New Blog Location / IPv6 Hacking – “thc-ipv6” [Part 1]
I’m pleased to announce the first post in my blog’s new location, here at keepingitclassless.net. I have been running a casual blog from my house for the past two years with mixed success. Residential internet connections as they are, this was usually hit or miss regarding whether or not my blog was even reachable. I’ve moved all that content to a web host which should prove to be much more reliable.Difference for PORTFAST & BPDUFILTER used globally or at interface-level
Portfast + bpdufilter (used together) can be enabled globally or at interface level.
Although the first impression is that the only difference is the global or per-interface effect, this is not entirely true and another subtle and important difference is described in this post.
How to recover Cisco IOS from rommon
Thought I would add this to my blog to help anyone that was in the same situation I had back in April. A big thanks to Richard Morrell ( @richardmorrell ) for this! If you have a Cisco router which … Continue reading
Debunking the IPv6 Has More Security and QoS Myths
I thought that in the year 2011 …when the we’ve had so much talk about IPv6, lots of the smoke about what IPv6 is capable of and what it isn’t capable of would have cleared. Unfortunately not. Today I read this … Continue reading
Matching packets based on their size
Welcome on my very first post on my new fresh technical blog!
This post shows different ways of how to match packets based on their length. While this may not be very common in real production, you will find it useful during your CCIE preparations.
OpenBSD 4.9 SNMP MIBs
I've updated my SNMP MIBs to support OpenBSD 4.9.
IPv6 Subnetting Made Easy
Introduction Call it emotional attachment to IPv4 or whatever you like, but recently I have become more and more interested in finding and easy way to subnet IPv6 prefixes in my head like we are used to doing in IPv4. … Continue reading
Benchmarking OpenBSD: UP vs MP for “make build”
I used to have a machine sitting around that I would power up whenever I needed to build a new OpenBSD kernel or rebuild the source tree due to a patch or a new version of the OS being released. Eventually I moved that machine into a VirtualBox virtual machine running on my desktop. Recently I moved that VM into VMWare's free ESXi hypervisor running on some pretty decent hardware. It got me wondering how much I could lower compile times by adjusting how many vCPUs were allocated to the VM.
The Forgotten skill of technical writing
It’s a beautiful sunny day that puts a big smile on my face and I want to share it with you, so please put a big smile on your face now and before you continue. Your smile will make my day even brighter. OK, back to our post but keep smiling If you are reading [...] No related posts. Related posts brought to you by Yet Another Related Posts Plugin.Enable WordPress Plugins From the Shell
As a follow-on to my previous post about disabling plugins, this script will enable plugins from the shell.
{LISP} IPv6 over IPv4 Transition
First an foremost, I want to thank Ivan Pepelnjak of ipspace.net for taking the time to read, correct and validate these concepts. Taking time out of his busy schedule to make sure this information...[[ Summary content only, you can read everything now, just visit the site for full story ]]
CCIE Home Lab inventory
For reference here is the complete list of Cisco devices, including RAM, Flash, installed modules and IOS versions that I’ve used to build my home lab.
| Device | Platform | RAM | Flash | Modules | IOS |
|---|---|---|---|---|---|
| SW1 | WS-C3560-24TS | 128MB | 32MB | n/a | c3560-advipservicesk9-mz.122-44.SE.bin |
| SW2 | WS-C3550-24 | 64MB | 16MB | n/a | c3550-ipservicesk9-mz.122-25.sec2.bin |
| SW3 | WS-C3550-24 | 64MB | 16MB | n/a | c3550-ipservicesk9-mz.122-25.sec2.bin |
| SW4 | WS-C3550-48 | 64MB | 16MB | n/a | c3550-ipservicesk9-mz.122-25.sec2.bin |
| R1 | 2610XM | 128MB | 32MB | WIC-2T= | c2600-adventerprisek9-mz.124-25d.bin |
| R2 | 2610XM | 128MB | 32MB | WIC-2T= | c2600-adventerprisek9-mz.124-25d.bin |
| R3 | 2651XM | 160MB | 32MB | 2x WIC-2T= | c2600-adventerprisek9-mz.124-25d.bin |
| R4 | 2801 | 256MB | 64MB | WIC-2T= | c2801-adventerprisek9-mz.124-24.T4.bin |
| R5 | 1841 | 384MB | 128MB | WIC-2T= | c1841-adventerprisek9-mz.124-24.T4.bin |
| R6 | 2691 | 256MB | 64MB | WIC-2T= | c2691-adventerprisek9-mz.124-15.T14.bin |
| R7 | 3725 | 256MB | 128MB | 2x WIC-1T=, NM-2FE2W-V2= | c3725-adventerprisek9-mz.124-15.T14.bin |
| BB1 | 2522 | 16MB | 16MB | n/a | c2500-is-l.122-15.T17.bin |
| BB2 | 2520 | 16MB | 16MB | n/a | c2500-is-l.122-15.T17.bin |
| BB3 | 2520 | 16MB | 16MB | n/a | c2500-is-l.122-15.T17.bin |
| CON | 2610 | 64MB | 16MB | NM-16A=, WIC-1T= | c2600-ik9o3s3-mz.123-26.bin |
IPv6 Tutorial: IPv6 Unicast Address
To refresh our memories, we started our IPv6 tutorial with an overview then we moved to IPv6 addressing in general and in this post I am moving deeper into IPv6 addressing types. As promised I will keep things simple and clean for you and for me, so let’s begin. Generally speaking IPv6 unicast addresses play [...] No related posts. Related posts brought to you by Yet Another Related Posts Plugin.Disable WordPress Plugins From the Shell
Lately I've been working with a separate instance of my WordPress site for development and testing of plugins, my theme, etc. I have a helper script that orchestrates the pulling of files and copying of the database from the production server into the dev server. I found that it would be nice to disable certain plugins that I don't want running in the dev instance (ie, plugins that notify search indexes when new posts are made) from within this script.