# PPP reconnection afrter a closing **URL:** \ **Category:** Rabbit\ **Created:** [November 11, 2007, 9:55am UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762 "2007-11-11T09:55:21Z")\ **Posts on this page:** 15\ **Page:** 1
**Author:** ![ventunocm](https://avatars.discourse-cdn.com/v4/letter/v/34f0e0/32.png) [@ventunocm](https://forums.digi.com/u/ventunocm)\ **Post date:** [November 11, 2007, 9:55am UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/1 "2007-11-11T09:55:21Z")
Hi all, i’m using a LP3500 with a GPRS Modem For the setting of the modem and it’s cheking i use a buffering system home-maded. If i use a cabled modem all works fine. But when with GPRS Modem i close the PPP on GPRS link all works but after i restart no connection is maded. and i not have any error feed-back. Anybody has an idea? How to reset communication buffers on PPPlibrary? Now i’m working with a routine that poer-dow the GPRS Terminal to ensure to not have any problem with that side, after reboot i wait the modem registration succeded but communication problems with modem persist. Tnx Marco ---
**Author:** ![ventunocm](https://avatars.discourse-cdn.com/v4/letter/v/34f0e0/32.png) [@ventunocm](https://forums.digi.com/u/ventunocm)\ **Post date:** [November 12, 2007, 7:28am UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/2 "2007-11-12T07:28:28Z")
PPP: sending LCP config req i/f 0 PPP: got packet 3723 on i/f:0 protocol:0xc021 PPP: LCP NAK on i/f 0 PPP: sending LCP config req i/f 0 PPP: got packet 3723 on i/f:0 protocol:0xc021 PPP: received LCP ACK i/f 0. local\_acked = 1 PPP: got packet 3723 on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: NAKing option 3 PPP: sending LCP nak i/f 0 PPP: got packet 3723 on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: accepting option 3 PPP: sending LCP ack i/f 0 PPP: sending our credentials a/b PPP: sending PAP auth i/f 0 PPP: got packet 3723 on i/f:0 protocol:0xc023 PPP: sending IPCP config i/f 0 PPP: got packet 3723 on i/f:0 protocol:0x8021 PPP: IPCP config request i/f 0 IPCP: peer wants IP addr C0A8FEFE PPP: accepting option 3 PPP: sending IPCP ack i/f 0 PPP: got packet 3723 on i/f:0 protocol:0x8021 PPP: IPCP NAK on i/f 0 PPP: sending IPCP config i/f 0 PPP: got packet 3723 on i/f:0 protocol:0x8021 PPP: i/f 0 UP AttivaPPP: Indirizzo IP: 217.201.201.126 in 11 s THE DICONNECTION: PPP: LCP terminating on i/f 0 PPP: sending LCP term i/f 0 PPP: got packet 3723 on i/f:0 protocol:0xc021 PPP: Got LCP term ACK, disconnecting PPP: LCP terminated on i/f 0 (result=1) ---
**Author:** ![ventunocm](https://avatars.discourse-cdn.com/v4/letter/v/34f0e0/32.png) [@ventunocm](https://forums.digi.com/u/ventunocm)\ **Post date:** [November 12, 2007, 7:31am UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/3 "2007-11-12T07:31:59Z")
PPP: sending LCP config req i/f 0 PPP: got packet 36EC on i/f:0 protocol:0xc021 PPP: received LCP ACK i/f 0. local\_acked = 1 PPP: got packet 36EC on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: NAKing option 3 PPP: sending LCP nak i/f 0 PPP: got packet 36EC on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: accepting option 3 PPP: sending LCP ack i/f 0 PPP: sending our credentials a/b PPP: sending PAP auth i/f 0 PPP: got packet 36EC on i/f:0 protocol:0xc023 PPP: sending IPCP config i/f 0 PPP: got packet 36EC on i/f:0 protocol:0xc021 PPP: sending LCP term ack i/f 0 PPP: link i/f 0 is down PPP: sending LCP config req i/f 0 PPP: got packet 3723 on i/f:0 protocol:0xc021 PPP: received LCP ACK i/f 0. local\_acked = 1 PPP: got packet 3723 on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: NAKing option 3 PPP: sending LCP nak i/f 0 PPP: got packet 3723 on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: accepting option 3 PPP: sending LCP ack i/f 0 PPP: sending our credentials a/b PPP: sending PAP auth i/f 0 PPP: got packet 3723 on i/f:0 protocol:0xc023 PPP: sending IPCP config i/f 0 PPP: got packet 3723 on i/f:0 protocol:0xc021 PPP: sending LCP term ack i/f 0 PPP: link i/f 0 is down ---
