Hi folks!! Sorry, I have been away for some time. Let me share with you my problem and my ‘thinkable’ solutions. Am trying to nail a networking job and interviews have not been forthcoming.

MY THINKABLE SOLUTION! Am getting myself involved in a little Microsoft Server and Linux stuffs. Hopefully that would get me the job.

Let’s get to business. I would be using gns3 for my simulation which is available online. I also would be using vpcs to do my clients’ ping.

STATIC ROUTING

I have already created some configurations which I call default. This is what I do so I can easily rush back to my topology anytime I need to get going. So my advice is perform some basic configurations and save it to your start-up configs.IT DEFINETLY MAKES YOUR WORK EASIER.

Default {Hostnames, IP addresses}
The loopback addresses are 1.1.1.1, 2.2.2.2 and 3.3.3.3 for R1, R2 and R3 respectively. This would be acting like connected interfaces to the routers.

TASK:

Ø  Configure static routing in the topology so the routers can ping each other. Use ip route *network* *ip add* method for R1 and R2. Use ip route *network* *int* for R3

Ø  Remove the static route in R3 and use a default route instead

SYNTAX IS

#ip route ‘THE NETWORK I WANT TO REACH’ ‘THE SUBNET MASK OF THE NETWORK I WOULD LIKE TO REACH’ ‘MY NEXT HOP ADDRESS i.e. THE ADDRESS OF MY NEIGHBOUR THAT ALLOWS ME REACH THIS NETWORK’                            OR

#ip route ‘THE NETWORK I WANT TO REACH’ ‘THE SUBNET MASK OF THE NETWORK I WOULD LIKE TO REACH’ ‘INT OF MY ROUTER THAT ALLOWS ME TO REACH THIS ADDRESS’

R1(config)#ip route 10.10.10.0 255.255.255.0 192.168.10.2
R1(config)#ip route 2.2.2.2 255.255.255.255 192.168.10.2
R1(config)#ip route 3.3.3.3 255.255.255.255 192.168.10.2

When we configured static route to 10.10.10.0 network only, we could ping 10.10.10.2 network successfully since r2 can reach the interface it was sent from i.e. 192.168.10.1

..but if we ping 10.10.10.1 it won’t be succesful since r3 can’t reach the ip of the sending ping (192.168.10.1).Also note that if we do  #ping 10.10.10.2 source lo 0.The ping would be unsuccessful since r2 can’t reach the source of the PING

R2(config)#ip route 1.1.1.1 255.255.255.255 192.168.10.1
R2(config)#ip route 3.3.3.3 255.255.255.255 10.10.10.1

R3(config)#ip route 2.2.2.2 255.255.255.255 s0/0
R3(config)#ip route 192.168.10.0 255.255.255.0 s0/0
R3(config)#ip route 1.1.1.1 255.255.255.255 s0/0

Results: A show ip route would display the results of our connected network. I would only display that of R1..Also run pings from all the Routers..e.g R1#ping 3.3.3.3

R1#sh ip route

Gateway of last resort is not set

    1.0.0.0/32 is subnetted, 1 subnets
C       1.1.1.1 is directly connected, Loopback0

     2.0.0.0/32 is subnetted, 1 subnets
S       2.2.2.2 [1/0] via 192.168.10.2

     3.0.0.0/32 is subnetted, 1 subnets
S       3.3.3.3 [1/0] via 192.168.10.2

C    192.168.10.0/24 is directly connected, FastEthernet0/1

     10.0.0.0/24 is subnetted, 1 subnets
S       10.10.10.0 [1/0] via 192.168.10.2….FIGURE OUT WHAT EACH LINE MEANS!!! 10.10.10.0 is the network, 1 is the Default Administrative Distance of Static Routing (AD).192.168.10.2 is the next hop to reach 10.10.10.0  network.

NOTES

1.      CMD ON R1 #ip route 10.10.10.0 255.255.255.0 192.168.10.2

OUTPUT GENERATED WITH  #sh ip route

10.0.0.0/24 is subnetted, 1 subnets

S       10.10.10.0 [1/0] via 192.168.10.2

2.      CMD ON R3 #ip route 192.168.10.0 255.255.255.0 s0/0

OUTPUT GENERATED WITH #sh ip route

S    192.168.10.0/24 is directly connected, Serial0/0

10.0.0.0/24 is subnetted, 1 subnets

C       10.10.10.0 is directly connected, Serial0/0

Compare the two. One is static and one is directly connected. What separates them is just the C and S...I LOVE CISCO

PROBLEM 2

R3(config)#no ip route 2.2.2.2 255.255.255.255 s0/0
R3(config)#no ip route 192.168.10.0 255.255.255.0 s0/0
R3(config)#no ip route 1.1.1.1 255.255.255.255 s0/0
R3(config)#ip route 0.0.0.0 0.0.0.0 s0/0…………….MEANING I WILL FORWARD ANY NETWORK ADDRESS I DON’T KNOW VIA MY s0/0 INTERFACE

R3#sh ip route

Gateway of last resort is 0.0.0.0 to network 0.0.0.0…………DID U SEE THAT

3.0.0.0/32 is subnetted, 1 subnets
C       3.3.3.3 is directly connected, Loopback0

10.0.0.0/24 is subnetted, 1 subnets
C       10.10.10.0 is directly connected, Serial0/0

S*   0.0.0.0/0 is directly connected, Serial0/0………………….NOW YOU SEE THAT

RUN A PING FROM ALL THE ROUTERS AND CHECK THEIR SUCCESS RATE

NOW AM GOING TO MAKE YOU SNEEZE A LITTLE!!!ASSUMING WE HAVENT CFGED (my shortcut to configured) STATIC ROUTING AT ALL

Ø  WITHOUT ROUTING,IF R1 LO 0 PINGS 10.10.10.2 (#ping 10.10.10.2 source lo 0),IT WILLL FAIL SINCE R1 DOES NOT HAVE A ROUTE FOR IT IN ITS ROUTING TABLE

Ø  BUT IF WE CFG A DEFAULT ROUTE VIA ITS F0/1 INT, THE PING WLD SUCCED SINCE R1 WLD B SENDING IT VIA ITS FAST ETHENET ADD AND NOT ITS LOOPBACK.

Ø  IF WE DO A PING WITH SOURCE LO 0, D PING WLD FAIL.NOT THAT IT WONT GET TO R2, BUT R2 WOULDN’T KNOW WAT TO DO WITH IT

!!!!I  HOPE I HAVE SCORED A LITTLE POINT..ITS GONNA BE FUN ALL THROUGH.AND PRAY I GET A JOB FAST THOUGH…..!!!AM OUT!!!

About Myself

About myself: My name is Kehinde Olugotun. I am XX years old (chuckles..you don't wanna know I am an old man). I currently reside in Lagos Nigeria.
I resigned some weeks ago as an AutoCad Technician so I could focus all my energy into getting into the networking experience.As at the time of this posting, I currently have the CCNA (Cisco Certified Network Associate), CCNP (Cisco Certified Network Professional) and CCIP (Cisco Certified Internetwork Professional) . Too bad I don't have a job yet with all these cert.PRAY FOR ME THOUGH
I got myself into the networking in 2008 during my Student Internship and its being fun since then.
I would be sharing my networking knowledge with guys who cant afford to go to training institutes but can afford to get a laptop. I am passionate about this and am willing to share everything I have got.
Join me as we explore this world together.
You can always email me at kennidiamond@gmail.com
Thanks