[quagga-users 14752] Re: Problem with Init/DROther

I've found something.

14:15:25.434021 IP (tos 0xc0, ttl 1, id 14445, offset 0, flags [none], proto OSPF (89), length 68)
    10.255.240.45 > ospf-all.mcast.net: OSPFv2, Hello, length 48
        Router-ID 10.0.17.253, Backbone Area, Authentication Type: none (0)
        Options [External]
          Hello Timer 1s, Dead Timer 3s, Mask 0.0.0.0, Priority 1
          Neighbor List:  <-----------
            10.255.240.0
14:15:25.665733 IP (tos 0xc0, ttl 1, id 18804, offset 0, flags [none], proto OSPF (89), length 64)
    10.255.240.44 > ospf-all.mcast.net: OSPFv2, Hello, length 44
        Router-ID 10.255.240.0, Backbone Area, Authentication Type: none (0)
        Options [External]
          Hello Timer 1s, Dead Timer 3s, Mask 0.0.0.0, Priority 1


The Site Router does recognice the neighbour in the neighbor list, but not the Datacenter Router the Site Router??


Mit freundlichen Grüßen
Niclas Müller
Müller + Wollnowski GbR
 

 
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-----Original Message-----
From: Niclas Müller 
Sent: Thursday, August 10, 2017 1:26 PM
To: 'Mikael Abrahamsson' <swmike-uVNFFiCRr/[email protected]>
Cc: quagga-users-UOy77sIEA+cAd7ICUelF/[email protected]
Subject: RE: [quagga-users 14745] Problem with Init/DROther

I've changed the mtu size of my ovpn config to 1440 and added fragment 1400 on client and server, but without any help.
Problems is not solved. I was thinking about the fact that i do have only interfaces that could be shutdown. From my CCNA i have an clue that it could be nessesary to have an lo0 interface in the ospf process that can not be shutdowned ? 

Mit freundlichen Grüßen
Niclas Müller
Müller + Wollnowski GbR
 

 
FON   +49 (231) 58 69 564 - 6
FAX    +49 (231) 58 69 564 - 8
MOB  +49 (176) 35 41 8735

-----Original Message-----
From: Mikael Abrahamsson [mailto:swmike-uVNFFiCRr/[email protected]]
Sent: Thursday, August 10, 2017 12:57 PM
To: Niclas Müller <[email protected]>
Cc: quagga-users-UOy77sIEA+cAd7ICUelF/[email protected]
Subject: Re: [quagga-users 14745] Problem with Init/DROther

On Thu, 10 Aug 2017, Niclas Müller wrote:

> I don`t get the problem, cause it is not everytime. Sometimes is goes 
> away with the time but this is Not an solution. I would be very 
> pleased if someone could help me...

One problem that can cause this is MTU blackhole (1500 byte packets are dropped, for instance 1480 or 1460 packets are not).

Try adding "fragment 1400" to your OpenVPN configuration and see if that helps.

-- 
Mikael Abrahamsson    email: swmike-uVNFFiCRr/[email protected]