Hi Marcel,
> Hi Arun,
> please try to compose proper emails and not just forward or reply to
your own message to send it again.
> We are using atmodem plugin and are trying to get the PPP up and
> running. I am able to create and activate context, but the PPP link
> establishment seems to have issues.
>
> The list-context script returns:
>
> [ /generic ]
> [ /generic/primarycontext3 ]
> Username =
> Name = Internet access
> Settings = { Interface=ppp0 Netmask=255.255.255.255
> Method=static DomainNameServers=192.89.123.231,192.89.123.230,
> Address=109.240.91.14 }
>
> Active = 1
> AccessPointName = internet
> Password =
> Type = internet
>
> But for a PPP link, there needs to be two ip addresses, one local and
> one of the peer. Here in the settings you see only one IP address.
> No they don't have to be. Who says so. The second address of PPP is
totally irrelevant since it is a point-to-point link and we do interface
routing (route add default dev > ppp0).
> I collected the logs during the PPP link establishment, (frames and a
> brief detail about it)
>
> Sent from Ofono:
> Frame: 0x7e 0xff 0x7d 0x23 0xc0 0x21 0x7d 0x21 0x7d 0x21 0x7d 0x20
> 0x7d 0x2a 0x7d 0x22 0x7d 0x26 0x7d 0x20 0x7d 0x20 0x7d 0x20 0x7d 0x20
> 0x58 0x7b 0x7e
>
> 03 c021 1 (conf req) 1 (id) 0x000a (length) 2 (accm) 6 (length) 0000
> fcs
>
> Recv from Modem:
> Frame: 0x7e 0xff 0x7d 0x23 0xc0 0x21 0x7d 0x21 0x7d 0x21 0x7d 0x20
> 0x7d 0x34 0x7d 0x22 0x7d 0x26 0x7d 0x20 0x7d 0x20 0x7d 0x20 0x7d 0x20
> 0x7d 0x25 0x7d 0x26 0xd2 0x8a 0xde 0xd2 0x7d 0x27 0x7d 0x22 0x7d 0x28
> 0x7d 0x22 0xbf 0x7d 0x35 0x7e
>
> 3 c021 1 (conf req) 1 (id) 0x0034 2 6 0 0 0 0 5(magic num) 6 d2 8a de
> d2 7(protocol compression) 2 (id) 8 (addr, control compres) 2 fcs
>
>
> Frame: 0x7e 0xff 0x7d 0x23 0xc0 0x21 0x7d 0x22 0x7d 0x21 0x7d 0x20
> 0x7d 0x2a 0x7d 0x22 0x7d 0x26 0x7d 0x20 0x7d 0x20 0x7d 0x20 0x7d 0x20
> 0x31 0x7d 0x2f 0x7e
>
> 3 c021 2 (conf ack) 1 (id) 0x000a 2 6 0 0 0 0 fcs
>
> Sent from ofono:
> Frame: 0x7e 0xff 0x7d 0x23 0xc0 0x21 0x7d 0x22 0x7d 0x21 0x7d 0x20
> 0x7d 0x34 0x7d 0x22 0x7d 0x26 0x7d 0x20 0x7d 0x20 0x7d 0x20 0x7d 0x20
> 0x7d 0x25 0x7d 0x26 0xd2 0x8a 0xde 0xd2 0x7d 0x27 0x7d 0x22 0x7d 0x28
> 0x7d 0x22 0x54 0x7c 0x7e
>
> 3 c021 2 (conf ack) 1 0x0034 2 6 0000 5 6 d2 8a de d2 7 2 8 2 fcs
>
>
> Frame: 0x7e 0xff 0x3 0x80 0x21 0x1 0x1 0x0 0x22 0x3 0x6 0x0 0x0 0x0
> 0x0 0x81 0x6 0x0 0x0 0x0 0x0 0x83 0x6 0x0 0x0 0x0 0x0 0x82 0x6 0x0 0x0
> 0x0 0x0 0x84 0x6 0x0 0x0 0x0 0x0 0x80 0x52 0x7e
>
> 3 8021 1 (conf req) 1 (id) 0x0022 (length) 3 (ip) 6 0000 81(dns1) 6
> 0000 83(nbns1) 6 0000 82(dns2) 6 0000 84 (nbns2) 6 0000 fcs
>
> Recv from Modem:
> Frame: 0x7e 0xff 0x3 0x80 0x21 0x3 0x1 0x0 0x10 0x81 0x6 0xa 0xb 0xc
> 0xd 0x83 0x6 0xa 0xb 0xc 0xe 0x4d 0x4d 0x7e
> 3 8021 3(conf nak) 1 (id) 0x010 81 (dns1) 6 abcd 83 (dns2) 6 abce fcs
>
> Sent from ofono:
> Frame: 0x7e 0xff 0x3 0x80 0x21 0x1 0x2 0x0 0x22 0x3 0x6 0x0 0x0 0x0
> 0x0 0x81 0x6 0xa 0xb 0xc 0xd 0x83 0x6 0xa 0xb 0xc 0xe 0x82 0x6 0x0 0x0
> 0x0 0x0 0x84 0x6 0x0 0x0 0x0 0x0 0xad 0x7a 0x7e
>
> 3 8021 1 (conf ack) 2 (id) 0x0022 3 6 0000 81 6 abcd 83 6 abce 82 6
> 0000 84 6 0000 fcs
>
> Recv from Modem:
> Frame: 0x7e 0xff 0x3 0x80 0x21 0x3 0x2 0x0 0x10 0x81 0x6 0xa 0xb 0xc
> 0xd 0x83 0x6 0xa 0xb 0xc 0xe 0x33 0x95 0x7e
> 3 8021 3(conf nak) 2 (id) 0x010 81 (dns1) 6 abcd 83 (dns2) 6 abce fcs
