Ubuntu关闭Ipv6

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查看端口：
donald_draper@rain:~$ netstat -ntlp
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.1.1:53            0.0.0.0:*               LISTEN      -              
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      -              
tcp6       0      0 ::1:631                 :::*                    LISTEN      -
查看ipv6状态：
#显示0说明ipv6开启，1说明关闭
donald_draper@rain:~$ cat /proc/sys/net/ipv6/conf/all/disable_ipv6
0
在 /etc/sysctl.conf 增加下面几行
#disable IPv6
donald_draper@rain:~$ sudo vim  /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
donald_draper@rain:~$ tail -n 3 /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

将文件中的  GRUB_CMDLINE_LINUX_DEFAULT="quiet spalsh"  修改为
GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 quiet splash"
donald_draper@rain:~$  sudo vim  /etc/default/grub
donald_draper@rain:~$ cat /etc/default/grub
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 quiet splash"
GRUB_CMDLINE_LINUX=""

运行sudo update-grub更新
donald_draper@rain:~$ sudo update-grub
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-4.2.0-16-generic
Found initrd image: /boot/initrd.img-4.2.0-16-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
重启网络服务，禁用ipv6成功
donald_draper@rain:~$ netstat -ntup
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.0.1:47154         127.0.0.1:631           ESTABLISHED -              
tcp        0      0 127.0.0.1:47156         127.0.0.1:631           ESTABLISHED -              
tcp        0      0 127.0.0.1:631           127.0.0.1:47156         ESTABLISHED -              
tcp        0      0 127.0.0.1:631           127.0.0.1:47154         ESTABLISHED -              
donald_draper@rain:~$ ifconfig
eno16777736 Link encap:Ethernet  HWaddr 00:0c:29:39:44:61 
          inet addr:192.168.126.135  Bcast:192.168.126.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:104 errors:0 dropped:0 overruns:0 frame:0
          TX packets:48 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:8278 (8.2 KB)  TX bytes:5534 (5.5 KB)

lo        Link encap:Local Loopback 
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:213 errors:0 dropped:0 overruns:0 frame:0
          TX packets:213 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:18820 (18.8 KB)  TX bytes:18820 (18.8 KB)


关于SSH IP6关闭，参见：
https://www.jb51.net/LINUXjishu/335724.html

还有一个cups的打印服务关闭：
参见：
https://unix.stackexchange.com/questions/177458/remove-cupsd-completly