Por algum motivo, de repente não consigo mais acessar a Internet após (re) inicializar, consigo executar ping em 8.8.8.8, mas não em google.com, portanto, há um problema com a resolução de nomes. Se eu correr
sudo systemctl enable systemd-resolved
Eu recupero o acesso à Internet.
systemctl status systemd-resolved.service
dá
systemd-resolved.service - Network Name Resolution
Loaded: loaded (/lib/systemd/system/systemd-resolved.service; disabled; vendor preset: enabled)
Active: active (running) since Tue 2023-07-18 21:07:34 CEST; 40min ago
Docs: man:systemd-resolved.service(8)
man:org.freedesktop.resolve1(5)
https://www.freedesktop.org/wiki/Software/systemd/writing-network-configuration-managers
https://www.freedesktop.org/wiki/Software/systemd/writing-resolver-clients
Main PID: 12966 (systemd-resolve)
Status: "Processing requests..."
Tasks: 1 (limit: 9213)
Memory: 4.9M
CPU: 1.073s
CGroup: /system.slice/systemd-resolved.service
└─12966 /lib/systemd/systemd-resolved
jul 18 21:07:34 chewbacca systemd-resolved[12966]: Positive Trust Anchors:
jul 18 21:07:34 chewbacca systemd-resolved[12966]: . IN DS 20326 8 2 e06d44b80b8f1d39a95c0b0d7c65d08458e880409bbc683457104237c7f8ec8d
jul 18 21:07:34 chewbacca systemd-resolved[12966]: Negative trust anchors: home.arpa 10.in-addr.arpa 16.172.in-addr.arpa 17.172.in-addr.arpa 18.172.in-addr.a>
jul 18 21:07:34 chewbacca systemd-resolved[12966]: Using system hostname 'chewbacca'.
jul 18 21:07:34 chewbacca systemd-resolved[12966]: wlp2s0: Bus client set default route setting: yes
jul 18 21:07:34 chewbacca systemd[1]: Started Network Name Resolution.
jul 18 21:07:34 chewbacca systemd-resolved[12966]: wlp2s0: Bus client set DNS server list to: 46.227.67.134, 192.165.9.158
jul 18 21:07:48 chewbacca systemd-resolved[12966]: Using degraded feature set UDP instead of UDP+EDNS0 for DNS server 46.227.67.134.
jul 18 21:13:02 chewbacca systemd-resolved[12966]: Using degraded feature set UDP instead of UDP+EDNS0 for DNS server 46.227.67.134.
jul 18 21:15:39 chewbacca systemd-resolved[12966]: Grace period over, resuming full feature set (UDP+EDNS0) for DNS server 46.227.67.134.
Eu defini os servidores DNS em /etc/systemd/resolved.conf:
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Entries in this file show the compile time defaults. Local configuration
# should be created by either modifying this file, or by creating "drop-ins" in
# the resolved.conf.d/ subdirectory. The latter is generally recommended.
# Defaults can be restored by simply deleting this file and all drop-ins.
#
# Use 'systemd-analyze cat-config systemd/resolved.conf' to display the full con
fig.
#
# See resolved.conf(5) for details.
[Resolve]
# Some examples of DNS servers which may be used for DNS= and FallbackDNS=:
# Cloudflare: 1.1.1.1#cloudflare-dns.com 1.0.0.1#cloudflare-dns.com 2606:4700:47
00::1111#cloudflare-dns.com 2606:4700:4700::1001#cloudflare-dns.com
# Google: 8.8.8.8#dns.google 8.8.4.4#dns.google 2001:4860:4860::8888#dns.goo
gle 2001:4860:4860::8844#dns.google
# Quad9: 9.9.9.9#dns.quad9.net 149.112.112.112#dns.quad9.net 2620:fe::fe#dn
s.quad9.net 2620:fe::9#dns.quad9.net
DNS=46.227.67.134
FallbackDNS=192.165.9.158
#Domains=
#DNSSEC=no
#DNSOverTLS=no
#MulticastDNS=no
#LLMNR=no
#Cache=no-negative
#CacheFromLocalhost=no
#DNSStubListener=yes
#DNSStubListenerExtra=
#ReadEtcHosts=yes
#ResolveUnicastSingleLabel=noresolved.conf:
Estou um pouco perdido aqui, pois tudo estava funcionando bem ontem, pesquisei várias horas no Google, mas não encontrei uma solução para o motivo pelo qual de repente preciso iniciar manualmente o systemd-resolved para obter acesso à Internet. Isso está no Ubuntu 22.04 LTS. Observe que defini os mesmos 2 servidores DNS em meu roteador e também os adicionei à guia de configurações IPv4 das Conexões de Rede (por meio da GUI). Qualquer indicação será apreciada!
Obrigado/Evert