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SPANs on Cisco Switches

I can’t believe I haven’t blogged on this yet. SPANs are one of my favorite things in the world. The switched port analyzer (SPAN) is a mechanism on Cisco switches that allows you to take traffic on one port and copy it to another. It’s generally used

CSM Probe Status of ???

I must be bored since I’m posting again. A colleague asked me to change the failed value of a TCP probe today. It was no big deal, but, when I looked to see the status of the change, I noticed interesting stati of the RIPs. switch#sh mod csm

Fail Actions on CSM Serverfarms

I’ve talked about probes and stuff on the CSM, but I never mentioned what happens to the connections to a server that fails. That is, if I’m connected to server A in a cluster and that server suddenly commits ritual seppuku, what happens to my connection through the

VLANs on Linux

My home network has a Linux box running IPTables as it’s center point, and, since there are four networks, it has 4 NICs and 4 cables into the switch. I kept running into problems with the NICs (they would reorder depending on what flavor of Linux was installed), so

Renesys Analysis of SuproNet Announcement Debacle

Earl Zmijewski of Renesys has an analysis of the SuproNet incident that took down a good bit of the Internet on Monday. From the blog: This single Czech provider announcing a single prefix caused a huge increase in the global rate of updates, peaking at 107,780 updates per-second. This

Unix Epoch + 1234567890 = Next Friday

I’m kind of an obsessive-compulsive when it comes to numbers (1, 2, 3, 4, 5…), so I’m fairly excited about next Friday (..6, 7, 8, 9, 10…) when Epoch time reaches 1234567890 at 18:31:30 on 13 February(…11, 12, 13, 14, 15…). I’m sure my

Filtering Out the Noise on the Edge

There’s a lot of noise on the Internet. I’m not talking about certain news sites, either; I’m talking about stuff like port scans or attempts on weak services from all sorts of bad people on the Internet. A large chunk of that noise can be filtered by