如何永久更改MTU设置
问题描述:
我需要将MTU
永久更改为1500
。永久性我的意思是如果我重新启动系统或将执行service network restart
它将一直是1500
。如何永久更改MTU设置
我跟着这篇文章http://www.cyberciti.biz/faq/centos-rhel-redhat-fedora-debian-linux-mtu-size/
但不幸的是它好好尝试为我工作。
这里是我做过什么:
检查当前MTU
:
eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc pfifo_fast state UP qlen 1000
新增MTU="1500"
到/etc/sysconfig/network-scripts/ifcfg-eth0
:
[[email protected]~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
TYPE=Ethernet
USERCTL=yes
PEERDNS=yes
IPV6INIT=no
PERSISTENT_DHCLIENT=yes
IPV6_MTU="1500"
MTU="1500"
然后再次检查MTU
,(没有运气):
[email protected] ~]# service network restart
Shutting down interface eth0: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0:
Determining IP information for eth0... done.
[ OK ]
[[email protected] ~]# ip addr show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc pfifo_fast state UP qlen 1000
/sbin/ifconfig
改变MTU
但只有时间
[[email protected] ~]# /sbin/ifconfig eth0 mtu 1500 up
[[email protected] ~]# ip addr show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
如果我重新启动network
再次是9001:
[[email protected] ~]# service network restart
Shutting down interface eth0: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0:
Determining IP information for eth0... done.
[ OK ]
[[email protected] ~]# ip addr show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc pfifo_fast state UP qlen 1000
答
的MTU在您的环境正在通过DHCP自动设置,在配置你有此设置:
DEVICE=eth0
BOOTPROTO=dhcp
所以DHCP实际上是设置MTU的大小。在Ubuntu中,您可以编辑以下文件:/etc/dhcp/dhclient.conf
之前设定的请求线这两条命令:
default interface-mtu 1500;
supercede interface-mtu 1500;
我不知道如何设置它在红帽子,但我认为该文件被称为dhcpd.conf
希望这有助于!