Goul(거울; Mirror in English) is a tool for virtual network port mirroring over the Internet for network traffic analyze and/or security monitoring. May useful especially for cloud computing environment.
On legacy infrastructure, with many physical switches, we can use a port mirroring (SPAN; Switched Port Analyzer in Cisco’s term) on the switch for monitoring and analyzing of traffic, and connecting a security appliances. But in cloud computing environment, it is not easy as legacy and in some cases, it is completely impossible.
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