Ethernet eth0 + DVR

I'm having a problem with my Raspberry Pi 5, which I describe below.

I have a DVR connected to it via Ethernet.

If I connect both at the same time, dmesg reports a failure and I can't ping the DVR to establish a connection; I have to run `ifconfig eth0 down` and `ifconfig eth0 up`.

Can anyone help or know if there's a bug in the kernel version? I'm using Ubuntu 22.04. jammy

root:~# dmesg | grep eth0

[    1.312167] macb 1f00100000.ethernet eth0: Cadence GEM rev 0x00070109 at 0x1f00100000 irq 108 (2c:cf:67:81:d6:2a)

[    3.237493] systemd[1]: Found device /sys/subsystem/net/devices/eth0.

[    3.453483] systemd[1]: Started ifup for eth0.

[    3.573655] macb 1f00100000.ethernet eth0: PHY [1f00100000.ethernet-ffffffff:01] driver [Broadcom BCM54213PE] (irq=POLL)

[    3.573668] macb 1f00100000.ethernet eth0: configuring for phy/rgmii-id link mode

[    6.441950] macb 1f00100000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off

[   11.560707] macb 1f00100000.ethernet eth0: Link is Down

[   13.605678] macb 1f00100000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off

root:~# ping 192.168.200.201

PING 192.168.200.201 (192.168.200.201) 56(84) bytes of data.

^C

--- 192.168.200.201 ping statistics ---

6 packets transmitted, 0 received, 100% packet loss, time 13305ms

root:~# ifconfig eth0 down

root:~# ifconfig eth0 up

root:~# dmesg | grep eth0

[    1.312167] macb 1f00100000.ethernet eth0: Cadence GEM rev 0x00070109 at 0x1f00100000 irq 108 (2c:cf:67:81:d6:2a)

[    3.237493] systemd[1]: Found device /sys/subsystem/net/devices/eth0.

[    3.453483] systemd[1]: Started ifup for eth0.

[    3.573655] macb 1f00100000.ethernet eth0: PHY [1f00100000.ethernet-ffffffff:01] driver [Broadcom BCM54213PE] (irq=POLL)

[    3.573668] macb 1f00100000.ethernet eth0: configuring for phy/rgmii-id link mode

[    6.441950] macb 1f00100000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off

[   11.560707] macb 1f00100000.ethernet eth0: Link is Down

[   13.605678] macb 1f00100000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off

[  147.034711] macb 1f00100000.ethernet eth0: Link is Down

[  151.855860] macb 1f00100000.ethernet eth0: PHY [1f00100000.ethernet-ffffffff:01] driver [Broadcom BCM54213PE] (irq=POLL)

[  151.855871] macb 1f00100000.ethernet eth0: configuring for phy/rgmii-id link mode

[  152.869842] macb 1f00100000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off

root:~# ping 192.168.200.201

PING 192.168.200.201 (192.168.200.201) 56(84) bytes of data.

64 bytes from 192.168.200.201: icmp_seq=1 ttl=64 time=1.01 ms

64 bytes from 192.168.200.201: icmp_seq=2 ttl=64 time=1.01 ms

^C

--- 192.168.200.201 ping statistics ---

2 packets transmitted, 2 received, 0% packet loss, time 1001ms

rtt min/avg/max/mdev = 1.007/1.007/1.007/0.000 ms