[NTLUG:Discuss] what is the problem?

[Kelledin]

Your cable modem should be connected directly to a router, not 
sitting on a switch.  Having it sitting on your network like 
just another networked PC may work, it may not.  Even if it 
seems to work, it may force certain limitations.  If PCs on 
Switch A are able to reach PCs on Switch B (and vice versa), but 
not all of them can use the cable modem, this is likely to be 
your problem.  Your solution in this case would be to set up a 
router (preferably Linux on an old 486 with two Ethernet cards).

If PCs on Switch A are _not_ able to reach PCs on Switch B, then 
you need to check a few things:

1) See if disconnecting the cable modem allows the two switches 
to work properly together.
2) See if the uplink port being used requires a crossover 
connection (versus the more standard straight-through).  Some 
10baseT and Fast Ethernet switches require this; copper Gigabit 
switches should not.
3) Make sure the uplink port being used is actually set to work 
as an uplink port.  Most switches have a setting that can force 
the uplink port to work just like any other port.

On Monday 29 July 2002 01:33 pm, m m wrote:
> Hi All:
>
> I have a problem on internet connection, please help.
>
> switch A connect to cable modem, switch A is about 100-150
> feet aparts for PCs and switch B. the connection cable are two
> cat5 with inline receptacle. I can connect from network switch
> A to any of my PCs, it works. I use the same wire to connect
> to network switche A (regular) to Switch B (uplink), it does
> not work. the switch A light is on (indicate good), the switch
> B uplink light is blinking (indicates collusion) I use the
> same wire to connect to network switche A (uplink) to Switch C
> (regular), it does not work either. the switch A, the switch B
> lights are blinking (indicates collusion)
>
> any one have a clue?
>
> thanks.
>
>
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-- 
Kelledin
"If a server crashes in a server farm and no one pings it, does 
it still cost four figures to fix?"