>> Rather than guess and take random values read on the net - measure it.
>> Google calculate mtu - netgear and others show ways to test upstream to
>> get the ideal size using ping
>> You are looking for the largest MTU value before fragmentation starts to
>> occur.
>   See https://www.dslreports.com/faq/695 for detailed instructions on
> getting the maximum MTU for your setup.

I followed the instructions and got this at first:

# ping -s 1472 www.dslreports.com
PING www.dslreports.com ( 1472(1500) bytes of data.
>From dsldevice ( icmp_seq=1 Frag needed and DF set (mtu = 1492)
1480 bytes from www.dslreports.com ( icmp_seq=2 ttl=54
time=93.9 ms

After that it wouldn't tell me "Frag needed" no matter how high I set
the MTU for the ping command, but maybe the above indicates that my
max MTU is 1492?

- Grant

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