>
> Sent from ofono:
> Frame: 0x7e 0xff 0x3 0x80 0x21 0x1 0x3 0x0 0x22 0x3 0x6 0x0 0x0 0x0
> 0x0 0x81 0x6 0xa 0xb 0xc 0xd 0x83 0x6 0xa 0xb 0xc 0xe 0x82 0x6 0x0 0x0
> 0x0 0x0 0x84 0x6 0x0 0x0 0x0 0x0 0xce 0x3a 0x7e
>
> 3 8021 1 (conf req) 3 (id) 0x0022 3 6 0000 81 6 abcd 83 6 abce 82 6
> 0000 84 6 0000 fcs
>
> Recv from Modem:
> Frame: 0x7e 0xff 0x3 0x80 0x21 0x1 0x1 0x0 0x4 0x0 0xb7 0x7e
> 3 8021 1 (conf req) 1 (id) 0 4 0 fcs
>
> Frame: 0x7e 0xff 0x3 0x80 0x21 0x4 0x3 0x0 0x10 0x82 0x6 0x0 0x0 0x0
> 0x0 0x84 0x6 0x0 0x0 0x0 0x0 0x34 0xcc 0x7e
> 3 8021 4 (conf reject) 3(id) 0x0010 82 6 0000 84 6 0000 fcs
>
> Sent from ofono:
> Frame: 0xff 0x3 0x80 0x21 0x2 0x1 0x0 0x4 0xcd 0x92 0x7e
> 3 8021 2 (conf ack) 1 (id) 0 4
>
> Frame: 0xff 0x3 0x80 0x21 0x1 0x4 0x0 0x16 0x3 0x6 0x0 0x0 0x0 0x0
> 0x81 0x6 0xa 0xb 0xc 0xd 0x83 0x6 0xa 0xb 0xc 0xe 0xe3 0x9 0x7e
>
> 3 8021 1 (conf req) 4 (id) 0x0016 3 6 0000 81 6 abcd 83 6 abce fcs
>
> Recv from modem:
> Frame: 0x7e 0xff 0x3 0x80 0x21 0x3 0x4 0x0 0x16 0x3 0x6 0x6d 0xf0 0x40
> 0xbe 0x81 0x6 0xc0 0x59 0x7b 0xe7 0x83 0x6 0xc0 0x59 0x7b 0xe6 0xc5
> 0xf1 0x7e
>
> 3 8021 3 (conf nak) 4 (id) 0x0016 3 (ip) 6 6d f0 40 be 81 (dns1) 6 c0
> 59 7b e7 83 (dns2) 6 c0 59 7b e6 fcs
>
> Sent from ofono:
> Frame: 0x7e 0xff 0x3 0x80 0x21 0x1 0x5 0x0 0x16 0x3 0x6 0x6d 0xf0 0x40
> 0xbe 0x81 0x6 0xc0 0x59 0x7b 0xe7 0x83 0x6 0xc0 0x59 0x7b 0xe6 0x2
> 0x9c 0x7e
>
> 3 8021 1 (conf req) 5 (id) 0x0016 3 6 6d f0 40 be 81 6 c0 59 7b e7 83
> 6 c0 59 7b e6 fcs
>
> Recv from Modem:
> Frame: 0x7e 0xff 0x3 0x80 0x21 0x2 0x5 0x0 0x16 0x3 0x6 0x6d 0xf0 0x40
> 0xbe 0x81 0x6 0xc0 0x59 0x7b 0xe7 0x83 0x6 0xc0 0x59 0x7b 0xe6 0xf4
> 0x6f 0x7e
>
> 3 8021 2 (conf ack) 5 (id) 0x0016 3 6 6d f0 40 be 81 6 c0 59 7b e7 83
> 6 c0 59 7b e6 fcs
>
> I could not find any issues in the state transition w.r.t the RFC, but
> I get only one IP address, what is going wrong? Could any one help?
> As I said above. Nothing is going wrong. It will just work :)
> Regards
> Marcel
I have used the "route add default dev ppp0" command and also added the
nameserver details to the resolv.conf file.
I can see that firefox (for example) is using the interface ppp0, but
there is nothing coming from modem for the packets sent across the link.
Wireshark shows the DNS queries sent across the ppp0 interface, but
nothing is received through the link from modem.
The same modem, works perfectly with wvdial, and i get 2 ip addresses
after ppp negotiation. I tried replacing the AT+CGDATA with ATD *99# in
ofono, but the result is same.
I also tried by setting few QoS parameters and nothing seems to resolve
this issue.
Also ifconfig lists the ppp0 interface created as
ppp0 Link encap:UNSPEC HWaddr
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
You can see that the Link encap is showing UNSPEC, but in actual it
should be Point-to-Point, and also the HW address, is set as 00, and
there should not be this option at all.
I tried to set the negotiated ip address to the interface using ifconfig
and also using ioctl, but all fails with error.
Definitely there is something wrong with the PPP link establishment or
the way interface is created, but I am unable to pin point where the
issue is.
Any help is highly appreciated.
Regards
Arun Ravindran
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