FLYLABS - SSH Keep-Alive

SSH Keep-Alive

Some firewall / router configurations doesn't treat SSH (TCP 22) as a high priority service. Some also keep the service low in the IP connection tracking table. This, among other possible reasons, break our SSH connections making the administrative work to be very annoying. Here is a tip for configuring SSH Keep-alives properly in OpenSSH.

Point your editor to:

# vi /etc/ssh/sshd_config

Make sure of enabling the following option

TCPKeepAlive yes

Set the following variable to whatever you want (keep-alive interval in seconds).

ClientAliveInterval 1

Note: Setting it to 1, might look a little bit agressive, but it works just flawlessly.

Posted by Administrator on Wed, 2 Nov 2011

Installing Luarocks in CentOS

Posted on Fri, 4 Nov 2011

There seems to be something wrong with CentOS' lua package (version 5.1.4). After installing lua via yum, compiling luarocks in /usr/local/src/ and running the luarocks command, you will end up with the following error:

SSH Keep-Alive

Posted on Wed, 2 Nov 2011

E.164, ENUM & NATPR

Posted on Mon, 27 Dec 2010

First of all, the acronym ENUM stands for E.164 NUmber Mapping. ENUM is an specification on how to use the DNS system to map telephone numbers (in E.164 format) to an URI, email address or internet protocol address. E.164 is the number format for national and international telephone numbers, normal telephone numbers. The E.164 notation is documented in the ITU E.123 standard.