#security

Network

• About primate network
• iproute2 doc

→ Test Port Open

this will test if the remote has port open:

nc -zv <host> <port>

→ Test Ports Open

this will scan for open/closed ports on the remote :

nmap -p 1-10000 <host>

→ Random facts

• one interface can have multiple ip address
• the loopback ip aka lo is either 127.0.0.1 or [::] in ipV6
• a bridge allows miltiple interfaces to connect
• netfilter is a kernel component that allow to hook userspace program to apply on packets
• iptable is such userspace program
• conntrack keeps information of lineage between packets and connectons
• route: Linux prefers to route packets by specificity, by mean the smallest matching gateway
• iptables has 3 concepts: tables, chains, and rules. They are considered hierarchical in nature: a table contains chains, and a chain contains rules
• the iptable maskerade allows to make pods to have the same ip as their node