Re: [lwip-users] lwip reply delayed after long communication idle time

[Jochen Strohbeck]

Looks to me that LWIP does not respond to some ARP protocol requests of the
host.

Can you give me a hint what happens if these debug messages appear?

2012-01-01 00:00:06 [W]gmac_low_level_input: DMA buffer 0x2045d878 received,
size=64 [idx=1]
2012-01-01 00:00:06 [W]gmac_rx_populate_queue: new pbuf allocated:
0x2045de88 [idx=1]
2012-01-01 00:00:06 [W]ethernet_input: dest:ff:ff:ff:ff:ff:ff,
src:98:e7:43:7a:2c:51, type:806
2012-01-01 00:00:06 [W]etharp_update_arp_entry: 0.0.0.0 - 98:e7:43:7a:2c:51
2012-01-01 00:00:06 [W]etharp_update_arp_entry: will not add non-unicast IP
address to ARP cache
2012-01-01 00:00:06 [W]etharp_arp_input: incoming ARP request
2012-01-01 00:00:06 [W]etharp_arp_input: ARP request was not for us.
2012-01-01 00:00:07 [W]etharp_timer
2012-01-01 00:00:07 [W]gmac_low_level_input: DMA buffer 0x2045d268 received,
size=64 [idx=2]
2012-01-01 00:00:07 [W]gmac_rx_populate_queue: new pbuf allocated:
0x2045d878 [idx=2]
2012-01-01 00:00:07 [W]ethernet_input: dest:ff:ff:ff:ff:ff:ff,
src:98:e7:43:7a:2c:51, type:806
2012-01-01 00:00:07 [W]etharp_update_arp_entry: 192.168.0.9 -
98:e7:43:7a:2c:51
2012-01-01 00:00:07 [W]etharp_find_entry: found empty entry 0
2012-01-01 00:00:07 [W]etharp_find_entry: no empty entry found and not
allowed to recycle
2012-01-01 00:00:07 [W]etharp_arp_input: incoming ARP request
2012-01-01 00:00:07 [W]etharp_arp_input: ARP request was not for us.

I guess this is related to

153     545.813083      Dell_7a:2c:51   Broadcast       ARP     42      Who has 
192.168.0.100? Tell
192.168.0.9

Frame 153: 42 bytes on wire (336 bits), 42 bytes captured (336 bits) on
interface \Device\NPF_{8242F687-1E46-4D87-BC7E-FE0333601B68}, id 0
Ethernet II, Src: Dell_7a:2c:51 (98:e7:43:7a:2c:51), Dst: Broadcast
(ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
    Source: Dell_7a:2c:51 (98:e7:43:7a:2c:51)
    Type: ARP (0x0806)
Address Resolution Protocol (request)
    Hardware type: Ethernet (1)
    Protocol type: IPv4 (0x0800)
    Hardware size: 6
    Protocol size: 4
    Opcode: request (1)
    Sender MAC address: Dell_7a:2c:51 (98:e7:43:7a:2c:51)
    Sender IP address: 192.168.0.9
    Target MAC address: 00:00:00_00:00:00 (00:00:00:00:00:00)
    Target IP address: 192.168.0.100

Is there a switch to enable lwip to respond to this request?
Or is this caused by a invalid/inappropriate network configuration?

Thanks



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