An internet access box and local network router, dating from a few years. Offers ethernet and WiFi networking of computers.
Your computer has a newer ethernet interface with gigabit capability. You connected it to the local network through an Ethernet cable.
The Ethernet Issue
Though you set up everything right, your computer hardly accesses the network.
Open a console. As root
Jan 3 23:02:23 linux-desk kernel: [46358.225641] e1000e 0000:00:19.0: eth0: 10/100 speed: disabling TSO Jan 3 23:02:25 linux-desk kernel: [46359.875882] e1000e: eth0 NIC Link is Down Jan 3 23:02:27 linux-desk kernel: [46361.550465] e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None Jan 3 23:02:27 linux-desk kernel: [46361.550470] e1000e 0000:00:19.0: eth0: 10/100 speed: disabling TSO Jan 3 23:02:27 linux-desk kernel: [46361.562789] e1000e: eth0 NIC Link is Down
As you see, the kernel ethernet interface module is e1000e. For some reason, it does not successfully negociate with the router. The router IP address is generally 192.168.1.1 (check your documentation).
reports delays and packet loss
reports the situation of your computer ethernet interface. It has Auto-negociation on, and the Speed is likely 100Mb/s or more (which your Livebox can't match).
Force the speed of your computer ethernet interface
You should get your connection right for the current session. If true, make the change permanent. Edit /etc/sysconfig/network/ifcfg-eth0, line ETHTOOL_OPTIONS, as:
BOOTPROTO='dhcp' BROADCAST='' ETHTOOL_OPTIONS='speed 10 duplex full' IPADDR='' MTU='' NAME='Intel Ethernet controller' NETMASK='' NETWORK='' REMOTE_IPADDR='' STARTMODE='auto' USERCONTROL='no' PREFIXLEN='24'
Note: do not copy the -s of the command line options to the file.