The general statement is in RFC 1958:
> 3.9 Be strict when sending and tolerant when receiving.
> Implementations must follow specifications precisely when sending to
> the network, and tolerate faulty input from the network. When in
> doubt, discard faulty input silently, without returning an error
> message unless this is required by the specification.
Brian
Matt Crawford wrote:
>
> > I might be totally wrong in this but I see that there are two
> > contradicting statements in RFC1883 for IPv6. Can somebody please explain
>
> The apparent discrepancy is reconciled by the robustness principle.
>
> 2.10. Robustness Principle
>
> TCP implementations will follow a general principle of robustness: be
> conservative in what you do, be liberal in what you accept from
> others.
>
> This applies not only to TCP - see RFC 1812.
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