No incoming data: GPRS, kernel 2.6.9, ppp 2.4.2

Hi

I have a problem using Ericsson phones (T39M and F251M) for GPRS with pppd 2.4.2 and kernel 2.6.9.

The connection seems to go through fine. I can send any amount of outgoing data. But I never get more than 3 or 4 packets of incoming data. About 3 times out of 10 the connection works perfectly, and stays connected indefinitely. I can see no difference in the logs between successful connections and unsuccessful connections, except for this lack of incoming data.

I can use GPRS on several other phones with no problems.

I can use these Ericsson phones for GPRS on a machine running kernel 2.4.26, with the identical pppd binary, config files and chat script copied across.

Is there any known problem with ppp 2.4.2 and kernel 2.6.9? Any clues as to what might cause intermittent one-way connecitons?

Thanks for your time,
Julian

# pppd file /etc/ppp.conf

# cat /etc/ppp.conf
/dev/ttyS0 
ipparam dialup 
57600 
crtscts 
modem 
lock 
receive-all 
nopcomp 
noaccomp 
nomagic 
noccp 
novj 
novjccomp 
nodetach 
noipdefault 
defaultroute 
usepeerdns 
user  web 
connect '/usr/sbin/chat -e -S -f /etc/chat_connect -v' 
disconnect '/usr/sbin/chat -e -S -f /etc/chat_disconnect -v' 

# cat /etc/chat_connect 
ABORT           'BUSY' 
ABORT           'NO ANSWER' 
ABORT           'NO CARRIER' 
ABORT           'NO DIALTONE' 
ABORT           'NO DIAL TONE' 
ABORT           'VOICE' 
ABORT           'ERROR' 
'' AT
TIMEOUT 10
OK ATE0
OK ATV1
OK 'AT+CGDCONT=4,"IP","internet"'
OK AT+CGQREQ=4,0,0,0,0,0
OK AT+CGQMIN=4,0,0,0,0,0
OK ATDT*99***4#
TIMEOUT 22
CONNECT ""

# cat /etc/chat_disconnect 
SAY "\nDisconnect...\n"
"" "\K"
"" "+++ATH"
"" "+++ATH"
"" "+++ATH"
SAY "\nDisconnected.\n"

Here is a SUCCESSFUL connection
------------------------------

May 29 11:19:51 [pppd] pppd 2.4.2 started by root, uid 0
May 29 11:19:55 [pppd] Serial connection established.
May 29 11:19:55 [pppd] using channel 3
May 29 11:19:55 [pppd] Using interface ppp0
May 29 11:19:55 [pppd] Connect: ppp0 <--> /dev/ttyS0
May 29 11:19:56 [pppd] sent [LCP ConfReq id=0x1 <asyncmap 0x0>]
May 29 11:19:56 [pppd] rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <pcomp> <accomp> <auth pap>]
May 29 11:19:56 [pppd] sent [LCP ConfRej id=0x1 <pcomp> <accomp>]
May 29 11:19:56 [pppd] rcvd [LCP ConfAck id=0x1 <asyncmap 0x0>]
May 29 11:19:56 [pppd] rcvd [LCP ConfReq id=0x2 <asyncmap 0x0> <auth pap>]
May 29 11:19:56 [pppd] sent [LCP ConfAck id=0x2 <asyncmap 0x0> <auth pap>]
May 29 11:19:56 [pppd] sent [PAP AuthReq id=0x1 user="web" password=<hidden>]
May 29 11:19:59 [pppd] sent [PAP AuthReq id=0x2 user="web" password=<hidden>]
May 29 11:19:59 [pppd] rcvd [PAP AuthAck id=0x2 ""]
May 29 11:19:59 [pppd] PAP authentication succeeded
May 29 11:19:59 [pppd] sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
May 29 11:20:02 [pppd] sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
May 29 11:20:03 [pppd] rcvd [IPCP ConfReq id=0x1 <addr 10.164.255.254>]
May 29 11:20:03 [pppd] sent [IPCP ConfAck id=0x1 <addr 10.164.255.254>]
May 29 11:20:03 [pppd] rcvd [IPCP ConfNak id=0x1 <addr 10.164.11.70> <ms-dns1 172.29.129.11> <ms-dns3 172.29.129.11>]
May 29 11:20:03 [pppd] sent [IPCP ConfReq id=0x2 <addr 10.164.11.70> <ms-dns1 172.29.129.11> <ms-dns3 172.29.129.11>]
                - Last output repeated twice -
May 29 11:20:06 [pppd] rcvd [IPCP ConfAck id=0x2 <addr 10.164.11.70> <ms-dns1 172.29.129.11> <ms-dns3 172.29.129.11>]
May 29 11:20:06 [pppd] not replacing existing default route to eth0 [192.168.1.2]
May 29 11:20:06 [pppd] local  IP address 10.164.11.70
May 29 11:20:06 [pppd] remote IP address 10.164.255.254
May 29 11:20:06 [pppd] primary   DNS address 172.29.129.11
May 29 11:20:06 [pppd] secondary DNS address 172.29.129.11
May 29 11:20:06 [pppd] Script /etc/ppp/ip-up started (pid 2681)
May 29 11:20:06 [pppd] Script /etc/ppp/ip-up finished (pid 2681), status = 0x1
May 29 11:21:21 [pppd] Terminating on signal 15.
May 29 11:21:21 [pppd] Script /etc/ppp/ip-down started (pid 4164)
May 29 11:21:21 [pppd] sent [LCP TermReq id=0x2 "User request"]
May 29 11:21:21 [pppd] rcvd [LCP TermAck id=0x2]
May 29 11:21:21 [pppd] Connection terminated.
May 29 11:21:21 [pppd] Connect time 1.5 minutes.
May 29 11:21:21 [pppd] Sent 15132 bytes, received 3557 bytes.
May 29 11:21:21 [pppd] Serial link disconnected.
May 29 11:21:22 [pppd] Waiting for 1 child processes...
May 29 11:21:22 [pppd] script /etc/ppp/ip-down, pid 4164
May 29 11:21:22 [pppd] Script /etc/ppp/ip-down finished (pid 4164), status = 0x1
May 29 11:21:22 [pppd] Exit.