**Author:** ![ventunocm](https://avatars.discourse-cdn.com/v4/letter/v/34f0e0/32.png) [@ventunocm](https://forums.digi.com/u/ventunocm)\ **Post date:** [November 13, 2007, 10:28pm UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/4 "2007-11-13T22:28:14Z")
WHEN THE SCRIPT AND PPP WORKS: CHAT: sending ‘ATZ’ CHAT: expecting ‘ok’ CHAT: found it! CHAT: sending ‘AT+CGDCONT=1,“IP”,“ibox.tim.it”,0,0’ CHAT: expecting ‘ok’ CHAT: found it! CHAT: sending ‘ATD_99_\*\*1#’ CHAT: expecting ‘CONNECT’ CHAT: found it! CHAT: not sending anything CHAT: expecting ‘~’ CHAT: found it! CHAT: end of script AttivaPPP: Indirizzo IP: 217.202.9.18 in 11 s WHEN DOES’NT: CHAT: sending ‘ATZ’ CHAT: expecting ‘ok’ CHAT: found it! CHAT: sending ‘AT+CGDCONT=1,“IP”,“ibox.tim.it”,0,0’ CHAT: expecting ‘ok’ CHAT: found it! CHAT: sending ‘ATD_99__1#’ CHAT: expecting ‘CONNECT’ CHAT: found it! CHAT: not sending anything CHAT: expecting ‘~’ CHAT: found it! CHAT: end of script CHAT: sending ‘ATZ’ CHAT: expecting ‘ok’ CHAT: found it! CHAT: sending ‘AT+CGDCONT=1,“IP”,“ibox.tim.it”,0,0’ CHAT: expecting ‘ok’ CHAT: found it! CHAT: sending 'ATD99__1#’ CHAT: expecting ‘CONNECT’ CHAT: timed out CHAT: sending ‘ATH0’ CHAT: expecting ‘ok’ CHAT: found it! CHAT: end of script CHAT: sending ‘ATZ’ CHAT: expecting ‘ok’ CHAT: found it! CHAT: sending ‘AT+CGDCONT=1,“IP”,“ibox.tim.it”,0,0’ CHAT: expecting ‘ok’ CHAT: found it! CHAT: sending 'ATD99_\*\*1#’ CHAT: expecting ‘CONNECT’ CHAT: found it! CHAT: not sending anything CHAT: expecting ‘~’ CHAT: found it! CHAT: end of script AttivaPPP: errore di connessione wHE CAN FIND THE CHAT END BUT DOES’NT STARTS THE LCP AND IP HANDSHAKE. I use these commands: for(count = 0; count \< 3; count++) { #ifdef CONNMSG printf( "AttivaPPP: tentativo n. %d ", count+1); #endif //configure PPP for dialing in to ISP and bring it up ifconfig(IF\_DEFAULT, IFS\_PPP\_INIT, IFS\_END); ifconfig(IF\_DEFAULT, IFS\_PPP\_SPEED, VELMODEM, IFS\_PPP\_USEMODEM, 1, IFS\_PPP\_RTSPIN, PBDR, NULL, 7, // Note: the NULL is for the shadow register. From DC9.0, // this is computed automatically - the value passed here // for the shadow register is ignored. IFS\_PPP\_CTSPIN, PBDR, 0, IFS\_PPP\_FLOWCONTROL, 0, IFS\_PPP\_SENDEXPECT, DIALUP\_SENDEXPECT, #ifdef GPRSEN IFS\_PPP\_HANGUP, “ATH0 #ok”, #else IFS\_PPP\_HANGUP, “ATH #ok”, #endif IFS\_PPP\_MODEMESCAPE, 1, IFS\_PPP\_ACCEPTIP, 1, IFS\_PPP\_ACCEPTDNS, 1, IFS\_PPP\_REMOTEAUTH, DIALUP\_NAME, DIALUP\_PASSWORD, IFS\_UP, IFS\_END); while(ifpending(IF\_DEFAULT) & 1) { tcp\_tick(NULL); } if (ifstatus(IF\_DEFAULT)) break; } ---
