Same routing table has been duplicated every time when restarting network

Issue

Setup policy based routing tables as follows;

• /etc/iproute2/rt_tables

10 a
20 b

• /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
TYPE=Ethernet
ONBOOT=yes
NM_CONTROLLED=no
BOOTPROTO=none
IPADDR=192.168.122.241
PREFIX=24
GATEWAY=192.168.122.1
DEFROUTE=yes

• /etc/sysconfig/network-scripts/ifcfg-eth0:1

DEVICE=eth0:1
TYPE=Ethernet
ONBOOT=yes
BOOTPROTO=none
IPADDR=192.168.122.244
PREFIX=24
DEFROUTE=yes
GATEWAY=192.168.122.1

• /etc/sysconfig/network-scripts/route-eth0

192.168.122.0/24 dev eth0 src 192.168.122.241 table a
default via 192.168.122.1 table a

• /etc/sysconfig/network-scripts/route-eth0:1

192.168.122.0/24 dev eth0 src 192.168.122.244 table b
default via 192.168.122.1 table b

• /etc/sysconfig/network-scripts/rule-eth0

from 192.168.122.241 table a

• /etc/sysconfig/network-scripts/rule-eth0:1

from 192.168.122.244 table b

1) After Booting

# ip rule
0:  from all lookup local 
32764:  from 192.168.122.241 lookup a 
32765:  from 192.168.122.244 lookup b
32766:  from all lookup main 
32767:  from all lookup default 

2) After running ''service network restart''

# ip rule
0:  from all lookup local 
32763:  from 192.168.122.241 lookup a 
32764:  from 192.168.122.244 lookup b
32765:  from 192.168.122.244 lookup b    ---> this line repeat
32766:  from all lookup main 
32767:  from all lookup default 

3) Running ''service network restart'' again

# ip rule
0:  from all lookup local 
32762:  from 192.168.122.241 lookup a 
32763:  from 192.168.122.244 lookup b 
32764:  from 192.168.122.244 lookup b    ---> this line repeat
32765:  from 192.168.122.244 lookup b    ---> this line repeat again
32766:  from all lookup main 
32767:  from all lookup default