[SOLVED] Network dead after update (8.1.10)

2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr0 state UP group default qlen 1000
link/ether 9c:6b:00:7c:ac:52 brd ff:ff:ff:ff:ff:ff
3: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 9c:6b:00:7c:ac:52 brd ff:ff:ff:ff:ff:ff
inet 10.23.34.227/24 scope global vmbr0
valid_lft forever preferred_lft forever
inet6 fe80::9e6b:ff:fe7c:7ca2/64 scope link
valid_lft forever preferred_lft forever
I'm guessing this output is with the working kernel.

Better would be - post the output of ip a & cat /etc/network/interfaces with the problematic kernel (NW down). You will probably need a keyb & monitor connected to the host.
 
Here is kernel which is not working:


Bash:
iface umbrO inet static
       address 10.1.5.227/24
       gateway 10.1.5.1
       bridge-ports enp4s0
       bridge-stp off
       bridge-fd 0


source /etc/network/interfaces.d"
rooteproxmox:-U ip a
1: lo: <1.00PBACK,UP,LOWEE UP> mtu 65536 qdisc noqueue state UNKNOWN group default glen 1000
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
     inet 127.0.0.1/0 scope host lo
       ualid_lft foreuer preferred_lft foreuer
     inet6 ::1/120 scope host noprefixroute
       ualid_lft foreuer preferred_lft foreuer
 2: umbrO: <BROADCAST,MULTICAST,UP,LOWERUP> mtu 1500 qdisc noqueue state UP group default glen 1000
     link/ether fa:86:c1:e9:43:d7 brd ff:ff:ff:ff:ff:ff
     inet 10.1.5.227/24 scope global umbrO
       ualid_lft foreuer preferred_lft foreuer
     inet6 fe00::ace6:flff:fed5:8873/64 scope link
       ualid_lft foreuer preferred_lft foreuer
 3: tap100i0: OROADCAST,MULTICAST,PROMISC,UP,LOWER UP> mtu 1500 qdisc pfifo_fast master fwbr100i0 state UNKNOWN group default glen 1000
     link/ether ea:b7:48:4f:70:b5 brd ff:ff:ff:ff:ff:ff
  1: fwbr100i0: OROADCAST,MULTICAST,UP,LOWER UP> mtu 1500 qdisc noqueue state UP group default glen 1000
      link/ether 66:69:ft:3f:47:16 brd ff:ff:ff:ff:ff:ff
  5: fwpr100p00fw1n100i0: <BROADCAST,MULTICAST,UP,LOWER UP> mtu 1500 qdisc noqueue master umbrO state UP group default glen 1000
      link/ether fa:86:c1:e9:43:d7 brd ff:ff:ff:ff:ff:ff
  5: fw1n100100fwpr100p0: <BROADCAST,NULTICAST,UP,LOWER UP> mtu 1500 qdisc noqueue master far10010 state UP group default glen 1000
      link/ether 66:69:fa:3f:47:16 brd ff:ff:ff:ff:ff:ff
  7: ueth111i00if2: OROADCASTAULTICAST,UP,LOWER UP> mtu 1500 qdisc noqueue master umbrO state UP group default glen 1000
      link/ether fe:Oa:5f:b2:76:b4 brd ff:ff:ff:ff:ff:ff link-netnsid 0
     ueth103i0@if2: <BROADCASTAULTICAST,UP,LOWEB UP> mtu 1500 qdisc noqueue master umbrO state UP group default glen 1000
      link/ether fe:19:30:0a:46:6e brd ff:ff:ff:ff:ff:ff link-netnsid 1
   9: tap108i0: OROADCASTMULTICAST,PROMISC,UP,LOWER UP> mtu 1500 qdisc pfifo_fast master fwbr100i0 state UNKNOWN group default glen 1000
      link/ether 7e:fb:a5:17:4e:05 brd ff:ff:ff:ff:ff:ff
   10: fwbr108i0: <BROADCAST,NULTICAST,UP,LOWEB_UP> mtu 1500 qdisc noqueue state UP group default glen 1000
      link/ether d6:Ob:42:ba:92:98 brd ff:ff:ff:ff:ff:ff
   11: fupr108p00fw1n108i0: OROADCA3T,MULTICAST,UP,LOWER UP> mtu 1500 Oise noqueue master umbrO state UP group default glen 1000