and here is an UNSUCCESSFUL connection
--------------------------------------

May 29 11:22:20 [pppd] pppd 2.4.2 started by root, uid 0
May 29 11:22:24 [pppd] Serial connection established.
May 29 11:22:24 [pppd] using channel 4
May 29 11:22:24 [pppd] Using interface ppp0
May 29 11:22:24 [pppd] Connect: ppp0 <--> /dev/ttyS0
May 29 11:22:25 [pppd] sent [LCP ConfReq id=0x1 <asyncmap 0x0>]
May 29 11:22:25 [pppd] rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <pcomp> <accomp> <auth pap>]
May 29 11:22:25 [pppd] sent [LCP ConfRej id=0x1 <pcomp> <accomp>]
May 29 11:22:25 [pppd] rcvd [LCP ConfAck id=0x1 <asyncmap 0x0>]
May 29 11:22:25 [pppd] rcvd [LCP ConfReq id=0x2 <asyncmap 0x0> <auth pap>]
May 29 11:22:25 [pppd] sent [LCP ConfAck id=0x2 <asyncmap 0x0> <auth pap>]
May 29 11:22:25 [pppd] sent [PAP AuthReq id=0x1 user="web" password=<hidden>]
May 29 11:22:28 [pppd] sent [PAP AuthReq id=0x2 user="web" password=<hidden>]
May 29 11:22:28 [pppd] rcvd [PAP AuthAck id=0x2 ""]
May 29 11:22:28 [pppd] PAP authentication succeeded
May 29 11:22:28 [pppd] sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
                - Last output repeated twice -
May 29 11:22:32 [pppd] rcvd [IPCP ConfReq id=0x1 <addr 10.164.255.254>]
May 29 11:22:32 [pppd] sent [IPCP ConfAck id=0x1 <addr 10.164.255.254>]
May 29 11:22:32 [pppd] rcvd [IPCP ConfNak id=0x1 <addr 10.164.6.237> <ms-dns1 172.29.129.11> <ms-dns3 172.29.129.11>]
May 29 11:22:32 [pppd] sent [IPCP ConfReq id=0x2 <addr 10.164.6.237> <ms-dns1 172.29.129.11> <ms-dns3 172.29.129.11>]
May 29 11:22:32 [pppd] rcvd [IPCP ConfAck id=0x2 <addr 10.164.6.237> <ms-dns1 172.29.129.11> <ms-dns3 172.29.129.11>]
May 29 11:22:32 [pppd] local  IP address 10.164.6.237
May 29 11:22:32 [pppd] remote IP address 10.164.255.254
May 29 11:22:32 [pppd] primary   DNS address 172.29.129.11
May 29 11:22:32 [pppd] secondary DNS address 172.29.129.11
May 29 11:22:32 [pppd] Script /etc/ppp/ip-up started (pid 5527)
May 29 11:22:32 [pppd] Script /etc/ppp/ip-up finished (pid 5527), status = 0x1
May 29 11:24:07 [pppd] Terminating on signal 15.
May 29 11:24:07 [pppd] Script /etc/ppp/ip-down started (pid 7463)
May 29 11:24:07 [pppd] sent [LCP TermReq id=0x2 "User request"]
May 29 11:24:07 [pppd] Script /etc/ppp/ip-down finished (pid 7463), status = 0x1
May 29 11:24:07 [pppd] rcvd [LCP TermAck id=0x2]
May 29 11:24:07 [pppd] Connection terminated.
May 29 11:24:07 [pppd] Connect time 1.8 minutes.
May 29 11:24:07 [pppd] Sent 12758 bytes, received 54 bytes.
May 29 11:24:08 [pppd] Serial link disconnected.
May 29 11:24:09 [pppd] Exit.

# uname -a 
Linux wiredocean 2.6.9 #2 SMP Tue Nov 16 14:01:25 GMT 2004 i686 VIA Samuel 2 CentaurHauls GNU/Linux

Motherboards are EPIA-M rev B

I have more information that is relevant here.

The T39 works on the machine with the 2.4 kernel only with
options ppp_async flag_time=0

How can I set flag_time=0 using a 2.6 kernel?

I tried modifying drivers/net/ppp_async.c directly, adding:

	module_param(flag_time, int,  0);

but it didn't work.

Any ideas?

thanks, Julian