OSPF bad packet

[Benoit Chesneau]

Hi Ondrej,

Not sure I undersand, these are the IPs of this router itself:

```
root at gw0:~ # ifconfig vlan600
vlan600: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 9000
        description: backbone
        options=1c680703<RXCSUM,TXCSUM,TSO4,TSO6,LRO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6,MEXTPG,TXTLS4,TXTLS6>
        ether fa:9b:80:06:d7:f9
        inet 198.19.4.33 netmask 0xffffffe0 broadcast 198.19.4.63
        inet6 fe80::f89b:80ff:fe06:d7f9%vlan600 prefixlen 64 scopeid 0x5
        inet6 2001:7f8::2:103::1 prefixlen 64
        groups: vlan
        vlan: 600 vlanproto: 802.1q vlanpcp: 0 parent interface: mce0
        media: Ethernet 25GBase-SR <full-duplex,txpause>
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
```


I didn't find equivalent router id on the network. I also tried to uniquely change the ID but the same error appears. Is there anything I could do to debug this issue ? 

OSPF configuration (I edited IPV6 address):

```
define ospf_v4_routes = [  198.19.0.0/16 ];
define ospf_v6_routes = [ 2001:7f8:2:100::/56 ];

filter ospf_export {
        if (net.type = NET_IP4 && net ~ [ 0.0.0.0/0 ]) then accept;
        if (net.type = NET_IP6 && net ~ [ ::0/0 ]) then accept;

        ospf_metric1 = 200; unset(ospf_metric2);
        reject;
}

filter ospf_import {
        if (net.type = NET_IP4 && net ~ ospf_v4_routes) then accept;
        if (net.type = NET_IP6 && net ~ ospf_v6_routes) then accept;
        reject;
}

protocol ospf v2 ospfv4 {
   debug all;
   ipv4 {
        import filter ospf_import;
        export filter ospf_export;
  };
 area 0.0.0.0 {
  interface "lo1" { stub yes; };
  interface "vlan600" {
   type ptp;
   cost 15;
   bfd on;
  };
 };
}

protocol ospf v3 ospfv6 {
  ipv6 {
        import filter ospf_import;
        export filter ospf_export;
  };
 area 0 {
  interface "lo1" { stub yes; };
  interface "vlan600" {
   type ptp;
   cost 15;
   bfd off;
  };
 };
}

```


Benoit
On Monday, April 15th, 2024 at 01:12, Benoit Chesneau <benoitc at enki-multimedia.eu> wrote:

> Hi,
> 
> I have installed latest bird 2.15.1 with ntet link support on Freebsd and I contunuously get the following messages:
> 
> ```
> 2024-04-14 23:09:12.386 <RMT> ospfv6: Bad packet from fe80::f89b:80ff:fe06:d7f9 via vlan600 - my own router ID (0)2024-04-14 23:09:12.386 <RMT> ospfv4: Bad packet from 198.19.4.33 via vlan600 - my own router ID (0)
> 2024-04-14 23:09:12.386 <RMT> ospfv6: Bad packet from fe80::f89b:80ff:fe06:d7f9 via vlan600 - my own router ID (0)
> 2024-04-14 23:09:12.386 <RMT> ospfv4: Bad packet from 198.19.4.33 via vlan600 - my own router ID (0)
> 2024-04-14 23:09:18.155 <TRACE> ospfv4: HELLO packet received from nbr 198.19.0.2 on vlan600
> 2024-04-14 23:09:22.382 <TRACE> ospfv4: HELLO packet sent via vlan600
> 2024-04-14 23:09:22.383 <RMT> ospfv6: Bad packet from fe80::f89b:80ff:fe06:d7f9 via vlan600 - my own router ID (0)
> 2024-04-14 23:09:22.383 <RMT> ospfv4: Bad packet from 198.19.4.33 via vlan600 - my own router ID (0)
> 2024-04-14 23:09:22.383 <RMT> ospfv6: Bad packet from fe80::f89b:80ff:fe06:d7f9 via vlan600 - my own router ID (0)
> 2024-04-14 23:09:22.383 <RMT> ospfv4: Bad packet from 198.19.4.33 via vlan600 - my own router ID
> ```
> 
> What could be the reason for such error? MTU looks fine, and I can retrieve the route via osf.
> 
> 
> Benoît