Posts Tagged ‘network proximity’

#Citrix #GSLB blog post – GeoLite City as NetScaler location database

December 3, 2012 Leave a comment

This was a good blog post! And I really like GSLB, of course there may be functionalities that you’d like to advance etc but it’s great! And this post addresses one topic of it;

You may know this problem: Your boss made you build several data centers around the globe with a bunch of NetScalers in the mix to load balance services across the various locations using GSLB (Global Server Load Balancing). But when it comes to configuring a static proximity geo IP database to help with that not too easy to understand dynamic proximity feature you notice most of these databases are commercial and you are out of budget. Luckily though, there are several free versions of geo IP databases out there, which reportedly work quite well. Before using one of those, you should carefully review the license terms. Some aren’t necessarily free for commercial use…

Moreover, these free versions are very popular, well maintained and were frequently updated (I say were because with the assignment of the last IP block by RIPE earlier in 2012 there shouldn’t be too many changes to the databases anymore) . So it’s fair to say that many of our clients who are using these databases are very satisfied with them.

Why is a database with IP addresses and address blocks necessary for such a setup? GSLB responds to DNS requests for a domain name with an IP address of a member service. Which service IP is returned is dependent on the load-balancing algorithm used, for example least connection, simple round robin or more commonly used, proximity to the client (or the clients local DNS to be precise). For proximity based GSLB, when a client sends a DNS request, the system determines the best suitable site…

Continue reading here!


Web Interface 5.4 vs. StoreFront 1.2 – What has changed since last comparison?

September 17, 2012 Leave a comment

Hi all,

Ok, let’s start this post by thanking Thomas Koetzing for his newly updated post! Thx a lot man and keep up the great work!

Thomas has summarized most of the features that Web Interface 5.4 offers and how StoreFront matches that, it’s a really good table and one that all of you architects out there shall review and plan accordingly. What are you using today and what are the needs going forward, then once you have your business needs and requirements you have your wanted position and it’s just to make a roadmap of how your service gets there, or not if features are missing, then call Citrix!! 😉

I think that Thomas’s summary is good, one thing to consider though that I really urge you to think of is if you’re planning to use multiple access points around the world for an enterprise. How would this work? What if you have one in Europe, APAC and Americas? You would probably have a couple of NetScalers with AGEE and use GSLB to nicelly provide a simple URL for everyone and network proximity or so to direct the users to the closest entry point. But that regional NetScaler would most likely have its own set of StoreFront servers including a pair of AppControllers to ensure that you don’t have a single point of failure in terms of your internal WAN to get to another regional StoreFront/AppController setup from the local NetScaler AGEE? And if you then think like me; how are you going to do this?

The StoreFront server is relying on the DB for the subscriptions that the end-users have done in terms of selection apps etc for his “workspace”, and the same is with the AppController! There is no “supported” way today that I’ve found where you can synchronize two or multiple sets of HA-pairs of StoreFront or AppControllers so that no matter where the end-user is logging on he/she doesn’t get the same set of subscriptions (apps, desktops, SaaS, etc.) and neither his/her SSO credentials if AppController is used. And just imagine how it would be if you integrate and use the federation of SaaS applications on all locations and an end-user is logging in and subscribing from multiple AppControllers agains for instance Salesforce, and how would you do the overall enterprise reporting? This is the enterprise feature I’m missing and I’m hoping that we could see some solution to this fairly soon!

And it’s now you should start evaluating StoreFront, this is key to understand what it offers now so you know where you are compared to your As-Is architecture with Web Interface and map that to your wanted position going forward!

But a part from that I must say that Thomas did a great job in his comparison and read more about it in detail here!


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