advanced·20 min·付费
Replies Leave the Server, But Never Reach the Client
A permitted inside service answers, but its return traffic disappears at the firewall.
场景
Dovetail Museum's outside client can start a permitted session with an inside service, but responses disappear on the way back. Unsolicited connections from the outside must remain blocked. Use the traffic direction and connection state to restore replies without opening a broad path.
学习目标
- acl
- nftables
- stateful firewall
- connection tracking
拓扑与配置
此环境包含 3 台设备（2 Hosts, 1 Router）。你将配置并排查上方列出的网络技能。