Snort 3.0 Alpha 4 is aviable.

What is Snort?

It is an open source intrusion prevention system capable of real-time traffic analysis and packet logging. I just upgraded to Snort 3.0 Alpha 4 and I am extremely happy with the new build so far.

To Lean more about Snort click here.

We are two weeks away from running out of IPv4 addresses


John Curran, CEO of the American Registry for Internet Numbers (ARIN), told attendees at the Campus Technology conference in Boston on Wednesday that the IP address authority’s pool of IPv4 addresses has dwindled to 90,000 and will be exhausted in about two weeks.

“This is a pretty dramatic issue,” says Curran, who founded ARIN in 1997 and was once CTO of Internet pioneer BBN.

Learn more here.

Creating a VLAN on Extreme Switch

Extreme Networks Syntax

Extreme Networks utilizes XOS as their network operating system. It is a Linux-based OS with some pretty handy features. XOS uses a tag and untag syntax similar to the HP’s Procurve line.

* Core_2.7 # create vlan finance
* Core_2.8 # configure "finance" tag 87

Creation of the VLAN name along with the 802.1q tag of 87 was easy. Next, we want to add a few ports the finance VLAN, and add it to a trunk so we can pass finance VLAN traffic between other switches. First, we will remove some ports from the default VLAN for use in the finance VLAN. XOS will not let you add an untagged port more than 1 VLAN:

* Core_2.11 # configure "Default" delete ports 7:5-7:7
* Core_2.12 # configure "finance" add ports 7:5-7:7 untagged
* Core_2.13 # configure "finance" add ports 5:1 tagged
Make sure finance is protected by EAPS. Adding EAPS ring ports to a VLAN could cause a loop in the network.
Do you really want to add these ports? (y/N) Yes

As you can see, we removed 3 ports from the default vlan (7:5, 7:6, and 7:7) and added them to the finance VLAN. Notice that I specified untagged at the end of the command. This is not required, as XOS will add ports as untagged by default unless you specify them as tagged ports. However, it’s a good habit to specify your tagged and untagged ports. If you have not assigned finance to an EAP ring you will the warning above. It is fine to say yes.

I assigned port 5:1 as the tagged port (trunk port), but remember to tag the other end of that port as well. You must have the finance VLAN created and tagged on the other device in order for Core_2 to pass vlan 87 network data.