CCNA class final project Need help

chappys4life

I am working on a final project in a CCNA class I am in at a local technical university and am stumped. The teacher wants us to have 3 routers connected to a switch through the fast ethernet ports and have a computer that can ping the routers which would all be in the same subnet. I have it now so it can ping but the issue is the routers that are connected below the 3 routers that are linked through serial connections. It can get to the first set of routers but when anything else it does not work. Any ideas? Right now the switch is a 2950 and all the ports are in vlan 1 and a ip has been set for the vlan but nothing else is configured on the switch.

JamesFigueroa

Can you please supply us with any routing protocols you are using

Also clarify the default gateway for the switch?

chappys4life

The routing protocol is ospf, on the switch I did not set a default gateway. All the computers under the 3 main routers can ping across the network even when they have to go through the switch.

The only one that is having issues pinging is the very top computer and it can ping the top three routers but nothing past that.

JamesFigueroa

I have not covered OSPF in real depth so far in my studies so excuse the ignorance

All the routers and the pc are on the same network so being able to ping the routers is not really saying anything. I think the issues lies in the gateway you have chosen(the switch) and the switch has no gateway to get out of the network. I could be totally wrong so I apologize if OSPF somehow rectifies that issue and Ill defer to someone more experienced.

chappys4life

JamesFigueroa wrote: »

All the routers and the pc are on the same network so being able to ping the routers is not really saying anything.

What I mean is pc1 can ping pc3 or pc6 and pc6 can ping pc 3 or pc1 with no issues.

Dont mind the orange lights I did not let the packet tracker come up all the way they do turn green.

JamesFigueroa

Can you do a tracert command from pc 1 to pc 0 to see where it is that its getting hung up?

chappys4life

From pc0 to pc1 it hits router6 the first interface then stops.

From pc0 to pc3 it hits the first interface on router 7 then stops
From pc0 to pc 5 it hits the first interface on router 8 then stops.

JamesFigueroa

hmm...that is weird. Any way you can upload the pt file?

TSaL

Lets see the Running config of router 6,7,8 please

chappys4life

Router 6
interface FastEthernet0/0
ip address 172.16.4.81 255.255.255.248
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
shutdown
!
interface Serial0/0
ip address 172.16.4.89 255.255.255.252
clock rate 64000
!
interface Serial0/1
ip address 172.16.4.93 255.255.255.252
clock rate 64000
!
router ospf 1
log-adjacency-changes
network 172.16.4.80 0.0.0.7 area 0
network 172.16.4.88 0.0.0.3 area 1
network 172.16.4.92 0.0.0.3 area 1

Router 7
interface FastEthernet0/0
ip address 172.16.4.82 255.255.255.248
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
shutdown
!
interface Serial0/0
ip address 172.16.4.97 255.255.255.252
clock rate 64000
!
interface Serial0/1
ip address 172.16.4.101 255.255.255.252
clock rate 64000
!
router ospf 1
log-adjacency-changes
network 172.16.4.80 0.0.0.7 area 0
network 172.16.4.96 0.0.0.3 area 2
network 172.16.4.100 0.0.0.3 area 2

Router 8
interface FastEthernet0/0
ip address 172.16.4.83 255.255.255.248
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
shutdown
!
interface Serial0/0
ip address 172.16.4.105 255.255.255.252
clock rate 64000
!
interface Serial0/1
ip address 172.16.4.109 255.255.255.252
clock rate 64000
!
router ospf 1
log-adjacency-changes
network 172.16.4.80 0.0.0.7 area 0
network 172.16.4.104 0.0.0.3 area 3
network 172.16.4.108 0.0.0.3 area 3

onesaint

chappys4life wrote: »

The routing protocol is ospf, on the switch I did not set a default gateway. All the computers under the 3 main routers can ping across the network even when they have to go through the switch.

The only one that is having issues pinging is the very top computer and it can ping the top three routers but nothing past that.

