Network Problems

jrmcent

Hey I am setting up my network following the lab on here. Having some problems though.

This is my ip route for RouterA
192.168.22.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.22.6/32 is directly connected, Serial0
C 192.168.22.0/24 is directly connected, Serial0
R 192.168.33.0/24 [120/1] via 192.168.22.6, 00:00:22, Serial0
RouterA# 192.168.22.0/24 is variably subnetted, 2 subnets, 2 masks

This is my ip route for RouterB
192.168.22.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.22.5/32 is directly connected, Serial0
C 192.168.22.0/24 is directly connected, Serial0
C 192.168.33.0/24 is directly connected, Ethernet0

As you can see, RouterA is not picking up 192.168.11.1 (my host through e0).

This is my show ip protocol on Router A:
Ethernet0 is up, line protocol is down
Hardware is Lance, address is 00e0.1ea9.7e2b (bia 00e0.1ea9.7e2b)
Description: Connected to LAN1
Internet address is 192.169.11.1/24

I know the line protocol is down, but every time I try to turn it on, nothing happens. I am using the no shutdown command, and usually something will pop up saying that the line protocol is up, like on RouterB, but nothing comes up. Any reason for this? I am using a different type on ethernet cable than the one that is used to connect RouterB to the host, could that be causing this? I am not sure how to check to see if it is a twisted pair cable, and the only reason I am not using the one that came with the kit is because it wont reach my computer. All other protocols are up, just ethernet 0 is down.

jrmcent

Also, I am using 3com transceivers, when I connect the Ethernet on RouterB to the host (an ibook), I have 2 lights light up, Link and Polarity OK, and the other 2 are blinking. When I connect the ethernet on RouterA to my other host (pc) Only the Polarity OK light lights up, none blinking. I did this using the wire that came with the kit, just moved around my routers. Is this something with my NIC?

markzab

I was attempting to help you out so i started drawing out your network diagram on paper. I got to the serial links where I had to stop. On router A you have what I'd imagine your s0/0 IP to be 192.168.22.6 /32. Then on router B I'd imagine you have the s0/0 IP set to 192.168.22.5 /32. You're obviously using VLSM in order to save IP's on the net and using a block of 4 for the serial links. If I'm not mistaken to do that you'd need to have a /30, not /32.

Could that be causing the problem? Try to change the mask on those 2 IP's to 255.255.255.252 or /30. If that helps solve the issue let me know. If not I'll move further into the diagram to see what else might come up.

And of course, given my rookie status, if anyone with more experience see's that I am wrong please jump in.

jrmcent

hey thats a good point, im running to get something to eat right now so ill try it when I get back and let you know, thanks for the help.

mikej412

Cabling should be covered as part of the INTRO material.

Straight-thru Ethernet Cable between Router and Switch
Straight-thru Ethernet Cable between PC and Switch
Cross-over Ethernet Cable between PC and PC
Cross-over Ethernet Cable between Router and PC
Cross-over Ethernet Cable between Router and Router
Cross-over Ethernet Cable between Switch and Switch (unless you have one of the new switches)

Check out this Network+ thread
http://www.techexams.net/forums/viewtopic.php?t=21894

If you're not using a switch anywhere, swap the Ethernet cables and see if the problem follows the cable.

Kaminsky

^^^^^^^^^^^^^^^^^
| | | | | | | | | | | | | | | | |


Sticky!

jrmcent

yeah its not the cables, i switched them every witch way and the only time the two lights go on is when its in the ibook.

jrmcent

ooo i think I know whats wrong, when I installed vista my IEEE Controller never installed right and I dont have any of the drivers, so im guessing that might be it

markzab

Wait, lemme see if I have this down right...

