Pierre Col a publié dans ZDnet un article amusant sur les dangers que présente la faune pour les réseaux informatiques :
►http://www.zdnet.fr/blogs/infra-net/la-faune-americaine-ennemie-d-internet-39764091.htm
Le sujet a branché les membres de #NANOG, groupe d’opérateurs réseaux (et non pas de zoologistes comme on pourrait le croire à la lecture de leurs témoignages. J’ai appris beaucoup de choses en lisant les contribution des héros inconnus qui défendent notre Internet chéri contre une faune hostile :
Joel jaeggli :
«
montana experience says:
cows have rather thick skin, sheep come with insulation, and bison will
go through anything that gets in their way including 3 x 6" diameter
corner posts and 4 strands of barbed and 2 hot wires.
horses on the other hand are pansies.
livestock always ends up on the other side of the fence...
»
Jason Baugher :
«
In Illinois:
Cows actually train to electric fence (hot wire) fairly well. They
don’t like being shocked too much. Once they get used to the fence,
you can shut it off and they’ll stay in for weeks because they won’t
even attempt it. That said, sometimes you get a cow that just really
wants to be difficult and will go through anything. That cow is
suddenly turned into hamburger.
Pigs also train to electric fence well. As tough as their hide is, it
shocks well.
Sheep are difficult. Other than when they are recently sheared, they
have a natural protection across 95% of their body. Unless it hits
them in the head or lower leg, they aren’t going to feel it. Even when
sheared, they are a very stubborn animal. I’ve seen them standing
facing a fence, swaying forward and backward, almost like they’re
trying to time the shock pulse. Then they go on through and tear up
the wire and posts in the process. I’ve seen 4 strands of wire spaced
about 10 inches apart and they won’t stay in.
Horses are okay, but you have to tie things to the wire so they can
see it. They’re too dumb to remember where it is, apparently.
There is a big range of fence boxes. Some have a long pulse that isn’t
too “hot”. If you hold one of these, they make your hand and arm
muscles clench up but they don’t hurt too much. The other end of the
range have a short “hot” pulse that will jump a good distance and will
burn through green weeds. These hurt.
»
JC Dill :
«
This has nothing to do with the horse’s ability to see or remember
where the fence it. It has to do with the value (both financial and
emotional) the owner places on the animal, and the ensuing costs if it
breaks the fence. Horses can get hurt quite easily, vet bills can run
into hundreds or thousands of dollars quite quickly. Most horse
owners will spend far more than the replacement cost of the animal in
vet bills and husbandry to heal it when it gets injured, because the
animal has a “member of the household” status in their lives and can’t
easily be replaced by a similar animal. So they flag wire fences to
help the horse avoid getting hurt. Then there’s liability. In many
states, if a horse gets out on the road and gets hit, the horse owner
is liable for the damages to the car and occupants. If someone in the
car is injured or killed (likely if the horse is hit head-on and comes
thru the windshield) the liability costs can be significant, run into
millions of dollars. For this reason, many equestrian insurance
policies require that electric fencing be flagged.
Other livestock aren’t as likely to cause fatal injuries to car
occupants if they are hit, because the animal’s body is lower to the
road, less likely to come over the hood.
»
#résilience #Internet #sécurité #meuh
