禁用 IPv6 时，Debian 10 Buster 无法将 DHCP 续订为客户端

Question

我将 Debian 9 升级到 10 Buster 服务器在重新启动后 24 小时后失去网络连接，我认为问题是它无法从 DHCP 服务器更新 IP 地址。

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我看到里面有过期日期的/var/lib/dhcp文件。dhclient.eth0.leases

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该服务在 Debian 9 上正常，在 Debian 10 上我看到此错误：

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root@debian:~# systemctl status networking.service\n\xe2\x97\x8f networking.service - Raise network interfaces\n   Loaded: loaded (/lib/systemd/system/networking.service; enabled;\nvendor preset: enabled)\n   Active: failed (Result: exit-code) since Thu 2019-07-25 15:18:02\nCEST; 2h 39min ago\n     Docs: man:interfaces(5)\n  Process: 380 ExecStart=/sbin/ifup -a --read-environment\n(code=exited, status=1/FAILURE)\n Main PID: 380 (code=exited, status=1/FAILURE)\n\nJul 25 15:18:01 debian-2gb-nbg1-2 dhclient[402]: DHCPREQUEST for\n116.203.xx.xx on eth0 to 255.255.255.255 port 67\nJul 25 15:18:01 debian-2gb-nbg1-2 dhclient[402]: DHCPACK of\n116.203.xx.xx from 172.31.1.1\nJul 25 15:18:01 debian-2gb-nbg1-2 ifup[380]: DHCPACK of 116.203.xx.xx\nfrom 172.31.1.1\nJul 25 15:18:01 debian-2gb-nbg1-2 dhclient[402]: bound to\n116.203.xx.xx -- renewal in 34516 seconds.\nJul 25 15:18:01 debian-2gb-nbg1-2 ifup[380]: bound to 116.203.xx.xx\n-- renewal in 34516 seconds.\nJul 25 15:18:02 debian-2gb-nbg1-2 ifup[380]: RTNETLINK answers:\nPermission denied\nJul 25 15:18:02 debian-2gb-nbg1-2 ifup[380]: ifup: failed to bring up eth0:0\nJul 25 15:18:02 debian-2gb-nbg1-2 systemd[1]: networking.service: Main\nprocess exited, code=exited, status=1/FAILURE\nJul 25 15:18:02 debian-2gb-nbg1-2 systemd[1]: networking.service:\nFailed with result 'exit-code'.\nJul 25 15:18:02 debian-2gb-nbg1-2 systemd[1]: Failed to start Raise\nnetwork interfaces.\n

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谢谢你的帮助。

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编辑：\n问题已解决，看起来 Debian 10 不喜欢像 v9 那样禁用 IPv6。

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如果有人知道如何在 Buster 中禁用 IPv6，请告诉我们。

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# disabling of IPv6 in Debian 9, not working in Debian 10\n/etc/sysctl.conf\n    net.ipv6.conf.all.disable_ipv6=1\n    net.ipv6.conf.default.disable_ipv6=1\n    net.ipv6.conf.lo.disable_ipv6=1\n

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