slaptijack

I've noticed a mysterious new protocol popping up in my protocol lists lately: 19101/TCP. Apparently, this TCP port is used by the Clubbox service. I 'm not fluent in Korean, so I can't really tell you what the site says, but I can tell you what it does!

Clubbox …

What is Local <acronym title="Policy-Based Routing">PBR</acronym>?

Policy-based routing makes routing decisions based on factors other than normal routing protocols. For example, it might be necessary to forward all <acronym title="Session Initiation Protocol">SIP</acronym> packets via a more expensive low-latency link while all other traffic use …

The main advantage of using Red Hat Enterprise Linux over something more cutting-edge like Fedora is the length of time Red Hat supports their Enterprise product.

The Fedora Project only supports the current and previous versions of Fedora (formerly Fedora Core). Since Fedora utilizes a six month release cycle, you …

This is a silly mistake that can be easily avoided.

I was working on a Perl script that grabbed network traffic information from my ntop server and reported on it. ntop provides an <acronym title="Application Program Interface">API</acronym> that specifically supports Perl. Although I was seeing the data …

As you can see, I'm giving a new widget a whirl. BlogRush is an RSS syndication service that presents on-topic posts from around the Blogosphere to your readers.

Generally, I don't buy into all this "Blogosphere" whoo-ha, but in this case it really seems to be a win-win situation. Readers …

A troubleshooting note showing how VLAN-indexed SNMP community strings expose per-VLAN bridge-MIB data on legacy Cisco switches.

By default Point-to-Point Tunneling Protocol (PPTP) will now work properly through a Cisco Adaptive Security Appliance (ASA) firewall or it's forerunner the Cisco <acronym title="Private Internet EXchange">PIX</acronym>.

Prior to PIX software version 6.3, allowing PPTP to work through a PIX was a painful procedure involving static …

The following are the Peer-to-Peer (P2P) protocols recognized by Cisco's NBAR Protocol Discovery.

• bittorrent
• directconnect
• edonkey
• fasttrack
• gnutella
• kazaa2
• napster
• winmx

If I've missed any, leave a comment below or use the Slaptijack Contact Form to update me.

Thanks!

Occasionally you might need an Autonomous System Number (ASN) that is only used on your network. The need for these should be infrequent, but it does happen.

One thing that comes to mind is a customer that connects to your network in multiple locations. That customer needs an ASN for …

Two more updates for applications based on the Horde Application Framework were released today. Once again, the product descriptions are from Jan Schneider of The Horde Project.

• Horde Groupware 1.0.2 - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
• Horde Groupware Webmail Edition 1.0.2 …

Sam Varshavchik has announced an updated release of the Courier Mail Server and Courier IMAP Server (Courier 20070921). Changes since the last release include

• A looping SPF query is an UNKNOWN result
• Ignore SIGPIPE errors in couriertcpd
• SqWebMail - remove some hardcoded settings. Use SQWEBMAIL_RANDSEED to force the random number seed …

In a recent article on Read/WriteWeb about Online Office Apps, Josh Catone mentioned off-hand that he didn't like the Gmail user interface. Since I've been using the Gmail interface exclusively for quite a while, I decided it might be time to talk about the problems I have with the …

You'll find that some network problems can only be solved by sticking a packet sniffer on the network and seeing what the packets are doing. In a switched environment, this will not work properly since each port is configured to only broadcast traffic destined for the MAC addresses it has …

One of my pet peeves is Cisco switch and router interfaces that remain unlabeled. There is nothing worse that trying to debug a network problem when the problematic interface is unlabeled. Instead of spending valuable time working on the actual problem, you've got to trace down where this cable goes …

I've been in the situation before were I needed to discover the neighbors of a Cisco device programmatically. This is useful in a case where you want to crawl a network without hard-coding a list of devices into your script. By default, all Cisco devices have Cisco Discovery Protocol (CDP …