← из прошлого урока
You saw SYN/ACK on a single host. Now the same thing, but between different ones: three containers, two segments, and a packet that has to physically go somewhere and come back. You figure out where routing breaks.
Средний
20 мин · урок входит в курс «Средний»
You have three containers: two hosts (h1, h2) and a router r1.
Between them run two Ethernet "buses":
10.10.1.0/24 connects h1 (10.10.1.10) and r1 (10.10.1.1)10.10.2.0/24 connects r1 (10.10.2.1) and h2 (10.10.2.10)There is no direct link between h1 and h2; packets have to go through
r1. Right now h1 does not know how to reach h2's subnet, and r1
is not yet set up as a router. You fix this by hand, step by step.
Switch between nodes with the "nodes" tabs at the top right.
Чтобы запустить sandbox и пройти этот урок целиком, нужен соответствующий курс. Внутри - ещё много практических уроков того же уровня и сквозной прогресс.
дальше →
L3 connectivity is in place; the machines can see each other by IP. But
people do not remember IPs, they remember names. Next comes DNS:
resolvers, /etc/resolv.conf, and how dig shows the real path of a
query.