---

This is my ip route for RouterA
192.168.22.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.22.6/32 is directly connected, Serial0
C 192.168.22.0/24 is directly connected, Serial0
R 192.168.33.0/24 [120/1] via 192.168.22.6, 00:00:22, Serial0
RouterA# 192.168.22.0/24 is variably subnetted, 2 subnets, 2 masks

---

So your network is 192.168.22.0 /24

WAN link:
Router A's s0/0 IP is 192.168.22.5 /30
Router B's s0/0 IP is 192.168.22.6 /30

Router B's e0/0 is 192.168.33.0 /24 (LAN on Router

---

Ok, I'm seeing the possibility of a couple things wrong here...First I'm guessing that the host is connected to router B since it is the only router that has the e0/0 interface configured. There might be a problem if that is the case because you don't have the host on the same subnet as that interface. You have your host set to 11.1 yet the ethernet interface it is connected to is in the 33.0 subnet.

If you have the host connected to router A via ethernet then the problem may be that you don't even have e0/0 configured on router A.

And finally, the other thing I noticed...

You wrote:

As you can see, RouterA is not picking up 192.168.11.1 (my host through e0).

But then looking at show ip protocol on Router A gives us...

Ethernet0 is up, line protocol is down
Hardware is Lance, address is 00e0.1ea9.7e2b (bia 00e0.1ea9.7e2b)
Description: Connected to LAN1
Internet address is 192.169.11.1/24

Are you sure you've got your IP's set correctly everywhere?

Again, I'm not certain of my answers but just trying to help.

jrmcent

ooo very good catch, I didnt even notice that!! Thank you so much, I obviously made a typo with the 168!

markzab

jrmcent wrote:

ooo very good catch, I didnt even notice that!! Thank you so much, I obviously made a typo with the 168!

There's more I'm not getting though.

Is the 11.1 host connected to router B or router A?

jrmcent

11.1 is connected to RouterA, 33.1 is connected to RouterB

markzab

jrmcent wrote:

11.1 is connected to RouterA, 33.1 is connected to RouterB

Ok, well then if you have 11.1 (host) connected to Router A through the ethernet interface then you need to configure that interface. Configure your ethernet interface on Router A with the IP address you have currently on the host. 192.168.11.1 /24. Then reconfigure the host to have IP address 192.168.11.2 /24.

I'm saying to switch that IP to the interface because you usually have the first valid host IP (11.1) set as the default gateway for that subnet.

Unless there is something else wrong at that point you should be able to see your host from Router A.

markzab

Also, once you've done that...

Notice when you show ip route on Router A, this line comes up...

R 192.168.33.0/24 [120/1] via 192.168.22.6, 00:00:22, Serial0

That's because Router A can see the LAN you've created on Router B's ethernet interface. It can see the 33.0 subnet via the WAN interface (s0/0) on Router B. It basically knows how to get there.

Did you notice that Router B's show ip route output didn't have a line like this?

Once you've configured the ethernet interface on router A with what I said above, you should have a similar line on Router B at that point. It should look something like this:

R 192.168.11.0/24 [120/1] via 192.168.22.5, 00:00:22, Serial0

Man, I hope I'm right with all this.

markzab

I've been sitting here waiting to see what's happened...

Can't...leave...hanging...

Must...fix...problem...

Error...Error...Error...

Shutdown...enabled...

(yeah, I know...I need to get out more)

jrmcent

hey so i got everything done, here are some outputs...

RouterA ip route:
C 192.168.11.0/24 is directly connected, Ethernet0
192.168.22.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.22.6/32 is directly connected, Serial0
C 192.168.22.0/24 is directly connected, Serial0
R 192.168.33.0/24 [120/1] via 192.168.22.6, 00:00:12, Serial0

RouterB ip route:
R 192.168.11.0/24 [120/1] via 192.168.22.5, 00:00:02, Serial0
192.168.22.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.22.5/32 is directly connected, Serial0
C 192.168.22.0/24 is directly connected, Serial0
C 192.168.33.0/24 is directly connected, Ethernet0

So seems like it is seeing everything. Now I have a question....where are the hosts given their ip addresses? All I inputed was the interface ip addresses, RouterA e0 was 192.168.11.1 and RouterB was 192.168.33.1. Are the hosts given their ip's automaticall based on the mask? Is there a command to show the ip of connected hosts?

markzab

jrmcent wrote:

hey so i got everything done, here are some outputs...

