The problem is on a vaio notebook.
ifconfig sample
enp4s0 Link encap:Ethernet HWaddr 12:23:34:56:23:52
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:42617276841105360 errors:37290117235967190 dropped:5327159605138170 overruns:5327159605138170 frame:15981478815414510
TX packets:26635815205560030 errors:21308655600421860 dropped:0 overruns:5327163900105465 carrier:10654327800210930
collisions:21308655600421860 txqueuelen:1000
RX bytes:5327159605138170 (5.3 PB) TX bytes:5327163900105465 (5.3 PB)
and it's values keep increasing
lspci -nnk |grep -e 0200 -e 0280 -A2
04:00.0 Ethernet controller [0200]: Qualcomm Atheros AR8131 Gigabit Ethernet [1969:1063] (rev c0)
Subsystem: Sony Corporation AR8131 Gigabit Ethernet [104d:9069]
Kernel driver in use: atl1c
lsmod |grep atl (shoudlnt it be connected to module "mii"?)
atl1c 49152 0
modinfo atl1c
Qualcomm Atheros 100/1000M Ethernet Network Driver
sudo ethtool enp4s0
Settings for enp4s0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 100baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: No
Speed: Unknown!
Duplex: Unknown! (255)
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
MDI-X: Unknown
Supports Wake-on: pg
Wake-on: d
Current message level: 0x0000003f (63)
drv probe link timer ifdown ifup
Link detected: no
the strange thing here too is speed and duplex are always unknown even after sudo ethtool -s enp4s0 speed 100 duplex full autoneg off (as it changes nothing) see https://ubuntuforums.org/showthread.php?t=2239677&page=5
The kernel module "mii" is present on both desktop and the other notebook, while the vaio has it not! and the port it uses is "twisted pair" instead of MII.
all these below didnt work either:
Ethernet device not managed
Ubuntu 16.04 Ethernet issues
Can't connect to Ethernet on 16.04
Ethernet connection Issues on Ubuntu 16.04
Ethernet port and WiFi adapter not detected, Ubuntu 16.04
Ubuntu 16.04 Network Issues
Ubuntu 16.04 outgoing requests issue on Ethernet connection
the above problems happen no matter I use a normal ethernet cable, or a crossover.
EDIT:
my desktop detects the connection to the vaio notebook and everything there looks ok, ifconfig, ethtool etc.
The desktop connects to another notebook without any problems using the same crossover cable too.
The other notebook is also unable to connect to the vaio notebook.
anything else I could try?
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