On 20-Dec-08, at 12:43 PM, Mike Pfaiffer wrote:
Dan Martin wrote:
This should be simple, but for some reason I can't get it working.
Should work. I did it before.
My present setup: shaw cable modem ----> linux box / iptables ----> airport extreme ----> a happy group of Mac & PCs, some wired, some wireless
Essentially your Linux box is a router.
Problem: My broker supplies me with software for streaming quotes that must run on XP and not be behind a firewall.
Solution (I thought): Use my old Allied Telesyn CentreCOM MR815T hub/repeater, and take advantage of the fact that Shaw will issue 2 IPs. shaw cable modem ----> hub port 1 |---------> linux box / iptables ----> etc, as before port 2 |---------> promiscuous XP box
If I connect either the network (my present system) or the XP box directly to the cable modem, each seems to work. If I connect either of these through the hub, it no longer works. A diode will light up showing the connection of a PC to a particular port, but will not light up when I plug in the ethernet cable from the cable modem. The hub will indicate activity when an attempt is made to access the internet, but no activity is registered on the cable modem.
Ah I think I see your problem. You touch on it later.
I have used different ports on the hub, 3 different ethernet cables to connect the modem to the hub, and at times I have rebooted the modem or the PC attached to the hub (various permutations of these actions).
The hub has 8 ports - the first 7 are labelled with an "X" which I believe means MDI-X (crossover) configuration to plug a PC into. Port 8 has a switch to select MDI or MDI-X. What should I plug the modem into? (I have tried both).
You use regular (not crossover) cables in the first seven.
To the best of my knowledge, none of my cables are crossover.
Port 8 can use either depending on the position of the switch. Your machines should connect to any of the first seven ports. The cable modem connects to port 8.
I assume the switch is set to "MDI" (unlike the "MDI-X" of the other ports, since the modem seems to behave like an "un-PC" in its connectivity - though the computer store guy said to use one of the regular ports). I don't know if this "uplink" port has any other special features other than the ability to select "MDI" vs "MDI-X". Does the hub expect traffic from this port to be directed to the other ports? I don't know if this hub has switching capabilities, but I expected that each port was equivalent to the others.
The other potential problem I can see at this point might be a break in a cable...
I tried 3 different cables - one of which I tested and appears to work when used to connect the modem to computer directly.
Later Mike
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Dan Martin GP Hospital Practitioner Computer Scientist ummar143@shaw.ca (204) 831-1746 answering machine always on