Fwd: Re: [lwip-users] ping

[address@hidden]

address@hidden  wrote:



looking the code and enabling the ip debug, I see that a icmp packet
seems to be correctly handled:

ip_input: iphdr->dest 0x4e17a8c0 netif->ip_addr 0x4e17a8c0 (0x17a8c0,
0x17a8c0, 0x4e000000)
ip_input: packet accepted on interface A1
ip_input:
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        60     | (v, hl, tos, len)
+-------------------------------+
|    15942      |000|       0   | (id, flags, offset)
+-------------------------------+
|  128  |    1  |    0x4C78     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |   23  |  100  | (src)
+-------------------------------+
|  192  |  168  |   23  |   78  | (dest)
+-------------------------------+
ip_input: p->len 60 p->tot_len 60
icmp_input: ping
ip_output_if: A10
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        60     | (v, hl, tos, len)
+-------------------------------+
|    15942      |000|       0   | (id, flags, offset)
+-------------------------------+
|  255  |    1  |    0xCD77     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |   23  |   78  | (src)
+-------------------------------+
|  192  |  168  |   23  |  100  | (dest)
+-------------------------------+
netif->output()icmp_input: ip_output_if returned an error: þ.
ip_input: iphdr->dest 0x4e17a8c0 netif->ip_addr 0x4e17a8c0 (0x17a8c0,
0x17a8c0, 0x4e000000)
ip_input: packet accepted on interface A1
ip_input:
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        60     | (v, hl, tos, len)
+-------------------------------+
|    15981      |000|       0   | (id, flags, offset)
+-------------------------------+
|  128  |    1  |    0x4C51     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |   23  |  100  | (src)
+-------------------------------+
|  192  |  168  |   23  |   78  | (dest)
+-------------------------------+
ip_input: p->len 60 p->tot_len 60
icmp_input: ping
ip_output_if: A10
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        60     | (v, hl, tos, len)
+-------------------------------+
|    15981      |000|       0   | (id, flags, offset)
+-------------------------------+
|  255  |    1  |    0xCD50     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |   23  |   78  | (src)
+-------------------------------+
|  192  |  168  |   23  |  100  | (dest)
+-------------------------------+
netif->output()icmp_input: ip_output_if returned an error: þ.

this error is -2

and looking into the ethernetif_input I use
/* skip Ethernet header */
pbuf_header( p, (s16_t)-sizeof(struct eth_hdr) );

/* pass to network layer */
xNetIf->input( p, xNetIf );

If I comment the line in which I skip the ethernet header, I receive
just wong ip packet.
Now, if the ip packet passed to ->input funzion seems to be ok, why the
netif->output()icmp_input: ip_output_if returned an error: þ.
produce an error?

the emac driver seems to works fine.

someone can help me?










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Stefano Marini
ExaLogic srl
Via Francesco D'Ovidio, 33/A
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P.IVA 09464491001
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