> On Wed, 24 Feb 1999, Andrew B. Cramer wrote:
>
> > > We are having a major problem with our second PPP link to our ISP, in that
> > > no data can get across the link; we have just noticed that we cannot ping
> > > the local address. Instead, any packets sent to the interface disappear,
> > > and are registered by ifconfig as RX errors:
[ snip ]
> Well, yes, but I don't think that our local ethernet is really relevant,
> is it? Our links to the Internet are through two PPP lines... The problem
> still occurs on the second link even when the network card is removed from
> our Linux server.
When you ping the local address of an interface, it doesn't go to the
interface driver. It is shunted to the loopback device. So pinging a ppp device
or other adapter only verifies two things: that the device is up and
configured with the address you are trying to ping, and that the loopback
device has been configured, and there is a route to it.
If your loopback device or route are down, you get ``network unreachable''
errors from ping if you ping the local address of any network adapter.
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