Hi.
I need to setup "one route" to a certain destination network (indeed
it's another LAN, which I want to connect to, i.e. I'm creating a
simple VPN). I have 2 possible gateways:
a) Fast (through an ADSL line via 192.168.7.254. This is a CIPE
connection)
b) Slow (through a RDSI line via 192.168.5.3. This is pure PPP)
The situation I'm looking for is having two real routes to the
destination network (via the fast gateway and the slow one
respectively) but only the first (=fast) one is used in normal
conditions. The second (=slow) one will only be used in case the first
breaks (i.e. failover mode).
I've tried to enter two different routes to the same destination and
it seems not to be permitted:
goliat:/etc/iproute2 # ip route list table roman
192.168.7.254 dev cipcb0 scope link
default via 192.168.5.1 dev eth1
goliat:/etc/iproute2 # ip route add 192.168.1.0/24 via 192.168.7.254
table roman
goliat:/etc/iproute2 # ip route add 192.168.1.0/24 via 192.168.5.3
table roman
RTNETLINK answers: File exists
Nevertheless I've checked the main table and I can see "duplicated"
routes (these were introduced by the "route" command):
goliat:/etc/iproute2 # ip route list
62.22.78.68 via 192.168.5.1 dev eth1
62.22.78.68 via 192.168.5.2 dev eth1
192.168.7.254 dev cipcb0 proto kernel scope link src 192.168.6.254
192.168.5.0/24 dev eth1 proto kernel scope link src 192.168.5.200
192.168.3.0/24 via 192.168.5.3 dev eth1
192.168.2.0/24 via 192.168.5.3 dev eth1
192.168.1.0/24 via 192.168.5.3 dev eth1
192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.200
127.0.0.0/8 dev lo scope link
default via 192.168.5.1 dev eth1
goliat:/etc/iproute2 #
Note the 62.22.78.68 route. Now it is permitted !
Is this last one a multipath route or what am I missing?
Is it possible to reach the failover state I'm looking for? Any
experiences with that?
Another possible case (perhaps it works) would be to set up a
multipath route and use a very high metric for the slow gateway, but
this is not exactly what I want 'cause I want the slow gateway to be
used IF and ONLY IF the fast one is down.
Please, help. Thx in advance.
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** RoMaN SoFt / LLFB **
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