We've gigabit networks, and large maximum transmission units (MTU) sizes (JumboFrames) can provide better network performance.
If you want to transfer large amounts of data at gigabit speeds, increasing the default MTU size can provide significant performance gains.
Whenever using multiple different networks its bandwidth should be consistent with the systems which are connected ,& It is mostly managed by router end.
MTU : the maximum transmission unit (MTU) of a communications protocol of a layer is the size (in bytes) of the largest protocol data unit that the layer can pass onwards. MTU parameters usually appear in association with a communications interface (NIC, serial port, etc.)
But Sometimes we are unable to make changes from router end but we need to send large data files which fails due to inconsistent bandwidth on 3 or multiple PPPoE networks.Problems might occur while sending data in Unix/Linux systems as its MTU (maximum transmission unit) default value is 1500.
1492 = Max for PPPoE (Point-to-Point Protocol over Ethernet)
1500 = Max for PPPoA (Point-to-Point Protocol over ATM )
way to change MTU manually if you are facing large packet drop :
To change the MTU size, use /sbin/ifconfig command as follows:
ifconfig ${Interface} mtu ${SIZE} up
ifconfig eth1 mtu 1492 up
Note: Its only if supported by both the network interface card and the network components such as switch.
Changing the MTU size permanently :
Edit /etc/sysconfig/network-scripts/ifcfg-eth0,
# vi /etc/sysconfig/network-scripts/ifcfg-eth0
Add MTU, :
MTU="1492"
Save and close the file. Restart networking:
# service network restart
Note for IPV6 set dedicated MTU as follows:
IPV6_MTU="1492"
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