First of all, sorry for the question if it is obvious, I'm not very good at network configuration.
I'm currently trying to connect a Linux machine with Busybox through a modem to a cellular network (T-Mobile NL). After configuring ppp according to the network parameters, ppp connects successfully to the modem, but when starting IPCP negotiation, the modem hangs up, without any indication of the error. The only thing I can imagine is that it is linked to IPCP negotiation, since it is the step of the connection during which the modem hangs up.
Here is my configuration:
ppp options:
/dev/modem_at0
lock
debug
logfile /var/log/ppplog
115200
linkname ppp0
defaultroute
replacedefaultroute
auth
user "tmobile"
password "tmobile"
crtscts
holdoff 3
persist
connect '/usr/sbin/chat -v -t 90 -f /etc/ppp/peers/gsm_chat'
disconnect "chat -- \d+++\d\c OK ath0 OK"
noipdefault
novj
novjccomp
noaccomp
nobsdcomp
novj
noccp
ipcp-accept-local
ipcp-accept-remote
ipcp-restart 15
ipcp-max-failure 10
ipcp-restart 10
maxfail 40
ipv6cp-restart 15
Modem chat: (/etc/ppp/peers/gsm_chat)
SAY "GSM chat\n"
ECHO OFF
ABORT 'NO DIAL TONE'
ABORT 'NO DIALTONE'
ABORT 'NO ANSWER'
ABORT 'NO CARRIER'
ABORT 'DELAYED'
ABORT 'VOICE'
ABORT 'BUSY'
'' 'AT'
OK 'ATZ'
OK 'AT+CSQ'
OK 'AT+CPIN=****'
# Added the correct pin just above
REPORT CONNECT
OK 'AT+CGDCONT=1,"IP","smartsites.t-mobile"'
SAY "Dialing...\n"
OK 'ATD*99#'
SAY "Waiting for CONNECT...\n"
TIMEOUT 120
CONNECT ''
SAY "Connected\n"
Logs:
GSM chat
Dialing...
Waiting for CONNECT...
Connected
chat: May 08 06:28:47 CONNECT 100000000
Script /usr/sbin/chat -v -t 90 -f /etc/ppp/peers/gsm_chat finished (pid 604), status = 0x0
Serial connection established.
using channel 1
Using interface ppp0
Connect: ppp0 <--> /dev/modem_at0
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <auth eap> <magic 0x1dabaabe> <pcomp>]
rcvd [LCP ConfReq id=0x0 <asyncmap 0x0> <auth chap MD5> <magic 0x451d49cd> <pcomp> <accomp>]
sent [LCP ConfRej id=0x0 <accomp>]
rcvd [LCP ConfRej id=0x1 <auth eap>]
sent [LCP ConfReq id=0x2 <asyncmap 0x0> <auth chap MD5> <magic 0x1dabaabe> <pcomp>]
rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap MD5> <magic 0x451d49cd> <pcomp>]
sent [LCP ConfAck id=0x1 <asyncmap 0x0> <auth chap MD5> <magic 0x451d49cd> <pcomp>]
rcvd [LCP ConfRej id=0x2 <auth chap MD5>]
sent [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0x1dabaabe> <pcomp>]
rcvd [LCP ConfAck id=0x3 <asyncmap 0x0> <magic 0x1dabaabe> <pcomp>]
Warning - secret file /etc/ppp/pap-secrets has world and/or group access
rcvd [LCP DiscReq id=0x2 magic=0x451d49cd]
rcvd [CHAP Challenge id=0x1 <06caf8ebf2c8971a809509e3f27a368a>, name = "UMTS_CHAP_SRVR"]
sent [CHAP Response id=0x1 <ceb886dabe81e0d6484f903ae4ad2d5d>, name = "tmobile"]
rcvd [CHAP Success id=0x1 ""]
CHAP authentication succeeded
CHAP authentication succeeded
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0>]
Hangup (SIGHUP)
Modem hangup
Connection terminated.
To see if the issue didn't come from the network provider, I tried with another SIM card (from Vodafone NL), and even after reconfiguration, the connection hanged at the same time. I thus imagine that the issue must come either from the machine, either from my configuration.
Does anyone know where the issue might come from, or how I could investigate this more in detail?
Please let me know if you think any detail could help have a clearer view of the issue!
