Cisco 2610 configuration for Point-to-Point T1

[RMCS]

Here is a diagram of my network:

I have 3 offices with a Cisco 2610 at each location. The main site has 2 T1 WIC cards, the other satellite offices only have 1 T1 WIC card. Only the main site (Site A) has an Internet connection; Site B & C need Internet access through Site A.

Network Subnets
Site A - 192.168.0.x
Site B - 192.168.1.x
Site C - 192.168.2.x

I have successfully configured an HDLC connection between Site A and B. Here are my router configs:

Router @ Site A

interface Ethernet0/0
ip address 192.168.0.254 255.255.255.0
no keepalive
!
interface Serial0/0
description connected to SITE B
ip unnumbered Ethernet0/0
service-module t1 remote-alarm-enable
!
interface Serial0/1
description connected to SITE C
ip unnumbered Ethernet0/0
service-module t1 remote-alarm-enable
!
router rip
version 2
network 192.168.0.0
no auto-summary
!
no ip http server
no ip http secure-server
ip classless
ip route 0.0.0.0 0.0.0.0 192.168.0.1

Router @ Site B

interface Ethernet0/0
ip address 192.168.1.254 255.255.255.0
no keepalive
!
interface Serial0/0
description connected to SITE A
ip unnumbered Ethernet0/0
service-module t1 remote-alarm-enable
!
router rip
version 2
network 192.168.1.0
no auto-summary
!
no ip http server
no ip http secure-server
ip classless

Now for my problems!!!

Everyone at Site A can access the Internet. They are configured with 192.168.0.254 as their default gateway which in turns gets routed to 192.168.0.1 when Internet access is required.

I can ping from Site A to ANY host at Site B.
I can ping from Site B to ANY host at Site A EXCEPT 192.168.0.1 which means no Internet access.
I have VOIP phones at Site B which connect just fine to the IP PBX (192.168.0.250) but there is no sound. Upon further investigation, the PBX receives the packets, but can't send them back to the phone - thus I believe I have a routing issue.

Can anyone help? Am I missing something in my config?

 

[gmac454]

I would reccomend you use EIGRP for routing rather than rip it will dynamically find your routes between the sites and will update only the changes to the routing tables, thus it is a much "quieter" routing protocol.

Gmac454

 

[plshlpme]

try setting the default route of router B to go to router A?

 

[ADB100]

What is the device 192.168.0.1? I assume some Internet Router or Host? How does the routing table look on this device? it will need the routes back to each of the remote site subnets through the Cisco router (192.168.1.0/24 via 192.168.0.254 etc). Also check the routing tables on each router to ensure they look OK. What is the default gateway on the IP PBX?

On another note why are you using unnumbered links? I can't remember the logic but I am sure RIP will have an issue with this since the neighbors are not on the same subnets. I would re-number the links with /30 subnets and enable a classless routing protocol such as OSPF or EIGRP:

!Router A
interface serial0/0
ip address 192.168.250.1 255.255.255.252
!
router ospf
network 192.168.250.2 0.0.0.0 area 0
network 192.168.0.254 0.0.0.0 area 0
passive-interface ethernet0/0
!

!Router B
interface serial0/0
ip address 192.168.250.1 255.255.255.252
!
router ospf
network 192.168.250.2 0.0.0.0 area 0
network 192.168.1.254 0.0.0.0 area 0
passive-interface ethernet0/0
!
etc


Andy

 

[plshlpme]

in the above.. make router b use 192.168.250.2
it was probably just a type-o...

 

[RMCS]

Thanks for all the response!

In answer to plshlpme: I tried making the default route on router B to be router A and that didn't help any.

In answer to ADB100: The device at 192.168.0.1 is a firewall, just a simple Linksys device right now, soon to be replaced with something more robust. I haven't checked the routes on the firewall, but all hosts at site A can ping the firewall and have Internet access; host at site B can't ping nor can they get on the Internet. The default gateway for ALL hosts at Site A is 192.168.0.254.

My next question is: What is a better routing protocol, EIGRP or OSPF? I have a sample OSPF config shown above by ADB100. Could someone provide a sample EIGRP config?

Thanks!