Help routing DSL through (2) 2501's serially. Please help me

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I have (2) Cisco 2501's and I need some help routing my ADSL dsl connection thru Router-A to Router-B. I have a 1900 switch too. My dsl router connects to Ethernet0 on the 2501-A and I am able to receive an internal ip address. I was able to find the configuration to dhcp from dsl router to Router-A take place.

Ethernet0 172.16.1.10 YES DHCP up up

Serial0 unassigned YES manual down down

Serial1 unassigned YES NVRAM administratively down down



Here is the configuration I found, however it was for a 2514 instead.



Current configuration : 1074 bytes
!
version 12.3
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service udp-small-servers
service tcp-small-servers
!
hostname Router
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
ip dhcp excluded-address 192.168.1.1
!
ip dhcp pool insideDHCP
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server 207.69.188.186 207.69.188.185
!
!
!
!
interface Null0
no ip unreachables
!
interface Ethernet0
description Facing the ISP
ip address dhcp
ip nat outside
no ip route-cache
no ip mroute-cache

interface Ethernet1
description Facing my LAN
ip address 192.168.1.1 255.255.255.0
ip nat inside
no ip route-cache
no ip mroute-cache

interface Serial0
no ip address
no ip route-cache
no fair-queue
!
interface Serial1
no ip address
no ip route-cache
shutdown
!
ip nat inside source list 1 interface Ethernet0 overload
ip http server
ip classless
!
!
access-list 1 permit 192.168.1.0 0.0.0.255
!
!
line con 0
line aux 0
transport input all
line vty 0 4
login
!
end



I tried to jeryrig this config to where the configurations ethernet0 would be my serial0, but no luck there.




Here are my "sh run"'s for both 2501's

Router-A

Current configuration : 989 bytes
!
version 12.3
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service udp-small-servers
service tcp-small-servers
!
hostname RouterA
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
ip dhcp excluded-address 192.168.1.1
!
ip dhcp pool insideDHCP
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server 207.69.188.186
!
!
!
!
interface Null0
no ip unreachables
!
interface Ethernet0
description Facing the ISP
ip address dhcp
ip nat outside
no ip route-cache
no ip mroute-cache
!

interface Serial0
description Facing my LAN
ip address 192.168.1.1 255.255.255.0
ip nat outside
no ip route-cache
no ip mroute-cache
clock rate 1000000
no fair-queue
!
interface Serial1
no ip address
no ip route-cache
!
ip http server
ip classless
!
!
!
!
line con 0
exec-timeout 0 0
line aux 0
transport input all
line vty 0 4
login
!
end






Sh run Router-B

Current configuration : 766 bytes
!
version 12.3
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service udp-small-servers
service tcp-small-servers
!
hostname RouterB
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
!
!
!


!
interface Ethernet0
ip address 10.0.0.1 255.255.255.0
ip nat inside
no ip route-cache
!
interface Serial0
ip address 192.168.1.2 255.255.255.0
no ip route-cache
no ip mroute-cache
no fair-queue
!
interface Serial1
no ip address
no ip route-cache
shutdown
!
router rip
network 10.0.0.0
network 192.168.1.0
!
no ip http server
no ip classless
!
!
!
!
line con 0
line aux 0
transport input all
line vty 0 4
login
!
end

Can you tell me if there is anything you would change? Thanks.

 

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I am going to hook this up this weekend and will post my configs for you.

 

cvg,

Do you have: 1) a DCE serial cable and 2) a DTE serial cable?

 

Thanks NetEyeBall, I would appreciate that a lot !

And yes R.H.Lee, I have all the right cables. Thanks again.

 

Does your DSL Modem run DHCP? I notice that your Router A has DHCP configured on it also. It may be worth setting the DSL router to a static address if this is the case.

 

The DSL router run dhcp and cant do static. I noticed when I log into the dsl router that it shows the individual mac addresses of the different interfaces I plug the router into via ethernet along with the lan ip address too.

