➜ ~ ping www.33xn.cn
PING www.33xn.cn (47.95.232.103): 56 data bytes
64 bytes from 47.95.232.103: icmp_seq=0 ttl=250 time=27.105 ms
64 bytes from 47.95.232.103: icmp_seq=1 ttl=250 time=27.354 ms
64 bytes from 47.95.232.103: icmp_seq=2 ttl=250 time=26.348 ms
禁Ping
修改服务器
# /etc/sysctl.conf
# 尾部追加, 下边这行 forbiden ping 1, allow 0
net.ipv4.icmp_echo_ignore_all=0
# 保存，然后执行
sysctl -p
➜ ~ ping www.33xn.cn
PING www.33xn.cn (47.95.232.103): 56 data bytes
Request timeout for icmp_seq 0
