How to choose right for the WAN Interface MTU size?

Hello

I would like to know How to determine the right size MTU to set in the properties of the WAN interface (in my case, NSA appliances).

First of all. I noticed that with SonicOS Enhanced 5.9.x, there is a Tool of diagnosis called PMTU discovery:

This tool is not available with SonicOS Enhanced 5.8.x.

I guess using this built-in tool is a way to determine the right MTU size to apply.

Second, for SonicOS versions that do not have this tool and to understand just how to manually determine the size MTU, I would like to know what is the method to follow.

On the Internet, I found this method by using the ping-f-l command. Once you have determined the largest possible packet size, it ask you to Add 28 to that number and you get the MTU size to define the interface.

Case study:

In my business, there are 2 sites: 1 in China and 1 in South Korea. Both have a firewall SonicWALL NSA.

To determine the MTU size that is applicable from the Chinese site, I get the same results with the 2 methods mentioned above.

With the help of the PMTU discovery:

I get 2 IPs: 8.8.8.8 and the Korean FW IP WAN. I get the same result: 1500.

However, I noticed that the MTU size should be set to its maximum (1500) of size on the properties of the interface WAN for this test to work properly. Indeed, when I put in 1404 to test, PMTU discovery find 1404 such as MTU size:

With the help of ping - f - l:

When you use the ping with FW Korea WAN IP method, I found 1472 as the maximum packet size:

According to the method I've read on the Internet, adding 28 will make me a MTU of 1500, same size as the PMTU discovery method.

My question is: can you confirm that these 2 methods are correct determine the MTU size to set the WAN interface? Especially the one with the ping command? If not, how do?

Thanks in advance for your comments.

I can tell you that as technicians, we use the way to CMD line to adjust the MTU on WAN interfaces. We saw this as a number to work with.

Thank you
Ben D
#Iwork4Dell

Tags: Dell Tech

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