What is iRule in F5 Load balancer

An iRule basically is a script that executes against network traffic passing through an F5 appliance. iRules can write simple, network-aware pieces of code that will manipulate network traffic in a variety of ways. Regardless of whether you’re looking to do some form of custom persistence, setting custom settings for the TCP/UDP protocols or rate-limiting [...]

F5 101 Application Delivery Fundamentals-Study Notes-OSI Layer

Explain, compare, and contrast the OSI layers http://www.tcpipguide.com/free/t_OSIReferenceModelLayers.htm  7 – Application Interacts with the user (FTP/HTTP/SMB/SSH/etc.) 6 – Presentation Converts information into data structures that are understandable by/useful to the system (XML/TLV/JSON) SSL/WEP/WPA 5 – Session Allows two endpoints to exchange data for a period of time. NetBIOS, TCP/IP Sockets, RPCs Not necessarily the length [...]

F5 LTM Troubleshooting- Things to check if Pool member is down

Check if the server is reachable from the F5 Load balancer [[email protected]:Active:Standalone] config # ping PING ( 56(84) bytes of data. 64 bytes from icmp_seq=1 ttl=255 time=3.83 ms 64 bytes from icmp_seq=2 ttl=255 time=2.88 ms ———————————————————— If you want to ping from particular vlan you can specify vlan name after –I [...]

Important CLI commands for F5 LTM

TMOS commands run util bash -enable shell show sys self-ip -show self IP’s show ltm persistence persist-records -show persistence records list ltm node [node_address] -show node status modify ltm node [node_address] down -disable node modify ltm node [node_address] up -enable node modify net packet-filter all logging enabled -enable logging for all packet filters delete ltm [...]

BIG-IP F5 LTM Load balancing methods

BIG-IP LTM provides a variety of load balancing methods to choose from. There are two types of load balancing methods. statistic load balancing method / mode. dynamic load balancing mode. 1. statistic load balancing mode:- There are two static load balancing modes. 1.Round robin 2.Ratio 2..Dynamic load balancing mode:- 1.least connections 2.fastest 3.observed 4.predictive 5.dynamic [...]