      link/ether 0a:39:29:4e:87:9c brd ff:ff:ff:ff:ff:ff
   12: fwIn108i00fwpr108p0: ORDADCA3T,MULTICAST,UP,LOWER_UP> mtu 1500 gdisc noqueue master fwbr108i0 state UP group default glen 1000
       link/ether d6:0b:42:ba:92:98 brd ff:ff:ff:ff:ff:ff
   13: tap11510: <BROADCAST,MULTICAST,PROMISC,UP,LOWER UP> mtu 1500 gdisc pfifo_fast master fwbr115i0 state UNKNOWN group default glen 1000
       link/ether f6:b7:7f:f9:5f:3f brd ff:ff:ff:ff:ff:ff
   14: fwbr115i0: OBOADCASTAULTICAST,UP,LOWER UP> mtu 1500 Oise noqueue state UP group default glen 1000
       link/ether be:f8:57:2f:66:90 brd ff:ff:ff:ff:ff:ff
   15: fupr115p00fwln115i0: <BROADCASTAULTICAST,UP,LOWER_UP> mtu 1500 Oise noqueue master umbrO state UP group default glen 1000
       link/ether ca:9a:76:df:ee:99 brd ff:ff:ff:ff:ff:ff
   16: fialn115i00fwpr115p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 Oise noqueue master fwbr115i0 state UP group default glen 1000
       link/ether be:f8:57:2f:66:90 brd ff:ff:ff:ff:ff:ff
    17: tap119i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 Oise pfifo_fast master fubr119i0 state UNKNOWN group default glen 1000
       link/ether 7a:ame2:e9:10:d9 brd ff:ff:ff:ff:ff:ff
    18: fubr119i0: <BR0ADCA3T,MULTICAST,UP,LOWER_UP> mtu 1500 Oise noqueue state UP group default glen 1000
       link/ether b6:11:c1:d0:50:ef brd ff:ff:ff:ff:ff:ff
    19: fwpr119p00fuln119i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 Oise noqueue master umbrO state UP group default glen 1000
       link/ether 1a:c1:a1:26:dd:a9 brd ff:ff:ff:ff:ff:ff
    20: fw1n119i00fwpr119p0: <BROADCASTAULTICAST,UP,LOWEB_UP> mtu 1500 gdisc noqueue master fwbr119i0 state UP group default glen 1000
       link/ether b6:11:c1:d0:50:cf brd ff:ff:ff:ff:ff:ff
    21: tap102i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 Oise pfifo_fast master fwbr10210 state UNKNOWN group default glen 1000
        link/ether 9a:2b:24:8b:42:07 brd ff:ff:ff:ff:ff:ff
    22: fubr102i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 Oise noqueue state UP group default glen 1000
        link/ether ce:b4:7B:ed:24:e9 brd ff:ff:ff:ff:ff:ff
    Z3: fwpr102p0Pfuln102i0: <BROADCASTAULTICAST,UP,LOWER_UP> mtu 1500 Oise noqueue master umbrO state UP group default glen 1000
        link/ether aa:32:44:42:58:ba brd ff:ff:ff:ff:ff:ff
     24: fuln102i061wpr1040: <BROADCASTAULTICAST,UP,LOWER_UP> mtu 1500 Oise noqueue master fwbr102i0 state UP group default glen 1000
        link/ether ce:b4:78:ed:24:e9 brd ff:ff:ff:ff:ff:ff
     rootOproxmox:"U
 
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Very odd indeed - what changed vmbr0 to umbr0 throughout your output? (Guessing that OCR used?).

bridge-ports enp4s0
As noted that port enp4s0 does not appear in subsequent output, but nor does any other.

rooteproxmox:-U
What is this? (OCR used?).

What does lspci -v now show for that NIC.



Do you have ANY PCI passthrough going on?

For testing I'd try stopping any passthrough & set all VMs & LXCs not to run on boot. That will clear the output somewhat.

Those Realtec NICs can be a real nightmare. I believe this thread would be better suited to your issue.