软件包：knockd（0.8-2 以及其他的） [debports]
small port-knock daemon
A port-knock server that listens to all traffic on a given network interface (only Ethernet and PPP are currently supported), looking for a special "knock" sequences of port-hits. A remote system makes these port-hits by sending a TCP (or UDP) packet to a port on the server. When the server detects a specific sequence of port-hits, it runs a command defined in its configuration file. This can be used to open up holes in a firewall for quick access.
其他与 knockd 有关的软件包
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- dep: libc6.1 (>= 2.34)
- GNU C 语言运行库：共享库
同时作为一个虚包由这些包填实： libc6.1-udeb
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- dep: libpcap0.8 (>= 0.9.8)
- system interface for user-level packet capture
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- dep: logrotate
- 日志滚动工具
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- dep: lsb-base (>= 11.0.0)
- Linux 标准规范初始化脚本功能的过渡软件包