You have PC0's default gateway set to switch 6's IP (172.16.4.84), try changing that to one of the layer 3 devices in area 0.

chappys4life

onesaint wrote: »

You have PC0's default gateway set to switch 6's IP (172.16.4.84), try changing that to one of the layer 3 devices in area 0.

When I do that it can only stay in the router grouping. Example router 6 as gateway ip I can only ping pc1 or pc2

onesaint

chappys4life wrote: »

When I do that it can only stay in the router grouping. Example router 6 as gateway ip I can only ping pc1 or pc2

Can you post the output of
#sh ip route

from one of the routers you make the default gateway for PC0 (ex. R6)? Also the same from one of the routers in area 1 and area 2.

chappys4life

onesaint wrote: »

from one of the routers you make the default gateway for PC0 (ex. R6)? Also the same from one of the routers in area 1 and area 2.

Here is r6:

Gateway of last resort is not set

172.16.0.0/16 is variably subnetted, 13 subnets, 7 masks
O IA 172.16.0.0/23 [110/66] via 172.16.4.82, 00:01:50, FastEthernet0/0
O IA 172.16.2.0/24 [110/66] via 172.16.4.83, 00:01:50, FastEthernet0/0
O 172.16.3.0/25 [110/65] via 172.16.4.94, 00:02:25, Serial0/1
O IA 172.16.3.128/25 [110/66] via 172.16.4.83, 00:01:50, FastEthernet0/0
O 172.16.4.0/26 [110/65] via 172.16.4.90, 00:02:25, Serial0/0
O IA 172.16.4.64/28 [110/66] via 172.16.4.82, 00:01:50, FastEthernet0/0
C 172.16.4.80/29 is directly connected, FastEthernet0/0
C 172.16.4.88/30 is directly connected, Serial0/0
C 172.16.4.92/30 is directly connected, Serial0/1
O IA 172.16.4.96/30 [110/65] via 172.16.4.82, 00:01:50, FastEthernet0/0
O IA 172.16.4.100/30 [110/65] via 172.16.4.82, 00:01:50, FastEthernet0/0
O IA 172.16.4.104/30 [110/65] via 172.16.4.83, 00:01:50, FastEthernet0/0
O IA 172.16.4.108/30 [110/65] via 172.16.4.83, 00:01:50, FastEthernet0/0

instant000

Double check your addressing and network statements I attempted a similar lab just now, and it worked just fine.

chappys4life

instant000 wrote: »

Double check your addressing and network statements I attempted a similar lab just now, and it worked just fine.

How did you do yours? Did you use ospf and multiple areas and still keep the top 3 routers in the same subnet?

smashedpumpkins

I could be wrong, as I'm still studying for the CCNA myself, but I don't think you can make your host's default gateway a layer 2 switches IP. It needs to be a router where you can actually route. The reason you can ping router 6,7, and 8 is because they're on the same subnet. The switch uses arp requests and can find the correct router to ping. My guess is you still set the default gateway to 1 of the 3 routers. Simply have that router know the routes to the other two routers.

Interesting issue here. I would have to throw it together myself and find the issue.

chappys4life

I do think it is something with the switch. I did try giving the switch a default gateway of router 7 but then I could only get to Routers 2 & 3.

onesaint

chappys4life wrote: »

I do think it is something with the switch. I did try giving the switch a default gateway of router 7 but then I could only get to Routers 2 & 3.

I would go through your switch and ensure you've properly assigned vlan1 to the switch ports and a default route. If your dropping the switch vlan1 IP as the gateway for PC0, you're going to run into trouble. However, so long as your switch is properly configured (vlan IP set and ports set to vlan, default gateway set) then you should be good to go.

Setting PC0's gateway to should give you routes to the rest of the network via OSPF so long as the packets aren't getting dropped at the switch. If your running packet tracer, you might want to look at the simulation window to see where your packets are being dropped when running ping.

