Re: [lwip-users] DHCP problem with lwip 1.4.1

[bernard]

Hi Dimax, 

It seem the DHCP server respond with "DHCP_NAK". You can use wireshark to analyze packet.

Regards, 

Bernard Xiong 

2015-05-19 14:04 GMT+08:00 Dimax <address@hidden>:

Hi,
I faced a problem with DHCP client in lwip 1.4.1 with one specific
router (not sure what exactly it's type is as it is installed at
customer's house).
Same router works fine with Windows PC, i.e. PC get's IP from router
and connects to the internet.

Below is the DHCP module trace. I wonder if this is one of:
- known issue in 1.4.1 fixed in latest
- issue with router not related to lwip
- unknown issue (bug)

Trace:
dhcp_start(netif=200100A4) et0
dhcp_start(): starting new DHCP client
dhcp_start(): starting DHCP configuration
dhcp_discover()
transaction id xid(4d9ba518)
dhcp_discover: making request
dhcp_discover: realloc()ing
dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)
dhcp_discover: deleting()ing
dhcp_discover: SELECTING
dhcp_discover(): set request timeout 2000 msecs
dhcp_discover()
transaction id xid(958bf589)
dhcp_discover: making request
dhcp_discover: realloc()ing
dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)
dhcp_discover: deleting()ing
dhcp_discover: SELECTING
dhcp_discover(): set request timeout 2000 msecs
dhcp_recv(pbuf = 2000B51C) from DHCP server 192.168.1.1 port 67
pbuf->len = 300
pbuf->tot_len = 300
transaction id mismatch reply_msg->xid(4d9ba518)!=dhcp->xid(958bf589)
dhcp_recv(pbuf = 2000B51C) from DHCP server 192.168.1.1 port 67
pbuf->len = 300
pbuf->tot_len = 300
skipping option 2 in options
skipping option 23 in options
searching DHCP_OPTION_MESSAGE_TYPE
DHCP_OFFER received in DHCP_SELECTING state
dhcp_handle_offer(netif=200100A4) et0
dhcp_handle_offer(): server 0x0101a8c0
dhcp_handle_offer(): offer for 0x1a01a8c0
dhcp_select(netif=200100A4) et0
transaction id xid(4ed75815)
dhcp_select: REQUESTING
dhcp_select(): set request timeout 2000 msecs
dhcp_recv(pbuf = 2000B51C) from DHCP server 192.168.1.1 port 67
pbuf->len = 300
pbuf->tot_len = 300
searching DHCP_OPTION_MESSAGE_TYPE
DHCP_NAK received
dhcp_handle_nak(netif=200100A4) et0
dhcp_discover()
transaction id xid(454b179b)
...
and so on...

Thanks.

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