**Author:** ![ventunocm](https://avatars.discourse-cdn.com/v4/letter/v/34f0e0/32.png) [@ventunocm](https://forums.digi.com/u/ventunocm)\ **Post date:** [November 14, 2007, 9:16am UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/5 "2007-11-14T09:16:44Z")
First and working connection ( i can reconnect without turning off/on) the gprs modem only resetting the board with the command in dc5.92) PPPLINK: baud rate 19200: setting divisor to 11 PPPLINK: bringing up serial PPP interface 0 PPPLINK: baud rate 19200: setting divisor to 11 PPPLINK: Opened PPP serial on iface 0 at 19200 baud PPPLINK: starting modem escape sequence PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=5 i/f 0 PPPLINK: sendpacket totlen=38 i/f 0 PPPLINK: sendpacket totlen=13 i/f 0 PPPLINK: sendpacket totlen=24 i/f 0 PPPLINK: sendpacket totlen=24 i/f 0 PPPLINK: sendpacket totlen=13 i/f 0 PPPLINK: sendpacket totlen=28 i/f 0 PPPLINK: sendpacket totlen=12 i/f 0 PPPLINK: sendpacket totlen=26 i/f 0 PPPLINK: sendpacket totlen=14 i/f 0 PPPLINK: sendpacket totlen=26 i/f 0 AttivaPPP: Indirizzo IP: 217.201.67.76 in 10 s SECOND AND ABOVE NOT WORKING CONNECTIONS: PPPLINK: baud rate 19200: setting divisor to 11 PPPLINK: bringing up serial PPP interface 0 PPPLINK: baud rate 19200: setting divisor to 11 PPPLINK: Opened PPP serial on iface 0 at 19200 baud PPPLINK: starting modem escape sequence PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=5 i/f 0 PPPLINK: sendpacket totlen=38 i/f 0 PPPLINK: sendpacket totlen=13 i/f 0 PPPLINK: sendpacket totlen=24 i/f 0 PPPLINK: sendpacket totlen=13 i/f 0 PPPLINK: sendpacket totlen=28 i/f 0 PPPLINK: sendpacket totlen=12 i/f 0 PPPLINK: sendpacket totlen=26 i/f 0 PPPLINK: sendpacket totlen=8 i/f 0 PPPLINK: baud rate 19200: setting divisor to 11 PPPLINK: bringing up serial PPP interface 0 PPPLINK: baud rate 19200: setting divisor to 11 PPPLINK: Opened PPP serial on iface 0 at 19200 baud PPPLINK: starting modem escape sequence PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=5 i/f 0 PPPLINK: sendpacket totlen=38 i/f 0 PPPLINK: sendpacket totlen=13 i/f 0 PPPLINK: starting modem escape sequence PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=6 i/f 0 PPPLINK: Closed PPP serial on iface 0 PPPLINK: baud rate 19200: setting divisor to 11 PPPLINK: bringing up serial PPP interface 0 PPPLINK: baud rate 19200: setting divisor to 11 PPPLINK: Opened PPP serial on iface 0 at 19200 baud PPPLINK: starting modem escape sequence PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=5 i/f 0 PPPLINK: sendpacket totlen=38 i/f 0 PPPLINK: sendpacket totlen=13 i/f 0 PPPLINK: sendpacket totlen=24 i/f 0 PPPLINK: sendpacket totlen=13 i/f 0 PPPLINK: sendpacket totlen=28 i/f 0 PPPLINK: sendpacket totlen=12 i/f 0 PPPLINK: sendpacket totlen=26 i/f 0 PPPLINK: sendpacket totlen=8 i/f 0 AttivaPPP: errore di connessione How i close the woring connection: PPPLINK: sendpacket totlen=41 i/f 0 PPPLINK: sendpacket totlen=41 i/f 0 PPPLINK: sendpacket totlen=41 i/f 0 PPPLINK: sendpacket totlen=41 i/f 0 PPPLINK: sendpacket totlen=41 i/f 0 PPPLINK: sendpacket totlen=41 i/f 0 PPPLINK: sendpacket totlen=41 i/f 0 PPPLINK: bringing down serial PPP interface 0 PPPLINK: sendpacket totlen=8 i/f 0 PPPLINK: starting modem escape sequence PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=6 i/f 0 PPPLINK: Closed PPP serial on iface 0 ---
**Author:** ![User1080](https://avatars.discourse-cdn.com/v4/letter/u/bc8723/32.png) [@User1080](https://forums.digi.com/u/User1080)\ **Post date:** [November 14, 2007, 10:48am UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/6 "2007-11-14T10:48:54Z")
i’ve similar problem here. I’m using the RCM3360 to connect to Simens GPRS Modem. I used ifconfig(…IFS\_UP…) and ifconfig(…IFS\_DOWN…) to bring up and close the interface. First run everything works fine, but if i put the program into a loop, all the subsequence PPP connection will fail… Guess i need to reset/init the PPP struct… anybody have any idea how to do this? ---
