We are currently moving from z/VM 5.3 to z/VM 5.4. We are wondering what
to do with TCPIP and
the new PATHMTU and PATHMTUAGE . Currently we have left it out so it is
disabled and apparently
defaults to Path MTU Discovery Aging Interval of 10 minutes (per NETSTAT
GATE). In looking at the
TCPIP
of which are external network providers in our case), AND
that firewalls had to allow the ICMP traffic through. There is also a
rumor floating around that PATHMTU results in the do not fragment' bit
always being set on. Which seems very scary and wrong.
From
, this makes the algorithm faster and more accurate, but it is not a
requirement. If we never receive the ICMP packet, the stack will
eventually adjust the MTU as above.
There is also a rumor floating around that PATHMTU
results in the “do not fragment’ bit always being set on. Which
seems very scary
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|Re: PATHMTU
a rumor floating around that PATHMTU results in the do not
fragment' bit always being set on. Which seems very scary and wrong.
That was true of a buggy release of the Windows TCP stack a long while ago.
That's been fixed mostly, but since most people use Ethernet inside their
network
