There are three NICs on my linux(kernel 2.4.13), two of
them are for adsl line(two uplinks) and the other is for NAT.
Here is my network.
+-------+ +---------+
| ISP | | ISP |
+-------+ +---------+
10.10.10.254 20.20.20.254
\ /
\ /
ppp0: 10.10.10.1 ppp1: 20.20.20.1
+------------+
| Linux |
+------------+
eth2: 172.31.0.1/16
and I tried as:
# ip route add 10.10.10.254 dev ppp0 table 200
# ip route add default via 10.10.10.254 dev ppp0 table 200
# ip route add 20.20.20.254 dev ppp1 table 100
# ip route add default via 20.20.20.254 dev ppp1 table 100
# ip route add 10.10.10.254 src 10.10.10.1 dev ppp0
RTNETLINK answers: File exists ---> error 1
# ip route add 20.20.20.254 src 20.20.20.1 dev ppp1
RTNETLINK answers: File exists
# ip route add default scope global nexthop via 10.10.10.254 nexthop
via 20.20.20.254
RTNETLINK answers: Network is unreachable ----> error 2
Why the second error is occured?
Here is my route table;
# ip route show
10.10.10.254 dev ppp0 proto kernel scope link src 10.10.10.1
20.20.20.254 dev ppp1 proto kernel scope link src 20.20.20.1
172.31.0.0/16 dev eth2 proto kernel scope link src 172.31.0.1
127.0.0.0/8 dev lo scope link
default via 10.10.10.254 dev ppp0
Why I can't set up equal cost multipath default route?
> Here is my network. > > > +-------+ +---------+ > | ISP | | ISP | > +-------+ +---------+ > 10.10.10.254 20.20.20.254 > \ / > \ / > ppp0: 10.10.10.1 ppp1: 20.20.20.1 > +------------+ > | Linux | > +------------+ > eth2: 172.31.0.1/16 > Why I can't set up equal cost multipath default route? you can't without special arrangements with the ISPs. IMHO, if you want to do some kind of load balancing, you should do some SNAT balancing. Jerome Petazzoni <skaya at enix dot org> -- 'They come back to the mountains to die,' said the King. 'They live in Ankh-Morpork.' (The Fifth Elephant)