Trouble with Lab 13.1

[JacopeX]

I cannot ping ISP to Lab C router. They are both in the same subnet and range, I don't see why they cannot ping. Can it be the interfaces? [/URL]

Here is my topology on PAcket Tracer.

[URL]http://www.megaupload.com/?d=PJK5146W (http://www.megaupload.com/?d=PJK5146W)

Help would be much appreciated here. Thank you.:)

[Scottmeup]

I'm in the same scenario. Without looking at your topology, I think there might be a typo on the page. Here's why: the book lists the line passive-interface s0/2 as part of the configuration for Lab_A. Todd explains that this will prevent RIP updates from propagating back to the ISP router connected on that interface.
From what I can see in the configuration, you should be able to ping from ISP to Lab_A, Lab_A to Lab_C and Lab_C to ISP.
Anyone else care to weigh in on the topic?

[Scottmeup]

Update: I have another problem with the lab. I can't ping ISP from any router that isn't directly attached to ISP. Inspection of the routing table from Lab_C shows:

R 171.16.0.0/16 [120/2] via 192.168.30.1

The lab description of ISP shows that it should be a /24 but RIP is sending it as a /16. I have tried setting network 171.16.10.0 in router rip but it automatically gets changed to 171.16.0.0 in the running config

[lammle]

did you configure the "no auto-summary" command?
Todd

[Scottmeup]

Thanks for the reply Todd. I didn't have no auto-summary configured previously, I have now but the results are the same. My RIP configuration now looks like this


router rip
version 2
passive-interface Serial0/0/0
network 171.16.0.0
network 192.168.20.0
no auto-summary


The last commands I ran in RIP were
Lab_A(config-router)#no network 171.16.0.0
Lab_A(config-router)#network 171.16.10.0


For the purpose of this lab could I simply reconfigure the 17.16.10.0/24 network to be a /16 on Lab_A and ISP?

[Scottmeup]

I'm still having a hard time with this one! I've got a lab based on 13.1 where i've replaced the serial links with copper, and replaced the 171.16.10.0/24 with a 171.16.10.0/16.
After setting up RIP but before running the passive-interface and default-network commands I can ping from Lab_C to ISP and back again.
After I run the passive-interface and ip default-network commands I can no longer ping from Lab_C or Lab_B to ISP.

I'd be happy to post topology / config files! Can anyone help?

[bobdempsey]

Sure. Post'em!

__________________________________________________ ___________
CCNA

[Scottmeup]

Here you go ;) thanks for the interest! All passwords are cisco.

I've modified the lab 13.1 in the book: changed the 171.16.10.0/24 to 171.16.10.0/16, changed the serial links to copper crossovers and ran default-information originate on Lab_A because RIP wasn't distributing 0.0.0.0 without it! I still can't ping ISP from Lab_B and Lab_C though :confused:


!
version 12.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname ISP
!
!
!
enable secret 5 $1$mERr$hx5rVt7rPNoS4wqbXKX7m0
enable password cisco
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 171.16.10.1 255.255.0.0
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
shutdown
!
interface Vlan1
no ip address
shutdown
!
router rip
network 171.16.0.0
!
ip classless
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
logging synchronous
line vty 0 4
password cisco
login
line vty 5 15
password cisco
login
!
!
!
end



!
version 12.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Lab_A
!
!
!
enable secret 5 $1$mERr$hx5rVt7rPNoS4wqbXKX7m0
enable password cisco
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 171.16.10.2 255.255.0.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.20.1 255.255.255.0
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
router rip
passive-interface FastEthernet0/0
network 171.16.0.0
network 192.168.20.0
default-information originate
!
ip classless
ip route 0.0.0.0 0.0.0.0 FastEthernet0/0
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
logging synchronous
line vty 0 4
password cisco
login
line vty 5 15
password cisco
login
!
!
!
end



!
version 12.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Lab_B
!
!
!
enable secret 5 $1$mERr$hx5rVt7rPNoS4wqbXKX7m0
enable password cisco
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 192.168.20.2 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.30.1 255.255.255.0
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
router rip
network 192.168.20.0
network 192.168.30.0
!
ip classless
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
logging synchronous
line vty 0 4
password cisco
login
line vty 5 15
password cisco
login
!
!
!
end



!
version 12.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Lab_C
!
!
!
enable secret 5 $1$mERr$hx5rVt7rPNoS4wqbXKX7m0
enable password cisco
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 192.168.30.2 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
shutdown
!
interface Vlan1
no ip address
shutdown
!
router rip
network 192.168.30.0
!
ip classless
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
logging synchronous
line vty 0 4
password cisco
login
line vty 5 15
password cisco
login
!
!
!
end

[bobdempsey]

On Lab A try

ip route 0.0.0.0 0.0.0.0 171.16.10.1

__________________________________________________ _________________
CCNA

[Scottmeup]

Thank you for the reply! I've removed all static routes from Lab_A and added the line ip route 0.0.0.0 0.0.0.0 171.16.10.1. The output from Lab_B is:

Gateway of last resort is 192.168.20.1 to network 0.0.0.0

R 171.16.0.0/16 [120/1] via 192.168.20.1, 00:00:16, FastEthernet0/0
C 192.168.20.0/24 is directly connected, FastEthernet0/0
C 192.168.30.0/24 is directly connected, FastEthernet0/1
R* 0.0.0.0/0 [120/1] via 192.168.20.1, 00:00:16, FastEthernet0/0
Lab_B#ping 171.16.10.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 171.16.10.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

Lab_B#

Lab_A can still ping 171.16.10.1! I'm confused :confused:

I've done a tracerout from Lab_C and everything hits the 192.168.30.0 network, then the 192.168.20.0 network but gives up there and just times out!
I could ping 171.16.10.1 until I ran the passive interface s0/0 command.

[bobdempsey]

Your ISP router does not know what to do with packets destined for network 192.168.20.0/24 because you made the outbound interface from Lab A passive.

You have a number of options to fix this:

1. Add a static route on ISP to 192.168.20.0/24 via Lab A
2. Advertise routes from Lab A to ISP
3. Enable NAT on Lab A

You should do each to make sure you understand what's going on.

__________________________________________________ ___________________
CCNA

[Scottmeup]

D'oh! I realised that ISP wouldn't know how to ping going from ISP to Lab_B and Lab_C and back again. I don't know why I thought this way but I thought that the packets from Lab_B and Lab_C would give enough information to ISP to at least reach the next hop on the return path and from there...
Anyway, thanks for the reply! I'll give it a shot with your suggestions. Much appreciated!

[aneksadh]

rip does not allow classless routing
it allows only classful routing, right ? so it will allow us to ping between networks with default subnet masks

so the /24 of 171.16.10.1 s/b changed to /16 isn't it ?

am i correct ?
gosh there is so much to remember, its been an avalanche after chapter 6

rgds
anek

[ddavis0218]

rip does not allow classless routing
it allows only classful routing, right ? so it will allow us to ping between networks with default subnet masks

so the /24 of 171.16.10.1 s/b changed to /16 isn't it ?

am i correct ?
gosh there is so much to remember, its been an avalanche after chapter 6

rgds
anek

Look at the differences between version 1 and version 2 of RIP; you will find your answer there.