marcoagk

My office's LAN is like the following:

PC1 PC3
HUB---ROUTER---INTERNET
PC2 PC4

I can't see PC1 (or 2) from PC3 (or 4) or viceversa. Connection between
PC1 and PC2 is working, and so is between PC3 and PC4.
The ping command between them (PC1-2 to PC3-4) shows no connection. I
also have ping'ed the four computers from router successfully.
I have also created a (router's) firewall rule to allow any connection
with source and target in LAN, with no results.

All computers have windows XP, with file and printer sharing options.
All of them can connect to internet.
Besides, the four are in the same workgroup. The integrated firewall of
XP is disabled on each.

The router is D-Link DI-604.

I really need help making all machines "see" each other. help me,
please

Thanks in advance.

Marco

daytripper

If you do an ipconfig/all from each system console, do they all have ip
addresses in the same subnet? (they should - if that's really a hub)...

quandong nut

The DI-604 is a four-port device? Have you tried PC1/2 directly on the router
to see if they see PC3/4 that way?

Cable problem between router and hub?

marcoagk

daytripper ha escrito:

I think that you mean their IP, the 4 PC have ip addresses obtained by
DHCP (router), being all 192.168.0.1XX. The subnet mask is
255.255.255.0.

Thanks

marcoagk

quandong nut ha escrito:


Yes the router has 4 ports.
I'll try that configuration (4 pc on router) but I can't stay like
that, for physical limitations.

It seems there's no problem with the cable between router and hub,
because the four PC can connect to internet. Do you think that the
cable could be damaged in some way?

Expanding more my answer...
PC1 and 2 are located on another room, so I have extended a long cable
between router and hub and shorter to PCs. That's why I have that (odd)
configuration.

I really think that if I connect the four pc directly to router the
problems will be solved, but I can't figure why the configuration I
have doesn't work.

Thanks

daytripper

Ok, so all nodes are getting proper addresses and netmasks from the router.
That strongly suggests your problems have nothing to do with connectivity.
And, for what's it worth, there's no logical reason to create router rules for
this problem. As far as the router is concerned, it has four LAN nodes
appearing on its local ports.

Going back to your original post:

What does that last sentence mean? How does one ping a downstream node from a
router?

Can you ping from PC1 to PC3 using the destination ip address instead of PC3's
name? Or does that not work?

If pinging by number doesn't work, I suspect firewall behavior. Perhaps some
long-forgotten Zone Alarm install?

/daytripper

marcoagk

daytripper ha escrito:


The router has a ping utility accessible from web at 192.168.0.1.
Pinging by number to any of the 4 PC works ok.

pinging by name or ip number doesn't work between PC1-2 to PC3-4.
I suspect (bad) firewall behavior too, that's why I created a rule on
router's firewall that didn't work. I erased that rule because I was
only trying.

There's a pair of pc's, (say PC1 and PC3) that I have no doubts never
had a (software) firewall installed, so I'll focus my tests mainly on
them.

Thanks a lot.

budgie

No idea, but that is in the link where the interconnectivity issue appears, so
in principle I would have checked that ealy on. However in your other posts you
indicate all machines are successfully being assigned IP's by the DHCP server
(the604) so it appears OK.

I suspect it will work that way too, but again it is suggested only as a
diagnostic step.