet mirror/bridge?
I have the same questions too:
Any idea, how I can convert the FDDI to Ethernet and via versa.
"I want to take all traffic on the FDDI ring and
dump it over to the FastEthernet network."
Thanks,
Tru Le
([EMAIL PROTECTED])
General Dynamics
(W) 703 490 7548
On Thu, 27 Apr 2000, Tyler Allison wrote:
> Anybody have experience with using an OBSD boxes to create a low cost
FDDI
> to FastEthernet converter? I want to take all traffic on the FDDI ring
and
> dump it over to the FastEthernet network.
>
> I'm having the darndest time even finding a hardware solution for this
from
> any Vendor. Any ideas would be appreciated.
Technically, because FDDI can have enormous frame sizes, you can't
simply produce a "converted" - there's no way to do that at the DLC
layer.
IP, on the other hand, has a really neat feature called packet
fragmentation :-). But then, the device you're looking for is called a
"router" - and lots of people make those.
*IF* you can configure every single host on the FDDI ring to use a
framesize of no more than 1545 (?) bytes, then you can use a simple
bridge or media converter.
A media converter is not, strictly speaking, even theoretically
possible. A media converter simply translates the electrical
characteristics of a signal into some other form. For example, 10b2
(coax) ethernet to 10bT (twisted pair) ethernet conversion would use a
"media converter" - also commonly known as a "transceiver".
You're asking for the same type of device as an Ethernet-to-Token-Ring
converter. They only work under very strict conditions, and they wind
up operating (at least) like a bridge, at layer 2.
Take an OpenBSD box. Add one ethernet card. Add one FDDI card.
Configure the br0 device - there's been LOTS of discussion recently on
these lists about setting up bridge groups under OpenBSD.
If you want a standalone solution that you don't have to put together,
go to www.blackbox.com, and search (one at a time...) for these product
numbers, and you'll find a number of devices that may suit your needs:
LT0003A-4DMI, 38460, LT0002A, WS-C1924F-A, NP-1F-D-MM=
(note - those last two #s are actually Cisco product, which can probably
be found cheaper elsewhere)
Sorry, but ethernet and FDDI just aren't directly compatible. It's
definitely do-able (I've seen it done with FreeBSD, anyway) but there
are other solutions out there, too.
-Adam
--
Adam Thompson, MCNE, MCSE, CWT, A+
Vice-President / Chief Technology Officer, Commerce Design Inc.
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