Error muncul ketika update di repository ubuntu. Setelah saya cari tau kendala dari masalah ini adalah repository winehq belum terdapat public key. Dokumentasi kendala yang muncul sebagai berikut.

rzna@jmdslmt:~$ sudo apt-get update
Err:6 https://dl.winehq.org/wine-builds/ubuntu mantic InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 76F1A20FF987672F            
Reading package lists... Done                                                                                
W: GPG error: https://dl.winehq.org/wine-builds/ubuntu mantic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 76F1A20FF987672F
E: The repository 'https://dl.winehq.org/wine-builds/ubuntu mantic InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Setelah beberapa kali saya cari dokumentasi di forum saya menemukan beberapa solusi. Berikut solusi yang mungkin bisa menyelesaikan masalah.

Download key online. Cara ini saya dapatkan dari referensi berikut: https://github.com/cli/cli/discussions/6222
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 76F1A20FF987672F

Setelah saya coba command diatas muncul masalah bahwa ternyata key yang di download sudah ada.

rzna@jmdslmt:~$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 76F1A20FF987672F
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
Executing: /tmp/apt-key-gpghome.syUR5Sc8Uh/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys 76F1A20FF987672F
gpg: key 76F1A20FF987672F: public key "WineHQ packages <wine-devel@winehq.org>" imported
gpg: Total number processed: 1
gpg:               imported: 1

Nah, karena sudah terdaftar kita perlu melihat lokasi key nya. Perintah berikut digunakan untuk menampilkan key yang sudah terdaftar.
rzna@jmdslmt:~$ sudo apt-key list
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
/etc/apt/trusted.gpg
--------------------
pub   rsa3072 2018-12-10 [SC]
      D43F 6401 4536 9C51 D786  DDEA 76F1 A20F F987 672F
uid           [ unknown] WineHQ packages <wine-devel@winehq.org>
sub   rsa3072 2018-12-10 [E]

/etc/apt/trusted.gpg.d/google-chrome.gpg
----------------------------------------
pub   rsa4096 2016-04-12 [SC]
      EB4C 1BFD 4F04 2F6D DDCC  EC91 7721 F63B D38B 4796
uid           [ unknown] Google Inc. (Linux Packages Signing Authority) <linux-packages-keymaster@google.com>
sub   rsa4096 2023-02-15 [S] [expires: 2026-02-14]
sub   rsa4096 2024-01-30 [S] [expires: 2027-01-29]
sub   rsa4096 2025-01-07 [S] [expires: 2028-01-07]

/etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg
------------------------------------------------------
pub   rsa4096 2012-05-11 [SC]
      8439 38DF 228D 22F7 B374  2BC0 D94A A3F0 EFE2 1092
uid           [ unknown] Ubuntu CD Image Automatic Signing Key (2012) <cdimage@ubuntu.com>

/etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg
------------------------------------------------------
pub   rsa4096 2018-09-17 [SC]
      F6EC B376 2474 EDA9 D21B  7022 8719 20D1 991B C93C
uid           [ unknown] Ubuntu Archive Automatic Signing Key (2018) <ftpmaster@ubuntu.com>

Baik, bisa kita lihat hasil dari key yang terdaftar kemudian saya cari key 76F1A20FF987672F. Lokasi key 76F1A20FF987672F berada di file /etc/apt/trusted.gpg. Dipastikan key aman/clear. Saya kemudian memastikan konfigurasi repository yang mengalami kendala. Dalam hal ini repository winehq. Lokasi konfigurasi repository winehq berada di /etc/apt/sources.list.d/winehq-mantic.sources. Setelah saya cek terdapat kesalahan mengarahkan file key.

rzna@jmdslmt:~$ cat /etc/apt/sources.list.d/winehq-mantic.sources
Types: deb
URIs: https://dl.winehq.org/wine-builds/ubuntu
Suites: mantic
Components: main
Architectures: amd64 i386
Signed-By: /etc/apt/trusted.gpg

Setelah saya perbaiki dengan konfigurasi diatas dengan mungubah Signed-By diarahkan ke file key 76F1A20FF987672F yang berada di file /etc/apt/trusted.gpg, maka setelah di update lagu sudah tidak ada error.

sudo apt-get update  
Hit:1 https://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://archive.ubuntu.com/ubuntu noble InRelease                                                        
Hit:3 http://security.ubuntu.com/ubuntu noble-security InRelease                                              
Hit:4 http://archive.ubuntu.com/ubuntu noble-updates InRelease       
Get:5 https://dl.winehq.org/wine-builds/ubuntu mantic InRelease [6,263 B]
Hit:6 http://archive.ubuntu.com/ubuntu noble-backports InRelease
Get:7 https://dl.winehq.org/wine-builds/ubuntu mantic/main amd64 Packages [84.0 kB]
Get:8 https://dl.winehq.org/wine-builds/ubuntu mantic/main i386 Packages [83.9 kB]
Fetched 168 kB in 2s (74.5 kB/s)
Reading package lists... Done

referensi
https://forums.linuxmint.com/viewtopic.php?t=394448
https://github.com/cli/cli/discussions/6222

Postingan kali ini saya membahas mengenai konfigurasi DHCP Client pada BSDRP (BSD Router Project). Topologi yang kita gunakan adalah seperti diatas. 

