<ubuntu ping响应慢 延迟严重的解决>

1. ip配置问题；
2. dns解析问题；
3. 网线问题；

# /etc/nsswitch.conf
#
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc-reference‘ and `info‘ packages installed, try:
# `info libc "Name Service Switch"‘ for information about this file.

passwd:         compat
group:          compat
shadow:         compat

#hosts:          files mdns4_minimal [NOTFOUND=return] dns mdns4   //注释掉此行
hosts:          files dns        //添加下面这行
networks:       files

protocols:      db files
services:       db files
ethers:         db files
rpc:            db files

netgroup:       nis
~