Depois de atualizar o servidor Debian 9 para 10 Buster, perdi a conexão de rede após 24 horas desde a reinicialização, acho que o problema é que não é possível renovar o endereço IP do servidor DHCP.
Em /var/lib/dhcpvejo o arquivo dhclient.eth0.leasescom data de expiração dentro.
Este serviço funcionou bem com o Debian 9, com o Debian 10 vejo este erro:
root@debian:~# systemctl status networking.service
● networking.service - Raise network interfaces
Loaded: loaded (/lib/systemd/system/networking.service; enabled;
vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 2019-07-25 15:18:02
CEST; 2h 39min ago
Docs: man:interfaces(5)
Process: 380 ExecStart=/sbin/ifup -a --read-environment
(code=exited, status=1/FAILURE)
Main PID: 380 (code=exited, status=1/FAILURE)
Jul 25 15:18:01 debian-2gb-nbg1-2 dhclient[402]: DHCPREQUEST for
116.203.xx.xx on eth0 to 255.255.255.255 port 67
Jul 25 15:18:01 debian-2gb-nbg1-2 dhclient[402]: DHCPACK of
116.203.xx.xx from 172.31.1.1
Jul 25 15:18:01 debian-2gb-nbg1-2 ifup[380]: DHCPACK of 116.203.xx.xx
from 172.31.1.1
Jul 25 15:18:01 debian-2gb-nbg1-2 dhclient[402]: bound to
116.203.xx.xx -- renewal in 34516 seconds.
Jul 25 15:18:01 debian-2gb-nbg1-2 ifup[380]: bound to 116.203.xx.xx
-- renewal in 34516 seconds.
Jul 25 15:18:02 debian-2gb-nbg1-2 ifup[380]: RTNETLINK answers:
Permission denied
Jul 25 15:18:02 debian-2gb-nbg1-2 ifup[380]: ifup: failed to bring up eth0:0
Jul 25 15:18:02 debian-2gb-nbg1-2 systemd[1]: networking.service: Main
process exited, code=exited, status=1/FAILURE
Jul 25 15:18:02 debian-2gb-nbg1-2 systemd[1]: networking.service:
Failed with result 'exit-code'.
Jul 25 15:18:02 debian-2gb-nbg1-2 systemd[1]: Failed to start Raise
network interfaces.
Obrigado por qualquer ajuda.
Editar: problema resolvido, parece que o Debian 10 não gosta de desabilitar o IPv6 da mesma forma que a v9.
Se alguém souber como desabilitar o IPv6 no Buster, avise-nos.
# disabling of IPv6 in Debian 9, not working in Debian 10
/etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6=1
net.ipv6.conf.default.disable_ipv6=1
net.ipv6.conf.lo.disable_ipv6=1