"CentOS" Ping sysctl.conf

View Settings

[Email protected] etc]# Cat/proc/sys/net/ipv4/icmp_echo_ignore_all

0

Test

huangchao-macbookpro:~ hchao$ Ping a.b.c.d

PING a.b.c.d (a.b.c.d): Data bytes

Bytes from a.b.c.d: icmp_seq=0 ttl=55 time=6.690 ms

Bytes from a.b.c.d: icmp_seq=1 ttl=55 time=5.536 ms

Bytes from a.b.c.d: icmp_seq=2 ttl=55 time=23.421 ms

Bytes from a.b.c.d: icmp_seq=3 ttl=55 time=8.740 ms

^c

--- a.b.c.d ping Statistics---

4 packets transmitted, 4 packets received, 0.0% packet loss

Round-trip Min/avg/max/stddev = 5.536/11.097/23.421/7.207 ms

huangchao-macbookpro:~ hchao$

Modify Configuration

[Email protected] etc]# vi/etc/sysctl.conf

[Email protected] etc]#

# System default Settings Live in/usr/lib/sysctl.d/00-system.conf.

# to override those settings, enter new settings here, or in an/etc/sysctl.d/<name>.conf file

# Disable Ping

Net.ipv4.icmp_echo_ignore_all=1

# For more information, see sysctl.conf (5) and SYSCTL.D (5).

Effect

[Email protected] etc]# sysctl-p

Net.ipv4.icmp_echo_ignore_all = 1

[Email protected] etc]#

Test

huangchao-macbookpro:~ hchao$ Ping a.b.c.d

PING a.b.c.d (a.b.c.d): Data bytes

Request Timeout for icmp_seq 0

Request Timeout for icmp_seq 1

Request Timeout for icmp_seq 2

Request Timeout for icmp_seq 3

Request Timeout for icmp_seq 4

Request Timeout for icmp_seq 5

Request Timeout for icmp_seq 6

Request Timeout for icmp_seq 7

Request Timeout for icmp_seq 8

^c

--- a.b.c.d ping Statistics---

Packets transmitted, 0 packets received, 100.0% packet loss

huangchao-macbookpro:~ hchao$

This article is from the "Huang Chao It Notes" blog, so be sure to keep this source http://huangchao.blog.51cto.com/10446378/1680794

"CentOS" Ping sysctl.conf