Cisco IP Phone switchport voice vlan and CDP

I was under the wrong impression for quite a long time that Cisco IP phones require a 'switchport voice vlan ' command on the switchport that they connect to for the Phones to show up in cdp neighbors. The 'sw voice vlan ' command associates an auxilary VLAN to the port that is known as VVID (VLAN ID) for voice service. This VVID is associated with the phone during a cdp neighbor lookup. 

I thought if I didn't use 'sw voice vlan ' then my phone would not show up as a cdp neighbor on the switch. But I guess I was wrong. I set up the switchport as 'sw access vlan 80' where 80 was the Voice VLAN and I could see the phone come up, register, grab the right IP though DHCP and show up on cdp neighbors.

I had to do this because of a Cisco small business SG300 switch that we had to install in one of the maintenance offices that does not support the 'sw voice vlan id' command. 

As always, comments and feedback much appreciated!

ASA 5515-X ASDM/SSH fix

Cisco 4500-X

mDNS Gateway in the Cisco Wireless LAN Controller

I'm not sure why I've taken such an interest in mDNS, service discovery, and the Bonjour protocol, but I have. It probably has something to do with my not being able to use AirPlay at home for such a long time because, like any true network geek, I put my wireless devices on a separate VLAN from my home media devices. I mean, duh. So now I keep an eye out for different methods of enabling mDNS in the network in anticipation of my own experience in my home network becoming one of my customer's experience in their enterprise network.

Fixing iMessage on Hackintosh

Mid December 2012 Apple shut down the Messages Beta for Lion, soon after many hackintosh users started noticing issues with signing into iMessage. At some point in time, people far smarter than me managed to patch a little used bootloader called Clover to allow us to log into iMessage, but Clover is young and still full of random issues. Honestly, it never liked the system id on my partition, so I was never able to use it. But now, it seems that someone has patched our widely used Chameleon bootloader! I’ve tested it on my own hackintosh, and many users are also reporting success.

The instructions are simple enough, and should only take you 3 minutes + a reboot to implement and test!

1. Download the following files to your hackintosh
• FileNVRAM.dylib.zip
• Chameleon-2.2svn-r2170.zip
2. Execute the following commands


sudo mkdir /Extra/modules
cd /Extra/modules
sudo unzip ~/Downloads/FileNVRAM.dylib.zip
sudo rm -rf __MACOSX
sudo rm -rf ACPICodec.dylib


If you have ACPICodec.dylib in your /Extra/modules folder, you need to delete it.

3. Unzip the Chameleon installer, and run it — make sure you install to your boot disk
4. Reboot, and try to login to iMessage

Hopefully this will take Continue reading

Wildcard mask – What’s the difference from subnet mask?

How does the internet work - We know what is networking

What is Wildcard Masking? Wildcard mask is like any other computer IP address basically a group od zeroes and ones (o and 1). To be short, in wildcard mask all number one (1) mean “I don’t care about that position”, and all zeroes (0) mean “I care about that position in binary address”. Let’s take an example where Access list with […]

Wildcard mask – What’s the difference from subnet mask?

IPv6 over AToM pseudowire

Nexgen Storage (Part 2) – Hardware Overview

Nexgen Storage (Part 2) – Hardware Overview

Nexgen Storage (Part 2) – Hardware Overview

Quiz #4 &#8211 BGP over ISP

Your company has more offices and each of them has a separate internet connection. The default route for each office points towards the ISP. Also, within each office you run iBGP using private AS numbers. You try to establish a BGP session between two offices, but the BGP does not come up. Why ?

Troubleshooting MAC-Flushes on NX-OS

Blast from the past: 10 reasons why JUNOS is better than IOS

Preface

Back in late 2009 I wrote my first ever blog post. It must have been ok because I got some comments, a few RT's on twitter and it made @Etherealminds Internets of Interest. Since technicast.net is no longer I thought I would post this here for future reference.

Blast from the past: 10 reasons why JUNOS is better than IOS

Preface

Back in late 2009 I wrote my first ever blog post. It must have been ok because I got some comments, a few RT's on twitter and it made @Etherealminds Internets of Interest. Since technicast.net is no longer I thought I would post this here for future reference.

10 Reasons JUNOS is better than IOS - 7th July 2009

Last week I started on the JNCIA Fast-Track course and I was very impressed. JUNOS is a very good platform and I was amazed at the features and felt compelled to write this down. Maybe Cisco could take some pointers for the next incarnation of IOS…

1. The Candidate Configuration – While IOS has only a running and start-up configuration, JUNOS adds a candidate configuration to the equation. When you make changes, you make them to the candidate configuration. These changes must the be committed before they take effect. This means I can review all of my changes before writing them! (No more frantic notepad copy and pasting)

2. Handling of Multiple Shell Users – The candidate configuration also offer unique ways of handling multiple users wishing to edit a config. By default all users edit a common candidate Continue reading

Blast from the past: 10 reasons why JUNOS is better than IOS

Preface

Back in late 2009 I wrote my first ever blog post. It must have been ok because I got some comments, a few RT's on twitter and it made @Etherealminds Internets of Interest. Since technicast.net is no longer I thought I would post this here for future reference.

Baby Bro, Part 2: Conditionals, Address Types

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# declaring global variables
# no need to put quotes around addr or subnet variable definitions
global ipv4_host:addr = 1.1.1.1; 
global ipv4_net:subnet = 1.1.0.0/16;
event bro_init()
    {   
    if (ipv4_host in ipv4_net)
        {   
        # addr and subnet types are autoconverted to strings with fmt 
        print fmt("%s is in network %s",ipv4_host,ipv4_net);
        }   
    else
        {   
        print fmt("host %s is not in network %s",ipv4_host,ipv4_net);
        }   
   }   

Quiz #3 &#8211 NAT port redirection from inside to outside

As a network administrator, you've been requested to allow the internal clients to connect to a partner server 3.3.3.3 on port 12345. Unfortunately, you discover that your ISP blocks traffic on that TCP port 12345 and allows only some well-known ports, including 8080. How do you implement this ?

phpIPAM installation on Debian 6.0.6

Baby Bro, Part 1: Functions Etc.

• Functions
• Common types and variable definitions
• Loops
• Conditionals
• Iteration of container types
• Basic string and arithmetic operations

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  1 # "add one" is the function name
  2 # (i:int) is the variable and type passed into the function
  3 # the final "int" is the type returned by the return statement
  4 function add_one(received_value:int Continue reading

Basic Bro Language References