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

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

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!

//Richard

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