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Re: [tlug] Tip of the Day: "ghosting" a machine with nc and dd



Josh Glover さんは書きました:
On 18/07/07, Curt Sampson <cjs@example.com> wrote:

Every 1000base-TX interface I've seen, and some of the newer 100base-TX
hubs at least, do auto-MDX, so in those cases it doesn't matter if you
use a crossover or a regular cable.

This knowledge has saved me running out to get a cable in the past.

Very cool!

Please resend this as a Tip of the Day and add it to the wiki!

FYI, from wikipedia:

Automatic crossover NICs

Almost all newer Ethernet network interface cards (NICs), switches and hubs automatically apply an internal crossover when necessary. This feature is known by various vendor-specific terms, e.g., Netgear calls it Auto uplink and trade, and other common vendor terms include Auto-MDI/MDI-X, Universal Cable Recognition and Auto Sensing. This eliminates the need for crossover cables, obsoletes the uplink/normal ports and manual selector switches found on many older hubs and switches, and greatly reduces installation errors, especially by non-technical users.

Automatic MDI/MDI-X capability is specified in the 1000BASE-T standard, so straight-through cables will work in almost all cases. But it is optional, so a crossover cable is needed if neither of the connected devices supports it, or the function has been disabled. Unlike the crossover cable described above, with only pairs 2 and 3 swapped, a 1000BASE-T crossover cable also has pairs 1 and 4 swapped.


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