Internet Connection slow with Linux

I have a problem with my new internet connection. This is a symmetric 500Mbs connection but i only get 50M in my linux computer (fedora 30). In windows I get 500Mb for up and down with other computer. I know that the problem is in my ethernet connection in linux because my speed in ethernet card is 100Mb. I don't know why. This is the ethernet card values (it supports 1Gb) Supported ports: [ TP MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: Symmetric Receive-only Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised pause frame use: Symmetric Receive-only Advertised auto-negotiation: No Advertised FEC modes: Not reported Speed: 100Mb/s Duplex: Half Port: MII PHYAD: 0 Transceiver: internal Auto-negotiation: off Supports Wake-on: pumbg Wake-on: d Current message level: 0x00000033 (51) drv probe ifdown ifup Link detected: yes I tried with ethtool but when I try to change to 1000Mb/s with $ sudo ethtool -s enp3s0 speed 1000 duplex full Settings for enp3s0: Supported ports: [ TP MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: Symmetric Receive-only Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: 1000baseT/Full Advertised pause frame use: Symmetric Receive-only Advertised auto-negotiation: No Advertised FEC modes: Not reported Speed: 1000Mb/s Duplex: Full Port: MII PHYAD: 0 Transceiver: internal Auto-negotiation: off Supports Wake-on: pumbg Wake-on: d Current message level: 0x00000033 (51) drv probe ifdown ifup Link detected: no but I get no link connection If I try to up the enp3s0 the 1000Mb speed disappears and I get 100M again $ sudo ifup enp3s0 $ Settings for enp3s0: Supported ports: [ TP MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: Symmetric Receive-only Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: 1000baseT/Full Advertised pause frame use: Symmetric Receive-only Advertised auto-negotiation: No Advertised FEC modes: Not reported Speed: 100Mb/s Duplex: Half Port: MII PHYAD: 0 Transceiver: internal Auto-negotiation: off Supports Wake-on: pumbg Wake-on: d Current message level: 0x00000033 (51) drv probe ifdown ifup Link detected: yes enp3s0: 100 Mbit, half duplex, link ok $ I don't know what else to try. Thanks