openEuler环境下修改网卡MTU值

原创 Nightingale 2023-02-04

2343

打算在openEuler上安装openGauss，在环境准备阶段遇到了修改MTU值的需求，特此记录。

什么是MTU？为什么MTU值普遍都是1500？-阿里云开发者社区 (aliyun.com)

方式1.

通过/sys/class/net/ens32/mtu 查询、修改MTU

[root@localhost ~]# echo "8192" > /sys/class/net/ens32/mtu

[root@localhost ~]#

[root@localhost ~]# cat /sys/class/net/ens32/mtu

8192

[root@localhost ~]#

方式2

安装ifconfig

ifconfig命令是设置或显示网络接口的程序，可以显示出我们机器的网卡信息，网络相关的命令都在net-tools下，只要安装net-tools即可。
openEuler默认没有安装net-tools，不能使用ifconfig查看网络配置，需要单独安装。

[root@localhost ~]# yum search ifconfig

Last metadata expiration check: 1:03:26 ago on Fri 03 Feb 2023 11:04:22 AM CST.

=========================================================================== Summary Matched: ifconfig ===========================================================================

python-ifcfg.src : Python Ifconfig Wrapper for Unix/Linux/MacOSX

python3-ifcfg.noarch : Python Ifconfig Wrapper for Unix/Linux/MacOSX

[root@localhost ~]#

[root@localhost ~]#

[root@localhost ~]# yum -y install ifconfig

Last metadata expiration check: 1:04:07 ago on Fri 03 Feb 2023 11:04:22 AM CST.

No match for argument: ifconfig

Error: Unable to find a match: ifconfig

[root@localhost ~]#

[root@localhost ~]# yum install net-tools.x86_64

Last metadata expiration check: 1:04:51 ago on Fri 03 Feb 2023 11:04:22 AM CST.

Dependencies resolved.

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

Package Architecture Version Repository Size

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

Installing:

net-tools x86_64 2.10-3.oe2203 update 200 k

Transaction Summary

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

Install 1 Package

Total download size: 200 k

Installed size: 881 k

Is this ok [y/N]: y

Downloading Packages:

net-tools-2.10-3.oe2203.x86_64.rpm 378 kB/s | 200 kB 00:00

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Total 371 kB/s | 200 kB 00:00

retrieving repo key for update unencrypted from http://repo.openeuler.org/openEuler-22.03-LTS/OS/x86_64/RPM-GPG-KEY-openEuler

update 12 kB/s | 2.1 kB 00:00

Importing GPG key 0xB25E7F66:

Userid : "private OBS (key without passphrase) "

Fingerprint: 12EA 74AC 9DF4 8D46 C69C A0BE D557 065E B25E 7F66

From : http://repo.openeuler.org/openEuler-22.03-LTS/OS/x86_64/RPM-GPG-KEY-openEuler

Is this ok [y/N]: y

Key imported successfully

Running transaction check

Transaction check succeeded.

Running transaction test

Transaction test succeeded.

Running transaction

Preparing : 1/1

Installing : net-tools-2.10-3.oe2203.x86_64 1/1

Running scriptlet: net-tools-2.10-3.oe2203.x86_64 1/1

Verifying : net-tools-2.10-3.oe2203.x86_64 1/1

Installed:

net-tools-2.10-3.oe2203.x86_64

Complete!

[root@localhost ~]#

通过ifconfig查看mtu

[root@localhost ~]# ifconfig

ens32: flags=4163 mtu 8192

inet 192.168.43.89 netmask 255.255.255.0 broadcast 192.168.43.255

inet6 2408:845c:a300:2b10:914c:f5c7:45b7:afea prefixlen 64 scopeid 0x0

inet6 fe80::7ae:a8ea:8499:8f19 prefixlen 64 scopeid 0x20

ether 00:0c:29:68:19:af txqueuelen 1000 (Ethernet)

RX packets 56654 bytes 67010456 (63.9 MiB)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 30647 bytes 2352315 (2.2 MiB)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73 mtu 65536

inet 127.0.0.1 netmask 255.0.0.0

inet6 ::1 prefixlen 128 scopeid 0x10

loop txqueuelen 1000 (Local Loopback)

RX packets 0 bytes 0 (0.0 B)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 0 bytes 0 (0.0 B)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

[root@localhost ~]#

通过ifconfig修改mtu

[root@localhost ~]# ifconfig ens32 mtu 9000 up

[root@localhost ~]#

[root@localhost ~]# ifconfig

ens32: flags=4163 mtu 9000

inet 192.168.43.89 netmask 255.255.255.0 broadcast 192.168.43.255

inet6 2408:845c:a300:2b10:914c:f5c7:45b7:afea prefixlen 64 scopeid 0x0

inet6 fe80::7ae:a8ea:8499:8f19 prefixlen 64 scopeid 0x20

ether 00:0c:29:68:19:af txqueuelen 1000 (Ethernet)

RX packets 57814 bytes 67115923 (64.0 MiB)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 31560 bytes 2439367 (2.3 MiB)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73 mtu 65536

inet 127.0.0.1 netmask 255.0.0.0

inet6 ::1 prefixlen 128 scopeid 0x10

loop txqueuelen 1000 (Local Loopback)

RX packets 0 bytes 0 (0.0 B)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 0 bytes 0 (0.0 B)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

[root@localhost ~]#

方式3.

通过/etc/sysconfig/network-scripts/ifconig-eth0 查询、修改MTU.

通过ifconfig-eth0修改MTU

[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-ens32

[root@localhost ~]#

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens32 | grep MTU

MTU=8192

[root@localhost ~]#

重启网络服务

openEuler使用NetworkManager工具管理网络，没有network服务。

[root@localhost ~]# systemctl restart network

Failed to restart network.service: Unit network.service not found.

[root@localhost ~]#


[root@localhost ~]# systemctl restart NetworkManager

[root@localhost ~]#

[root@localhost ~]# ifconfig

ens32: flags=4163 mtu 8192

inet 192.168.43.89 netmask 255.255.255.0 broadcast 192.168.43.255

inet6 2408:845c:a300:2b10:914c:f5c7:45b7:afea prefixlen 64 scopeid 0x0

inet6 fe80::7ae:a8ea:8499:8f19 prefixlen 64 scopeid 0x20

ether 00:0c:29:68:19:af txqueuelen 1000 (Ethernet)

RX packets 58666 bytes 67195104 (64.0 MiB)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 32273 bytes 2517947 (2.4 MiB)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73 mtu 65536

inet 127.0.0.1 netmask 255.0.0.0

inet6 ::1 prefixlen 128 scopeid 0x10

loop txqueuelen 1000 (Local Loopback)

RX packets 0 bytes 0 (0.0 B)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 0 bytes 0 (0.0 B)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

[root@localhost ~]#

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