Thank you so much, it works for me!
I had previously found such a message (
https://lists.nic.cz/hyperkitty/list/[email protected]/thread/T3NNHUKIOIKYEJZBFVDO73QP54XKUQ6I/#JZDC7WAYEL2GWQ6QBFUK5URLHWKR6NUT
), but I thought the option was related to the MS server, not Knot.
And now I understand - it's my mistake.

чт, 30 янв. 2025 г. в 19:13, Daniel Salzman <[email protected]>:

> Hi,
>
> Could you try enabling
> https://www.knot-dns.cz/docs/latest/singlehtml/index.html#no-edns ?
>
> Daniel
>
> On 1/30/25 17:01, Артём Палецкий wrote:
> > Hello!
> >
> > I have an issue.
> >
> > Knot is configured as a secondary server, and when receiving a zone, a
> "trailing data" error occurs, preventing the zone from being loaded from
> the primary server.
> >
> > ```
> > Jan 30 11:03:40 hostname knotd[5407]: info: [domain.com <
> http://domain.com>.] refresh, remote
> 50788646-db98-4caa-b26e-95b30a470796, address 1.2.3.4@53, failed
> (trailing data)
> > ```
> >
> > The same warning appears when using the `kdig` utility:
> >
> > ```bash
> > kdig @1.2.3.4 <http://1.2.3.4> domain.com <http://domain.com> AXFR >
> /tmp/domain.com <http://domain.com>
> > ;; WARNING: malformed reply packet (trailing data)
> > ;; WARNING: malformed reply packet (trailing data)
> > ```
> >
> > The issue occurs specifically with large zones. If the zone requires 2
> messages to be received (e.g., `Received 32720 B (2 messages, 442
> records)`), one warning appears. If it requires 3 messages (e.g., `Received
> 49083 B (3 messages, 878 records)`), two warnings appear.
> >
> > However, if I place this zone (`/tmp/domain.com <http://domain.com>`)
> into `/var/lib/knot` and then execute:
> >
> > ```bash
> > knotc reload
> > knotc zone-refresh domain.com <http://domain.com>
> > ```
> >
> > Knot successfully loads the zone.
> >
> > Unfortunately, due to confidentiality, I cannot share the contents of
> the zone. Additionally, I do not have precise information about the
> software installed on the primary server. However, if BIND is used as the
> secondary server, there are no issues. A regular `dig` command also does
> not return any errors.
> >
> > Is there any way to make Knot ignore the "trailing data" error and
> successfully load the zone?
> >
> > Thank you for your help!
> >
> > --
>
>
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