Dear Debian community, I am puzzled with the following problem. When my Debian 10.8 starts, the unit "networking.service" is marked as failed with the following reason:
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 Tue 2021-02-16 08:56:16 CET; 5h 27min ago Docs: man:interfaces(5) Process: 691 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=1/FAILURE) Main PID: 691 (code=exited, status=1/FAILURE) however network is working just fine. I looked into /usr/lib/systemd/system/networking.service where TimeoutStartSec=5min and also set a big timeout for br0 in /etc/network/interfaces: auto lo auto eth0 auto eth1 iface lo inet loopback auto br0 iface br0 inet static ... bridge_ports eth0 eth1 bridge_maxwait 60 but still the error occurs each time. Relative dmesg logs are: Feb 16 08:56:16 debian systemd[1]: Starting Raise network interfaces... Feb 16 08:56:16 debian ifup[691]: ifup: unknown interface eth0 Feb 16 08:56:16 debian ifup[691]: ifup: unknown interface eth1 Feb 16 08:56:16 debian ifup[691]: Waiting for br0 to get ready (MAXWAIT is 60 seconds). Feb 16 08:56:16 debian systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE Feb 16 08:56:16 debian systemd[1]: networking.service: Failed with result 'exit-code'. Feb 16 08:56:16 debian systemd[1]: Failed to start Raise network interfaces. Feb 16 08:56:16.113716 debian systemd-udevd[387]: Using default interface naming scheme 'v240'. Feb 16 08:56:16.113796 debian systemd-udevd[387]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable. Feb 16 08:56:16.113851 debian systemd-udevd[387]: Could not generate persistent MAC address for br0: No such file or directory Feb 16 08:56:16.115750 debian kernel: bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this Feb 16 08:56:16.115828 debian kernel: br0: port 1(eth0) entered blocking state Feb 16 08:56:16.115875 debian kernel: br0: port 1(eth0) entered disabled state Feb 16 08:56:16.115929 debian kernel: device eth0 entered promiscuous mode Feb 16 08:56:16.119800 debian kernel: r8169 0000:02:00.0: firmware: direct-loading firmware rtl_nic/rtl8168g-2.fw Feb 16 08:56:16.120198 debian kernel: Generic PHY r8169-200:00: attached PHY driver [Generic PHY] (mii_bus:phy_addr=r8169-200:00, irq=IGNORE) Feb 16 08:56:16.251795 debian kernel: br0: port 2(eth1) entered blocking state Feb 16 08:56:16.251990 debian kernel: br0: port 2(eth1) entered disabled state Feb 16 08:56:16.391879 debian kernel: br0: port 1(eth0) entered blocking state Feb 16 08:56:16.391913 debian kernel: br0: port 1(eth0) entered forwarding state Feb 16 08:56:16.516862 debian systemd[1]: Starting Hostname Service... Feb 16 08:56:16.539520 debian systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE Feb 16 08:56:16.539612 debian systemd[1]: networking.service: Failed with result 'exit-code'. Feb 16 08:56:16.539994 debian systemd[1]: Failed to start Raise network interfaces. Feb 16 08:56:16.671750 debian kernel: br0: port 3(wlan0) entered blocking state Feb 16 08:56:16.671808 debian kernel: br0: port 3(wlan0) entered disabled state Feb 16 08:56:16.671844 debian kernel: device wlan0 entered promiscuous mode Feb 16 08:56:16.671878 debian kernel: br0: port 3(wlan0) entered blocking state Feb 16 08:56:16.671912 debian kernel: br0: port 3(wlan0) entered forwarding state Feb 16 08:56:16.683579 debian hostapd[879]: wlan0: interface state UNINITIALIZED->ENABLED Feb 16 08:56:16.683579 debian hostapd[879]: wlan0: AP-ENABLED Any ideas where can I take a look? Thanks in advance! -- With best regards, Dmitry