About Tamihiro Yuzawa

Tamihiro Yuzawa is a network engineer at Sakura Internet, one of Japan's major data center service providers. Before he joined Sakura in 2007, he spent five years at a busy CRM service provider. Both companies have allowed him to stay mostly within the intersection of these circles, and he is pretty much determined to remain in a serious relationship with both Dev and Ops.

One-liner iptables rule to Filter NTP Reflection on Linux Hypervisor

Anybody annoyed enough with massive NTP monlist floods over the weekend? If you did like I did, I believe what immediately … [Read more...]

Centec V330: My Kind of OpenFlow Switch


This is my third and probably last installment of an ongoing story about our quest for OpenFlow 1.0 capable switches with a … [Read more...]

Wanted: OpenFlow Switch With ofp_action To Modify The Destination L3 Address


This article is meant to serve in part as an appendix to my previous post on PacketPushers.net. Therefore, please take a … [Read more...]

OpenFlow 1.0 Actual Use-Case: RTBH of DDoS Traffic While Keeping the Target Online


Sakura Internet operates several data centers across Japan, including this one, and my team is in charge of building and … [Read more...]