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不同版本的linux系统的arp缓存数量不同,数量默认存放在/proc/sys/net/ipv4/neigh/default/gc_thresh3配置文件中,修改后,重启系统生效。

arp缓存数量不足,会导致很多问题,参见:深信服防火墙AF上arp表数量限制导致网络问题的处理说明。

关于更多的arp缓存说明,可以参考:https://vincent.bernat.ch/en/blog/2011-ipv4-route-cache-linux,https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk43772

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