[Xorp-users] Xorp does not see ospf hello packets in a gre

Ben Greear greearb at candelatech.com
Thu May 12 16:32:04 PDT 2011


On 05/12/2011 10:30 AM, Ricardo Sepulveda wrote:
>
>
> Thanks for the reply.
>
> I am using:
> Fedorea Core 13 2.6.34.8-68
> Xorp 1.8.3 release 1. fc13
>
> There was nothing odd that I saw in the system logs. I cant grab out the Xorp logs at the moment but as it ran Xorp I did not see any outstanding errors.
> I did run wireshark and I could see the hello's comming in over the gre interface. Thats how I know the packets are comming in.  Looking at the ospf4 details in Xorp I could see the dead timer counting down while on the Cisco router I could see the timer reset every 10 seconds.
>
> Using the same exact configuraton outside of the gre/dmvpn tunnle everything works just fine.

There might be some issue with FEA dealing with tunnels.  You could try adding
some debugging to it's packet reception logic to see if it's even getting
packets.  I think fea/data_plane/io/io_tcpudp_socket.cc might be a good
place to start, but it's been a while since I poked around in that code.

If you can reproduce the problem with xorp <-> xorp, and provide some good
details on how to configure the gre/dmvpn tunnel in Linux, then
I or someone else might get time to debug it.

Thanks,
Ben


>
>
> Ricardo
>
>
>
>
>
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> Sent: Wednesday, May 11, 2011 12:00 PM
> To: xorp-users at xorp.org
> Subject: EXT :Xorp-users Digest, Vol 62, Issue 6
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> Today's Topics:
>
>    1. Xorp does not see ospf hello packets in a gre tunnel
>        (Ricardo Sepulveda)
>    2. Re: Xorp does not see ospf hello packets in a gre    tunnel
>        (Ben Greear)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 10 May 2011 15:40:49 -0700 (PDT)
> From: Ricardo Sepulveda<reesesoliarie at yahoo.com>
> Subject: [Xorp-users] Xorp does not see ospf hello packets in a gre
>      tunnel
> To: "xorp-users at xorp.org"<xorp-users at xorp.org>
> Message-ID:<70710.19958.qm at web30803.mail.mud.yahoo.com>
> Content-Type: text/plain; charset=utf-8
>
> Hi Everyone,
>
> I am having issues with Xorp not seeing the hello packets from a neighbored Cisco router over a gre opennhrp/dmvpn tunnel.
>
> In my setup the Xorp and Cisco router neighbor up fine over the gre tunnel (ethernet)?and allow data to pass across.
> The issue is that Xorp will not see any of the hello packets that come across the tunnel from the Cisco router after the successful convergence.? Data moves until the dead timer runs down. It then starts back up after the systems re-converge. ?
> ?
> The Cisco accepts the hello's from Xorp over the tunnel and I can see the hello's come into the Xorp interface from the Cisco.?
> ?
> As a test I?ve played with the hello intervals and router dead intervals on the Cisco and Xorp systems but it has made no difference.
>
> With no tunnels the systems converge and the dead timers update regularly.
>
> I have tested this in Quaga but I do not have this issue with the hello's.?
> ?
> Any ides on what the issue might be?
> ?
> Thanks
> Ricardo S.
>
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 10 May 2011 15:50:26 -0700
> From: Ben Greear<greearb at candelatech.com>
> Subject: Re: [Xorp-users] Xorp does not see ospf hello packets in a
>      gre    tunnel
> To: Ricardo Sepulveda<reesesoliarie at yahoo.com>
> Cc: "xorp-users at xorp.org"<xorp-users at xorp.org>
> Message-ID:<4DC9C132.3060001 at candelatech.com>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> On 05/10/2011 03:40 PM, Ricardo Sepulveda wrote:
>> Hi Everyone,
>>
>> I am having issues with Xorp not seeing the hello packets from a neighbored Cisco router over a gre opennhrp/dmvpn tunnel.
>>
>> In my setup the Xorp and Cisco router neighbor up fine over the gre tunnel (ethernet) and allow data to pass across.
>> The issue is that Xorp will not see any of the hello packets that come across the tunnel from the Cisco router after the successful convergence.  Data moves until the dead timer runs down. It then starts back up after the systems re-converge.
>>
>> The Cisco accepts the hello's from Xorp over the tunnel and I can see the hello's come into the Xorp interface from the Cisco.
>>
>> As a test I?ve played with the hello intervals and router dead intervals on the Cisco and Xorp systems but it has made no difference.
>>
>> With no tunnels the systems converge and the dead timers update regularly.
>>
>> I have tested this in Quaga but I do not have this issue with the hello's.
>>
>> Any ides on what the issue might be?
>
> Please let us know the OS, kernel version, xorp version, and perhaps the xorp
> logs...
>
> You might try poking through the logs yourself to see if you see anything interesting...
>
> You could also sniff the interface to make sure pkts are being properly received by
> the OS.
>
> Thanks,
> Ben
>
>>
>> Thanks
>> Ricardo S.
>>
>> _______________________________________________
>> Xorp-users mailing list
>> Xorp-users at xorp.org
>> http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/xorp-users
>
>


-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com



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