 

In the configs listed you have no effective routing set up. One router is running rip, but that is useless since the other router has no routing protocol configured. More importantly, there are no static routes configured.

RouterA needs a default route to the Internet and a static route pointing back to RouterB for 10.0.0.0/24. Also, RouterA does not need to be running DHCP server service. RouterB needs a default route pointing to RouterA. This assumes the two routers have no problem communicating over the serial interfaces. First of all, confirm connectivity between the two routers, than add in the default and static routes. After that, you can experiment with various routing protocols if you want, but at a minimum you will need static routes for connectivity to the Internet.

Also, there are plenty of small things to clean up in the configs, but first get basic connectivity functioning correctly.

Spice_Weasel

 

cvg,

Question:

1. What are the names for the routers?

 

RouterA and RouterB

 

Spice_Weasel

Here is my setup

Hello

With this configuration I am able to ping anything I want from the remote computer. I have removed the 1900 switch from the equation and ran a crossover cable from E0 on the receiving router (Router-B) just to rid of any suspiciouns that it may be causing a problem..


Router-A (This is the router attached to the dsl modem)

Current configuration : 1096 bytes
!
version 12.3
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service udp-small-servers
service tcp-small-servers
!
hostname RouterA
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
ip dhcp excluded-address 192.168.1.1
!
ip dhcp pool insideDHCP
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server 207.69.188.186
!
!
!
!
interface Null0
no ip unreachables
!
interface Ethernet0
description Facing the ISP
ip address dhcp
ip nat outside
no ip route-cache
no ip mroute-cache
!
!
!
interface Serial0
description Facing my LAN
ip address 192.168.1.1 255.255.255.0
no ip route-cache
no ip mroute-cache
clock rate 500000
no fair-queue
!
interface Serial1
no ip address
no ip route-cache
!
ip nat inside source list 1 interface Ethernet0 overload
ip http server
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0
ip route 0.0.0.0 0.0.0.0 10.0.0.1
!
!
!
!
line con 0
exec-timeout 0 0
line aux 0
transport input all
line vty 0 4
login





Here is Router-B (This is the router that is being routed to from A)


Current configuration : 763 bytes
!
version 12.3
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service udp-small-servers
service tcp-small-servers
!
hostname RouterB
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
!
!
!
!
!
!
interface Ethernet0
ip address 10.0.0.1 255.255.255.0
no ip route-cache
!
interface Serial0
ip address 192.168.1.2 255.255.255.0
no ip route-cache
no ip mroute-cache
no fair-queue
!
interface Serial1
no ip address
no ip route-cache
shutdown
!
ip http server
ip classless
ip route 0.0.0.0 0.0.0.0 192.168.1.1
ip route 0.0.0.0 0.0.0.0 Serial0
!
!
!
!
line con 0
line aux 0
transport input all
line vty 0 4
login
!
end



Now the Lan Ip address on my DSL router is 172.16.0.254 and it give out ip addresses like 172.16.1.10, 172.16.1.11,172.16.1.12 etc..

When I tried to put a static route to this ip address 172.16.0.254, I was not able to ping to it, so I took it out. Thanks.

 

cvg,

Questions:

1. Is your DSL modem also a DHCP server?
2. Which serial port of RouterA is connected to which serial port of RouterB?
3. Which router's serial port is the DCE side of the serial cable connected to?

