Difference between revisions of "MTU"
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| − | [[Cisco IOS]]: <code>[[show system]] mtu</code> | + | [[wikipedia:Maximum transmission unit]] (MTU) |
| + | |||
| + | * [[Cisco IOS]]: <code>[[show system]] mtu</code> | ||
Change configuration on Linux: | Change configuration on Linux: | ||
| − | + | ||
| + | <code>[[ip link]] set dev eth0 [[mtu]] 9000</code> ([[Jumbo frames]]) | ||
| + | |||
| + | <code>ifconfig -a | grep mtu</code> | ||
ifconfig -a | grep mtu | ifconfig -a | grep mtu | ||
| + | eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 9001 | ||
| + | <code>[[ping -M]] do -s 9000 <some_ip_address></code> | ||
| − | |||
Select Path MTU Discovery strategy. hint may be either do (prohibit fragmentation, even local one), want (do PMTU discovery, fragment locally when packet size is large), or don't (do not set DF flag). | Select Path MTU Discovery strategy. hint may be either do (prohibit fragmentation, even local one), want (do PMTU discovery, fragment locally when packet size is large), or don't (do not set DF flag). | ||
| − | + | <code>[[netsh]] interface ipv4 show interfaces</code> | |
== Related terms == | == Related terms == | ||
| Line 18: | Line 24: | ||
* debug1: expecting SSH2_MSG_KEX_ECDH_REPLY | * debug1: expecting SSH2_MSG_KEX_ECDH_REPLY | ||
* [[Path MTU Discovery (PMTUD)]] | * [[Path MTU Discovery (PMTUD)]] | ||
| − | * [[sysctl]]: <code>net.ipv4.tcp_mtu_probing</code> | + | * [[sysctl]]: <code>[[net.ipv4]].tcp_mtu_probing</code> |
* [[WireGuard]]: https://wiki.archlinux.org/index.php/WireGuard#Low_MTU | * [[WireGuard]]: https://wiki.archlinux.org/index.php/WireGuard#Low_MTU | ||
| + | * <code>[[iperf]]: -M, --mss</code> | ||
| + | * <code>[[tun-mtu]]</code> in <code>[[/etc/openvpn/server.conf]]</code> | ||
| + | * [[kubernetes.io/rule/nlb/mtu]] | ||
== See also == | == See also == | ||
Latest revision as of 14:25, 26 October 2023
wikipedia:Maximum transmission unit (MTU)
- Cisco IOS:
show system mtu
Change configuration on Linux:
ip link set dev eth0 mtu 9000 (Jumbo frames)
ifconfig -a | grep mtu
ifconfig -a | grep mtu eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 9001
ping -M do -s 9000 <some_ip_address>
Select Path MTU Discovery strategy. hint may be either do (prohibit fragmentation, even local one), want (do PMTU discovery, fragment locally when packet size is large), or don't (do not set DF flag).
netsh interface ipv4 show interfaces
Related terms[edit]
- Jumbo frames
- debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
- Path MTU Discovery (PMTUD)
- sysctl:
net.ipv4.tcp_mtu_probing - WireGuard: https://wiki.archlinux.org/index.php/WireGuard#Low_MTU
iperf: -M, --msstun-mtuin/etc/openvpn/server.conf- kubernetes.io/rule/nlb/mtu
See also[edit]
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