How fast is 100basetx fd

We'll send a magic link to your inbox. Email Address. All Sign in options. Enter a Email Address. Choose your interests Get the latest news, expert insights and market research, sent straight to your inbox. Newsletter Topics Select minimum 1 topic. Operating Systems. Tags: Linux. Anonymous Posted December 13, 0 Comments. Use ethtool. Jalal Hajigholamali Posted December 13, 0 Comments.

Hi, ethtool — Display or change ethernet card settings. Jack Miller Posted December 15, 0 Comments. Hi, Find full or half duplex speed You can use dmesg command to find out your duplex mode: dmesg grep -i duplex Output: eth0: link up, Mbps, full-duplex, lpa 0x45E1ethtool command Uss ethtool to display or change ethernet card settings.

Register or Login. Welcome back! Reset Your Password We'll send an email with a link to reset your password. Improve this answer. Khaled Khaled If you get "Speed: Unknown! This only gives you the negotiated speed of your current network configuration hence your ethernet port must be connected. The speed indicated also depends on the cable and the other end of the connection.

For that, you need to look under Supported link modes also shown in ethtool. No sudo required! Christian Christian 1, 1 1 gold badge 8 8 silver badges 4 4 bronze badges. Note: Only available since 2. Getting "Invalid argument" — wi1. Christian Yes it is thanks, but only on some of my interfaces which I've read is expected so I'm all good — wi1.

Can someone clarify? I am running on a special purpose OS build without ethtool. Show 7 more comments. NOTE: the man page for mii-tool has this disclaimer: This program is obsolete. For replacement check ethtool. Use mii-tool to watch the negotiated network speed. Simon Gate Simon Gate 3 3 silver badges 2 2 bronze badges.

For Debian based systems, ethtool is not installed by default. But mii-tool is, as part of the essential "net-tools" package. So this was the best solution for me. I see this in the man page for mii-tool "This program is obsolete. For replace-ment check ethtool. This is for a USB 3. There are some great answers here, I just wanted to add a few more options.

You'll need two computers. On computer one, run iperf in server mode: iperf -s On the other, run iperf in client mode: iperf -c Community Bot 1. Ryan Babchishin Ryan Babchishin 5, 2 2 gold badges 16 16 silver badges 35 35 bronze badges. What was your eventual resolution to the non expected performance? Using iperf as you stated is the answer if one wants to get current speed and not simply the nic potential speed. Jed Daniels Jed Daniels 7, 2 2 gold badges 31 31 silver badges 41 41 bronze badges.

Use below command dmesg grep -i duplex Output: eth0: link up, Mbps, full-duplex, lpa 0x45E1 refer this. Vikas Hardia Vikas Hardia 5 5 silver badges 14 14 bronze badges. Useful when you don't have root access. I'm in the unfortunate situation. Please read other answers before answering. This has alread been said six years ago and is the accepted answer with 66 upvotes.

Given answers might not work for someone, so just wanted to add another option that suited me in my situation. Your answer is the exact same as the accepted one and does not add value. This is the accepted answer and it very clearly uses ethtool. Show 1 more comment. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.