1.修改配置文件對系統(tǒng)臨時生效，系統(tǒng)重啟后設(shè)置不起作用。

[root@208 ~]# echo? "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all

2.永久生效，修改系統(tǒng)的配置文件

[root@208 ~]# vim /etc/sysctl.conf

net.ipv4.icmp_echo_ignore_all = 1? ? ? ? ? --添加這一行

[root@208 ~]# sysctl? -p

net.ipv4.ip_forward = 0

net.ipv4.conf.default.rp_filter = 1

net.ipv4.conf.default.accept_source_route = 0

kernel.sysrq = 0

kernel.core_uses_pid = 1

net.ipv4.tcp_syncookies = 1

net.bridge.bridge-nf-call-ip6tables = 0

net.bridge.bridge-nf-call-iptables = 0

net.bridge.bridge-nf-call-arptables = 0

net.ipv4.icmp_echo_ignore_all = 1

net.ipv4.conf.all.arp_notify = 1

3.如果生效時有錯誤，錯誤處理

[root@208 ~]# sysctl? -p

net.ipv4.ip_forward = 0

net.ipv4.conf.default.rp_filter = 1

net.ipv4.conf.default.accept_source_route = 0

kernel.sysrq = 0

kernel.core_uses_pid = 1

net.ipv4.tcp_syncookies = 1

error: "net.bridge.bridge-nf-call-ip6tables" is an unknown key? ? --錯誤信息

error: "net.bridge.bridge-nf-call-iptables" is an unknown key

error: "net.bridge.bridge-nf-call-arptables" is an unknown key

net.ipv4.icmp_echo_ignore_all = 1

net.ipv4.conf.all.arp_notify = 1

解決方法:

[root@208 ~]# modprobe bridge

[root@208 ~]# lsmod | grep bridge

bridge? ? ? ? ? ? ? ? 83177? 0

stp? ? ? ? ? ? ? ? ? ? 2218? 1 bridge

llc? ? ? ? ? ? ? ? ? ? 5546? 2 bridge,stp

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