[CentOS] making a route sticky

Fri Aug 5 15:12:44 UTC 2005
Dan Gorman <dgorman1 at mac.com>


On Aug 5, 2005, at 8:06 AM, Aleksandar Milivojevic wrote:

> Is it possible to have a route stick in the kernel, even if device  
> it points to
> goes to roller coaster up and down drive.
> For example.  I have an ADSL modem and am doing VPN over it.   
> There's a route
> needed for VPN added like this:
> ip route add via src
> There are two problems with it:
> a) if ADSL link is down when above command is executed, the route  
> command will
> fail (ppp0 is down, so there's no
> b) if ADSL link is up when above command is executed, but it goes  
> down (and up
> again) later, the route is removed from kernel routing tables
> So, if there are any problems with ADSL link, I need to manually  
> reset my VPN
> setup.
> I could write some monitoring script (and call it from cron) that  
> would check if
> route is present and attempt to readd it if needed, but I'd rather  
> be able to
> have the route either sticky (not removed when interface goes down) or
> automatically reenabled by the kernel when interface goes up again.
> Thanks,
> Aleksandar Milivojevic
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