Did you check this :
Also when you say it is not working , whats happening , are you getting any error ? if yes post the error
The link you refer to is not for the VCSA.
In reply to your question: Once the instructions are followed to set the Service and VCSA is rebooted, I check the MTU setting using
ip ad | grep mtu
networkctl status eth0
This returns the current set MTU (which in my case is the old one and incorrect).
I'm just curious here, but for what purpose would you want to change the MTU of the vCSA?
For example, If I wanted to enable jumbo frames, I would enable across my physical network, ESXi, vSwitches and VM guest OS's....correct?
Not necessarily. You only need to enable jumbo frames on devices and systems where that makes a difference, but keep in mind that just because you set jumbo frames on your networking infrastructure does *not* mean that devices cannot continue to send smaller packet sizes. They can and will. So you really don't gain anything by trying to increase the MTU on vCSA. It can continue to work just fine even on a jumbo frames network.
Thanks daphnissov. Understand, but If you I wanted to decrease the MTU (which is common for a VPN) how is that achieved?
Default MTU is 1500. Decreasing an MTU from there probably isn't the best idea as that is a very common transmission size. Again, however, from vCSA's perspective, you're not gaining anything by changing this value as it isn't likely to transmit enough larger packets to "do" anything.