[Olsr-users] Flushing routes when an interface gets removed

[Henning Rogge]

I am still in London at the IETF... might look at it when I am back in the
hotel.

Henning
On Mar 6, 2014 5:24 PM, "Ferry Huberts" <(spam-protected)> wrote:

>
>
> On 06/03/14 17:52, Michael Rack wrote:
>
>> Hi!
>>
>> I use olsrd v0.6.6 with two interfaces:
>>
>>      * tap0 = VPN Tunnel over DSL for Backup reasons
>>      * eth0 = 1 GBit Ethernet Port
>>
>> The tap0-Interface is installed static via (ip tuntap add dev tap0 mode
>> tap).
>> Routes via tap0 are devaluated (LinkQualityMult default 0.2), so eth0 is
>> most the preference.
>>
>> Now the strange behavior:
>>
>> When the tap0-Interface get up and running, olsrd adds the interface
>> "olsrd[28954]: Adding interface tap0". The additional routes get
>> inserted and the internal routes will be calculated. So far no problem,
>> and just as wanted.
>>
>> But when i shutdown the VPN-Link (there are no routes via tap0 active)
>> the complete routing table gets flushed. So i have a short takeout up to
>> 5 seconds.
>>
>> The LogFile says: "olsrd[28954]: Removing interface vpn01". Thats ok,
>> but why get all routes via eth0 also flushed?
>>
>
> It shouldn't.
> Henning, ideas?
>
>
>> ------------------------
>> VPN IS ACTIVE:
>>
>> ~ # ip route show table default
>> default via ***.***.***.*** dev eth0 metric 2 onlink
>>
>> ~ # ip route show table oslr | grep 'tap0'
>> {0 routes}
>>
>> ~ # ip route show table oslr | grep 'eth0'
>> {88 routes}
>>
>>
>> ------------------------
>> SHUTDOWN VPN:
>>
>> ~ # ip route show table default
>> {0 routes}
>>
>> ~ # ip route show table oslr | grep 'tap0'
>> {0 routes}
>>
>> ~ # ip route show table oslr | grep 'eth0'
>> {0 routes}
>>
>> after 5 seconds, the last commands return 88 inserted routes.
>>
>> ------------------------
>> Log-File /var/log/messages
>>
>> Mar  6 17:34:48 myvpnrouter vtund[29019]: VTun client ver 3.X 09/18/2013
>> started
>> Mar  6 17:34:48 myvpnrouter vtund[29019]: Connecting to 80.255.15.136
>> Mar  6 17:34:48 myvpnrouter vtund[29019]: Session
>> myvpnrouter-dsl-backup[xxx.xxx.xxx.xxx] opened
>> Mar  6 17:34:48 myvpnrouter olsrd[28954]: Writing '0' (was 0) to
>> /proc/sys/net/ipv4/conf/vpn01/send_redirects
>> Mar  6 17:34:48 myvpnrouter olsrd[28954]: Writing '0' (was 0) to
>> /proc/sys/net/ipv4/conf/vpn01/rp_filter
>> Mar  6 17:34:48 myvpnrouter olsrd[28954]: Adding interface vpn01
>> Mar  6 17:34:48 myvpnrouter vtund[29019]: UDP connection initialized
>> ......
>> Mar  6 17:41:40 myvpnrouter vtund[29019]: Closing connection
>> Mar  6 17:41:40 myvpnrouter vtund[29019]: Session
>> myvpnrouter-dsl-backup[xxx.xxx.xxx.xxx] closed
>> Mar  6 17:41:40 myvpnrouter vtund[29019]: Exit
>> Mar  6 17:41:41 myvpnrouter olsrd[28954]: Removing interface vpn01
>>
>>
>>
>> Why is olsrd flushing all routes when a interface gets removed?
>>
>>
>>
>> Liebe Grüße aus Freilassing,
>>
>> Michael Rack
>> RSM Freilassing
>>
>>
>>
> --
> Ferry Huberts
>
> --
> Olsr-users mailing list
> (spam-protected)
> https://lists.olsr.org/mailman/listinfo/olsr-users
>
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