PHREL是一个针对每个主机的网络流量限制工具，它会跟踪每个输入流量情况，并通过在iptables来配置流量限制。
Theinsertedchainmayeitherratelimitorblocktheoffendinghostforaperiodoftime.Theinsertedchainisautomaticallyremovedwhentheoffendinghost'strafficlevelsreturntonormal.PHRELisparticularlywellsuitedtoprotectingnameservers(DNS)fromrandomhoststhatfloodrequests,andtopreventingSSHbruteforceloginattempts.
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