On Sat, 12 Feb 2000, Ferenc Tamas Gyurcsan wrote:
> >> 127.0.0.1 - 255.0.0.0 ! 0 - 0 -
> This shouldn't be a problem. It's in every linux systems, and also in the
> networking howto. This is just the loopback. Right?
Yeah, but it may well be a problem. The FLAGS value is `!' which is bogus,
and there's no interface associated with it. It should be lo0 under
linux. Also, you don't ordinarily see a route directly to localhost...
it's usually routed to by the localnet route, which generally looks like
this:
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
The U in the flags column indicates the route is `up' -- the lack of a H
or G flag (indicating a HOST or GATEWAY route, respectively) suggests that
it's a network directly connected via some network interface, in this
case the loopback.
The `!' flag indicates that the route should be rejected... I've never
actually seen this used before, but the effect that this will likely have
is to prevent the box from contacting itself using the loopback interface.
Not a particularly useful route to have, as nearly as I can tell. In fact,
if someone can provide a real-world situation where rejecting any route is
useful, I'd like to know it! I can't think of one.
--
"Quis custodiet ipsos custodes?" "Who watches the watchmen?"
-Juvenal, Satires, VI, 347
Derek D. Martin | Senior UNIX Systems/Network Administrator
Arris Interactive | A Nortel Company
[EMAIL PROTECTED] | [EMAIL PROTECTED]
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