Debian 9/Ubuntu 18.04 关ipv6和改mtu

Debian 9

nano /etc/sysctl.d/99-sysctl.conf

底部增加

net.ipv6.conf.all.disable_ipv6 = 1

net.ipv6.conf.default.disable_ipv6 = 1

net.ipv6.conf.lo.disable_ipv6 = 1

然后sudo sysctl -p

改MTU

nano /etc/network/interfaces

添加一行红字，如下：

iface eth2 inet static

    address 10.123.16.197

    netmask 255.255.255.0

    network 10.123.16.0

    mtu 1480

================================================

检测最大mtu

例如输入

ping -l 1453 -f www.baidu.com

提示拆包

输入

ping -l 1452 -f www.baidu.com

则正常

1452+28=1480

1480则是要输入到wan口的mtu数值

apt install sudo -y 

nano /etc/sysctl.conf

# IPv6 disabled

net.ipv6.conf.all.disable_ipv6 = 1

net.ipv6.conf.default.disable_ipv6 = 1

net.ipv6.conf.lo.disable_ipv6 = 1

nano /etc/rc.local

增加

sudo sysctl -p

sudo ifconfig eth0 mtu 1480