Capture filter and Display filter in Network Analyzer

Capture filter is set before collecting packets. It is applied at the time of data acquisition and it impacts the size of the capture. It does not have as many variations as display filter and is usually not aware of protocols above TCP/UDP layer. A common form of capture filter is BPF (Berkerly Packet Filter) … Read moreCapture filter and Display filter in Network Analyzer

Docker Compose, Docker Stack and Docker Swarm

This posting covers some basic docker orchestration tools. Docker Compose Docker Compose’s predecessor is a tool called Fig developed by Orchard, which was acquired by Docker in 2014, with Fig renamed to Docker Compose. Docker Compose is the official container management tool. It is essentially a python script that parses yaml file, to make Docker … Read moreDocker Compose, Docker Stack and Docker Swarm

Introduction to Active Directory (AD)

Workgroup, homegroup and Windows Domain A workgroup is a group of computers on the same local network. A Windows computer not joined to a domain is part of a workgroup. In a workgroup, no computer has control over any other computer and it does not require a password. Any computer can join or leave a … Read moreIntroduction to Active Directory (AD)

Networking basics 2 of 3 – Layer 4 and common network configurations

Transport Layer Transport Layer handles multiplexing & de-multiplexing through ports. Port is more or less a virtual concept. Source port is usually ephemeral. Two dominant protocols are TCP and UDP. TCP relies on acknowledgement. TCP control flags are SYN, ACK, FIN, URG, PSH, RST, ECE, CWR. TCP connection is established by 3-way handshake and torn … Read moreNetworking basics 2 of 3 – Layer 4 and common network configurations

Storage Nitty-Gritty 3 of 5 – NAS and Object Storage

NAS (network attached storage) NAS server is dedicated to file-serving. NAS device runs its own specialized operating system that is optimized for file I/O, integrated hardware and software component that meets specific file-service needs, and performs file I/O better than a general-purpose server. NAS device can serve more clients than general-purpose servers and provide the … Read moreStorage Nitty-Gritty 3 of 5 – NAS and Object Storage