Subject: Re: ACK packets?

From: John Goerzen <[email-masked]>
Date: Sat, 13 Dec 2025 17:11:57 -0600

Hi Hadmut,

ACK packets are most useful when used with nncp-xfer and such.  You
could also use them if you think that, for instance, machine B in your
example is not entirely reliable.

I have an article at

https://www.complete.org/dead-usb-drives-are-fine-building-a-reliable-sneakernet/

that may explain it more for you.

- John

On Sun, Dec 14 2025, Hadmut Danisch wrote:

> Hi,
>
>
> when sending A->B->C, then C can send ACKs back C->B->A.
>
> But what exactly do these ACKs on A then?
>
>
> http://www.nncpgo.org/ACK.html is not really talkative about that and explains,
> that one can send ACKs, but only nncp-xfer seems to support -keep, and the
> explanation suggests that these ACKs are used for manual administration.
>
>
>
> I would have thought that regular messages generated from nncp-file or nncp-exec
> are kept after sending, until ACKed, and resent if not ACKed withon reasonable
> (=configurable) time.
>
>
> regards
>
> Hadmut