[Xorp-users] [xorp-users] OSPFv2 problem: no matching neighbor found

[Yue Li]

Hi, Atanu
I have figured it out. Thank you very much.

2008/1/8, Atanu Ghosh <atanu at icsi.berkeley.edu>:
> Hi,
>
> In OSPF some packets such as the hello packets are multicast and other
> packets such as the data description packets are unicast. The source
> address in a packet is used to demultiplex a packet and associate it
> with a neighbour. I notice from the output of "show ospf4 neighbour"
> that you seem to be using tunnels. What may be happening is that the
> hello packets that are multicast are being received with the orignal
> source address provided by OSPF, the source address of unicast packets
> may be changed by the tunnel, which could explain why they are not
> recognised.
>
> Try running tcpdump on router A and check the source addresses of
> received packets.
>
>         Atanu.
>
> >>>>> "Yue" == Yue Li <yueli.m at gmail.com> writes:
>
>     Yue> ---------- Forwarded message ----------
>     Yue> From: Yue Li <yueli.m at gmail.com>
>     Yue> Date: 2008-1-6 ÉÏÎç1:51
>     Yue> Subject: Re: [Xorp-users] [xorp-users] OSPFv2 problem: no matching
>     Yue> neighbor found
>     Yue> To: atanu at icsi.berkeley.edu
>
>
>     Yue> Hi,
>     Yue> Thanks for your reply.
>     Yue> The topology used is as follow:
>
>     Yue> +---+ (10.10.0.9)       (10.10.0.10)+---+
>     Yue> | A |----------------------------------------- | B |
>     Yue> +---+                                         +---+
>     Yue> |(10.10.0.1)                                |  (10.10.0.6)
>     Yue> |                                               |
>     Yue> |                                               |  (10.10.0.5)
>     Yue> |                           (10.10.0.2) +----+
>     Yue> - --------------------------------------------| C |
>     Yue> +----+
>
>     Yue> Router A (id: 10.10.0.1), Router B (id: 10.10.0.10) and Router C (id:
>     Yue> 10.10.0.5),
>     Yue> each has two neighbors.
>
>     Yue> On Router A:
>     Yue> show ospf4 neighbor:
>     Yue> Address         Interface             State      ID              Pri  Dead
>     Yue> 10.10.0.2        tun0/tun0              ExStart   10.10.0.5        128    31
>     Yue> 10.10.0.10       tun1/tun1              ExStart   10.10.0.10       128    33
>
>     Yue> show ospf4 database:
>     Yue> OSPF link state database, Area 0.0.0.0
>     Yue> Type       ID               Adv Rtr           Seq      Age  Opt  Cksum  Len
>     Yue> Router  *10.10.0.1        10.10.0.1        0x80000001    78  0x2  0xad78  48
>
>
>     Yue> 2008/1/4, Atanu Ghosh <atanu at icsi.berkeley.edu>:
>     >> Hi,
>     >>
>     >> The XORP OSPF will not accept data description packets from an unknown
>     >> neighbour (this is a protocol requirement).
>     >>
>     >> Can you send the output of the "show ospf4 neighbor" command?
>     >>
>     >> Atanu.
>     >> .
>     >> >>>>> "Yue" == Yue Li <yueli.m at gmail.com> writes:
>     >>
>     Yue> Hi, everyone I am doing some experiment with ospfv2. The
>     Yue> problem is xorp is keep saying "no matching neighbor found"
>     Yue> when receiving database description packets.  When I show ospf
>     Yue> database through xorpsh, there is nothing.
>     >>
>     Yue> Can you give me any clues?  Thanks!
>     >>
>     Yue> _______________________________________________ Xorp-users
>     Yue> mailing list Xorp-users at xorp.org
>     Yue> http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/xorp-users
>     >>
>
>