Net-SNMP 5.6.1 Missing hrSystemProcesses OID

I just upgraded a couple of machines to OpenBSD 4.9 and noticed the hrSystemProcesses OID was not being returned by Net-SNMP 5.6.1 (from the 4.9 ports/packages collection) . joel@theta:~% snmpwalk -v2c -c public theta .1.3.6.1.2.1.25.1.6.0 SNMPv2-SMI::mib-2.25.1.6.0 = No Such Instance currently exists at this OID I know for sure this worked on OpenBSD 4.8/Net-SNMP 5.4.2.1. Turns out there is a bug in Net-SNMP 5.6.1 (bug 3166568) that's causing this. It's been fixed in their SVN tree.
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OpenBSD 4.9 SNMP MIBs

I've updated my SNMP MIBs to support OpenBSD 4.9.

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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.

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Hitting the PF state table limit

I recently had an issue with an OpenBSD firewall where the number of state table entries was hitting the default limit of 10,000. When this limit is reached, no new state entries can be created. If you're using "keep state", "modulate state" or "synproxy state" on your rules or if you're running OpenBSD 4.1 or newer (where "keep state" is the default on all rules) this could mean that:

  • You cannot make new connections through the firewall
  • You cannot make new connections to the firewall
  • You cannot make new connections from the firewall

So.... if you hit the state table limit it's kinda bad, mmmkay?

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