IOS Features & Management

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This category contains 7 posts

Troubleshooting: IP Addressing Tricks & Tips Using PPP

By Arden Packeer, CCIE #20716 ⋅ April 23, 2008 ⋅ 2 comments

Let’s say you have this scenario: R4 and R5 are connected via a serial cable. Configure IP Addressing so that R4 and R5 are in the 192.168.45.0/24. R4 should have an IP of 192.168.45.4/24. R5 should have an IP address off 192.168.45.5/24. The catch: Do not configure an IP Address with the ip address 192.168.45.4 255.255.255.0 command directly on R4’s s1/1 interface. Let’s have a look at the different ways we can solve this….

Multicast: What is the difference between an igmp filter and an igmp access-group?

By Arden Packeer, CCIE #20716 ⋅ April 8, 2008 ⋅ Post a comment

After doing IE Mock Lab 5, and analyzing it over the last few days, I had an epiphany with regards to an igmp filtering question. The question required you to limit users joining a certain multicast group, and also place a limit on how many groups users in that vlan can join. I immediately thought “Oh cool, no problem ip igmp access-group with a standard access list, and an ip igmp limit and we are good to go! This stuff is easy”. Brrr! Wrong! :)

Tutorial: How to set up backup interfaces

By Arden Packeer, CCIE #20716 ⋅ February 12, 2008 ⋅ 5 comments

The idea behind a backup interface is a simple one. If your main interface goes down, a secondary interface (like ISDN or frame) is brought up and traffic goes through this until connectivity is restored to the main interface. In this article we will be exploring how we can implement such a configuration using the Cisco IOS backup interface command.

Tutorial: How to use Cisco MQC & NBAR to filter websites like Youtube

By Arden Packeer, CCIE #20716 ⋅ December 14, 2007 ⋅ 16 comments

I was asked a great question by one of my clients regarding filtering of websites. He had filtered youtube and google video at his proxy server but with the number of different video sites popping up (metacafe, jibjab etc etc), his filters just couldn’t keep up…and neither could his bandwidth!
One solution to this problem is [...]

Tutorial: How to set up a Cisco router as a Web Server

By Arden Packeer, CCIE #20716 ⋅ December 13, 2007 ⋅ One comment

Need a basic webserver? Did you know that little Cisco router in the corner can act as as one? Well, now you do! In this article we will be setting up a basic webserver on a cisco router. I will be using dynamips to demonstrate this, but it works just as well on a real router! I was using dynamips to simulate a QOS lab where i wanted to mark certain HTTP traffic for shaping. I needed a way to simulate a webserver so that I could test it. Enter the ip http server command!

Troubleshooting: How to Get Interface Summaries in IOS

By Arden Packeer, CCIE #20716 ⋅ December 9, 2007 ⋅ Post a comment

To quickly get a summary of interfaces and addressing information from IOS you could use one of the following:
Router#sh run | include interface|ip address
interface Loopback0
ip address 10.200.200.11 255.255.255.255
interface FastEthernet0/0
ip address 10.1.1.1 255.255.255.0
interface BRI0/0
no ip address
interface Serial1/0
no ip address
interface Serial1/0.1 multipoint
ip address 172.31.1.1 255.255.255.0
interface Serial1/0.2 multipoint
ip address 172.31.11.1 255.255.255.0
interface Serial1/1
[...]

Verifying Connectivity Using A tcl Script

By Arden Packeer, CCIE #20716 ⋅ July 1, 2007 ⋅ 2 comments

During the CCIE lab (or in real life!) it is useful to test connectivity between all your routers. You might have just configured redistribution or completed all your IGP configuration and BGP configuration and want to make sure that you still have full connectivity. We could go to each router and systematically ping each address [...]