On 6to4 gateway and recommended MTU setting

Brian E Carpenter brian.e.carpenter at gmail.com
Thu Mar 11 21:20:14 CET 2010

On 2010-03-12 02:05, holger.zuleger at vodafone.com wrote:
>> The better question is actually: why bother with 6to4?
>> Yes, it is a nice quick deployment strategy, but for anything long term,
>> go native... (or at least native addresses using 6rd or something).
> But with 6rd you will end up in the same discussion.

6to4 and 6rd are *both* transitional solutions that will die in due time.

Since we have plenty of running code experience that they work well with
1280 and sometimes hit PMTUD failures with 1480, any operator who wants to
avoid unwanted phone calls will use 1280. Time enough to worry about an
optimal value when you go native.

By the way, we didn't know enough when RFC3056 was written to suggest a
default, and we were too optimistic about PMTUD, so it didn't seem to matter.


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