at&t 3b1, pc7300

SPC wrote: 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