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Hello!
* I modified this a little bit and added some command to make it clearer. *
I have a problem with a duplicate route entry, when using a pre-installed route
and automatic take-over by the "heartbeat" daemon, which adds an address and
the kernel adds an route automatically.
Maybe anyone has an explanation...
> ip addr
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1514 qdisc pfifo_fast qlen 1000
inet 10.10.20.100/32 scope global eth0
> ip route
127.0.0.0 dev lo scope link
10.10.20.0/24 dev eth0 scope link
default via 10.10.20.1 dev eth0
- -- Now I add a route for my ha net:
> ip route add 10.100.0.0/24 dev eth0 proto kernel scope link
> ip route
127.0.0.0 dev lo scope link
10.10.20.0/24 dev eth0 scope link
10.100.0.0/24 dev eth0 proto kernel scope link
default via 10.10.20.1 dev eth0
- -- The 'heartbeat' will add an address on switch-over:
> ip addr add 10.100.0.1/24 brd 10.100.0.255 dev eth0
ip addr
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1514 qdisc pfifo_fast qlen 1000
inet 10.10.20.100/32 scope global eth0
inet 10.100.0.1/24 brd 10.100.0.255 scope global eth0
> ip route
127.0.0.0 dev lo scope link
10.10.20.0/24 dev eth0 scope link
10.100.0.0/24 dev eth0 proto kernel scope link
10.100.0.0/24 dev eth0 proto kernel scope link src 10.100.0.1
default via 10.10.20.1 dev eth0
My question is:
Why did the kernel add a duplicate routing entry, shouldn't it notice the
existance and avoid this??
Is this a bug of the kernel?
| "Radoslaw Horodniczy" answered:
|
| This is not a bug, as you see there are 2 different routes
Ok, then try this:
> ip route del 10.100.0.0/24 dev eth0 proto kernel scope link
> ip route
127.0.0.0 dev lo scope link
10.10.20.0/24 dev eth0 scope link
10.100.0.0/24 dev eth0 proto kernel scope link src 10.100.0.1
default via 10.10.20.1 dev eth0
Now I removed my manually set route. It succeeds.
If I then try to readd it, it fails. But why?
> ip route add 10.100.0.0/24 dev eth0 proto kernel scope link
RTNETLINK answers: File exists
I thought they are different!?!
Is here any difference I did not see?
If they are not different, why does the kernel not recognize it
(see above) and avoid the duplicate entry?
- --------
Another question:
Why can't I set a route on an interface that is down?
I can set an address, so why not a route?
I there a reason for that?
Example:
> ip link set down dev eth0
> ip addr add 10.100.0.1/24 dev eth0
> ip route add 10.100.0.0/24 dev eth0 proto kernel scope link
RTNETLINK answers: Network is down
- --------
PS: I'm running Linux 2.6.15.1
Regards
Sven Anders
- --
Sven Anders <anders@xxxxxxxxxx> () Ascii Ribbon Campaign
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