That's correct. Since BIND 9.16, `named` binds to individual addresses instead of "any" because it needs to send responses back from the same address and it's just easier this way.
Cheers, -- Ondřej Surý (He/Him) ond...@isc.org My working hours and your working hours may be different. Please do not feel obligated to reply outside your normal working hours. > On 8. 7. 2024, at 10:52, Thomas Hungenberg via bind-users > <bind-users@lists.isc.org> wrote: > > Hello, > > we have been running some BIND nameservers on Debian-based systems for many > years. > > Until (including) Debian 10 with BIND 9.11.5, netstat always showed only one > line > per listening socket, e.g. > > tcp 0 0 10.x.x.x:53 0.0.0.0:* LISTEN > 1234/named > tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN > 1234/named > udp 0 0 10.x.x.x:53 0.0.0.0:* > 1234/named > udp 0 0 127.0.0.1:53 0.0.0.0:* > 1234/named > > > We noticed that with Debian 11 and 12 (BIND 9.16.48 / 9.18.24), netstat > instead > shows multiple (on some systems four, on others up to 20) completely > identical lines > for each listening socket, like this: > > tcp 0 0 10.x.x.x:53 0.0.0.0:* LISTEN > 1234/named > tcp 0 0 10.x.x.x:53 0.0.0.0:* LISTEN > 1234/named > tcp 0 0 10.x.x.x:53 0.0.0.0:* LISTEN > 1234/named > tcp 0 0 10.x.x.x:53 0.0.0.0:* LISTEN > 1234/named > tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN > 1234/named > tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN > 1234/named > tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN > 1234/named > tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN > 1234/named > udp 0 0 10.x.x.x:53 0.0.0.0:* > 1234/named > udp 0 0 10.x.x.x:53 0.0.0.0:* > 1234/named > udp 0 0 10.x.x.x:53 0.0.0.0:* > 1234/named > udp 0 0 10.x.x.x:53 0.0.0.0:* > 1234/named > udp 0 0 127.0.0.1:53 0.0.0.0:* > 1234/named > udp 0 0 127.0.0.1:53 0.0.0.0:* > 1234/named > udp 0 0 127.0.0.1:53 0.0.0.0:* > 1234/named > udp 0 0 127.0.0.1:53 0.0.0.0:* > 1234/named > > > We wonder what is causing this and if this is intended behaviour? > > > - Thomas >  > -- > Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from > this list > > ISC funds the development of this software with paid support subscriptions. > Contact us at https://www.isc.org/contact/ for more information. > > > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users -- Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
