Collection of useful, relevant or just fun places on the Internets for 23rd June 2012 and a bit commentary about what I’ve found interesting about them:
The Pretty Girls of Ridge Tool, 1953 | Retronaut – Exactly what it says, drawings of pretty women on tools. Random but quite beautiful.
While I’m not sure that ballet shoes match a pipe wrench or pipe threader, I can appreciate this a distraction on a Saturday afternoon.
Packet Pushers Priority Queue Podcast – The Packet Pushers were sponsored to cover Cisco Live. We’ve recorded about eight shows in total and you can find the specialist content on announcements around VXLAN, Nexus 1000V, OnePK, Cat4500 and more in the Priority Queue podcast feed.
Lots of good feedback suggests we got something right.
Why CCDE? – Russ White talks about the CCDE program a little bit.
show brain: The Case of the Missing Switches – Help ?
So far I have ruled out/checked out the following:
- Duplicate IPs
- Network Loops
- The management VLAN is trunked properly across the 10Gbps uplinks to the access switches.
- The management VLAN is in the core’s routing table.
- The access switches are listed in both the mac address table and the ARP table of the core switch.
- The SVI for the management VLAN is UP/UP
I’m looking for ideas of where else to check for the cause of this behavior. Thanks in advance for any help and I promise to post the solution when it comes.
Restricting users to only view parts of the SNMP tree – Cisco | Darren’s CCIE mission – Liked this – it should be part of your security configuration for your network devices:
It’s well known that you can give your customer read-only access to the SNMP tree, but are you sure you want to give them that much information? Even though they can’t change anything, they are able to extract the full configuration, the full routing table and much much more.
As a test I set up SNMP read-only access to a Cisco box I have and ran a full snmpwalk on it. I extracted over 8Mb worth of text data, including full routing tables; ARP tables; OSPF tables etc…
Bit Pilot: Slow TCP but no packet loss -
Many times I’ve heard the claim “out-of-order packets” wreak havoc with your application. Many interpretations conclude that must be because of poor application coding. Blaming others can flow both ways, it seems. My favorite comment in all threads about Duplicate ACKs and Fast Retransmit concludes with ” how the network performance is improved by a server reboot. “
Good links to useful information.
Black Glass Growl Style – My current favourite theme for Growl on Mac OSX.
Introducing the Strategic Solutions Lab Forum | Brocade Communities – Excellent:
Today we add a new forum, Strategic Solutions Lab Publications, to the Brocade community.
We want this forum to be an interactive place where architects, designers and administrators can learn about how to build networks using all of Brocade’s products as well as our partner’s products.
Here you will find a variety of technical publications including reference architectures, design guides, deployment guides and validation test results. The content is classified by category and tagged to make it easy to find what you are interested in.
The Cisco CSR 1000v and the Lab Device it Could Be – Brandon points out that Cisco Cloud Services router is exactly the perfect lab router for students, validation and other skills development processes. Cisco needs to release this in a form that students can use.
Cisco Blog » Blog Archive » Cisco Open Network Environment, Explained – Omar Sultan outlines Cisco SDN strategy and highlighting that OpenFlow needs more than just forwarding tables to be useful.
Let’s cut to the chase–you have probably wondering “what is Cisco going to do about SDN and OpenFlow?”
Passing the CWSP (Certified Wireless Security Professional) | No Strings Attached Show – George Stefancik at No Strins Attached talks about his CWSP experience:
Last week I sat the CWSP exam and passed on my first attempt. My overall score was 91%. I want to share my insight into the exam and what I used to prepare.
