Dual-stack 3G connections

A few months ago, I received two test SIM cards for Orange Poland’s new IPv6 network.

The interesting thing about this network is that it’s running IPv6 in a fairly unusual configuration and it was interesting to see how to get that work on Ubuntu.

This network uses two separate APNs, one for IPv4 (internet) and one for IPv6 (internetipv6).
Using two separate APNs is certainly easier on the carrier’s infrastructure side as they can get IPv6 online without actually changing anything on the IPv4 equipement, however that means that any client wanting to use both protocols at once needs to use multiple PDP contexts.

I’m now going to detail how to manually configure ppp to connect to such a network:
/etc/ppp/peers/orange

noauth
connect "/usr/sbin/chat -e -f /etc/ppp/peers/orange-connect"
/dev/ttyACM0
460800
+ipv6

/etc/ppp/peers/orange-connect

TIMEOUT 5
ABORT BUSY
ABORT 'NO CARRIER'
ABORT VOICE
ABORT 'NO DIALTONE'
ABORT 'NO ANSWER'
ABORT DELAYED
ABORT ERROR
'' \nAT
TIMEOUT 12
OK ATH
OK ATE1
OK 'AT+CGDCONT=1,"IP","internet"'
OK 'AT+CGDCONT=2,"IPV6","internetipv6"'
OK ATD*99#
CONNECT ""

Then all that’s needed is a good old:

pon orange

And a few seconds later, I’m getting the following on ppp0:

ppp0      Link encap:Point-to-Point Protocol  
          inet addr:87.96.119.169  P-t-P:10.6.6.6  Mask:255.255.255.255
          inet6 addr: 2a00:f40:2100:ac9:8c1e:da60:93e2:c234/64 Scope:Global
          inet6 addr: 2a00:f40:2100:ac9::1/64 Scope:Global
          inet6 addr: fe80::1/10 Scope:Link
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:13 errors:0 dropped:0 overruns:0 frame:0
          TX packets:23 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:354 (354.0 B)  TX bytes:767 (767.0 B

This config should work for any mobile network using a similar setup (likely to become more and more popular as the various RIRs are running out of IPv4).

Sadly ModemManager/NetworkManager don’t support mutliple PDP contexts yet, though it’s being discussed upstream, so we can hope to see something land soon.

Apparently multiple PDP contexts support is also dependant on hardware. In my case, I’ve been using an “old” Nokia E51 over USB as I didn’t have any luck getting that to work with an Android phone. My Nokia N900 also worked but required a custom kernel to be installed first to properly handle IPv6.

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