A few weeks ago, I presented my personal email architecture to PLUG, the Philadelphia Linux User Group. I have been using this setup for years now, and every time someone sends me an email at julien[at]linuxwall.info, it reaches one of these server. A lot of this is documented on […]
Debian
Thursday, August 23 2012
Netfilter workshop at Fosscon 2012: the slides
Thursday, August 23 2012. Debian
A couple of weeks ago, I gave a 2H workshop at Fosscon Philadelphia on Advanced Netfilter features. The workshop went well, and I will probably do it again. In the meantime, I posted the slides below. There is a video too, but the quality isn't great, and filming a workshop isn't as good as I hoped […]
Wednesday, August 1 2012
Netfilter and Iptables talk at AWeber
Wednesday, August 1 2012. Debian
Every tuesday, at AWeber, we have a Tutorial Tuesday. Engineers submit topics they would live to present, and everyone vote for the ones they are interested in. A few weeks ago, I presented on Netfilter and Iptables. The goal was to give a quick overview of the firewall of Linux, show some basic and […]
Wednesday, June 6 2012
TCP tuning for the LAN
Wednesday, June 6 2012. Debian
Recently we had conntrack drop connection on one of our memcache node at work. Turns out we were receiving a lot more traffic than usual, but nothing that should have stressed the network stack that badly. We were in the thousand established connections. We got bitten because of the count of […]
Tuesday, May 29 2012
TCP Performances and memcache
Tuesday, May 29 2012. Debian
I am still interested in figuring out the proper set of parameters for a TCP stack on the lan, and today I was taking a closer look at the TCP performances of a farm of memcache servers. Connections from clients to memcache are, for the immense majority, short lived and with small amounts of data. […]
« previous entries - page 1 of 5
