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F5’s Cookie-Management Model F5 WAF organizes cookies into two enforcement categories: AllowThe policy ignores and permits changes to known cookie headers—useful for application-set cookies that don’t pose a security risk. EnforceThe policy prevents any client-side modifications to specific cookies (e.g., session cookies). Any tampering triggers a Modified Domain Cookie violation. Both allowed and enforced cookies... » read more
1. What Is an F5 Virtual Server? An F5 BIG-IP virtual server binds a virtual IP address and service port to a set of resources (usually a pool of real servers), acting as the front door for client connections. It can be L4 (TCP/UDP) or L7 (HTTP, HTTPS), with features like SSL offload, persistence, and... » read more
Password Recovery on BIG-IP 11.x–14.0 Applies to: BIG-IP 11.x, 12.x, 13.x, 14.0Bootloader: GRUB 0.97 or GRUB2 Reboot into Single-User Mode Reboot the system via console. At the GRUB menu: GRUB2 platforms: highlight your kernel entry, press e, append single (or single fastboot to skip fsck), then Ctrl-x to boot. GRUB0.97 platforms: press e twice to... » read more
1. Why Console Access Matters In normal operation, you manage BIG-IP appliances via: The Configuration Utility (HTTPS GUI on TCP/443) SSH (tmsh or bash shell on TCP/22) However, when those paths fail—due to misconfiguration, network isolation, or software faults—the serial console remains the one guaranteed way to: Complete initial software installations or hotfix upgrades, which... » read more
Connecting to F5 BIG-IP spans two major workflows: Administrator Access: GUI via the Configuration Utility at https://<mgmt-IP>. SSH (ssh admin@<mgmt-IP>) into tmsh or bash for scripting and deep diagnostics. Remote User VPN: F5 Access app on Windows 10, configured under Settings → Network → VPN with the BIG-IP APM FQDN or IP. 1. Preparing for... » read more
Part 1: Configuring NTLM Authentication with BIG-IP APM BIG-IP’s Access Policy Manager (APM) can function as an NTLM SSO authority, bridging domain-joined Windows clients into backend web apps or file shares. 1.1 Prerequisites Licensed BIG-IP with LTM and APM provisioned at Nominal or Full. Network reachability to Active Directory domain controllers (TCP/UDP 389/636, 88). A... » read more
1. Understanding Default VLANs on BIG-IP By design, when you first run the BIG-IP Setup Utility, TMOS automatically creates two VLAN objects in the Common partition: external VLAN: Typically carries traffic between the data‐center network and client networks. internal VLAN: Usually used for traffic between the BIG-IP and backend application servers or private subnets. Each... » read more
1. Obtaining Your BIG-IP License Key 1.1 Trial vs. Production Licenses 30-day Trial License: Ideal for lab evaluations or proof-of-concepts. Perpetual/Annual Production License: Purchased through F5 or an authorized reseller, tied to specific BIG-IP hardware serial numbers or VE instances. 1.2 Requesting a Trial from MyF5 To get a 30-day trial for BIG-IP VE (or... » read more
F5 BIG-IP’s fail-safe features—System, VLAN, and Gateway—provide robust, automated recovery mechanisms that complement traditional HA clustering. By monitoring service heartbeats, network traffic flow, and upstream reachability, BIG-IP can take preconfigured corrective actions (reboots, service restarts, failovers) when anomalies arise, significantly reducing MTTR and safeguarding application availability. 1. Why Fail-Safe Matters in an ADC An ADC... » read more