On 4/28/21 11:14 AM, John Jason Jordan wrote: > ethtool enx3ce1a1c0dbfc > Settings for enx3ce1a1c0dbfc: > Supported ports: [ TP MII ] > Supported link modes: 10baseT/Half 10baseT/Full > 100baseT/Half 100baseT/Full > 1000baseT/Half 1000baseT/Full > Supported pause frame use: No > Supports auto-negotiation: Yes > Supported FEC modes: Not reported > Advertised link modes: 10baseT/Half 10baseT/Full > 100baseT/Half 100baseT/Full > Advertised pause frame use: Symmetric Receive-only > Advertised auto-negotiation: Yes > Advertised FEC modes: Not reported > Link partner advertised link modes: 10baseT/Half 10baseT/Full > 100baseT/Half > 100baseT/Full 1000baseT/Full > Link partner advertised pause frame use: Symmetric Receive-only > Link partner advertised auto-negotiation: Yes > Link partner advertised FEC modes: Not reported > Speed: 100Mb/s > Duplex: Full
John,
to clarify this data: you are getting 90 Mbps because your interface is
locked to 100 Mbps. you can bash your head against the wall all day,
you're not going to get any more speed.
Your chipset supports:
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
But you are only getting advertised as
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Note that '1000baseT/Half 1000baseT/Full' is missing.
Thus, either your router port no longer can handle 1000Mbps (not likely
since the desktop is working), have a bad router port, or you have a bad
cable. Or a CAT5 cable. It is not uncommon for the connectors to bad -
either pins or the clip.
Max speed Max bandwidth
Cat 5e 100 Mbps 100 MHz
Cat 5e 1,000 Mbps 100 MHz
Cat 6 1,000 Mbps 250 MHz
Cat 6a 10,000 Mbps 500 MHz
Cat 7 10,000 Mbps 600 MHz
The "cat number" is usually written on the cable unless you picked up a
weird aftermarket patch cord.
For grins ad giggles you can try this to see it the speed suddenly
jumps. ifconfig may display a bunch of TX errors, but at least it will
isolate the issue a bit more. Ignore the VPN for now - it is irrelevant
for hardware troubleshooting.
# ethtool -s eth0 speed 1000 duplex full
'ethtool eth0' should now report 1000 Mb/s and you can try a speed test.
-Ed
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