DNS noise

Jared Mauch jared at puck.nether.net
Fri Apr 6 15:49:48 CDT 2012

On Apr 6, 2012, at 4:44 PM, David Conrad wrote:

> However, I would be interested in hearing what the excuses are for folks not implementing BCP38 these days.


1) hardare support varies
2) implementing bcp-38 drives customer support costs up in cases where the customer is doing something weird "e.g.: using toms isdn-dial backup to source return packets".
3) customers can't be trusted to give a complete list of valid source addresses
4) asymmetric or highly kinky routing exists more than one would like to admit

There are cases where it's fairly inexcusable:
Fixed broadband providers (static IP address or dynamic to a customer port/pool)
CGN exit points
Static routed customers (They shouldn't be doing asymmetric routing)

The real reason imho.. is #2 above.  desire to keep unnecessary support calls from your call center.

- Jared

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