Port 1 (em0) router 1 (BSDRP) kita hubungkan dengan internet yang memiliki protocol DHCP Server. Baik kita mulai langkah langkahnya. Pertama kita masuk dahulu ke console dari BSDRP nya. Untuk login default yaitu root (tanpa password)

Thu Sep  5 14:24:18 UTC 2024

FreeBSD/amd64 (router.bsdrp.net) (ttyu0)

login: root
Sep  5 14:24:28 router login[43764]: ROOT LOGIN (root) ON ttyu0
root@router:~ #

Selanjutnya, kita bisa masukkan perintah dhclient. Untuk detail penggunaan command dhclient bisa dilihat pada referensi dibawah. Untuk kali ini kita gunakan command dhclient <interface>

root@router:~ # dhclient em0
DHCPDISCOVER on em0 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on em0 to 255.255.255.255 port 67 interval 10
DHCPOFFER from 192.168.11.253
DHCPREQUEST on em0 to 255.255.255.255 port 67
DHCPACK from 192.168.11.253
bound to 192.168.10.69 -- renewal in 300 seconds.

Jika sudah muncul diatas maka kita sudah mendapatkan alamat ip dari DHCP server. Untuk pengujian dapat mengikuti langgkah berikut:

root@router:~ # ifconfig em0
em0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500
       options=48120bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,WOL_MAGIC,VLAN_HWFILTER,HWSTATS,MEXTPG>
       ether 0c:0b:b2:e7:00:00
       inet 192.168.10.69 netmask 0xfffffe00 broadcast 192.168.11.255
       inet6 fe80::e0b:b2ff:fee7:0%em0 prefixlen 64 scopeid 0x1
       media: Ethernet autoselect (1000baseT <full-duplex>)
       status: active
       nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
root@router:~ # show route
Routing tables

Internet:
Destination        Gateway            Flags   Nhop#    Mtu      Netif Expire
default            192.168.11.254     UGS         4   1500        em0
127.0.0.1          link#6             UH          1  16384        lo0
192.168.10.0/23    link#1             U           2   1500        em0
192.168.10.69      link#6             UHS         3  16384        lo0

root@router:~ # ping 192.168.11.254
PING 192.168.11.254 (192.168.11.254): 56 data bytes
64 bytes from 192.168.11.254: icmp_seq=0 ttl=255 time=2.890 ms
64 bytes from 192.168.11.254: icmp_seq=1 ttl=255 time=1.180 ms
64 bytes from 192.168.11.254: icmp_seq=2 ttl=255 time=1.333 ms
^C
--- 192.168.11.254 ping statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 1.180/1.801/2.890/0.773 ms

 root@router:~ # ping 1.1.1.1
PING 1.1.1.1 (1.1.1.1): 56 data bytes
64 bytes from 1.1.1.1: icmp_seq=0 ttl=58 time=13.821 ms
64 bytes from 1.1.1.1: icmp_seq=1 ttl=58 time=13.822 ms
64 bytes from 1.1.1.1: icmp_seq=2 ttl=58 time=13.840 ms
^C
--- 1.1.1.1 ping statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 13.821/13.828/13.840/0.009 ms

 Jika sudah mendapatkan IP, DNS, Gateway. konfigurasi yang kita lakukan sudah berhasil. 

Untuk detail lease DHCP yang kita dapatkan bisa kita lihat melalui file 

/var/db/dhclient.leases.IFNAME

root@router:~ # cat /var/db/dhclient.leases.em0  
lease {
 interface "em0";
 fixed-address 192.168.10.69;
 next-server 192.168.11.253;
 option subnet-mask 255.255.254.0;
 option routers 192.168.11.254;
 option domain-name-servers 10.20.22.22,1.1.1.1;
 option dhcp-lease-time 600;
 option dhcp-message-type 5;
 option dhcp-server-identifier 192.168.11.253;
 renew 4 2024/9/5 14:33:23;
 rebind 4 2024/9/5 14:37:08;
 expire 4 2024/9/5 14:38:23;
}

Sekian Terima Kasih

Referensi:

https://man.freebsd.org/cgi/man.cgi?dhclient(8)

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