Question

Cisco router configuration

Asked by: janiemo

I'm putting in a point to point T1 from my boss's house to the office.  I don't have any other ISP options at his home.  We have a DIA T1 at the office and I'm buying 2 Cisco 1720 routers with the T1 WIC's.  Can anybody post a sample config based on the drawing attached?  What parts am I missing?

We have a managed router from ATT for the DIA circuit connected to an IPcop firewall.  I'm going to add a 3rd NIC to the firewall and connect the PtP T1 to the DMZ.  I don't want to drop the PtP directly onto the work network because there will be some home users connecting from his house.  Then he can RDP into the network through the open FW ports I've set up.

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Asked On
2009-11-05 at 13:35:10ID24876189
Tags

Cisco 1720

,

point to point T1

Topics

Networking Hardware

,

Network Routers

Participating Experts
1
Points
50
Comments
6

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Answers

 

by: mikecrPosted on 2009-11-05 at 13:55:14ID: 25754483

If you use a regular point to point T1 from the service provider, then the default configuration on the router should be sufficient. I'm assuming that your going to be using WIC-1DSU-T1 cards in the router with the built in CSU/DSU. You shouldn't need to configure anything on the interface except for an IP address.

Sample router 1 (Boss's house)

config t
int s0/0
ip address 172.16.1.1 255.255.255.252

int fe0/0
ip address 10.1.2.1 255.255.255.0

ip route 0.0.0.0 0.0.0.0 172.16.1.2

Sample Router 2 (Work)

config t
int s0/0
ip address 172.16.1.2 255.255.255.252

int fe0/0
ip address 10.1.1.1 255.255.255.0

ip route 10.1.2.0 255.255.255.0 172.16.1.1

On your router you will also need to add statements for your inside network hops as well or just add a default route with the next hop being the outside interface of the firewall DMZ. So if the DMZ interface was 10.1.1.5 lets say then you would put the following route on your network router:

ip route 0.0.0.0 0.0.0.0 10.1.1.5

Keep in mind the you will need to do return routing also to get to your Boss's router but if your default route sends you to the firewall, then you only need to add a route on the firewall to his network.

If you need anything else, let me know.

 

by: mikecrPosted on 2009-11-05 at 14:02:24ID: 25754541

Oh, I just noticed the access point at the Boss's house. If you need to route back through this device, you will need to add a route on the Boss's router, your network router, and the firewall to get to that network.

Boss's router

ip route 192.168.1.0 255.255.255.0 10.1.2.2

Network Router
ip route 192.168.1.0 255.255.255.0 172.16.1.1

Firewall route next hop for 192.168.1.0 should be 10.1.1.1.

Personally I would probably convert the multifuntion device to just an access point and use the router for any security. This will cut down on the network management by giving him wireless access but not have to worry about punching wholes in his firewall. You can get a WIC-4ESW for his router which is a 4 port switch, create a vlan on it with the 10.1.2.1 ip address and plug the access point into switch along with anything else he may want.

 

by: janiemoPosted on 2009-11-05 at 14:38:32ID: 25754883

Ok, so let's assume that I want to to be able to configure his router at his house from somewhere else (maybe just from the work network), is that where you were saying that I need to add routes back?  Sorry, I'm a SysAdmin and not all that well versed on routing and the OSI model, I think I probably ignored most of that during college and I'm kicking myself daily.

This all makes sense to me and the good thing is, that since this isn't production and he's not in a rush, I can take my time with it.

Perhaps I should see if ATT can hand off 2 ethernet connections from his managed router at the office and we can put one of the other 4 external IP addresses on the 1720.  Then he wouldn't be going through the work firewall at all, and could have an external IP address to NAT back to his home.

 

by: mikecrPosted on 2009-11-05 at 19:09:09ID: 25756319

That's kinda making it complicated, but you could do that if you wish. Yes, the routing I showed you would allow you to access everything on his network so you can manage it if needed. Personally, I would just save any live IP's that you have for a rainy day and just NAT him through the firewall. The last thing you want to do is give yourself more to manage if you don't have to.

 

by: janiemoPosted on 2009-11-18 at 07:25:05ID: 31650755

Great solution.  thanks for the help.

 

by: janiemoPosted on 2009-11-27 at 20:27:13ID: 25924052

OK, here is the combined configs of my 2 routers:  sorry if they blended together, they are named home and office.  no the passwords aren't really 123456

_________________START_______________

Office#sh start
Using 643 out of 29688 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Office
!
enable secret 5 $1$Suxb$JI4tw1wkufYuWRvotBHwB/
enable password 123456
!
memory-size iomem 20
ip subnet-zero
!
!
!
!
!
!
interface FastEthernet0
 ip address 10.1.1.1 255.255.255.0
 speed auto
 --More--          full-duplex
!
interface Serial0
 ip address 172.16.1.2 255.255.255.252
 no fair-queue
!
ip classless
ip route 0.0.0.0 0.0.0.0 192.168.2.1
ip route 10.1.2.0 255.255.255.0 172.16.1.1
no ip http server
ip pim bidir-enable
!
!
!
!
line con 0
line aux 0
line vty 0 4
 password 123456
 login
!
no scheduler allocate
end
 --More--         
Office#

Home#sh start
Using 570 out of 29688 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Home
!
enable secret 5 $1$nQvU$aq6OLpNkeCejEcaqj3cmm/
enable password 123456
!
memory-size iomem 20
ip subnet-zero
no ip routing
!
!
!
!
interface FastEthernet0
 ip address 10.1.2.1 255.255.255.0
 no ip route-cache
 speed auto
 --More--          full-duplex
!
interface Serial0
 ip address 172.16.1.1 255.255.255.252
 no ip route-cache
!
ip classless
no ip http server
!
!
line con 0
line aux 0
line vty 0 4
 password 123456
 login
!
no scheduler allocate
end

HastyHome#

_____END_________

20120131-EE-VQP-002

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