SNMP Counters - Collection Interval Variation

Counter data types are commonly used in SNMP monitoring. They are extremely useful, but there’s a couple of caveats around how to use them. Here’s a couple of issues I’ve...

CloudFlare: That Was Easy

I switched this blog over to using CloudFlare a few days ago. It’s all been pretty painless, and I highly recommend it to others.

APNIC - final 'final' /22 now available

APNIC entered their “final /8” phase in April 2011. From that time, new and existing APNIC members could request a maximum of one IPv4 /22 prefix. Once you had requested...

Using Paramiko/Python with FortiMail

Fortinet makes an email security/anti-spam appliance called FortiMail. I wanted to collect spam and virus statistics from it, to integrate with our Network Monitoring Systems. Unfortunately the data is not exposed via SNMP or API,...

Cisco Political Comments - Why?

I freely admit to not truly understanding the American political/economic system. Sure, I get the general mechanics of it, but I don’t understand the subtle plays, and why people do certain...

Getting More Information From Your Logs

Packet Pushers normally focuses on networking, but episode 192 covered “Logging Design and Best Practices.”  I often think about logging in the context of network management, so it was good...

Is Cisco Struggling with Their ACI Messaging?

Cisco ACI represents a significant shift in the way we approach networking. This sort of shift will need massive customer education to explain their new vision. I’m getting the impression...

Comparing Employment Relationships

I periodically re-evaluate my career, and my current position, and try to decide A) Should I change, and B) What sort of change should I make? One part of evaluating...

War Stories: Proxy ARP Auto-Configuration

This article is Part 5 in a 12-Part Series. Part 1 - War Stories: Loops that Permanently Broke the Network Part 2 - War Stories: Switches Lying about Duplex Mismatches...

Proxy ARP Sucks

Proxy ARP was often used in network designs 10–15 years ago, to enable NAT. It helped get around some specific challenges, but it was always an administrative hassle, and caused...

HP IMC 7.0 E0202: Steady Improvements

When I’m evaluating products, I’m more interested in their progression and development, than the exact feature list currently shipping. I like products that have a frequent release cycle, with a...

Monitoring IPv6 vs IPv4 Traffic on Juniper SRX

I use a Juniper SRX 110 at home, and my ISP is enlightened enough to offer IPv6 by default to all customers. My devices are dual-stack, and I know that a...