Posts filed under Tips'n Tricks

International Interest in My 'Brand'

This week, I found the following mail in my mailbox. Not really sure what the scam is, but I'm sure it's gonna cost me money....

(Letter to the President or Brand Owner, thanks)

Dear President,

We are a domain name registration and protection agency in Asia. I have something to confirm with you. We formally received an application on July 16,2013 that a company which self-styled"Togh International Co.,Ltd"were applying to register"redelijkheid"as their Brand Name and some domain names through our firm.

Now we are handling this registration, and after our initial checking, we found the name were similar to your company's, so we need to check with you whether your company has authorized that company to register these names. If you authorized this, we will finish the registration at once. If you did not authorize, please let us know within 7 workdays, so that we will handle this issue better. Out of the time limit we will unconditionally finish the registration for"Togh International Co.,Ltd".Looking forward to your prompt reply.

Best Regards,

David Zhao
Tel:+86(0551)63434624
Fax:+86(0551)63434924
Address:HuiZhou Ave 999, Hefei, Anhui, China

Posted on July 19, 2013 and filed under Annoying, Personal, Tips'n Tricks.

Juniper SRX Apply-groups

A while back I wrote a blog post about enabling global logging on security rules.  This week I applied the same technique to enable ping on all zones for testing / troubleshooting purposes.

Instead of adding ping as a host-inbound-traffic system-service to all zones, and if you have a couple this means some configuring, you can solve this by adding just 3 (three) lines of config to the firewall.

Posted on July 15, 2013 and filed under Security, Tips'n Tricks, Junos.

Configure Application Firewalling On A Juniper SRX

Juniper entered the realm of application firewalling since the release of Junos 11.4 (for SRX platforms). A realm that is mainly dominated by Palo Alto (they basically invented it) and Checkpoint, but more and more vendor's are starting to move in on that territory.
And Juniper is one of those vendors that started to implement Application Firewalling (AppFW) on their (SRX) firewalls. 

This post will show what needs to be done to enable AppFW, and how to configure those policies by using the J-Web interface and the CLI. The Junos software used in this exercise is version 12.1X44.4.

Cisco ISE: Change of Authorization (CoA) not working

We had a wireless security implementation at a customer site which consisted of the following components:

The setup included a wireless lan for guest access by using the Cisco ISE guest portal functionality.

We started by configuring the WLC's and ISE environment and having done that everything worked as a charm. A couple of days later we we were not able to connect to the wireless network.
The error reported in the ISE Authentications overview was:

Dynamic Authorization Failed : 11213 No responds received from Network Access Device

Posted on April 2, 2013 and filed under Annoying, Security, Tips'n Tricks.

Juniper SRX With DNS Proxy Service Enabled

Since the release of Junos v12.1x44D10 for branche SRX firewalls, Juniper added a feature called DNS-Proxy. This features enables the Junos device as a caching DNS server with several additional options. One of those feature is to define a Fully Qualified Domain Name (FQDN) with an IP address which overrides (if it exists) the entry in the 'official' DNS system on the Internet.

Posted on February 20, 2013 and filed under Tips'n Tricks, Security, Junos.

Use One SSL Certificate in an ISPConfig3 Configuration

Last year I implemented an ISPConfig3 configuration for personal use. Mainly to host some e-mail domains, and perhaps some basic websites. This setup relatively easy to implement a should have been a breeze to maintain.... Untill I got an email from the provider last Tuesday, mentioning that my Linux VPS was attacking other hosts around the world..... *GASP*.. my VPS had (most likely) been assimilated into a botnet of some sort, and it was flooding a ton of other hosts.

Posted on February 15, 2013 and filed under Software, Tips'n Tricks, Security.

Moving The Camera

while taking a photo will create (in general) photos that most people will throw away the instant they see it. You can however exaggerate the moving part on purpose, and create some nice abstract photos (as shown below).

Photo & Video Sharing by SmugMug
Photo & Video Sharing by SmugMug

Note that you need to adjust the amount and direction of motion to the circumstances. Another important part is the shutter time in relation to how fast your moving / tilting the camera. This must be long enough to create the blurring part.

Just try it.

Posted on January 11, 2013 and filed under Photography, Tips'n Tricks.

Filter / Block IP Addresses On A Juniper SRX

While exploring the configuration options on the Juniper SRX firewall, I stumbled upon the so-called firewall filters. These filters are not to be mistaken for the firewall policy rules. They are something different, but can be used for achieving similar goals.

In my case, I wanted to see if it was possible to quickly block a list of IP addresses (or subnets) without the hassle of creating addressbook entries (Address Sets). My list of IP addresses consists of known hosts that participate in the criminal ZeuS network. These IP addresses are either Command&Control servers or servers used to transfer (captured) data to. In any case, servers you don't want to communicate with.

The solution on the SRX is to create a firewall filter containing the list with hosts / networks. The filter, in my case, is applied to the outgoing interface (fe-0/0/0).

Posted on January 9, 2013 and filed under Security, Tips'n Tricks, Junos.