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Make added routes permanent

Posted on 2010-11-10
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Last Modified: 2012-06-27
I have added some routes to make my networked linux box run a special configuration.  I entered the routes in /etc/rc.local so they are added at startup.

I seem to be having issues where the routes are lost after some time.

What files do I need to add these routes to so they will be permanent?

Running Centos 5.5

Here is what I added:

ip route add 192.168.1.0/24 via 192.168.1.1 table 192
ip route add default via 192.168.1.1 table 192
ip rule add from 192.168.1.0/24 table 192
ip route add 10.0.0.0/24 via 10.0.0.1 table 10
ip route add default via 10.0.0.1 table 10
ip rule add from 10.0.0.0/24 table 10

I would also like to keep the default routes...
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.0.0.0        *               255.255.255.0   U     0      0        0 eth1
192.168.1.0     *               255.255.255.0   U     0      0        0 eth0
169.254.0.0     *               255.255.0.0     U     0      0        0 eth1
default         192.168.1.1     0.0.0.0         UG    0      0        0 eth0


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Question by:savone
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Author Comment

by:savone
ID: 34108303
Also, it looks as if I am losing my routes when the DHCP lease is renewed... Why is this?
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by:Michael W
ID: 34108372
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Expert Comment

by:Michael W
ID: 34108430
Also, found a forum thread using the /etc/sysconfig/network-scripts/rule-ethX method...

http://www.centos.org/modules/newbb/viewtopic.php?viewmode=thread&topic_id=8153&forum=40&post_id=25805
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Author Comment

by:savone
ID: 34108473
Ok this is the link that led me to the answer:
http://sysadminsjourney.com/content/2009/04/15/doing-simple-source-policy-routing-centos

So why is DHCP killing my routes?  Anyone?

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Expert Comment

by:Michael W
ID: 34108915
Is the server acting as a DHCP client or a DHCP server?

If DHCP client, what do you currently have set (listed) in the following files:
 - /etc/sysconfig/network-scripts/ifcfg-ethX (X = 0, 1, etc)
 - /etc/sysconfig/network-scripts/route-ethX (X = 0, 1, etc)

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Expert Comment

by:Insoftservice
ID: 34109269
Hi ,
I agree with @mwecomputers.
Please let us know whether the dhcp server and client are assigned to behave as dhcp
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Author Comment

by:savone
ID: 34110874
The server is a DHCP client...

# cat /etc/sysconfig/network-scripts/ifcfg-eth0
# ADMtek NC100 Network Everywhere Fast Ethernet 10/100
DEVICE=eth0
BOOTPROTO=dhcp
HWADDR=00:04:5A:7C:ED:38
ONBOOT=yes

# cat /etc/sysconfig/network-scripts/ifcfg-eth1
# Broadcom Corporation NetXtreme BCM5751 Gigabit Ethernet PCI Express
DEVICE=eth1
BOOTPROTO=dhcp
HWADDR=00:13:72:BB:2B:9C
ONBOOT=yes
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Accepted Solution

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savone earned 0 total points
ID: 34129411
For anyone reading this in the future this is how I resolved the issue:


1) Add new table to /etc/iproute2/rt_tables
echo -e "200\tNet" >> /etc/iproute2/rt_tables

2)Add new route to interface
echo "default table Net via 10.0.0.1" > /etc/sysconfig/network-scripts/route-eth1

3) Add new rule to interface
echo "from 10.0.0.2 table Net" > /etc/sysconfig/network-scripts/rule-eth1
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Author Closing Comment

by:savone
ID: 34162508
I was unable to get an accurate answer from experts.  Found the solution on my own and would like to share it with the community.
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