**Author:** ![ventunocm](https://avatars.discourse-cdn.com/v4/letter/v/34f0e0/32.png) [@ventunocm](https://forums.digi.com/u/ventunocm)\ **Post date:** [November 14, 2007, 10:15pm UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/7 "2007-11-14T22:15:02Z")
Hi, i think is necessary to reset PPP buffers or TCP/ip STACKS. I posted a question to technical support to have more help. What kind of provider you are using? I’m using Italian Telecom Italia Mobile Tomorow i’ll try whit another Cellular line provider Bye ---
**Author:** ![User1080](https://avatars.discourse-cdn.com/v4/letter/u/bc8723/32.png) [@User1080](https://forums.digi.com/u/User1080)\ **Post date:** [November 15, 2007, 3:36am UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/8 "2007-11-15T03:36:41Z")
i’m using Siemens MC35i Modem to connect to Malaysian ‘Celcom’ ISP. I dont really think there was a problem with the cellular line provider, instead it is the PPP/TCPIP stack we were using… When i first run the program, the PPP connection established. If i run again it still running fine. The problem happen when i tried to put the whole program in a loop. In this case, only the first run will the PPP be connected, the subsequence run will fail completely. So i believe when the program start/restart, something init the PPP/TCPIP stack… Did you find anyting to re-init the stacks? I will be looking into this matter later. If not i will try to dig into the library to see what’s actually happen… ---
**Author:** ![User1080](https://avatars.discourse-cdn.com/v4/letter/u/bc8723/32.png) [@User1080](https://forums.digi.com/u/User1080)\ **Post date:** [November 15, 2007, 7:43am UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/9 "2007-11-15T07:43:15Z")
Below is the PPP conn verbose: CHAT: sending ‘ATZ’ CHAT: expecting ‘OK’ CHAT: found it! CHAT: sending ‘ATH’ CHAT: expecting ‘OK’ CHAT: found it! CHAT: sending ‘AT+CGDCONT=1,IP,celcom.net.my’ CHAT: expecting ‘OK’ CHAT: found it! CHAT: sending ‘ATD_99_\*\*1#’ CHAT: expecting ‘CONNECT’ CHAT: found it! CHAT: not sending anything CHAT: expecting ‘~’ CHAT: found it! CHAT: end of script PPP: sending LCP config req i/f 0 PPP: got packet B3CA on i/f:0 protocol:0xc021 PPP: LCP NAK on i/f 0 PPP: sending LCP config req i/f 0 PPP: got packet B3CA on i/f:0 protocol:0xc021 PPP: received LCP ACK i/f 0. local\_acked = 1 PPP: got packet B3CA on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: peer requesting authentication, but no credentials PPP: rejecting option 3 PPP: sending LCP reject i/f 0 PPP: got packet B3CA on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: peer requesting authentication, but no credentials PPP: rejecting option 3 PPP: sending LCP reject i/f 0 PPP: got packet B3CA on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: sending LCP ack i/f 0 PPP: sending IPCP config i/f 0 PPP: got packet B3CA on i/f:0 protocol:0x8021 PPP: IPCP config request i/f 0 IPCP: peer wants IP addr C0A8FEFE PPP: accepting option 3 PPP: sending IPCP ack i/f 0 PPP: got packet B3CA on i/f:0 protocol:0x8021 PPP: IPCP NAK on i/f 0 PPP: sending IPCP config i/f 0 PPP: got packet B3CA on i/f:0 protocol:0x8021 PPP: i/f 0 UP INFO PPP connection established. IP address = 10.131.117.156 // …other SMTP program within here…// PPP: LCP terminating on i/f 0 PPP: sending LCP term i/f 0 PPP: sending LCP term i/f 0 PPP: sending LCP term i/f 0 PPP: sending LCP term i/f 0 PPP: sending LCP term i/f 0 PPP: sending LCP term i/f 0 PPP: sending LCP term i/f 0 PPP: LCP too many retries