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GNS3 Lab & Exercise: VPN troubleshooting Lab Scenario

Written by irom from http:// on November 9th, 2011 | 23 Comments

Scenario: A simple IPsec tunnel between fast Ethernet interfaces of routers SW1 (f1/1) and R1(f0/0). But it doesn’t work..

SW1#ping 10.0.0.2 source 10.0.10.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.0.2, timeout is 2 seconds:
Packet sent with a source address of 10.0.10.1
…..
Success rate is 0 percent (0/5)

R1#ping 10.0.10.1 source 10.0.0.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.10.1, timeout is 2 seconds:
Packet sent with a source address of 10.0.0.2
…..
Success rate is 0 percent (0/5)

Find out why without looking into initial configuration files, all IOS commands are allowed.

Routers Used: Cisco C3745
IOS: (C3745-ADVENTERPRISEK9-M), Version 12.4(23)
Feature of Topology: VPN, IPSEC, ISAKMP,RIP
Download GNS3 files: http://www.uploadhookup.com/index.php/files/get/YA4jjABr6Z/vpn-troubleshooting.rar

Solution:

Looking into initial configuration file will help !

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GNS3 Lab Exercise: Load Sharing Lab Scenario

Written by irom from http:// on November 9th, 2011 | 5 Comments

Scenario: R0 is connected to R1, R2 and R3 through DS3 (or OC3). Additionally R1, R2 And R3 are connected by Metro-Ethernet (simulated by SW1). All interfaces are in EIGRP 1. In case DS3 R0-R1 is broken traffic from R0 (source 100.100.100.100) to R1 (destination 1.1.1.1) should be shared between remaining two DS3s:

1) 1:1, traffic equally distributed between R0-R2 and R0-R3

2) 1:2, twice as much traffic on R0-R2 as on R0-R3

Traffic distribution has to be proven by test with ICMP traffic

Routers Used: Cisco 3640

IOS: c3640-ik9o3s-mz.124-25b, (C3640-IK9O3S-M), Version 12.4(25)

Feature of Topology: EIGRP Metric Weights, EIGRP unequal cost load balancing

Download GNS3 files: http://www.uploadhookup.com/index.php/files/get/luHPhnCS40/load-sharing.zip plus setup vlan 100 as shown below:

SW1#vlan database
SW1(vlan)#vlan 100
VLAN 100 added:
Name: VLAN0100
SW1(vlan)#apply
APPLY completed.
SW1(vlan)#exit
APPLY completed.

Solution:

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GNS3 Lab & Exercise: OSPF Case Study & Lab Scenario 3

Written by LBSources from http://www.gns3-labs.com on August 13th, 2010 | 27 Comments

How are we doing? So! As for me, I’ve beat the deadline for my CCNA expiration as well as the BSCI deadline! Wohoo! Very happy to say the least. Right now I’m working on SWITCH and hope to have this completed by the end of September..

There is a new site online that took the idea of this site (though they say they didn’t know this site existed) and is doing it 100 times better. If I could redo what I started here, I’d definitely do it a little differently today. But hey, at the time I was the only site. Anyway – the new GNS3 lab site dedicated and full of GNS3 labs is called GNS3-Vault and you can check it out at http://www.gns3vault.com .. Go check it out – they are doing a far better job with current labs than I can.

As for me, I’m studying very hard with the SWITCH studies and a new technical/study/personal blog at http://echoreplypackets.net. I’m sure I’ll be even more busy when I hit TSHOOT. I’m not saying I’m taking the site down or stopping labs, but this will end up becoming the site where I upload labs that I’ve used my own as well as labs that you guys contribute more than a lab supplying site.

GNS3 Vault is a great site! Go over and support it! Plenty of good labs.

Now onto the lab!

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Petition Cisco for Educational IOS License!

Written by LBSources from http://www.gns3-labs.com on July 7th, 2010 | 13 Comments

So here is something that can very well take some time to come around the corner, but be here just like that and impact all of us. The new Cisco IOS (15.0) licensing methods are potentially putting our educational ability to study using GNS3/Dynamips at risk of coming to an end.

