Trouble routing fast ethernet interfaces between Cisco 2811 and 1841

[rirest]

Hello Guys,

Having trouble routing fast ethernet interfaces between Cisco 2811 and Cisco 1841 routers? I think I checked everything, but may have missed something. This is my lab I'm doing for my class. Please help. Let me know what you need to see.

Thanks

[rirest]

Hi George,

Just changed both routers to duplex full and speed 100.

Both routers port lights came on, but protocol is still showing down.

Thanks

still hopefull.... I'm sure it's something simple.  

[rirest]

Hi,

So I just did the same configurations in Packet tracer and its the same thing, protocol is showing down on both, and I did use the crossover cable.

Is it possible its my configurations?

Thanks

[Georg Pauwen]

Hello,

post the Packet Tracer project (.pkt) file, zip it first, otherwise the system won't let you upload it...

[rirest]

Please help.

Here's the packet tracer that is exactly like my lab. I'm still having trouble with it.

I am also giving you my configs for the lab.

Please let me know if you see anything wrong. Going crazy with this..

Thank you

ISP
fa0/1= 100.100.100.1/30 (to R1)
fa0/0= 200.200.200.1/24 (to PC-A)
ip route 0.0.0.0 0.0.0.0 100.100.100.2

R1
Fa0/0= 100.100.100.2/30 (to ISP)
s0/0/1= 10.0.0.1/30 DCE (to R2)
ip route 200.200.200.0 255.255.255.0 100.100.100.1
ip route 192.168.10.64 255.255.255.192 10.0.0.2
ip route 192.168.10.192 255.255.255.192 10.0.0.2

R2
s0/0/1= 10.0.0.2/30 (to R1)
fa0/0= 192.168.10.193/26 (to PC-C)
fa0/1= 192.168.10.65/26 (to PC-B)
ip route 0.0.0.0 0.0.0.0 10.0.0.1

PC-A
200.200.200.200
255.255.255.0
200.200.200.1

PC-B
192.168.10.100
255.255.255.192
192.168.10.65

PC-C
192.168.10.200
255.255.255.192
192.168.10.193

[Georg Pauwen]

Hello,

the auto cabling connects the PC to the router with a cross cable. Seems to be a quirk of Packet Tracer, or maybe the 1841 works that way. Attached the revised project file.I also added a default route to the router on the left...

[rirest]

Hi George,

Thank you for all your help.

So I checked and every PC is able to ping each other on Packet tracer.

On my home lab, I just thought to add a switch in between the 1841 and PC, and now everything is up.

But now the Pc's cannot ping each other? I even tried changing the default to just the port number instead of the IP and still nothing. I know packet tracer is good, but are my ip routes ok?

thanks again.

[Georg Pauwen]

Hello,

you are talking about a lab using real routers now ? What is the configuration of the switch ports ?

[rirest]

Yeah, the packet tracer is working now. But now my routers at my house, the Pc's connected are not pinging each other.

Here's my configs I used, its the same thing I used for the packet tracer. How come packet tracer is not so picky.

ISP (1841)
fa0/0= 100.100.100.1/30 (to R1)
fa0/1= 200.200.200.1/24 (to PC-A)
ip route 0.0.0.0 0.0.0.0 100.100.100.2

R1 (2811)
Fa0/0= 100.100.100.2/30 (to ISP)
s0/0/1= 10.0.0.1/30 DCE(to R2)
ip route 200.200.200.0 255.255.255.0 100.100.100.1
ip route 192.168.10.64 255.255.255.192 10.0.0.2
ip route 192.168.10.192 255.255.255.192 10.0.0.2

R2 (2811)
s0/0/1= 10.0.0.2/30 (to R1)
fa0/0= 192.168.10.193/26 (to PC-C)
fa0/1= 192.168.10.65/26 (to PC-B)
ip route 0.0.0.0 0.0.0.0 10.0.0.1

PC-A
200.200.200.200
255.255.255.0
200.200.200.1

PC-B
192.168.10.100
255.255.255.192
192.168.10.65

PC-C
192.168.10.200
255.255.255.192
192.168.10.193

Anything you can suggest, I'll try. 

Thanks again for helping me. 

[luis_cordova]

Hi @rirest 

Just to rule out, have you tried disabling PC firewalls?
On occasion, they block ping responses.

Regards

[Georg Pauwen]

Hello,

if you are using the exact same configuration as in your Packet Tracer lab, your IP addresses appear to be on the wrong interfaces on the ISP and R1 router. Make sure the IP addresses and interfaces match as follows:

ISP (1841)
fa0/1= 100.100.100.1/30 (to R1)
fa0/0= 200.200.200.1/24 (to PC-A)
ip route 0.0.0.0 0.0.0.0 100.100.100.2

R1 (2811)
Fa0/1= 100.100.100.2/30 (to ISP)
s0/0/1= 10.0.0.1/30 DCE(to R2)
ip route 200.200.200.0 255.255.255.0 100.100.100.1
ip route 192.168.10.64 255.255.255.192 10.0.0.2
ip route 192.168.10.192 255.255.255.192 10.0.0.2

R2 (2811)
s0/0/1= 10.0.0.2/30 (to R1)
fa0/0= 192.168.10.193/26 (to PC-C)
fa0/1= 192.168.10.65/26 (to PC-B)
ip route 0.0.0.0 0.0.0.0 10.0.0.1

[rirest]

Hi,

So I fixed the that on the router, I switched the ip and port numbers last time to check the port and forgot to put it back. 

So my current status is Pc-a and Pc-b can ping each other but neither one can ping Pc-c.

I've checked all configs and it should work. But for some reason when i try and ping pc-a or b

from C I get 'Transmit failed. General failure." All PC's have a new rule to ping for the firewall. 

Thanks

Rich

[Georg Pauwen]

Hello,

I am pretty sure that there is something misconfigured with your PC-C. 'Transmit failed. General failure' typically means that you are using something else than TCP/IPv4. Check if your adapter has the right protocol selected, and not e.g. IPv6 by accident.

[Georg Pauwen]

Have a look at the file below...

[rirest]

Hi, so I still could not get this working, I think it had to be because of the 1841, but was wondering. 

In this same lab my teacher gave us an option of using ospf or eigrp. 

He said that on the 3 router setup, he told us that we can only configure routing between 2 of the routers.

If I just do that, wouldn't the 3rd router be unable to ping anything?

Thanks