during shutdown i/f 0 // -----\> problem not terminating properly PPP: LCP terminated on i/f 0 (result=-20) CHAT: sending ‘ATH’ CHAT: expecting ‘OK’ CHAT: found it! CHAT: end of script // ------------second & subsequence loops-----------// CHAT: sending ‘ATZ’ CHAT: expecting ‘OK’ CHAT: found it! CHAT: sending ‘ATH’ CHAT: expecting ‘OK’ CHAT: found it! CHAT: sending ‘AT+CGDCONT=1,IP,celcom.net.my’ CHAT: expecting ‘OK’ CHAT: found it! CHAT: sending ‘ATD_99_\*\*1#’ CHAT: expecting ‘CONNECT’ CHAT: found it! CHAT: not sending anything CHAT: expecting ‘~’ CHAT: found it! CHAT: end of script PPP: sending LCP config req i/f 0 PPP: got packet B401 on i/f:0 protocol:0xc021 PPP: received LCP ACK i/f 0. local\_acked = 1 PPP: got packet B401 on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: peer requesting authentication, but no credentials PPP: rejecting option 3 PPP: sending LCP reject i/f 0 PPP: got packet B401 on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: peer requesting authentication, but no credentials PPP: rejecting option 3 PPP: sending LCP reject i/f 0 PPP: got packet B401 on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: sending LCP ack i/f 0 PPP: sending IPCP config i/f 0 PPP: got packet B401 on i/f:0 protocol:0xc021 PPP: sending LCP term ack i/f 0 PPP: link i/f 0 is down ERR PPP connection failed GPRS Connection Failed ---
**Author:** ![ventunocm](https://avatars.discourse-cdn.com/v4/letter/v/34f0e0/32.png) [@ventunocm](https://forums.digi.com/u/ventunocm)\ **Post date:** [November 19, 2007, 12:57am UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/10 "2007-11-19T00:57:37Z")
These is the working modem ( same procedures different hardware and ISP ) PPPLINK: bringing up serial PPP interface 0 PPPLINK: baud rate 19200: setting divisor to 11 PPPLINK: Opened PPP serial on iface 0 at 19200 baud PPPLINK: starting modem escape sequence PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=5 i/f 0 PPPLINK: sendpacket totlen=9 i/f 0 PPP: sending LCP config req i/f 0 PPPLINK: sendpacket totlen=24 i/f 0 PPP: got packet 36D6 on i/f:0 protocol:0xc021 PPP: received LCP ACK i/f 0. local\_acked = 1 PPP: sending LCP config req i/f 0 PPPLINK: sendpacket totlen=24 i/f 0 PPP: got packet 36D6 on i/f:0 protocol:0xc021 PPP: received LCP ACK i/f 0. local\_acked = 1 PPP: got packet 36D6 on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 5 PPP: accepting option 7 PPP: accepting option 8 PPP: sending LCP ack i/f 0 PPPLINK: sendpacket totlen=24 i/f 0 PPP: sending IPCP config i/f 0 PPPLINK: sendpacket totlen=26 i/f 0 PPP: got packet 36D6 on i/f:0 protocol:0xc021 PPP: got packet 370D on i/f:0 protocol:0x8021 PPP: IPCP config request i/f 0 PPP: rejecting option 2 IPCP: peer wants IP addr 0A990101 PPP: sending IPCP reject i/f 0 PPPLINK: sendpacket totlen=14 i/f 0 PPP: got packet 370D on i/f:0 protocol:0x8021 PPP: IPCP NAK on i/f 0 PPP: sending IPCP config i/f 0 PPPLINK: sendpacket totlen=26 i/f 0 PPP: got packet 370D on i/f:0 protocol:0x8021 PPP: IPCP config request i/f 0 IPCP: peer wants IP addr 0A990101 PPP: accepting option 3 PPP: sending IPCP ack i/f 0 PPPLINK: sendpacket totlen=14 i/f 0 PPP: got packet 370D on i/f:0 protocol:0x8021 PPP: i/f 0 UP AttivaPPP: Indirizzo IP: 10.171.49.125 in 16 s richiedo invio stato sbas 18/11/2007 23:06:24 PPPLINK: sendpacket totlen=45 i/f 0 PPP: got packet 370D on i/f:0 protocol:0x21 PPPLINK: sendpacket totlen=41 i/f 0 PPPLINK: sendpacket totlen=70 i/f 0 BatteriaALM: 12.585107V PPPLINK: sendpacket totlen=409 i/f 0 PPPLINK: