本文档介绍了如何在Linux系统中优化TCP/IP及内核参数，包括禁用IPv6、调整内存交换行为、设置ARP和RP过滤规则、优化TCP连接超时和保持活动等，以提升系统网络性能。
文件/etc/sysctl.conf
（修改后：sysctl -p生效）
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
vm.swappiness = 0
net.ipv4.neigh.default.gc_stale_time=120
# see details in https://help.aliyun.com/knowledge_detail/39428.html
net.ipv4.conf.all.rp_filter=0
net.ipv4.conf.default.rp_filter=0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_announce=2
net.ipv4.conf.all.arp_announce=2
# see details in https://help.aliyun.com/knowledge_detail/41334.html
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 1024
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_keepalive_time=30
net.ipv4.tcp_keepalive_intvl=2
net.ipv4.tcp_keepalive_probes=2
介绍参考：
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