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
m.bandu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

_______________________________________________
lwip-users mailing list
lwip-users-qX2TKyscuCcdnm+yROfE0A@public.gmane.org
http://lists.nongnu.org/mailman/listinfo/lwip-users

Yes. and thank for the help.

 HELLO
what is this term denotes in socket.h file "LWIP_COMPAT_SOCKETS  and  LWIP_POSIX_SOCKETS_IO_NAMES"

in function >>lwip_recv(int s, void *mem, int len, unsigned int flags);
what shoud b the value of flag..what does this mean?


when to use read(),write() and close()  functions?
when to use recv(a,b,c,d)  function?


thanx

I am attempting to use the raw httpd with SSI support, but with lwip 1.3.2.  Using it on an ARM7TDMI with no OS.

 

I have a web page with 45 tags in it, and it renders very slowly, as in two-three tags per second.  Looking at wireshark, I don’t see any retransmits.  With lwip tcp debug messages, I do get a lot of “tcp_enqueue: queue too long 17 (16)” messages.  I tried increasing  TCP_SND_QUEUELEN as mentioned in some older lwip-users archives, but then I start running out of memory (“tcp_enqueue: could not allocate memory for zero-copy pbuf”).  So I question whether tweaking config parameters will solve my issues.

 

Are 45 tags simply too many for one page?  My ssi handler function is just a switch statement, and seems very quick even with printf’s at the start and the end:  both outputs appear virtually simultaneously, so I don’t think the lost time is there.  I could toggle a LED and put a scope on it, if someone wants actual timing info.

 

I’m reluctant to upgrade the entire lwip stack.  Additionally, I don’t know that this is even the reason for the slow rendering of the SSI page; other non-SSI pages render very quickly (no noticeable wait time).  Any suggestions if I’m heading down the correct path or not?  Any particular outputs that would help diagnose this issue?  Is this just not going to work without upgrading lwip, too?

 

Thanks,
Chris

 

_______________________________________________ lwip-users mailing list lwip-users-qX2TKyscuCcdnm+yROfE0A@public.gmane.org http://lists.nongnu.org/mailman/listinfo/lwip-users