Hi Ivan,
When you get your callback indicating that the connection is up, that is when you need to send the router solicitation.
See the example code below in the following link :
https://github.com/particle-iot/lwip-contrib/blob/master/examples/ppp/pppos_example.c
Look at line 96 – 98
#if PPP_IPV6_SUPPORT
fprintf(stderr, " our6_ipaddr = %s\n\r", ip6addr_ntoa(netif_ip6_addr(pppif, 0)));
This is where you send Router Solicitation
#endif /* PPP_IPV6_SUPPORT */
From: lwip-users <lwip-users-bounces+edmangzayzay=eaton.com@nongnu.org>
On Behalf Of Jiang Peng
Sent: Thursday, November 11, 2021 6:41 PM
To: Mailing list for lwIP users <lwip-users@nongnu.org>
Subject: Re: [lwip-users] [EXTERNAL] lwip IPV6 PPP only get link local address and cannot connect to server
Thanks a lot for the information. It appears that is the same issue I faced.
I tried your suggestion, to add nd6_send_rs, but nothing happened, or I just add it in wrong place(I call it in ppposif.c).
Could you please shed some light on how to send this rs?
Upgrading to 2.1.3 may not be an option for me for now.
Hi Ivan,
You need to explicitly send a router solicitation to the network in other to get the full IPv6 Address. The function to call is nd6_send_rs() in n6.c . However, this is a static
function and you may have to create a wrapper to call it. As of yesterday, LWIP 2.1.3 was released and they now send RS automatically for IPv6. Hope this helps as I had the same issue 9 months ago.
Edman
From: lwip-users <lwip-users-bounces+edmangzayzay=eaton.com@nongnu.org>
On Behalf Of Jiang Peng
Sent: Wednesday, November 10, 2021 6:40 PM
To: lwip-users@nongnu.org
Subject: [EXTERNAL] [lwip-users] lwip IPV6 PPP only get link local address and cannot connect to server
I have a project that is running LwIP V2.1.2. The stack is LwIP on top of BG96 cellular modem.
It works fine for IPV4, but when I enable IPV6, I only get IPV6 link local address, and cannot get real IPV6 address, therefore, I cannot connect to my server.
The LwIP comes from ST cellular expansion package.
I enable the log, and it got local and remote LL address, but after that never got any real address, and cannot connect to my server.
thanks a lot for any hints or suggestions.
////////////////////////////////////////////////////////////////////////////logs //////////////////////////////////////////////////////////////////////
05.535 atcmd BG96:Activate PDN (user cid = 1, modem cid = 1)
05.542 atcmd BG96:MODEM SWITCHES TO DATA MODE
05.542 atcmd ATCore:<<< DATA MODE SELECTED >>>
ppposif_client_confignetif: netmask of interface set to 255.255.255.255
netif: added interface pp IP addr 0.0.0.0 netmask 255.255.255.255 gw 0.0.0.0
ppp phase changed[0]: phase=0
netif: setting default interface pp
netif: setting default interface pp
client ppp_notify_phase_cb: PPP_PHASE_DEADppposif_client_dead: DC_SERVICE_OFF
06.035 iot_cell =====>CST_notif_callback (Data Cache event=0)
ppp_connect[0]: holdoff=0
ppp phase changed[0]: phase=3
client ppp_notify_phase_cb: PPP_PHASE_INITIALIZEpppos_connect: unit 0: connecting
ppp_start[0]
ppp phase changed[0]: phase=6
pppos_send_config[0]: out_accm=FF FF FF FF
ppp_send_config[0]
pppos_recv_config[0]: in_accm=FF FF FF FF
ppp_recv_config[0]
ppp: auth protocols: PAP=0
pppos_write[0]: len=24
ppp_start[0]: finished
pppos_input[0]: got 61 bytes
pbuf_remove_header: old 0x24016058 new 0x2401605a (2)
No auth is possible
lcp_reqci: returning CONFREJ.pppos_write[0]: len=13
tcpip_inpkt: PACKET 0x24016258/0x2400eae8
pppos_input[0]: got 7 bytes
pbuf_remove_header: old 0x24016058 new 0x2401605a (2)
tcpip_inpkt: PACKET 0x24016258/0x2400eae8
pppos_input[0]: got 1 bytes
tcpip_inpkt: PACKET 0x24016258/0x2400eae8
pppos_input[0]: got 44 bytes
pbuf_remove_header: old 0x24016058 new 0x2401605a (2)
lcp_reqci: returning CONFACK.pppos_write[0]: len=24
netif_set_mtu[0]: mtu=1500
pppos_send_config[0]: out_accm=0 0 0 0
ppp_send_config[0]
pppos_recv_config[0]: in_accm=0 0 0 0
ppp_recv_config[0]
ppp phase changed[0]: phase=7
07.031 iot_cell =====>CST_notif_callback (Data Cache event=2)
07.128 iot_cell =====>CST_notif_callback (Data Cache event=0)
07.128 iot_cell =====>CST_notif_callback (Data Cache event=1)
07.128 iot_cell -----> New State: CST_PPP_CONFIG_ON_GOING_STATE <-----
07.128 iot_cell ============ CST_cellular_service_task : autom_event = no event
mtd_init.c +301 StartIoTTask Modem state is 18, ST Safe found
ppp phase changed[0]: phase=9
pppos_input[0]: got 21 bytes
ipv6cp: received interface identifier (fe80::1525:f2b1:ebca:3352) (ACK)
ipv6cp: returning Configure-ACKpppos_write[0]: len=18
tcpip_inpkt: PACKET 0x24016258/0x2400eae8
pppos_input[0]: got 20 bytes
pbuf_remove_header: old 0x24016058 new 0x2401605a (2)
local LL address fe80::d823:7001:beb5:b051pppos_write[0]: len=18
tcpip_inpkt: PACKET 0x24016258/0x2400eae8
pppos_input[0]: got 1 bytes
tcpip_inpkt: PACKET 0x24016258/0x2400eae8
pppos_input[0]: got 19 bytes
pbuf_remove_header: old 0x24016058 new 0x2401605a (2)
ipv6cp: upnetif_ip6_addr_set: netif address being changed
netif: IPv6 address 0 of interface pp set to FE80::D823:7001:BEB5:B051/0x0hx
netif_ip6_addr_set_state: netif address state being changed
netif: IPv6 address 0 of interface pp set to FE80::D823:7001:BEB5:B051/0x0hx
sif6up[0]: err_code=0
our_ipaddr = 0.0.0.0 his_ipaddr = 0.0.0.0 netmask = 255.255.255.255 dns1 = 8.8.8.8 dns2 = 8.8.4.4 our6_ipaddr = FE80::D823:7001:BEB5:B051
local LL address fe80::d823:7001:beb5:b051
remote LL address fe80::1525:f2b1:ebca:3352
ppp phase changed[0]: phase=10
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