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Old 9th September 2009, 21:01
carew86 carew86 is offline
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Default 3com 900B-TPC combo, BNC (thinnet or cheapernet) on debian

So I have this computer (let's call it coax) with a 3com 900B-tpc network card in it. The network card works fine when it is connected through rj45 (utp). But the card is capable of two connection types (rj45 and BNC). I have an thinnet switch that seems to work (never tested the BNC connection but the ethernet connectors works just fine). So I asked around for a 50ohm cable hooked it up like this:

-On both device's I have a T-piece connected (pc and switch).

-Between both is a coax cable and at each end is 50ohm terminator.

The problem is that debian can't get dhcp from the server. When I plug the rj45 cable into the switch and the pc everything works fine. I guess debian is asking for a ip on the wrong connector (?). This setup is just for learning purpose. If you have an idea on how to solve the problem please let me know. I appreciate any advice on this matter. I already searched the web but its a bit hard to get info or documentation on coax or cheapernet.

Here is more info on drivers and stuff (I left out irrelevant info):

# lspci
...
01:0b.0 Ethernet controller: 3Com Corporation 3c900B-TPC Etherlink XL [Cyclone] (rev 04)
# ifconfig
eth0 Link encap:Ethernet HWaddr 00:10:5a:f1:54:77
inet addr:192.168.1.114 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::210:5aff:fef1:5477/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:480 errors:0 dropped:0 overruns:0 frame:0
TX packets:177 errors:0 dropped:0 overruns:0 carrier:3
collisions:1 txqueuelen:1000
RX bytes:46506 (45.4 KiB) TX bytes:24997 (24.4 KiB)
Interrupt:11 Base address:0x6000
...
# uname -a
Linux coax 2.6.26-2-686 #1 SMP Wed Aug 19 06:06:52 UTC 2009 i686 GNU/Linux
# lsmod | grep 3c
3c59x 35624 0
mii 4896 1 3c59x
#

If any info needed let me know.

Thanks in advance,

Carew
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