[CentOS] making a route sticky

[manuel bertrand]

Also check:
/etc/ppp/ip-down.local
/etc/ppp/ip-up.local


Dan Gorman wrote:

> Yes,
>   /etc/sysconfig/static-routes
>
>
> Regards,
> Dan
> 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 192.168.1.0/24 via 1.2.3.4 src 192.168.2.1
>>
>> 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 1.2.3.4)
>>
>> 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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