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Sending doesn't make sense

Today I learned…

While I’ve grown used to specifying as the listening address for servers, I got bitten yesterday and realized the dangers of this practice.

If the listening address of a server ever needs to be communicated to others (as is the case with clustered systems), configuring will lead to bad things happening. That is: other servers, having learned that your address is, will attempt to connect and fail.

The RFC states clearly:

This host on this network. MUST NOT be sent, except as a source address as part of an initializatioan procedure by which the host learns its own IP address.

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