It works when you point a static default an ethernet interface (or any LAN
interface, for that matter) because the gateway router will answer the ARP.
The downside here is, that your router has no next-hop IP address
configured in the default static route statement to arp for. So what does
he ARP for? Whatever is in the "destination IP address" field of _EACH_ IP
packet forwarded to your gateway router using the default route. How big
is YOUR router's ARP cache? ;-) Seriously, in a large network with lots
of internet usage, this can use up a router's entire free RAM very quickly.
ARP is not an issue with point-to-point links. The layer-two address is
the same on each side, so there's no need to ARP. So it is perfectly safe
to point a default route at a serial interface.
Pamela
At 12:01 PM 12/29/00 -0600, you wrote:
>That is the rule. I will say that when there was only one device on the
>ethernet I have done it accidently and it worked though.
>
>andy
>
>On Fri, 29 Dec 2000, Stull, Cory wrote:
>
> >
> > I know I'm showing my ignorance here but I'm tired of trying to find the
> > answer on CCO. Must be looking in the wrong places.
> >
> >
> > I just saw a Boson question asking about ip route 0.0.0.0 0.0.0.0 int
> > ethernet0
> >
> >
> > I thought you could only point static routes like that out of point to
> point
> > interfaces? For example: ip route 0.0.0.0 0.0.0.0 int ser0
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