XEN Virtualization Set The MTU For xenbr0 Interface

last updated in Categories CentOS, Debian Linux, fedora linux, Gentoo Linux, High performance computing, kernel, Linux, Linux Virtualization, Networking, RedHat/Fedora Linux, xen

I’ve already written about setting the MTU (Maximum Transmission Unit) under Linux including Jumbo frames (FreeBSD specific MTU information is here).

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With this quick tip you can increase MTU size to get a better networking performance.

How do I setup MTU under XEN xenbr0 interface?

You can easily set MTU under XEN (xenbr0) using ifconfig or ip command as follows:
# /sbin/ifconfig xenbr0 mtu 1400
OR
# /sbin/ip link set dev xenbr0 mtu 1400
Replace 1400 with required MTU value such as 1500. You can display current mtu with ip command or by visting /sys/class/net/xenbr0/mtu file:
# cat /sys/class/net/xenbr0/mtu
or
# /sbin/ip link show xenbr0

Make changes permanent

Append following line to /etc/rc.local:
# vi /etc/rc.local
Add following line, type:
/sbin/ip link set dev xenbr0 mtu 1400
Save and close the file.

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Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.