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trouble with my network card




Hi,
I have a trouble with my network card (extern card)
lspci gives:
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 02)
mii-tool  enp4s0
SIOCGMIIPHY on 'enp4s0' failed: No such device

ifconfig  enp4s0
enp4s0: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.10.20  netmask 255.255.255.0  broadcast 192.168.10.255
        ether 00:e0:4c:68:0d:d7  txqueuelen 1000  (Ethernet)
        RX packets 32  bytes 1920 (1.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
I can ping it in the local machine
but not from another machine,  the lightspot of the card is off !!!

What is happening ??  mii-tool doesn't find it but I can put an address??

thanks for help
regards