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Bug #4397
closed
CB
CB
MTU must be set in same ifconfig command as IP
Bug #4397:
MTU must be set in same ifconfig command as IP
Start date:
02/09/2015
Due date:
% Done:
100%
Estimated time:
Plus Target Version:
Release Notes:
Affected Version:
All
Affected Architecture:
Description
Where MTU on an interface is user-defined, the ifconfig command that assigns the IP and IPv6 addresses must include the MTU. For instance, this:
ifconfig vmx1 mtu 9000 ifconfig vmx1 inet 192.168.1.1 netmask 255.255.255.0
You'll end up with the NIC at MTU 9000, but the link route for 192.168.1.0/24 will be 1500. Doesn't matter if the MTU is set before or after the IP, this is the case.
If you instead run:
ifconfig vmx1 inet 192.168.1.1 netmask 255.255.255.0 mtu 9000
Then both the interface and the link route have the correct MTU. This affects IPv6 the same way, with the same resolution.
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