[CentOS] Is there a way to save the routing table permanently?
rob.townley at gmail.com
Fri Aug 22 19:13:51 UTC 2008
On Fri, Aug 22, 2008 at 12:44 PM, Les Mikesell <lesmikesell at gmail.com>wrote:
> Florin Andrei wrote:
>> ABBAS KHAN wrote:
>>> I'm adding the default gateway to the route through "route add default gw
>>> 10.10.10.10 <http://10.10.10.10>" which is also shown in "route -n" but
>>> the problem is that as soon as I restart the network through
>>> /etc/init.d/network restart; the route sets to default one...!
>>> SO, my question is there any way to save the modified route permanently
>>> by hardcoding the changes?
>> It would be very nice if the init.d script would allow the sysadmin to do
>> something like "service network saveroutes". I always thought that would be
>> a neat feature.
> Routes only work when you can reach the next hop. That is, if you try to
> add a route through an interface that is not up, the command will fail and
> the route will not be added. If you want a route to be added when an
> interface comes up, there is already a place to do that. However, as others
> have pointed out you shouldn't expect multiple concurrent default routes to
> do something useful - but if you have multiple interfaces you can configure
> them both to add default routes and bring only one up at a time.
> Les Mikesell
> lesmikesell at gmail.com
;Are you suggesting the following?
;assume eth1 is a better ISP than eth0
ISP on eth1 goes down
automagically detect down ISP on eth1, so
automagically detect ISP back up on eth1, so
ifdown eth0 again
;That isn't gonna fly.
Looks like nate pointed out the right journal article and looks very
promising. Will let you know how it goes.
"Source-based routing capabilities are common on high end networking gear,
but they rarely are seen or utilized in server environments. Linux has
excellent but poorly understood source-based routing support. The whole
universe of advanced Linux routing and traffic shaping is well described at
ip rules and ip route priority are key.
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