I got pointed to testing for good mtus

Dropping from 1500, these values give 0% packet loss

  ping  -M do -s 1472 -c 1 google.com
  ping6 -M do -s 1452 -c 1 google.com

anything higher, 100% loss.

I read too  MSS == MTU - 40 

So  for IPv4 MSS= 1432

Which I guess I set with

mssfix 1432

So what do I do with IPv6

It Needs MSS = 1412, if the calculation is the same for IPv6 as for IPv4.

I don't see any IPv6-specific 'mssfix' setting in the manpage.

- John

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