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My motherboard has 2 ethernet interfaces. On boot I encounter this error message which I guess is due to ZFSBootMenu boot method and does not seem to be problematic or related to my DHCP issue.

My motherboard has 2 ethernet interfaces.

Starting Nmap 7.93 ( https://nmap.org ) at 2025-09-17 13:58 CEST
Nmap scan report for laptop (192.168.1.16)    <--- this is my laptop: name is shown
Host is up (0.00095s latency).
Nmap scan report for 192.168.1.82             <--- this is my server: no name shown
Host is up (0.0026s latency).
Nmap scan report for _gateway (192.168.1.254) <--- this is my router
Host is marsup (0.0039s latency).
Nmap done: 256 IP addresses (3 hosts up) scanned in 2.93 seconds

Starting Nmap 7.93 ( https://nmap.org ) at 2025-09-17 13:58 CEST
Nmap scan report for laptop (192.168.1.16)    <--- this is my laptop: name is shown
Host is up (0.00095s latency).
Nmap scan report for 192.168.1.82             <--- this is my server: no name shown
Host is up (0.0026s latency).
Nmap scan report for _gateway (192.168.1.254) <--- this is my router / DHCP server
Host is marsup (0.0039s latency).
Nmap done: 256 IP addresses (3 hosts up) scanned in 2.93 seconds

extract from systemctl status:

extract from /etc/nsswitch.conf:

# hosts:          files mdns4_minimal [NOTFOUND=return] dns # stock Debian conf
hosts:          files myhostname mdns4_minimal [NOTFOUND=return] dns mdns4
netgroup:       nis

find /usr/lib -iname '*libnss*':

/usr/lib/x86_64-linux-gnu/libnss_mdns.so.2
/usr/lib/x86_64-linux-gnu/libnss_mdns6.so.2
/usr/lib/x86_64-linux-gnu/libnss_compat.so
/usr/lib/x86_64-linux-gnu/libnss_mdns_minimal.so.2
/usr/lib/x86_64-linux-gnu/libnss_files.so.2
/usr/lib/x86_64-linux-gnu/libnss_compat.so.2
/usr/lib/x86_64-linux-gnu/libnss_hesiod.so.2
/usr/lib/x86_64-linux-gnu/libnss_mdns4_minimal.so.2
/usr/lib/x86_64-linux-gnu/libnss_hesiod.so
/usr/lib/x86_64-linux-gnu/libnss_dns.so.2
/usr/lib/x86_64-linux-gnu/libnss_mdns6_minimal.so.2
/usr/lib/x86_64-linux-gnu/libnss_mdns4.so.2

extract from systemctl status:

dig -x 192.168.1.82 from my laptop:

; <<>> DiG 9.18.33-1~deb12u2-Debian <<>> 192.168.1.82
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 53842
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;192.168.1.82.          IN  A

;; AUTHORITY SECTION:
.           486 IN  SOA a.root-servers.net. nstld.verisign-grs.com. 2025091801 1800 900 604800 86400

;; Query time: 112 msec
;; SERVER: 127.0.0.53#53(127.0.0.53) (UDP)
;; WHEN: Thu Sep 18 21:07:31 CEST 2025
;; MSG SIZE  rcvd: 116