Tag Archives: Firewall

Vyatta Blocking Email Download of Attachments

I check my site logs pretty often to find out how people are arriving at this blog and have seen an increase in traffic that points to an exchange I had with a visitor about Vyatta blocking email attachment downloads.  I wanted to post this quick entry so that people looking for a quick fix could get to this without running through the complete conversation on the other post: http://d3planet.com/rtfb/2009/11/02/vyatta-firewall-basics-and-configuration/

Here’s the quick and dirty solution:

Problem:  Vyatta is blocking download of email attachments.  This solution only applies if your implementation is using the web proxy and squidguard URL filtering.

Solution:  Use the following command to get Vyatta to allow IP addresses to be called directly.

set service webproxy url-filtering squidguard allow-ipaddr-url

or

set service webproxy url-filtering squidguard rule XX allow-ipaddr-url

Keep reading for more info on the issue…

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Create a Router with Front Firewall using Vyatta on VMware Workstation

Vyatta is a powerful enterprise class software router that has some really incredible features.  It has a CLI (command line interface) as well as a web interface.  I’ve gotten a few requests about configuring it as a front system but until now have only really worked with Vyatta as a pure routing appliance internal to my network.  It has been my traffic cop between my lab subnet, user subnet, and server subnet but now I’ll try to configure it as a front end based on an exchange I had on another thread.

This should be able to give you some examples with getting started using Vyatta as a front firewall.

If you don’t have the software, you can download a free version, called Vyatta Core, from Vyatta’s website.  You have to register, but don’t worry, they won’t spam you and they have extensive documentation on the product that you can pull down after registering.  It’s an excellent resource to learn and practice your routing skills, especially since you can stand up the product on random hardware or in a virtual machine.  Vyatta even has downloads specific to VMware implementations.  Check it out and come back if you’re interested in seeing this post through.  http://www.vyatta.com.

And now for the good part.

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SSL Sniffing – How Safe Is Your Information?

Some firewalls now have a new feature (or not so new), unbeknownst to most web users:  The little lock in your browser that shows that you are using a secure connection is not what it used to be.

When you make a secure connection to a web site, your bank for example, and you see the little lock appear, that is an indicator that your browser is connecting to and exchanging information with a server through a secure, certificate based channel.  Behind the scenes, some encryption keys are exchanged and the information that you are transmitting and that is being transmitted back to you is encrypted and not easily readable by others.  That perception of safety is the basis of all financial, as well as other, transactions on the Internet and you as the consumer believe when you see that lock, your information is safe.

There’s a lot that happens and can happen in between you and the server that you’re communicating with.  To illustrate what I’m talking about, here is a simplified diagram of a typical network configuration.  Using the example of a bank:

sslsniffing001

You can click the image above to enlarge it.  Your computer connects to your bank through firewalls.  The close firewall protects your network and the firewall on the bank’s end protects their network.  The is typically a certificate installed on the bank’s firewall and server that allow you to establish a secure connection to that server.

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Team Foundation Server 2010 Installation Experiences and Lessons Learned

Do it right the first time! 🙂

There’s quite a few posts on Team Foundation Server 2010 (TFS) and how to install and configure it, as well as a really good CHM file from Microsoft on the same topics, so I won’t go through duplicating what everyone else has done and will link to one at the bottom of this post.  I’m writing this just to relay the experience I had with getting the product configured just the way I wanted it, or some facsimile thereof and some lessons learned.

 tfs001

After viewing some videos on YouTube of TFS, reading some of the Microsoft marketing material, and some of the posts on it, I decided to stand up TFS in my environment to see how well it works and to explore changes since the last version.  Right now, the team I lead isn’t really using any ‘set’ collaborative product.  We tend to work in small teams on projects so the need isn’t really there, though I’m sure the organization wouldn’t hurt.  We’re currently using Subversion as our source repository and occasionally use MOSS or WSS to collaborate.  Otherwise it’s phone calls and emails since we also tend to bounce around the country.  Enough background, on to TFS installation…

After reading through a few blog posts and Microsoft’s documentation on how to install and configure TFS, I stood up a Windows Server 2008 R2 VM and installed SQL Server 2008.  I was going with a single server install.  I followed the documentation to the letter for a single server install, and everything worked out just fine.  WONDERFUL!  GREAT!  So far…

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Vyatta Firewall Basics and Configuration

For a post that is a little more advanced, try this one: Create a Router With Front Firewall Using Vyatta on VMware Workstation.

Otherwise… read on. 🙂

A few weeks ago, I installed Vyatta Open Source as a router internal to my network to see how it handled traffic between multiple subnets.  To put it plainly, it worked like a champ!  I put the router in place, assigned IP addresses to the NICs (network interface cards), and let the system do its thing.  It now connects traffic between my physical network, my production virtual network, and my virtual lab running on ESX 3.5.  I can easily manage most firewalls and routers that have a GUI but Vyatta presented a new challenge to me.  In the case of this system, for some tasks it’s a lot easier to use the command line interface (CLI).

So without further ado, here’s the basics of Vyatta’s firewall.

console001

Keep reading…

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Vyatta Community Edition, Open Source Router

I’ve been running multiple subnets in my lab, and been dealing with the pain of having to VPN into each separate subnet when needing to make a change, test something, or deploy something.  It’s been a learning experience and I’ve configured both OpenVPN and ISA Server 2006 VPN’s and successfully bounced around the various networks as necessary, but it’s been a real pain to have to VPN into one network, grab files, and then VPN into a different network to test and deploy those files, as an example.  So I began a hunt for an open source router that would give me more control than Untangle, which is an excellent open source routing and firewall tool.  Simply put, I wanted finer grained control than Untangle is designed to supply. As an example, I wanted to be able to filter network traffic based on mac addresses instead of IP addresses.

In my search, I came across Vyatta, which is an open source networking package that likes to compare itself to Cisco in functionality and control.  I decided to check out their site and found that they offer a free ‘Community Edition’.  I looked at the features of the community edition, then checked the VMware Appliances site and found that Vyatta has a pre-built VMware appliance.  NICE!  I filled out a short registration form, downloaded the appliance and all the documentation, which is thick to say the least, and fired up the appliance in VMware Workstation.

console001

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