RouterA ip route:
C 192.168.11.0/24 is directly connected, Ethernet0
192.168.22.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.22.6/32 is directly connected, Serial0
C 192.168.22.0/24 is directly connected, Serial0
R 192.168.33.0/24 [120/1] via 192.168.22.6, 00:00:12, Serial0

RouterB ip route:
R 192.168.11.0/24 [120/1] via 192.168.22.5, 00:00:02, Serial0
192.168.22.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.22.5/32 is directly connected, Serial0
C 192.168.22.0/24 is directly connected, Serial0
C 192.168.33.0/24 is directly connected, Ethernet0

So seems like it is seeing everything. Now I have a question....where are the hosts given their ip addresses? All I inputed was the interface ip addresses, RouterA e0 was 192.168.11.1 and RouterB was 192.168.33.1. Are the hosts given their ip's automaticall based on the mask? Is there a command to show the ip of connected hosts?

Haven't you gotten to subnetting yet in your studies? Also, you still have the subnet for your WAN links set to /32 (255.255.255.255). You have to change it to /30 (255.255.255.252). I'm not sure exactly what you're asking but you set the IP on your hosts manually unless of course you've got DHCP running, but that's a whole different subject. Did you set your host on the 11.0 subnet (your ibook) to 192.168.11.2? If so you should be able to ping the router's interfaces. That's a way for you to test everything out.

First try to ping the ethernet interface of router B, 192.168.33.0 (If you have a host connected to that interface try to ping it instead). If that works then you're routing nicely.

If for some reason you cant ping it work your way to it to find where the problem is. Ping router A's serial, then router B's serial, then router B's ethernet, etc, etc, etc.

jrmcent

yeah i can ping all my interfaces, and I am up to chapter 5 in sybex. I was using the tech lab on this site as an outline. This is how the network is set up, I have 1 network LAN1-192.168.11.0/24 between routerA and hostA, then I have another network WAN 192.168.22.0/24 between routerA and routerB, then I have the third network LAN2 192.168.33.0/24 between routerB and hostB. Why would I want to change the WAN to /30 if I only need the one network? And I have no idea why the /32 is show up like that, but I thought maybe it had to do with something I havent learned yet, but all interfaces are set up with /24.

Now as far as my question on the hosts, when you go through the setting up of the ip addresses this is what I follow:

RouterA:
interface ethernet 0
description xxxxx
ip address 192.168.11.1 255.255.255.0
no shutdown

interface serial 0
description xxxxxx
ip address 192.168.22.5 255.255.255.0
encapsulation ppp
no shutdown

router rip
version 2
network 192.168.11.0
network 192.168.22.0

RouterB:
interface ethernet 0
description xxxxx
ip address 192.168.33.1 255.255.255.0
no shutdown

interface serial 0
description xxxxxx
ip address 192.168.22.6 255.255.255.0
clock rate 64000
encapsulation ppp
no shutdown

router rip
version 2
network 192.168.33.0
network 192.168.22.0

After doing that I am able to ping 192.168.33.1 from RouterA. But 192.168.33.1 is the interface, where do I set the host?

markzab

jrmcent wrote:

yeah i can ping all my interfaces, and I am up to chapter 5 in sybex. I was using the tech lab on this site as an outline. This is how the network is set up, I have 1 network LAN1-192.168.11.0/32 between routerA and hostA, then I have another network WAN 192.168.22.0/32 between routerA and routerB, then I have the third network LAN2 192.168.33.0/32 between routerB and hostB. Why would I want to change the WAN to /30 if I only need the one network?

