This one can be frustrating. I travel between networks alot, and I cannot predict the condition of the network equipment to which I’ll be physically connecting (when I’m not wireless).<\/p>\n
Many, many times, it’s Cisco switches; and for some reason, with Cisco my laptop (and other machines for that matter) does not auto-negotiate the 100Mb Full Duplex that it should (this used to happen all the time with Solaris boxes I worked with too, so don’t just blame Linux). It will often negotiate half-duplex on the computer end, and upon investigation of the switch, the switch believes it has negotiated full-duplex. Not alot of goodness ensues…<\/p>\n
Anyway, I encourage you to memorize the following. You might need it as often as I do! This command will disable auto-negotiation and set your interface to 100FD. Life will be good (this command assumes the interface in question is eth0)….<\/p>\n
If you just want to check what your interface is set to (or negotiated) use this command:<\/p>\n …and of course, you should always verify with “man ethtool”… trust, but verify…<\/p>\n \ud83d\ude09<\/p>\n Follow-up: By the way, if you’re wondering why I don’t just use “ This one can be frustrating. I travel between networks alot, and I cannot predict the condition of the network equipment to which I’ll be physically connecting (when I’m not wireless). Many, many times, it’s Cisco switches; and for some reason,…ethtool -s eth0 autoneg off speed 100 duplex full<\/font><\/code><\/p>\nethtool eth0<\/code><\/p>\nmii-tool<\/code>“, it’s because that tool has been deprecated and is no longer being (or soon will no longer be) provided with some distros. Of course, some older NICs require “mii-tool<\/code>“, so you might need to install it if that’s the case for you….<\/p>\n","protected":false},"excerpt":{"rendered":"
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