MUT值设置、top等命令无法执行、ssh无法登陆、vim命令卡住

[root@host-10-1-1-204 ~]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.1.1.204  netmask 255.255.255.0  broadcast 10.1.1.255
        inet6 fe80::f816:3eff:fe76:c1c1  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:76:c1:c1  txqueuelen 1000  (Ethernet)
        RX packets 2144706  bytes 9907368626 (9.2 GiB)
        RX errors 0  dropped 2  overruns 0  frame 0
        TX packets 2648576  bytes 200369501 (191.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Local Loopback)
        RX packets 22  bytes 4582 (4.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 22  bytes 4582 (4.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


[root@host-10-1-1-68 ~]# cat /sys/class/net/eth0/mtu 
1500


[root@host-10-1-1-204 ~]# echo 1450 > /sys/class/net/eth0/mtu

[root@host-10-1-1-68 ~]# cat /sys/class/net/eth0/mtu 
1450





top等命令无法执行、ssh无法登陆


现象：


笔记本mut值大于路由的mtu值问题：


解决办法：

[root@host-10-1-1-204 ~]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.1.1.204  netmask 255.255.255.0  broadcast 10.1.1.255
        inet6 fe80::f816:3eff:fe76:c1c1  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:76:c1:c1  txqueuelen 1000  (Ethernet)
        RX packets 2144706  bytes 9907368626 (9.2 GiB)
        RX errors 0  dropped 2  overruns 0  frame 0
        TX packets 2648576  bytes 200369501 (191.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Local Loopback)
        RX packets 22  bytes 4582 (4.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 22  bytes 4582 (4.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


[root@host-10-1-1-68 ~]# cat /sys/class/net/eth0/mtu 
1500


[root@host-10-1-1-204 ~]# echo 1450 > /sys/class/net/eth0/mtu

[root@host-10-1-1-68 ~]# cat /sys/class/net/eth0/mtu 
1450




云主机vi命令卡住



云主机vi命令卡住

笔记本mut值大于路由的mtu值问题：


解决办法：

[root@host-10-1-1-204 ~]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.1.1.204  netmask 255.255.255.0  broadcast 10.1.1.255
        inet6 fe80::f816:3eff:fe76:c1c1  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:76:c1:c1  txqueuelen 1000  (Ethernet)
        RX packets 2144706  bytes 9907368626 (9.2 GiB)
        RX errors 0  dropped 2  overruns 0  frame 0
        TX packets 2648576  bytes 200369501 (191.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Local Loopback)
        RX packets 22  bytes 4582 (4.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 22  bytes 4582 (4.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


[root@host-10-1-1-68 ~]# cat /sys/class/net/eth0/mtu 
1500


[root@host-10-1-1-204 ~]# echo 1450 > /sys/class/net/eth0/mtu

[root@host-10-1-1-68 ~]# cat /sys/class/net/eth0/mtu 
1450