It appears nothing is wrong with my code... it's just red hat firewalld
that is blocking ospf...
On Thursday, 8 June 2017 13:37:27 UTC+1, brylant wrote:
>
> Hi,
>
> I'm trying to capture OSPF hello packets like this:
>
> ens192, err := net.InterfaceByName("ens192")
> if err != nil {
> return err
> }
> c, err := net.ListenPacket("ip4:89", "0.0.0.0") // ipv4 proto 89,
> all local interfaces
> if err != nil {
> return err
> }
> defer c.Close()
>
> p := ipv4.NewPacketConn(c)
> if err != nil {
> return err
> }
>
> allSPFRouters := net.ParseIP("224.0.0.5")
> if err := p.JoinGroup(ens192, &net.IPAddr{IP: allSPFRouters});
> err != nil {
> return err
> }
>
> if err := p.SetControlMessage(ipv4.FlagDst|ipv4.FlagSrc|ipv4.
> FlagInterface, true); err != nil {
> return err
> }
>
> b := make([]byte, 64)
> for {
> n, cm, src, err := p.ReadFrom(b)
> _ = n
> if err != nil {
> return err
> }
> if cm.Dst.IsMulticast() {
> if cm.Dst.Equal(allSPFRouters) {
> fmt.Printf("OSPF hello received from %v\n"
> , src)
> } else {
> // ignore/discard
> fmt.Printf("Received packet from: %v to
> %v\n", src, cm.Dst)
> continue
> }
> }
> }
> return errors.New("I should never reach this point")
>
> but I can only see locally generaetd packets (ie. ospf process running on
> the same machine) and not a trace of remote hellos (I can see them in
> tcpdump though)..
>
> Any ideas what's wrong with my code...?
>
> Thanks,
>
>
>
>
>
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