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It's not the Network! Ok, maybe it's the network...

Jason Rahm

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Top Stories by Jason Rahm

New in the v13 release of the BIG-IP Advanced Firewall Manager is the capability to insert a packet trace into the internal flow so you can analyze what component within the system is allowing or blocking packets based on your configuration of features and rule sets. If you recall from our Lightboard Lesson on the BIG-IP Life of a Packet, the packet flow diagram looks like this: The packet tracing is inserted at L3 immediately prior to the Global IP intelligence. Because it is after the L2 section, this means that a) we cannot capture in tcpdump so we can’t see them in flight and b) no physical layer details will matter as it relates to testing. That said, it’s incredibly useful for what is and is not allowing your packets through. You can insert tcp, udp, sctp, and icmp packets, with a limited set of (appropriate to each protocol) attributes for each. ... (more)

F5 DNS Enhancements for DSC in BIG-IP v13

Prior to v13, F5 DNS assumes that all devices in a cluster have knowledge about all virtual servers, which makes virtual server auto-discovery not function properly. In this article, we’ll cover the changes to the F5 DNS server object introduced in v13 to solve this problem. In the scenario below, we have 3 BIG-IPs in a device group. In that device group we have two traffic groups each serving a single floating virtual server, and then each BIG-IP has a non-floating virtual server.  Let’s look at the behavior prior to v13. When F5 DNS receives a get config message fr... (more)

Lightboard Lessons: Device Services Clustering Failover Methods

In this episode of Lightboard Lessons, I continue last week’s DSC overview with an overview of the failover methods and the changes/enhancements introduced in the recently released version 13 of TMOS. Check back tomorrow for a write up on the v13 failover method changes! ... (more)

Lightboard Lessons: Device Services Clustering

In this episode of Lightboard Lessons, I cover the basics of F5’s high availability architecture called Device Services Clustering, or DSC for short. Make sure you come back tomorrow for the written part of DSC that I’ll update below in this article. ... (more)

Killing my passwords (with his tools)

As I prepped for this password killing journey, I couldn’t get the Fugees “Killing Me Softly” out of my head. Lauryn Hill kills it in that song (pun intended.) So I wrote a little intro you can hum along to the tune…I’ll wait. Feeling my pain with this access, Attacking my sites with his scripts, Killing my passwords with his tools, Killing my passwords with his tools, Telling the whole world, I’ve been p0wned, Killing my passwords with his tools. So we’re not killing anyone, and I am no lyricist, but everyone wants to kill the password, rig... (more)