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Entries for 'ace'

In September, Cisco announced that it was ceasing development and pulling back on sales of its Application Control Engine (ACE) load balancing modules.  Customers of Cisco’s ACE product line will now have to look for a replacement product to solve their load balancing and application delivery needs. One of the first questions that will come up when a customer starts looking into replacement products surrounds the issue of upgradability.  Will the customer be able to import their...
On DevCentral we often focus on the out of the box solutions. iRules, iControl, iApps and more are fantastic and exciting technologies, but there's a lot that goes into making an F5 device work before you even get to play with some of those more advanced features. Things like configuring a pool or a virtual server often times get taken for granted on DevCentral, and that is something we'd like to change. The reality is there are many new users coming to the world of F5 all the time, and ...
Everyone has surely (don’t call me Shirley!) at least been exposed to THE CLOUD by now.  Whether it’s the—I’ll go with interesting—“to the cloud!” commercials or down in the nuts and bolts of hypervisors and programmatic interfaces for automation, the buzz has been around for a while. One of F5’s own, cloud computing expert and blogger extraordinaire (among many other talents) Lori MacVittie, weighs in consistently on the happenings and positi...
BIG-IP LTM version 11.1 introduces the DHCP Relay Virtual Server. Previously, it was possible to forward the requests with a set of extensive iRules that probed deeply into the ways of binary, but with the new virtual server style, it is trivial. How DHCP Works DHCP is defined in RFC 2131 and  RFC 2132 for clients and servers, as well as  RFC 1542 for relay agents. The basic (successful) operation of a DHCP transaction between client and server is shown below. A client issues a broad...
Beginning with BIG-IP version 11.2, you may have noticed a new package in the Virtual Edition downloads folder for vCloud Director 1.5. VMware’s vCloud Director is a software solution enabling enterprises to build multi-tenant private clouds. Each virtual datacenter has its own resource set of cpu, memory, and disk that the vDC owner can allocate as necessary. F5 DevCentral is now running in these virtual datacenter configurations (as announced June 13th, 2012), with full BIG-IP VE infrast...
The concept of a friendly URL is a pretty simple one. Basically you want to make things in your application, on your website, etc. easier to access. This stems from the fact that most applications these days make use of increasingly complex paths for a multitude of reasons. Whether it’s user specific content, auto generated pages or otherwise, typing in a URL that looks like “http://domain.com/a7391/users/0928179/events/live/release/20110403/regions.php?region=atl” isn’t ...
  I had a conversation with someone not too long ago on the subject of BIG-IP high availability. BIG-IP is primarily a load balancer, so some forms of high availability (load balancing across multiple web servers for instance) are obvious. But as you probably well know, there are several other characteristics of BIG-IP that can create high availability. The dialog started off slowly (load balancing, health monitors, blah, blah, etc., etc.), then as the possibilities started stacking up t...
Community MVP hwidjaja dropped a bomb-sized nugget of wisdom in the forums last week that I would be remiss if I didn’t write up and share with the greater community at large.  Zenoss has a WMI executable for linux called wmic, which allows you to query via wmi a windows box.  So in the case for Terminal Services, you can use this tool to check if the TermService service is running, and mark the server up/down appropriately.  Because and external executable with be utilized ...
Introduction Transport Layer Security (TLS) is used to secure network communications between two hosts. TLS largely replaced SSL (Secure Sockets Layer) starting in 1999, but many browsers still provide backwards compatibility for SSL version 3. TLS is the basis for securing all HTTPS communications on the Internet. BIG-IP provides the benefit of being able to offload the encryption and decryption of TLS traffic onto a purpose specific ASIC. This provides performance benefits for the application...
Background EAVs (External Application Verification) monitors are one of most useful and extensible features of the BIG-IP product line. They give the end user the ability to utilize the underlying Linux operating system to perform complex and thorough service checks. Given a service that does not have a monitor provided, a lot of users will assign the closest related monitor and consider the solution complete. There are more than a few cases where a TCP or UDP monitor will mark a service &ldquo...
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