Rob Townley wrote:
Routes only work when you can reach the next hop. That is, if you
try to add a route through an interface that is not up, the command
will fail and the route will not be added. If you want a route to
be added when an interface comes up, there is already a place to do
that. However, as others have pointed out you shouldn't expect
multiple concurrent default routes to do something useful - but if
you have multiple interfaces you can configure them both to add
default routes and bring only one up at a time.
;Are you suggesting the following?
;assume eth1 is a better ISP than eth0
ifdown eth0
ifup eth1
ISP on eth1 goes down
automagically detect down ISP on eth1, so
ifdown eth1
ifup eth0
automagically detect ISP back up on eth1, so
ifdown eth0 again
;That isn't gonna fly.
The 'right' way to use multiple ISP's is to configure BGP routing with
all of them so you learn the best routes to any destination. However
that is non-trivial to set up and maintain and requires a large block of
public IP addresses.
I haven't read the whole thread here - what problem are you trying to solve?
--
Les Mikesell
lesmikesell@xxxxxxxxx
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