6 Sep
2011
6 Sep
'11
4:22 p.m.
Thank you, Eric. And I must say ' good job', by the way (with the ARP).
Regards
Sergio
2011/9/7 Eric Smith <eric at brouhaha.com>
SPC wrote:
I have one 3b1 and one 3b2/400. I'm searching
for parts for the 3b1. More
exactly, one Lan Board,
There are two different, incompatible LAN boards.
1) There is a StarLAN 1 (802.3e, 1base5) adapter, which does 1 Mbps over
twisted pair, and is not compatible with anything but other StarLAN 1
products. This does NOT interoperate with any common 10Mbps, 100 Mbps, or
1Gbps Ethernet products. In other words, while it is technically a form of
Ethernet, it isn't really the kind of Ethernet that anyone actually uses.
The adapter uses an Intel 82586 chip. The software does not support
TCP/IP. This card is somewhat rare, and IMNSHO mostly useless.
2) There is a 10Mbps Ethernet adapter, using an AMD Am7990 "LANCE" chip,
with a kludgey TCP/IP stack from Wollongong. The board has an AUI
interface, so you'll need an external transceiver (e.g., 10base2 or
10baseT). This card is extremely rare. The software only supports IP Class
A/B/C addressing, and does NOT support subnets (or CIDR).
To deal with the 7300/3b1 and other hosts with ancient network stacks that
don't properly handle subnets, I added a "bozo-arp" feature to the Telebit
Netblazer router, and later wrote a daemon for use on a BSD or Linux box.
It works by automatically generating a proxy ARP response for any ARP
request received on an interface but not within the configured subnet for
that interface.
Eric