sendpacket totlen=81 i/f 0 PPP: got packet 370D on i/f:0 protocol:0x21 richiedo invio stato sbas 18/11/2007 23:06:37 PPPLINK: sendpacket totlen=449 i/f 0 richiedo invio stato sbas 18/11/2007 23:06:49 PPPLINK: sendpacket totlen=41 i/f 0 PPP: got packet 370D on i/f:0 protocol:0xc021 PPP: got packet 370D on i/f:0 protocol:0x21 PPPLINK: sendpacket totlen=41 i/f 0 PPPLINK: bringing down serial PPP interface 0 PPP: LCP terminating on i/f 0 PPP: sending LCP term i/f 0 PPPLINK: sendpacket totlen=8 i/f 0 PPP: got packet 370D on i/f:0 protocol:0x21 PPPLINK: sendpacket totlen=41 i/f 0 PPP: sending LCP term i/f 0 PPPLINK: sendpacket totlen=8 i/f 0 PPP: got packet 370D on i/f:0 protocol:0xc021 PPP: Got LCP term ACK, disconnecting PPP: LCP terminated on i/f 0 (result=1) PPPLINK: starting modem escape sequence PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=1 i/f 0 PPPLINK: sendpacket totlen=5 i/f 0 PPPLINK: Closed PPP serial on iface 0 ---
**Author:** ![jordan1](https://avatars.discourse-cdn.com/v4/letter/j/e95f7d/32.png) [@jordan1](https://forums.digi.com/u/jordan1)\ **Post date:** [December 5, 2007, 11:44am UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/11 "2007-12-05T11:44:15Z")
i’m using Siemens MC35i Modem to connect to Malaysian ‘Celcom’ ISP. I dont really think there was a problem with the cellular line provider, instead it is the PPP/TCPIP stack we were using. ---
**Author:** ![User1080](https://avatars.discourse-cdn.com/v4/letter/u/bc8723/32.png) [@User1080](https://forums.digi.com/u/User1080)\ **Post date:** [November 23, 2007, 4:55am UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/12 "2007-11-23T04:55:06Z")
i still can’t find a way to solve my problem… i dont have any other modem to test with. So i still have to find a way to get around the PPP re-connection problem… below are the program trace for my PPP re-connection which failed: CHAT: sending ‘ATZ’ CHAT: expecting ‘OK’ CHAT: found it! CHAT: sending ‘ATH’ CHAT: expecting ‘OK’ CHAT: found it! CHAT: sending ‘AT+CGDCONT=1,IP,celcom.net.my’ CHAT: expecting ‘OK’ CHAT: found it! CHAT: sending ‘ATD_99_\*\*1#’ CHAT: expecting ‘CONNECT’ CHAT: found it! CHAT: not sending anything CHAT: expecting ‘~’ CHAT: found it! CHAT: end of script PPP: sending LCP config req i/f 0 PPP: got packet B393 on i/f:0 protocol:0xc021 PPP: LCP NAK on i/f 0 PPP: sending LCP config req i/f 0 PPP: got packet B393 on i/f:0 protocol:0xc021 PPP: received LCP ACK i/f 0. local\_acked = 1 PPP: got packet B393 on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: peer requesting authentication, but no credentials PPP: rejecting option 3 PPP: sending LCP reject i/f 0 PPP: got packet B393 on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: peer requesting authentication, but no credentials PPP: rejecting option 3 PPP: sending LCP reject i/f 0 PPP: got packet B393 on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: sending LCP ack i/f 0 PPP: sending IPCP config i/f 0 //-----------------here it successfully received the ICPC protocol (0x8021) packet-------------// PPP: got packet B393 on i/f:0 protocol:0x8021 PPP: IPCP config request i/f 0 IPCP: peer wants IP addr C0A8FEFE PPP: accepting option 3 PPP: sending IPCP ack i/f 0 PPP: got packet B393 on i/f:0 protocol:0x8021 PPP: IPCP NAK on i/f 0 PPP: sending IPCP config i/f 0 PPP: got packet B393 on i/f:0 protocol:0x8021 PPP: i/f 0 UP INFO PPP connection established. IP address = 10.131.209.168 PPP: LCP terminating on i/f 0 PPP: sending LCP term i/f 0 PPP: got packet B393 on i/f:0 