Network tools
My LAN was working at 100Mbps. To improve data transfer here, I bought a new 1GBit switch.
In the first moment, nothing changed. All connections was still transfering at 100Mbps. I have machines running Linux and Windows. Checking the NIC of all computers, I see that all of them are 1Gbps compatible.
So, let´s check the NIC´s.
Windows
Run this command at the console (powershell or cmd).
My result:
Ok, the windows running machine has a Gigabit NIC, but is using only 100Mbps. Should be the lan cable. I switched to a new CAT-5e, and it worked like a charm.
New results:
Linux
In another machine, a server running Debian, I have to check the same thing.
Listing the /sys/class/net folder we can get all the NIC´s (physical and logical). We need to identify the physical.
guionardo@furlan-server:~$ ls /sys/class/net
br-118e120c0ed5 br-8006552144f0 br-9baa19a039ab br-c031f2fd9034 enp2s0 veth0e1f9f5 veth3edbe57 veth763a5d9 vethff997b4
br-6f4f54be3aa6 br-8b05e808f775 br-be4b1c4c6490 docker0 lo veth0fe6d08 veth5ba2e03 veth7c4fb5c
In my case, is the enp2s0.
Now, we need to check the settings of the NIC.
The result was:
In linux, we can also use the ethtool command. If it isn´t installed, run the command sudo apt install ethtool or use the package manager of your linux distro.
guionardo@furlan-server:~$ ethtool enp2s0
for enp2s0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 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/Half 1000baseT/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
Auto-negotiation: on
master-slave cfg: preferred slave
master-slave status: slave
Port: Twisted Pair
PHYAD: 1
Transceiver: external
MDI-X: Unknown
error: Operation not permitted
Current message level: 0x000000ff (255)
drv probe link timer ifdown ifup rx_err tx_err
Link detected: yes
So, I had to replace the ETH cable like previous machine.
The new result was:
Ok, we have a Gigabit connection enabled. Let´s test it.
I´ll use iperf. On debian, if it isn´t installed, just run a sudo apt install iperf3 on both machines.
On one machine, start a iperf instance, as a server:
iperf3 -s
``
And on another one, start a iperf client. Check the IP orof the server machine.
``` bash
iperf3 -c furlan-server
The results:
│guionardo@furlan-server:~$ iperf3 -s
/mnt/c/dev │-----------------------------------------------------------
❯ iperf3 -c furlan-server │Server listening on 5201
Connecting to host furlan-server, port 5201 │-----------------------------------------------------------
[ 5] local 172.20.185.164 port 51290 connected to 192.168.88.35 port 5201 │Accepted connection from 192.168.88.100, port 58042
[ ID] Interval Transfer Bitrate Retr Cwnd │[ 5] local 192.168.88.35 port 5201 connected to 192.168.88.100 port 58044
[ 5] 0.00-1.00 sec 107 MBytes 896 Mbits/sec 0 3.11 MBytes │[ ID] Interval Transfer Bitrate
[ 5] 1.00-2.00 sec 104 MBytes 870 Mbits/sec 0 3.11 MBytes │[ 5] 0.00-1.00 sec 98.2 MBytes 823 Mbits/sec
[ 5] 2.00-3.00 sec 101 MBytes 850 Mbits/sec 0 3.11 MBytes │[ 5] 1.00-2.00 sec 105 MBytes 877 Mbits/sec
[ 5] 3.00-4.00 sec 105 MBytes 881 Mbits/sec 0 3.11 MBytes │[ 5] 2.00-3.00 sec 101 MBytes 851 Mbits/sec
[ 5] 4.00-5.00 sec 106 MBytes 891 Mbits/sec 0 3.11 MBytes │[ 5] 3.00-4.00 sec 104 MBytes 876 Mbits/sec
[ 5] 5.00-6.00 sec 108 MBytes 902 Mbits/sec 1 2.24 MBytes │[ 5] 4.00-5.00 sec 106 MBytes 888 Mbits/sec
[ 5] 6.00-7.00 sec 110 MBytes 923 Mbits/sec 0 2.44 MBytes │[ 5] 5.00-6.00 sec 109 MBytes 912 Mbits/sec
[ 5] 7.00-8.00 sec 110 MBytes 923 Mbits/sec 0 2.62 MBytes │[ 5] 6.00-7.00 sec 109 MBytes 917 Mbits/sec
[ 5] 8.00-9.00 sec 110 MBytes 923 Mbits/sec 0 2.75 MBytes │[ 5] 7.00-8.00 sec 110 MBytes 919 Mbits/sec
[ 5] 9.00-10.00 sec 110 MBytes 923 Mbits/sec 0 2.86 MBytes │[ 5] 8.00-9.00 sec 111 MBytes 928 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - - │[ 5] 9.00-10.00 sec 110 MBytes 919 Mbits/sec
[ ID] Interval Transfer Bitrate Retr │[ 5] 10.00-10.07 sec 7.32 MBytes 910 Mbits/sec
[ 5] 0.00-10.00 sec 1.05 GBytes 898 Mbits/sec 1 sender │- - - - - - - - - - - - - - - - - - - - - - - - -
[ 5] 0.00-10.07 sec 1.04 GBytes 891 Mbits/sec receiver │[ ID] Interval Transfer Bitrate
│[ 5] 0.00-10.07 sec 1.04 GBytes 891 Mbits/sec receiver
iperf Done. │-----------------------------------------------------------
│Server listening on 5201
/mnt/c/dev took 10s │-----------------------------------------------------------
❯ │
Links
- How to Verify the Speed of My NIC?
- Como saber a velocidade da placa de rede
- How to test the network speed/throughput between two Linux servers
Created: September 18, 2024