Basically, we have two fully functional networks, both with Cisco 1720
routers. We want to keep the networks separate and only want to be able to
use a single T-1 instead of separate T-1s. Both routers and T-1
connections are in the same wiring closet. What I would like to do is use
some sort of switch for both routers to plug into and from the switch, plug
into the single T-1. We originally had their network connected to our and
had all sorts of issues between our NT4 servers and their Win2K servers,
which is why they went with a separate router and T-1.
HTH,
Pat
Pat Marshall
Systems Administrator
Microsoft Certified Professional
Flying Rhinoceros
1440 NW Overton Street
Portland, OR 97209
(503) 552-8700
(503) 221-7282 (Fax)
Steven.Beckwith@lsa
-assoc.com To: "NT System Admin Issues"
<[EMAIL PROTECTED]>
09/28/01 02:01 PM cc:
Please respond to Subject: RE: Router connection
issue
"NT System Admin
Issues"
I don't know what a white Russian is but it sounds good for a Friday.
Don't start a whole discussion on it - enough noise already.
1) the T-1 is a digital line that connects to a CSU/DSU (serial connection)
on your router. As Jason points out, CSU's can be internal or external and
I suspect you have an internal WIC card similar to his set up which is why
there may be confusion.
Although you may have an RJ-45 connector and a regular patch cord (you
could actually use a regular phone line), it is NOT an ethernet type
connection, so only one router can host this connection (You could opt for
a THIRD router in your solution).
2) you are also going to need to know about how many "real" (outside) IP
addresses you have and whether you intend to "share" them (NAT - Network
address translation) or whether you will "redirect" them (PAT - Port
address translation).
A few other questions come to mind. Is there any inbound traffic that needs
to be directed to a specific box (www, smtp) i.e. Do you or the other
company want to have exchange servers or web servers accessible from the
internet (in which case you will need dedicated static outside IP addresses
for each service) or do you both still get mail via pop3, (in which case
maybe you can get by with NAT). How many nodes each office, what types of
routers are these?
I like the idea of sharing resources to keep costs down, but I need to say
AMEN to the Firewalling suggestion, esp. to protect your network from
theirs and vice versa (as well as obviously - the outside).
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Friday, September 28, 2001 1:30 PM
To: NT System Admin Issues
Subject: Router connection issue
-----Original Message-----
From: Jason Morris [mailto:[EMAIL PROTECTED]]
Sent: Friday, September 28, 2001 1:47 PM
To: NT System Admin Issues
Cc: '[EMAIL PROTECTED]'
Subject: RE: Router connection issue
Where is the csu/dsu in your layout? You need one of them to talk from the
t1 to the router. All of my routers were purchased with the WICT1-DSU
built
in so I just terminate there. If you have an external csu like from Adtran
you need the cable going from the csu to the router, depending on the
interface.
Here's what I would recommend to segment the networks from each other.
Make
sure your router has 2 ethernet ports, set one port up on their network and
the other on your network. Setup a loopback port and route anything going
from network A to network B to that loopback and vice versa, but anything
going to and from the Internet would be routed properly.
Also....it's really really really necessary to setup some sort of firewall.
Perhaps that's where you can do your routing from network to internet.
Setup a Linux box with 3 NICs, 1 for each network and 1 for the internet
router. Setup the firewalling and away you go.
If you need more help, feel free to contact me directly.
Jason Morris CCDA CCNP
Network Administrator
MJMC, Inc.
708-225-2350
[EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Friday, September 28, 2001 3:30 PM
To: NT System Admin Issues
Subject: Router connection issue
Hi Everyone,
I've been a lurker for quite a while (learning bunches), but now I have a
problem that totally confounds me.
There are two companies in the building where I work. Each company has a
separate network connected through a separate Cisco router to a T-1. For
financial reasons, the two companies have agreed to share a single T-1.
What I would like to do is have a switch that both routers plug into, and
which then uplinks to the single T-1. We do not want to co-mingle the
networks. According to Cisco's documentation, it is a straight-through
cable from the router to the T-1. If I connect the switch or a hub between
our router and its T-1, I get an alarm on the router and no connection
lights on the switch/hub. I've also tried using a crossover cable with the
same effect and have tried using/not using the uplink port on the
switch/hub. Have also tried restarting the router between connection
changes. What am I missing? I'm ready to give up and head to the nearest
bar for a pitcher of White Russians.
TIA,
Pat
Pat Marshall
Systems Administrator
Microsoft Certified Professional
Flying Rhinoceros
1440 NW Overton Street
Portland, OR 97209
(503) 552-8700
(503) 221-7282 (Fax)
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