protocol:0xc021 PPP: Got LCP term ACK, disconnecting PPP: LCP terminated on i/f 0 (result=1) CHAT: sending ‘ATH’ CHAT: expecting ‘OK’ CHAT: found it! CHAT: end of script GPRS Interface disconnected //----------------- 2nd & subsequence reconnection in a loop ---------// CHAT: sending ‘ATZ’ CHAT: expecting ‘OK’ CHAT: found it! CHAT: sending ‘ATH’ CHAT: expecting ‘OK’ CHAT: found it! CHAT: sending ‘AT+CGDCONT=1,IP,celcom.net.my’ CHAT: expecting ‘OK’ CHAT: found it! CHAT: sending ‘ATD_99_\*\*1#’ CHAT: expecting ‘CONNECT’ CHAT: found it! CHAT: not sending anything CHAT: expecting ‘~’ CHAT: found it! CHAT: end of script PPP: sending LCP config req i/f 0 PPP: got packet B401 on i/f:0 protocol:0xc021 PPP: received LCP ACK i/f 0. local\_acked = 1 PPP: got packet B401 on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: peer requesting authentication, but no credentials PPP: rejecting option 3 PPP: sending LCP reject i/f 0 PPP: got packet B401 on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: peer requesting authentication, but no credentials PPP: rejecting option 3 PPP: sending LCP reject i/f 0 PPP: got packet B401 on i/f:0 protocol:0xc021 PPP: LCP config request i/f 0 PPP: accepting option 2 PPP: accepting option 7 PPP: accepting option 8 PPP: accepting option 5 PPP: sending LCP ack i/f 0 PPP: sending IPCP config i/f 0 //---------------- but here it received the LCP protocol (0x8021) packet----------------------// //---------------- instead of ICPC protocol packet -------------// PPP: got packet B401 on i/f:0 protocol:0xc021 PPP: sending LCP term ack i/f 0 PPP: link i/f 0 is down GPRS Connection Failed ---
**Author:** ![User1080](https://avatars.discourse-cdn.com/v4/letter/u/bc8723/32.png) [@User1080](https://forums.digi.com/u/User1080)\ **Post date:** [November 23, 2007, 5:07am UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/13 "2007-11-23T05:07:02Z")
anybody have any experience on this situation? should i re-init the PPP stack or PPP interface before re-connecting it? I’d tried the ifconfig(… IFS\_PPP\_INIT…); but it didn’t solve my problem… another problem i’m having is ifpending() will not give an updated status of the interface if i manually unplugged the physical cable from the modem. It would only reads the status from the stack which might be the previous status, unless i use the ifconfig(…IFS\_DOWN…) to properly bring down the interface. But i want to take into consideration in case of modem failure, power loss, etc… So is there any other way of checking the status of the PPP link manually? ---
**Author:** ![User1080](https://avatars.discourse-cdn.com/v4/letter/u/bc8723/32.png) [@User1080](https://forums.digi.com/u/User1080)\ **Post date:** [December 10, 2007, 7:15am UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/14 "2007-12-10T07:15:19Z")
[QUOTE=jordan;1121]i’m using Siemens MC35i Modem to connect to Malaysian ‘Celcom’ ISP. I dont really think there was a problem with the cellular line provider, instead it is the PPP/TCPIP stack we were using.[/quote] friend, what are you talking about? Why were you quoting back the sentences i wrote earlier on? what is your point? ---
**Author:** ![luis.serrano.aranda](https://avatars.discourse-cdn.com/v4/letter/l/13edae/32.png) [@luis.serrano.aranda](https://forums.digi.com/u/luis.serrano.aranda)\ **Post date:** [October 27, 2008, 1:42pm UTC](https://forums.digi.com/t/ppp-reconnection-afrter-a-closing/10762/15 "2008-10-27T13:42:23Z")
You’ve already solved the problem ? I Have the same problem. Thanks