On 17 Apr 2002, at 0:44, Chan Fan Chong wrote:

>  1. I am using a small LAN (2 PCs with a hub). I am connect the router
> to my hub with a     straight/normal cable.

  So far, so good.

>  2. I do not know the address (Factory default 192.168.1.1)
>     My PCs ( 192.168.100.50 and 192.168.100.99. Both subnet
> 255.255.255.0 )
>
>  3. I try to ping from 192.168.100.50 to 192.168.1.1 (router)

  The subnet mask 255.255.255.0 means that both PCs regard themselves
as being on the 192.168.100.0 network.
  Since the default address on the router is 192.168.1.1, it is
*probably* also taking a default subnet mask of 255.255.255.0 (this
is the "natural" mask for that address), and so it thinks it's on the
192.168.1.0 network.

  To get packets from the 192.168.100.0 network to the 192.168.1.0
network, you need a router that joins them.  There isn't one, so the
PCs and your router don't see each other.

  Assuming that the router is still set for its default address -- or
that you can find how to *reset* it to the "factory default
settings"(*) -- then if you change the PC addresses to 192.168.1.50
and 192.168.1.99 (don't change the subnet mask), they should be able
to then see the router at 192.168.1.1 because they'll all be on the
192.168.1.0 network.  This should enable you to access the
configuration "web site" on the router.
  Note that you'll want to set the default gateway on each PC to
192.168.1.1, telling them that all traffic to other networks (such as
across the internet) should be sent via the router.

David Gillett


(*)  On many small appliance devices like this, there is a small hole
which may be labelled "RESET".  You need to turn the unit off, insert
a straightened paperclip into the hold (to press a microswitch -- you
should be able to feel it), and continue to hold it pressed while
turning the unit back on (and for several seconds thereafter.  You
will usually see some pattern of flashing of the LEDs indicating that
it is erasing the user configuration, if any, and reverting to the
defaults stored in ROM.

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