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GNS3 Lab & Exercise: GNS3-Labs – BGP & EIGRP Case Study 4

Written by LBSources from http://www.gns3-labs.com on July 6th, 2010 | 25 Comments

Hello All! Hope your weekend and holiday has been a great one!

Here is another one of the final Cisco Network Academy labs. This one involves BGP and EIGRP. A lot of good tasks in this case scenario. I wish that they would have had many more lab scenarios since they are exactly whats on the lab. There definitely needs to be a new lab book developed – Maybe I’ll create one? ;) Kidding!

Anyway … Onto the lab!

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GNS3 Lab & Exercise: EIGRP & OSPF Route Manipulation

Written by LBSources from http://www.gns3-labs.com on June 26th, 2010 | 7 Comments

So here is another lab I put together based on some studies and reading recently. I basically put together the scenario, so if it’s lacking conveying the scenario in a professional manner, I apologize :)

This is basically a simple route redistribution and route manipulation lab. Simple, but requires a few steps that will test your ability to adapt to an already deployed network while implementing a new routing protocol.

Hope you enjoy! :)

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Packet Pushers Podcasts – Listen In!!!

Written by LBSources from http://www.gns3-labs.com on June 22nd, 2010 | 5 Comments

Ok – So if you’re not up yet on the Packet Pushers, you’re totally missing out on some good network discussion (usually) hosted by @Etherealmind, @ECBanks@Danhughes1234ie. The greatness about this podcast is it’s like sitting around and chatting it up with guys in your office or at a tech conference or on a project with other project team members – Thats how I see it at least :)

There is no other agenda to these podcasts except talking about the topics. There is no vendor target, no advertisements, no bias – though we are all Cisco minded :) They cover subjects such as DDoS, IOS Licensing concerns, Dynamips, MPLS basics, Technical interview tips, datacenter switching and the list goes on!

Overall it’s a great show to listen to and best of all, you may know all the guests on the show from Twitter. So it feels even more realistic since you may have tweeted with these folks for some time now.

I enjoy the show very much and I enjoy the guests even more! I recommend you check out the Packet Pushers Podcasts! :) Trust me, you will love it!

Cheers guys!

Packet Pushers Podcasts – Listen In!!!

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Using Microcore Linux in GNS3 To Simulate PC/Workstations/Computers

Written by LBSources from http://www.gns3-labs.com on June 20th, 2010 | 15 Comments

So, you read in the latest release notes of GNS3 0.7.2 the ability to simulate PCs/Hosts/Workstation/Computers, etc and you dont know where to begin? Well, fellow Moderator of the GNS3 forums Kage, put together a very simple, clear and step by step document to getting started.

Using Microcore Linux in GNS3 To Simulate PC/Workstations/Computers

Thanks Kage!

Any assistance you need RE the use of Microcore should be directed to the GNS3 forums, NOT here :) I’m no expert..

If you have a hard time getting Microcore working – you can always try vpcs – Documentation can be found here -> How to simulate PC/Workstations/Hosts/Computers using vpcs

Cheers!

LB

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GNS3 Lab & Exercise: OSPF Case Study & Lab Scenario 2

Written by LBSources from http://www.gns3-labs.com on June 19th, 2010 | 3 Comments

How are we doing? I’m continuing on working to complete this lab book and all the labs :)

This is another OSPF related lab from the Cisco Networking Academy Lab Portfolio. No EIGRP or other protocols involved. This lab involves the use of sub-interfaces, which changes your frame-relay statements – watch out and don’t get too confused :)

I perform all of these labs on my own using my own knowledge and experience (warning and disclaimer). They may very well be implemented differently than a method you might choose. So long as it meets the requirements and works, essentially it’s acceptable (In my feeble opinion). But if you notice a terribly or complicated method used by me to achieve the goals and you feel yours is much easier, makes sense or is the standard; please do share – I’m always open to learning :)

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