Probably the reason its not on by default, is because it is
not a "fix",
its just a workaround, to work around braindead firewalls
that block all ICMP.
Agreed, it's a hack...but it's not only firewalls that drop ICMP...I came
across this a few years ago with a WAN router that was misbehaving between
Token Ring and Ethernet segments.
As such there would probably be considerable sacrifice
it has to operate - first of all there will have to be a few lost
retransmitions of large MTU packets before it realises
something is wrong,
and then (from Juha's post) it just drops the MTU to 536 for further
communication, which is definately sub optimal, depending on
what the real
maximum MTU of the path is...
Yes, although it will only kick in on these sites that have this problem.
It's dynamic on a per connection basis.
Overall performance on the majority of connections won't be affected, as the
'ol TCP stack will behave as intended.
If it was on by default, it would hide the real
ever get done about it.
Fixing is always better than working around, but given that ICMP access
policy at the far end of the pipe is not something that Joe User usually has
a lot of control over, then something that will work is probably better than
something that doesn't. (From a user perspective)
Unless it has some other negative impact....
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