[LARTC] Problem with duplicate route entry

From: Sven Anders <anders@anduras.de>
To: lartc@vger.kernel.org
Subject: [LARTC] Problem with duplicate route entry
Date: Thu, 02 Mar 2006 19:47:23 +0000	[thread overview]
Message-ID: <44074BCB.1000809@anduras.de> (raw)

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Hello!

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
> 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  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  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?

Regards
 Sven Anders

- --
 Sven Anders <anders@anduras.de>                 () Ascii Ribbon Campaign
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 ANDURAS service solutions AG
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