Re: [lwip-users] Multicast packet will drop in ip.c

[Bandu]

thanks David.

Is that also apply for UPnP, i mean get blocked, which multicast and, i also think, got source IP address so that client can unicast back to the source?

Regards,

 

Bandu

On Tue, Jun 1, 2010 at 11:06 PM, David Empson <address@hidden> wrote:

The code you quoted dropping all packets which have a broadcast or multicast SOURCE address, which is illegal except in special conditions such as DHCP. Refer to RFC1122, which is mentioned in ip.c just above the bit you quoted.

 

LWIP can receive packets where the DESTINATION address is broadcast or multicast.

 

----- Original Message -----

From: Bandu

To: Mailing list for lwIP users

Sent: Tuesday, June 01, 2010 11:49 PM

Subject: [lwip-users] Multicast packet will drop in ip.c

Hi,

 

I would like to check lwip 1.3.2 implementation about multicast/broadcast implementation.

even though, IP_SOF_BROADCAST_RECV & IP_SOF_BROADCAST defined, ip layer will drop all multicast and broadcast packet except DHCP protocol. Is this a bug or intended implementation?

// In ip.c

  if (check_ip_src)
  {  if ((ip_addr_isbroadcast(&(iphdr->src), inp)) ||
         (ip_addr_ismulticast(&(iphdr->src)))) {
      /* packet source is not valid */
      LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: packet source is not valid.\n"));
      /* free (drop) packet pbufs */
      pbuf_free(p);
      IP_STATS_INC(ip.drop);
      snmp_inc_ipinaddrerrors();
      snmp_inc_ipindiscards();
      return ERR_OK;
    }
  }

Regards,

--
Bandu
address@hidden

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Bandu
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