Aaron's Worthless Words

Latest Posts

Wireshark and EtherIP Packets

2011-06-04 ·2 min read

I got a call from our Systems and Security guys today to talk about a Wireshark capture they had done from a user VLAN. They had noticed two frames that were destined for some seemingly random host in …

capture etherip header wireshark

OSPF Notes - LSA Types

2011-06-02 ·2 min read

Yes, it is inevitable that I cover these. I’m sure network types will be next. Per my usual request, please correct my stupidity. Type 1 - Router : This LSA type lists all the routers by RID as …

350-001 ccie cisco dbd hello lsa lsack lsr lsu message ospf type written

OSPF Notes - Neighbor States

2011-06-02 ·2 min read

My prediction about covering network types was wrong. I’m going to puke out some information about neighbor states for now. As is always the case, corrections are welcome. Down : No hellos have …

350-001 ccie cisco dbd hello lsa lsack lsr lsu message ospf type written

OSPF Notes - Message Types

2011-06-01 ·2 min read

I have had my nose deep in several books in preparation for my CCIE R&S written exam, so I haven’t been blogging much at all. Now that I’ve made it to the more familiar topics, …

350-001 ccie cisco dbd hello lsa lsack lsr lsu message ospf type written

Home-grown IOU Scripts

2011-05-16 ·6 min read

I’m sure you’ve all heard of Cisco IOU by now, and I’m finally catching up with the other bloggers of the world by mentioning it. It’s an executable version of an IOS image …

bash cisco emulator iou lab script

Cisco Live 2011 Schedule

2011-04-29 ·2 min read

For the first time ever, I’m headed to Cisco Live - the big Cisco users conference in Las Vegas! I usually don’t go to these things since I wind up just hanging out by myself, but …

2011 cisco cllv11 conference las las-vegas live users vegas

The Four Stages of Expertise (In Your Mind)

2011-04-20 ·3 min read

If you’ve worked in any particular area for some significant amount of time, you have probably noticed that how much you think you know about a subject has changed over time. This is nothing …

assessment expertise four self stages

Some Exercises with IPv6 ACLs

2011-04-15 ·4 min read

ACLs in IPv6 aren’t that different from what you’re used to dealing with in the IPv4 world. You create a list of denies and permits for use with some other structure like filtering, PBR, …

access access-list filter interface ipv6 list matches sequence traffic traffic-filter

News - Cisco Announces EOL Schedule for 6500s

2011-04-01 ·1 min read

This is a surprise, but Cisco has announced the end of life of the 6500 switches that we all know and love. Usually Cisco gives a platform a few more years after they decide to retire it, but the …

6500 april day eol fools switch

Configuring an IPv6 Tunnel with Hurricane Electric

2011-03-31 ·2 min read

My ISP at home is great. I have infinite bandwidth because they have no idea how to do any rate limiting. Heck, they’re not even skilled enough to know that I have several public IP addresses …

broker dns eui-64 ipv6 ipv6ip manual tunnel