Mattias Pantzare wrote:
On Wed, Jul 8, 2009 at 19:06, Carson Gaspar<[email protected]> wrote:
Sean O'Malley wrote:
-icmp shouldn't be used. Some BOFH block/drop icmp.
...
-is there a standard way to do UDP mtu link detection on any platform
already?
The standard is ICMP WOULD FRAGMENT. People who block that don't deserve
functional apps. Don't cater to them.
The end user seldom have control over all firewalls...
There are two goos solutions to this problem, one is to start using
TCP for AFS as these problems are solved in good TCP implementations.
The other solution is to look at how a good TCP implementation handles
path mtu discovery, including black hole detection (when the wold
fragment icmp packets are dropped) and copy that.
While I pity users of broken networks, any effort expended beyond "turn off PMTU
discovery" to work around intentionally broken networks is completely wasted.
And I'd argue that even _that_ is a bad idea that just enables stupid people to
break their networks.
--
Carson
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