OSPF bad packet

[Benoit Chesneau]

OK I see thanks for the feedback. This may be related to the upgrade to freebsd 14 and latest bird 1.15.1 which is compiled now by default with netlink support instead of rtsock. I

I will try the rtsock version to compare.

Benoit

On Monday, April 15th, 2024 at 16:37, Ondrej Zajicek <santiago at crfreenet.org> wrote:

> On Mon, Apr 15, 2024 at 02:22:01PM +0000, Benoit Chesneau wrote:
> 
> > 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 ?
> 
> 
> Hi
> 
> It seems like the OSPF receives its own packets back. There is a check
> that should make them to be silently ignored:
> 
> /* We want just packets from sk->iface. Unfortunately, on BSD we cannot filter
> 
> out other packets at kernel level and we receive all packets on all sockets */
> if (sk->lifindex != sk->iface->index)
> 
> return 1;
> 
> But for some reason it does not work in your case, AFAIK it worked in
> older BSDs. It should be harmless outside of spanning your logs.
> 
> --
> Elen sila lumenn' omentielvo
> 
> Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
> "To err is human -- to blame it on a computer is even more so."