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10 hands-on labs walking through every layer of DHCP in OVN — from the NB database schema all the way to raw packet construction in ovn-controller's pinctrl. Every concept from the writeup, exercised with hands-on verification.
I traced the full lifecycle of DHCP in OVN — from the moment you attach DHCP options to a logical port, through northd scanning, logical flow generation, action encoding, ovn-controller packet-in handling, all the way to the raw DHCP packet being constructed and injected back into the datapath. Here's everything I found along the way.
14 hands-on labs covering every aspect of OVN ACL processing: direction mapping, allow-related conntrack, drop ACLs with BLOCK hints, stateless ACLs, tiered evaluation, universal flows, port groups, reject actions, logging, and more.
I traced the full lifecycle of an OVN ACL — from the moment you type ovn-nbctl acl-add, through northd scanning, pipeline stage generation, conntrack commitment, all the way to the OpenFlow rules hitting your datapath. Here's everything I found along the way.
I built a 5-node OVN cluster on libvirt, implemented a VPC with private subnets, SNAT, and load balancing, debugging through a database crash, stale chassis references, a per-chassis conntrack design constraint, and deep OpenFlow tracing. Full technical walkthrough.
I exploit a misconfigured Nginx alias to read the jwt.secret file, then forge an admin JWT token to access the hidden post containing the flag.
I share how I got into CTFs, which tools and categories to start with, and why practicing through challenges beats passive learning every time.
