Multiple daisy-chained routers

[Guest]

I have 3 routers daisy-chained. All computers can access the internet, but computers cannot see each other except on their own hubs. I can ping from a computer on hub 3 to one on hub 1 without any problems. I can't do the reverse. Hub 1 computer is XP Pro, hub 3 computer is ME. Any ideas on where to start?

 

[allan grossman [mvp]]

Hi, Ron -

You'll need to open ports 135, 137-139 and 445 for both
TCP and UDP traffic - but *don't* open them on the router
that's directly connected to the Internet, only the two
routers that are daisychained off the first. Then
everyone should be able to see each other and as long as
you leave the ports closed on the gateway router you
should still be reasonably secure.

Hope this helps -

-----Original Message-----
I have 3 routers daisy-chained. All computers can access

the internet, but computers cannot see each other except
on their own hubs. I can ping from a computer on hub 3 to
one on hub 1 without any problems. I can't do the
reverse. Hub 1 computer is XP Pro, hub 3 computer is ME.
Any ideas on where to start?

 

[Steve Winograd [MVP]]

I have 3 routers daisy-chained. All computers can access the internet, but computers cannot see each other except on their own hubs. I can ping from a computer on hub 3 to one on hub 1 without any problems. I can't do the reverse. Hub 1 computer is XP Pro, hub 3 computer is ME. Any ideas on where to start?

By design, a home broadband router acts as a firewall, preventing
computers on its WAN side (the Internet) from accessing computers on
its LAN side (your local area network). It allows computers on the
LAN side to access the Internet.

If you've daisy-chained the routers by connecting the WAN port of one
to a LAN port on the next one, then:

1. Hub 2 thinks that hub 1 is the Internet and prevents hub 1 from
accessing hub 2 computers, and:

2. Hub 3 thinks that hub 2 is the Internet and prevents hub 2 from
accessing hub 3 computers.

The solution is to use hub 2 and 3 as hubs only, bypassing their
routing capability. To do that:

1. Disable each router's built-in DHCP server, and:

2. Connect hub 2 to a LAN port on hub 1. Connect hub 3 to a LAN port
on hub 2. You might need to use an uplink port on one of each pair.
Don't connect anything to the WAN port on hub 2 or hub 3.
--
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

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