video streaming HLS, DASH
What is DASH and HLS? DASH (Dynamic Adaptive Streaming over HTTP) and HLS (HTTP Live Streaming) are both popular streaming protocols used to deliver multimedia content over the internet, but…
understand CAP theorem
The CAP theorem states that a distributed system cannot simultaneously be consistent, available, and partition tolerant No distributed system is safe from network failures, thus network partitioning generally has to be tolerated.[7][8] In…
Raft consensus algorithm on distributed system
Raft: paxos hard to understand, new consensus algorithm consensus algorithm: Leader elections, log replicate https://github.com/etcd-io/etcd/blob/main/raft/README.md This Raft library is stable and feature complete. As of 2016, it is the most…
Kubernetes Quick Start
Learning curve for Kubernetes (K8s) could be steep. For most users who are already familiar with basic networking, OS/Linux, docker container technologies etc, the difficulties , I personally think, is…
Janus Video Room plugin (how webrtc sfu works)
Repo: https://github.com/meetecho/janus-gateway code: video sfu code at: plugins/janus_videoroom.c How sub/pub works: in its plugin implementation: plugins/janus_videoroom.c , there is: struct janus_videoroom_publisher { GSList subscribers; / Subscriptions to this publisher (who’s watching…
srtp and h.235.6 secure rtp
SRTP RFCs and h.235 is Not an easy read. Here is my very high level beriefing: AES Encryption (1) AES is the foundation for both srtp and h.235.6 secured rtp…
What is bro and how to install bro on debian 8
Bro, or sometimes referred to as Bro-IDS is a bit different than Snort and Suricata. In a way Bro is both a signature and anomaly-based IDS. Its analysis engine will…
How to see all network traffic in (KVM) VM
if your NIC ( eth0) of the KVM (VM) is on the host device br0,and you want to see all the network traffics, what you can do is: on the…
DTLS, DTLS-SRTP
DTLS: Basically DTLS is to construct TLS over datagram (UDP, DCCP, etc.) DTLS is similar to TLS intentionally except that DTLS has to solve two problems: packet lost and reordering.…
OpenPGP vs S/MIME
S/MIME and OpenPGP similarity: both depends on public/private keys to encrypt/authenticate msg ( emails), difference: how to distribute the public keys. S/MIME is similar to TLS, need to depends on…
