This is a list of operating system distributions designed for use as the operating system of a machine acting as a router and/or firewall.
List of router or firewall distributions – Wikipedia, the free encyclopedia.
nf_conntrack and the conntrack program
Anyway I did at a fast
cat /proc/net/nf_conntrack | grep 5060to get all connection tracking entries for SIP. And I found more than one, here is on example.
via nf_conntrack and the conntrack program | Robert Penz Blog.
More info on conntrack here…
The timeout for this entry is 180 sec and 172 seconds to go, and the SIP client was all the time sending new probes and therefore the connection was never dropped. What can you do in this instance? You can install conntrack. It is a userspace command line program targeted at system administrators. It enables you to view and manage the in-kernel connection tracking state table. If you want to take a look at the manual without installing it (apt-get install conntrack) you can take a look at this webpage which contains the man page. With this program I did delete the entries with the wrong IP address and everything worked again.
SquidGuard
SquidGuard is a URL redirector used to use blacklists with the proxysoftware Squid. There are two big advantages to squidguard: it is fast and it is free. SquidGuard is published under GNU Public License.
via SquidGuard.
Building an XMPP Server – Part 1
After reading several reviews, I chose ejabberd. Ejabberd can be downloaded from the previous link, but it also has the advantage of being located in the Ubuntu repositories. I created a Ubuntu Server and loaded ejabberd using “sudo apt-get install ejabberd”. Couldn’t be easier! And using a virtual machine to build the server means I can install it at customer locations without building a new server every single time, it will just need to be reconfigured once it is spun up.
via Building an XMPP Server – Part 1 | Jameson Networks Blog.
Ejabberd is also part of the fedora repositories but not part of the CentOS repos.
Ignite Realtime: Openfire Server
Openfire is a real time collaboration (RTC) server licensed under the Open Source Apache License. It uses the only widely adopted open protocol for instant messaging, XMPP (also called Jabber). Openfire is incredibly easy to setup and administer, but offers rock-solid security and performance.
Citadel
Citadel is easy, versatile, and powerful, thanks to its exclusive “rooms” based architecture. No other platform seamlessly combines so many different features using this familiar and consistent metaphor.
Apache Vysper
Documentation – Apache Vysper.
Apache Vysper aims to be a full blown XMPP (=eXtensible Messaging and Presence Protocol) server.
The core of XMPP is defined in the standards RFC3920 and RFC3921.XMPP is more commonly known as ‘Jabber’.
XMPP Technologies Overview – The XMPP Standards Foundation
XMPP is the Extensible Messaging and Presence Protocol, a set of open technologies for instant messaging, presence, multi-party chat, voice and video calls, collaboration, lightweight middleware, content syndication, and generalized routing of XML data.
XMPP was originally developed in the Jabber open-source community to provide an open, secure, spam-free, decentralized alternative to the closed instant messaging services at that time. XMPP offers several key advantages over such services:
via XMPP Technologies Overview – The XMPP Standards Foundation.
Linux List The Open Ports And The Process That Owns Them
How do you list the network open ports on your server and the process that owns them? The answer is simple use the following command (must run as root):
sudo lsof -i
sudo netstat -lptu
via Linux List The Open Ports And The Process That Owns Them.
I don’t know why I keep forgetting this.
Is Maintenance Making Your Facility Less Reliable?
“Maintenance is a very lucrative business,” said Fairfax, who said guidance from equipment vendors sometimes slip into FUD (fear, uncertainty doubt) rather than sound methodology. “They want to keep selling their maintenance plans. To overcome this preventive maintenance threat, we must attack false learning. More is not always better.”
via Is Maintenance Making Your Facility Less Reliable? » Data Center Knowledge.
File this under don’t fix what ain’t broke.