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Why the Internet connection may be interrupted after the first launch /usr/sbin/dhclient?

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I have debian-11.6.0-amd64-netinst installed on my PC. This PC is connected to the router by wire. After rebooting the PC and running /usr/sbin/dhclient for a while (about 10 minutes), the computer connects to the Internet, after which the connection is interrupted. The ping 8.8.8.8 command returns a Network is unreachable. If i run /usr/sbin/dhclient again, the connection will be restored and will no longer be interrupted until the PC is turned off. Why can this behavior be caused and how to configure the system so that the connection is established from the start of the first command?

My Internet router is successfully and constantly used by several devices in the house. On other devices, this problem was not noticed. On the same hardware where the problem described above is, if I start Windows, then there is no problem either. The same problem occurs both on Debian 11 and 10. And the exact same problem occurs if you connect not by wire, but by Wi-Fi.

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