04-16-2009
permanently add static route
I have a machine with an interface that has two different addresses on CentOS 5
eth0: 10.20.21.77
eth0:1 141.218.1.221
If I issue this command I get the result I'm looking for.
/sbin/route add -net 141.218.1.0 netmask 255.255.255.0 gw 10.20.21.77
ip route show dev eth0
141.218.1.0/24 via 10.20.21.77 scope link
141.218.1.0/24 proto kernel scope link src 141.218.1.221
10.20.21.0/24 proto kernel scope link src 10.20.21.221
169.254.0.0/16 scope link
default via 10.20.21.1
Now I reboot the machine and the route goes away, I've tried creating a file in /etc/sysconfig/network-scripts/route-eth0 that contains
141.218.1.0/24 via 10.20.21.77
Also tried:
141.218.1.0/24 via 10.20.21.77 dev eth0
On a reboot it looks like this...
ip route show dev eth0
141.218.1.0/24 proto kernel scope link src 141.218.1.221
10.20.21.0/24 proto kernel scope link src 10.20.21.77
169.254.0.0/16 scope link
default via 10.20.21.1
Running ifup-routes by hand results with:
./ifup-routes eth0
RTNETLINK answers: File exists
Thanks for any help.
Last edited by beaker457; 04-16-2009 at 11:52 AM..
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LEARN ABOUT MINIX
tc-route
Route classifier in tc(8) Linux Route classifier in tc(8)
NAME
route - route traffic control filter
SYNOPSIS
tc filter ... route [ from REALM | fromif TAG ] [ to REALM ] [ classid CLASSID ] [ action ACTION_SPEC ]
DESCRIPTION
Match packets based on routing table entries. This filter centers around the possibility to assign a realm to routing table entries. For
any packet to be classified by this filter, a routing table lookup is performed and the returned realm is used to decide on whether the
packet is a match or not.
OPTIONS
action ACTION_SPEC
Apply an action from the generic actions framework on matching packets.
classid CLASSID
Push matching packets into the class identified by CLASSID.
from REALM
fromif TAG
Perform source route lookups. TAG is the name of an interface which must be present on the system at the time of tc invocation.
to REALM
Match if normal (i.e., destination) routing returns the given REALM.
EXAMPLES
Consider the subnet 192.168.2.0/24 being attached to eth0:
ip route add 192.168.2.0/24 dev eth0 realm 2
The following route filter will then match packets from that subnet:
tc filter add ... route from 2 classid 1:2
and pass packets on to class 1:2.
NOTES
Due to implementation details, realm values must be in a range from 0 to 255, inclusive. Alternatively, a verbose name defined in
/etc/iproute2/rt_realms may be given instead.
SEE ALSO
tc(8), ip-route(8)
iproute2 21 Oct 2015 Route classifier in tc(8)