From Cisco:

Cisco IOS: Switch-A(config)#interface vlan 1

Switch-A(config-if)#ip address 172.16.1.2 255.255.255.0

Switch-A(config-if)#no shut

Switch-A(config)#interface fastEthernet 3/1

Switch-A(config-if)#switchport

Switch-A(config-if)#switchport access vlan 1

Now, set the default gateway of the switch. Other types of techniques may be used in setting default gateways and routing in general. The following example is one method:

Switch-A(config)#ip route 0.0.0.0 0.0.0.0 172.16.1.1

Verify the IP information on the switch by using show interface and show ip route commands in CatOS. Verify the ip information in Cisco IOS by using the show ip interface brief and show ip route commands.

Switch-A(config-if)#no shut

Except ip route didn't work when I tried it. So, instead, use:
(config)#ip default-gateway 172.16.4.81

Hope this helps.

instant000

chappys4life wrote: »

How did you do yours? Did you use ospf and multiple areas and still keep the top 3 routers in the same subnet?

1. I used single area OSPF, didn't notice yours was multiple area until later.
2. I just used a pass-through switch, didn't configure any VLANs

So, just to narrow down your issue, could you try setting the switch with no VLANs?

Also, if that host PC at the top is running Windows, it's different from the others.

That host PC probably is configured with a default gateway. If that default gateway has routes to everywhere else, then you should have no issue. It should be able to ARP all the local routers, which means your layer 2 is OK. (You did say it could ping all the routers on the near side of the serial.)

If it cannot reach any other networks, then you need to verify your routing.

Try extended pings from your routers, and source from the interface closest to the PC, then try to reach those distant IP's... this might bring you some clues.

If you posted your configs, it would help us.

Specifically, we're interested in interface configs, and ospf configs per each router.

...

Another thing, you could manually add the routes in Windows, to see if that helped you any.

pham0329

From Router 6, can you ping Router 0 and Router 1? Also, why is PC0 a /30 and Router 0 FA 0/0 a /26?

chappys4life

onesaint wrote: »

From
Except ip route didn't work when I tried it. So, instead, use:
(config)#ip default-gateway 172.16.4.81

Hope this helps.

Thank you Thank you Thank you. I entered the switchport acess vlan 1 and the set the gateway to router 7 and it works. I knew it was something in the switch I just could not figure out what. Also I did not enter a default gateway in the switch.

chappys4life

pham0329 wrote: »

From Router 6, can you ping Router 0 and Router 1? Also, why is PC0 a /30 and Router 0 FA 0/0 a /26?

The project required we use a VLSM scheme

onesaint

The project required we use a VLSM scheme

Pham0329's point was that on the diagram R0 and PC1 are /26 and /30 respectively. PC1 should be a /26 as well to be in the same subnet as its default gateway.

chappys4life wrote: »

Thank you Thank you Thank you. I entered the switchport acess vlan 1 and the set the gateway to router 7 and it works. I knew it was something in the switch I just could not figure out what. Also I did not enter a default gateway in the switch.

Cool! Thanks, it was fun to TS the issue. Hope you do well in the class.

chappys4life

onesaint wrote: »

Pham0329's point was that on the diagram R0 and PC1 are /26 and /30 respectively. PC1 should be a /26 as well to be in the same subnet as its default gateway.

Cool! Thanks, it was fun to TS the issue. Hope you do well in the class.

I just goofed but the actual ip is /26 just messed up when typing it on the diagram.

Thanks again for the help its all working and purring along. I know it will be a solid 100% project as I went way above what was required. Only had to do a single area but she would give extra credit for going over her requirements.

onesaint

chappys4life wrote: »

I just goofed but the actual ip is /26 just messed up when typing it on the diagram.

Thanks again for the help its all working and purring along. I know it will be a solid 100% project as I went way above what was required. Only had to do a single area but she would give extra credit for going over her requirements.

I figured it was a typo. I really like the Tshoot side of things sometimes. It's like solving a mystery.

You'r fortunate to have a good class like that. My experience with Network Academy through a local CC mearly followed the Net. Acad. requirements to the minimum specification. Now, I'm reading Odom, Lammle, and watching CBTs so that I get a real understanding. Makes me thing driven self study really takes the cake over structured class sometimes.

Let us know how the results turn out.