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

[Nguyen Vu Hung <vu-hung@example.com>]

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.