 

cvg, here are some quick changes for your config:

RouterA:
int s0
ip nat inside

access-list 1 permit 10.0.0.0 0.0.0.255


remove the existing default routes and replace with:

ip route 0.0.0.0 0.0.0.0 dhcp

Above default route will use gateway ip supplied from dhcp server. If that does not work, use:

ip route 0.0.0.0 0.0.0.0 <ip address of dhcp server>
(for example, ip route 0.0.0.0 0.0.0.0 172.16.1.1)
or
ip route 0.0.0.0 0.0.0.0 e0
Above route basically says, "Shove packets to unknown destinations out e0"

Also, add a route pointing back to your internal lan:

ip route 10.0.0.0 255.255.255.0 192.168.1.2

RouterB:
Remove:
ip route 0.0.0.0 0.0.0.0 Serial0

That should give you basic connectivity. Your pc on network 10.0.0.0/24 should be able to ping RouterA and reach the Internet. The access-list 1 determines what traffic is nat'ed. For example, from RouterB, type:
ping 132.246.168.148
The ping should fail as it will not be nat'ed by routerA
Type:
ping 132.246.168.148 sou e0
And it should succeed as it will be nat'ed.

Also, you can add the following to RouterB:
int e0
ip tcp adjust-mss 1492

This will ensure the correct mss for tcp sessions.
If there are still problems post back with more info.

As I mentioned, there are lots of things to add/change in the config, but get basic connectivity first.


Spice_Weasel

 

Spice_Weasel

Thank you so very much for your reply.

I got an email from an individual who already had an existing configuration. This is what he sent. Except his deal was 2x2514's


Router A - this is the router that connects to the DSL router via ethernet...


Current configuration : 1270 bytes
!
version 12.3
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service udp-small-servers
service tcp-small-servers
!
hostname RouterA
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
ip dhcp excluded-address 192.168.1.1
!
ip dhcp pool insideDHCP
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server 207.69.188.186
!
!
!
!
interface Null0
no ip unreachables
!
interface Ethernet0
description Facing the ISP
ip address dhcp
ip nat outside
no ip route-cache
no ip mroute-cache
!
interface Ethernet1
no ip address
no ip route-cache
!
interface Serial0
description Facing my LAN
ip address 192.168.1.1 255.255.255.0
ip nat inside
no ip route-cache
no ip mroute-cache
clock rate 500000
no fair-queue
!
interface Serial1
no ip address
no ip route-cache
!
ip nat inside source list 1 interface Ethernet0 overload
ip http server
ip classless
ip route 10.0.0.0 255.0.0.0 Serial0
!
!
access-list 1 remark RFC1918 non-routable address space
access-list 1 permit 192.168.0.0 0.0.255.255
access-list 1 permit 172.16.0.0 0.15.255.255
access-list 1 permit 10.0.0.0 0.255.255.255
!
!
line con 0
exec-timeout 0 0
line aux 0
transport input all
line vty 0 4
login
!
end






Here is Router-B (This router is connected via Serial0 to Router-A's Serial0 running HDLC not PPP...)



Current configuration : 726 bytes
!
version 12.3
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service udp-small-servers
service tcp-small-servers
!
hostname RouterB
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
!
!
!
!
interface Ethernet0
no ip address
no ip route-cache
no ip mroute-cache
!
interface Ethernet1
ip address 10.0.0.1 255.255.255.0
no ip route-cache
!
interface Serial0
ip address 192.168.1.2 255.255.255.0
no ip route-cache
no ip mroute-cache
no fair-queue
!
interface Serial1
no ip address
no ip route-cache
shutdown
!
ip http server
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0
!
!
!
line con 0
line aux 0
transport input all
line vty 0 4
login


He also gave me this below and it's for adding more routers via serial interface...


A)

router ospf 100
network 192.168.1.0 0.0.0.255 area 0
default-information originate always
!

B)

router ospf 100
network 192.168.1.0 0.0.0.255 area 0
network 192.168.2.0 0.0.0.255 area 1
redistribute connected subnets
!

C)

router ospf 100
network 192.168.2.0 0.0.0.255 area 1
redistribute connected subnets


He told me to just follow that format, and if I do decide to, then to leave the existing configuration alone and just implement OSPF. I have tried this with 3 routers using 12.3 and went to add another that was running 12.1 and the 12.1 ios router didn't work. So Ill need to upgrade that one. Thanks again for your help. I appreciate it...