Re: Routing table question.
- From: "Bill Grant" <not.available@online>
- Date: Tue, 18 Sep 2007 20:42:54 +1000
<clay.weeks@xxxxxxxxx> wrote in message
news:1190036839.082281.160640@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I have a point to point T1 anchored at each end with a Cisco 1720
Router. I also have a T1 line that goes to the internet. The servers
at either end have 2 NIC's each.
Site #1 looks like this:
Internet NIC:
ip 192.168.0.100
mask 255.255.255.0
gateway 192.168.0.1
Point to Point NIC:
ip 10.2.0.4
mask 255.255.255.0
I didn't put a gateway here because I found it caused more problems
and didn't solve any.
Point to Point routers
Site 1: 10.2.0.2 -> 10.0.0.1 -> Site 2: 10.0.0.2 ->10.1.0.2
Site #2 is set up like this.
Internet NIC:
192.168.50.2
255.255.255.0
192.168.50.1
Point to Point NIC
10.1.0.4
255.255.255.0
I know I need to make an entry into the routing tables to make the
point to point traffic use only the 10...etc NIC, but I'm not sure
about the syntax. Any help would be appreciated.
I think that you are looking in the wrong place for a solution to this
problem. If you have two gateways on a LAN, the problem is how you decide
which one to use by default (ie what you set as the default gateway for the
workstations on the LAN).
Am I correct in assuming that there are two routers on the LAN -- the
Cisco which links the two sites together across a T1 and your server which
is acting as an Internet gateway for the LAN? If that is the case, your
server does not handle the site to site traffic at all. It simply redirects
it to the Cisco. All your server does is act as an Internet gateway.
If you want to use the Internet, the Internet router must be set as the
default gateway. The problem is that, if you do that, nothing goes over the
point to point link. The routing on the point to point routers may be
correct but no traffic ever gets to them. The Internet traffic goes out OK
but the private traffic is dropped (because private IPs can't cross the
Internet).
To get the traffic for the other site across the point to point link you
need extra routing on the LAN to get this traffic to the correct router. You
can add a route to every machine on the LAN so that it sends the private
traffic traffic to the correct router. A simpler solution is to add a route
to the Internet router to "bounce" the private traffic for your other site
to the correct router (ie you use the same static route but you only have to
put it on one device).
Internet
|
server/router {static route 10.2.0.0 255.255.0.0 10.1.0.2}
10.1.0.4 dg blank
|
workstations
10.1.0.x dg 10.1.0.4
|
10.1.0.2
Cisco
|
T1 to site 2
And a similar setup at the other site.
All non-local traffic on each LAN will go to your Internet
server/router. Internet traffic will continue on through the router. Private
traffic (for the other LAN) will be bounced to the Cisco which will send it
over the T1 to the other site.
.
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