[ECOS] LwIP PPP interface not coming up

[Frank Pagliughi <fpagliughi at mindspring dot com>]

Hey All,

I'm trying to test out PPP with lwip. Currently I'm just trying to get 
one of the lwip test applications, like 'tcpecho', to negotiate with a 
host (a Linux machine over a direct serial connection). It performs the 
negotiation, exchanges IP addresses, but it appears that maybe the ppp 
interface never comes up on the target. I'm getting the same behavior 
with an ARM EB55 target and an i386 PC target. I see similar questions 
posted from a few years back, but no solution.

Thanks,
Frank


Here's part of the debug output:

   ...
   IPCP: sending Configure-Request, id 3
   pbuf_free(0x002351a0)
   pbuf_free: deallocating 0x002351a0
   pppInProc[0]: got 15 bytes
   pbuf_alloc(length=0)
   pbuf_alloc: allocated pbuf 0x002351a0
   pbuf_alloc(length=0) == 0x002351a0
   tcpip_thread: CALLBACK 0x002350b0
   pbuf_header: old 0x002351b0 new 0x002351b8 (-8)
   pppInput[0]: IPCP len=10
   fsm_input(IPCP):2,3,10
   fsm_rconfack(IPCP): Rcvd id 3 state=8
   np_up: 0 proto=21
   np_up: maxconnect=0 idle_time_limit=0
   ipcp: up
   netif_set_ipaddr: netif address being changed
   netif: IP address of interface  set to 192.168.0.233
   netif: netmask of interface  set to 255.255.255.0
   netif: GW address of interface  set to 192.168.0.5
   netif: added interface pp IP addr 192.168.0.233 netmask
   255.255.255.0 gw 192.168.0.5
   sifup: unit 0: linkStatusCB=20e81c errCode=0
   callback 0
   netif: setting default interface pp
   local  IP address 192.168.0.233
   remote IP address 192.168.0.5
   pbuf_free(0x002351a0)
   pbuf_free: deallocating 0x002351a0
   pppInProc[0]: got 88 bytes
   pbuf_alloc(length=0)
   pbuf_alloc: allocated pbuf 0x002351a0
   pbuf_alloc(length=0) == 0x002351a0
   tcpip_thread: CALLBACK 0x002350b0
   pbuf_header: old 0x002351b0 new 0x002351b8 (-8)
   pppInput[0]: ip in pbuf len=84
   ip_input: iphdr->dest 0xe900a8c0 netif->ip_addr 0xe900a8c0 (0xa8c0,
   0xa8c0, 0xe9000000)     <--- The correct interface?
   ip_input: iphdr->dest 0xe900a8c0 netif->ip_addr 0x100007f (0xc0,
   0x7f, 0xe900a800)
   ip_input: packet not for us.
   ip_forward: not bouncing packets back on incoming interface.
   pbuf_free(0x002351a0)
   pbuf_free: deallocating 0x002351a0
   pppMainWakeup: unit 0 sio_read len=1504 returned 0
   pppMainWakeup: unit 0 sio_read len=1504 returned 0
   ...


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