[ECOS] Help for ECOS PPP setup in Germany with T-Mobile network via GPRS Modem

[Weili Yao]

Hello, there:
   We are having problem with ECOS PPP via GPRS Modem in Germany. The APN is T-Mobile network, and we believed that we have correctly set the PIN to the SIM card, the APN init string and username/password to the ECOS. It passed the CHAT and LCP handshaking, but it failed at IPCP, because we set initial local/remote IP address to 0.0.0.0, and the T-mobile server takes our local 0.0.0.0 suggestion. Here is the data captured:

==========================
PPP Config diagnostic reply : Connect: ppp0 <--> /dev/adapt_ser_3
<COM2>FF 03 C0 21 01 01 00 14 02 06 00 00 00 00 05 06 53 05 F6 9C 07 02 08 02 ==>to server
<COM2>FF 03 C0 21 01 01 00 16 01 04 05 DC 02 06 00 00 00 00 07 02 08 02 03 04 C0 23 <== from PPP server 
<COM2>FF 03 C0 21 02 01 00 16 01 04 05 DC 02 06 00 00 00 00 07 02 08 02 03 04 C0 23==> to PPP server
<COM2>FF 03 C0 21 04 01 00 0A 05 06 53 05 F6 9C <== from PPP server 
<COM2>FF 03 C0 21 01 02 00 0E 02 06 00 00 00 00 07 02 08 02 ==> to PPP server 
<COM2>FF 03 C0 21 02 02 00 0E 02 06 00 00 00 00 07 02 08 02 <== from PPP server
<COM2>FF 03 C0 21 09 00 00 08 00 00 00 00 ==> to PPP server
<COM2>FF 03 C0 23 01 01 00 10 05 67 75 65 73 74 05 67 75 65 73 74 ==> to PPP server
<COM2>FF 03 C0 21 0A 00 00 08 00 00 00 00 <== from PPP server
<COM2>FF 03 C0 23 02 01 00 0D 08 57 65 6C 63 6F 6D 65 21 <== from PPP server
PPP Config diagnostic reply : Remote message: Welcome!

<COM2>FF 03 80 21 01 01 00 10 03 06 00 00 00 00 02 06 00 2D 0F 01<< send Conf Req to PPP server, can we be ip=0.0.0.0, vJcompress
<COM2>FF 03 80 21 01 01 00 0A 03 06 C0 A8 6F 6F << get Conf Req, server is at ip=192.168.111.111
<COM2>FF 03 80 21 02 01 00 0A 03 06 C0 A8 6F 6F << send Conf Ack, we are happy with server being ip=192.168.111.111
<COM2>FF 03 80 21 04 01 00 0A 02 06 00 2D 0F 01 << get Conf Reject, server doesnt like vJcompress
<COM2>FF 03 80 21 01 02 00 0A 03 06 00 00 00 00 << send Conf Req, can we be ip=0.0.0.0
<COM2>FF 03 80 21 02 02 00 0A 03 06 00 00 00 00 << get Conf Ack, yes server is happy if we want to be ip=0.0.0.0
PPP Config diagnostic reply : Could not determine local IP address    << ECOS doesn't like the server accepting our suggestion of 0.0.0.0
<COM2>FF 03 80 21 05 03 00 28 43 6F 75 6C 64 20 6E 6F 74 20 64 65 74 65 72 6D 69 6E 65 20 6C 6F 63 61 6C 20 49 50 20 61 64 64 72 65 73 << send message "Could not determine local IP address"
<COM2>FF 03 C0 21 05 02 00 04 << get LCP Terminate request
PPP Config diagnostic reply : LCP terminated by peer
<COM2>FF 03 C0 21 06 02 00 04 << set LCP Terminate ACK.

===================================

The same application code is running fine in U.S.A with T-Mobile and Cingular Networks. But somehow it does not get through with Germany T-Mobile network. Does anybody have any suggestions or ideas about the problem?

Thank you very much!

Weili Yao


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