Now as far as my question on the hosts, when you go through the setting up of the ip addresses this is what I follow:

RouterA:
interface ethernet 0
description xxxxx
ip address 192.168.11.1 255.255.255.0
no shutdown

interface serial 0
description xxxxxx
ip address 192.168.22.5 255.255.255.0
encapsulation ppp
no shutdown

router rip
version 2
network 192.168.11.0
network 192.168.22.0

RouterB:
interface ethernet 0
description xxxxx
ip address 192.168.33.1 255.255.255.0
no shutdown

interface serial 0
description xxxxxx
ip address 192.168.22.6 255.255.255.0
clock rate 64000
encapsulation ppp
no shutdown

router rip
version 2
network 192.168.33.0
network 192.168.22.0

After doing that I am able to ping 192.168.33.1 from RouterA. But 192.168.33.1 is the interface, where do I set the host?

I just don't think we're on the same page here. I'm not understanding why you're saying your networks have a /32 when in the config your masks are all 255.255.255.0, which would be /24.

I'm saying on the WAN links that you should use a /30 because if you're using a mask of 255.255.255.0, then on your network of 192.168.22.0 you are wasting a LOT of valid IP addresses. With a mask of 255.255.255.0 you have a subnet with 254 available host ID's. You are only using 2 of them for that subnet (each serial interface). You just wasted 252 available addresses in that subnet. Using VLSM will save all of them by making a mask on that network of /30 or 255.255.255.252. With that mask you only have 2 valid addresses to use and you use them on each side of that WAN link.

On the other part of your question, where do you set the host. I think you might be a little confused. A host would be something like a computer or notebook or something like that. Do you literally have a PC connected to e0/0 on router B? If not then you really can't "set a host" because there is none. It's a different story on router A because you literally have your ibook connected to e0/0 on that subnet. In that case you set the e0/0 to 11.1 (like you did) and then you'd set the host connected to it (in this case your ibook) to have an IP address of 11.2, which would place it on the same subnet.

Back to the first part regarding the masks. Please don't take this the wrong way, but I think you should go back in the book and ready over the subnetting and especially VLSM section again. I won't BS you, I'm only up to chapter 4 of the same book but I think you might have blown through chapters 2 and 3 a bit fast. It is ESSENTIAL that you have those down solid before moving on.

Again, not trying to sound like an ass or anything like that, just trying to help out bud.

markzab

On a side note...

This thread has been a hell of a tune-up for me. When I decided to start studying again I wasn't sure if I was going to just make this a hobby and continue in the Mortgage industry I'm in now or try to go back full steam into the networking field. This thread reminded me what I loved most about my old career. Troubleshooting. Digging to find the problem. The rush/satisfaction you get when you find the solution.

Thank you.

markzab

J, I just went to start studying and realised I am also on chapter 5 (not 4) and oddly enough I'm reading over pages 231 and 232 and I'm thinking why is this familiar. His lab set-up is almost identical to what you're doing. 192.168.20.0 subnet between router A and router B with the same mask I said you shouldnt use, 255.255.255.0.

Now, let me just clarify that using the 255.0 mask for the WAN links isn't "wrong", but I'm surprised Todd, after preaching VLSM's and the fact that you shouldn't waste IP's is doing just that in his own example.

Bottom line...practice doesn't make perfect...perfect practise makes perfect.

Shame on you Todd.

mikej412

markzab wrote:

Shame on you Todd.

If you haven't hit CIDR yet, Todd is just being nice -- but don't worry, it won't last.

markzab

mikej412 wrote:

markzab wrote:

Shame on you Todd.

If you haven't hit CIDR yet, Todd is just being nice -- but don't worry, it won't last.

Bring it!

jrmcent

markzab, thanks for all the replies. Yeah I think I am going to start the book over now, since I have got at least a little hands on experience, I feel like I am missing a lot that might get filled in now. Thanks again for taking the time to help me, and I really appreciate it.

markzab

No problem J.

It was fun.