i've got two computers with 100mbit ethernet cards and a router with a 10mbit card. they're all connected via a 10/100 hub. the two computers can ping each other but can't ping the router (or otherwise access the internet). would a switch allow the 100mbit computers to ping the router?
simple question
- Thread starter jhu
- Start date
Switch shouldn't make any difference, other than speeding your connection up between the two computers. Switch is just an upgraded hub. (Please don't stone me)
the router has 2 10mbit ethernet cards (one for the wan, other for the lan) and the other two computers have 10/100mbit cards. i can access the router (and internet) using a 10mbit hub but not with a 10/100mbit hub. what happens with the 10/100mbit hub is that the two computers with 10/100mbit ethernet cards can access each other but when the router is plugged into said hub, none of the computers can access it. the lights light up indicating that the hub detects the computers but that's it.
i guess my real questions are:
1) why are there interoperability problems between 10mbit cards and 100mbit cards on a hub that can do both?
2) is there any way around this without using a 10mbit hub or replacing the router (it's a '486 and 100mbit cards don's seem to be available for isa)?
1) why are there interoperability problems between 10mbit cards and 100mbit cards on a hub that can do both?
2) is there any way around this without using a 10mbit hub or replacing the router (it's a '486 and 100mbit cards don's seem to be available for isa)?
Check what type of cable you are using to connect the 10/100 hub with the router. If you don't have an uplink port on the hub you will need a straight through cable to make it work.
Take the cable from one of the clients and plug that into the router and just try to ping the router with just 1 computer hooked up but using the two cables you used for your clients. This should identify if it is a cable issue.
Other than that it could be your Autosensing on the hub is not working correctly.
When you hook up the router to the hub does the light come on like your other computers when hooked up to the hub.
Hubs just extend the wire at the Physical layer of the OSI model so unless you have a wiring or hardware problem there shouldn't be any other issues.
If your one 10mbit hub worked check to see how your wiring is setup and then if that paticular port is not autosensing correctly thus the mismatch in speed causing non-communication.
btw: there are 10/100 or 100 only mbit ISA cards.. we used to use ones from Intel hard to find now a day though.
Take the cable from one of the clients and plug that into the router and just try to ping the router with just 1 computer hooked up but using the two cables you used for your clients. This should identify if it is a cable issue.
Other than that it could be your Autosensing on the hub is not working correctly.
When you hook up the router to the hub does the light come on like your other computers when hooked up to the hub.
Hubs just extend the wire at the Physical layer of the OSI model so unless you have a wiring or hardware problem there shouldn't be any other issues.
If your one 10mbit hub worked check to see how your wiring is setup and then if that paticular port is not autosensing correctly thus the mismatch in speed causing non-communication.
btw: there are 10/100 or 100 only mbit ISA cards.. we used to use ones from Intel hard to find now a day though.
3Com also have the coveted 3C515-TX -- a 10/100 ISA card. Only problem is that the ISA bus can't take full advantage of the 100mbit speed. Oh well, ISA slots are a thing of the past for me, thank God. 
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