Reg: IPv6 on MC7354

Tue Feb 7 23:08:25 UTC 2017

Thanks Bjorn for the reply, I got the idea and it works for me well.

Do you have any suggestions/ idea on creating dual stack connections on
single /dev/cdc-wdm device ? we are getting 'Policy Mismatch error'.

Thanks
Balaji

On Tue, Feb 7, 2017 at 4:06 PM, Bjørn Mork <bjorn at mork.no> wrote:

> Balaji Sivakumar <shivbalaji1985 at gmail.com> writes:
>
> > Hi,
> >
> > I am able to start the network using ip-type for ipv6 and it is getting
> > connected. Also able to get the current settings using
> > "--wds-get-current-settings". But the thing am not getting the expected
> the
> > Ipv6 address , it is getting generated on the fly whenever we read
> current
> > settings. Am always getting expected dns ip address "IPv6 primary DNS".
> >
> > did anyone face this  issue? any suggestions.
>
> This is normal.  The modem is assigned a /64 prefix, which is what it
> will announce in the RAs.  You can use whatever address you want within
> this prefix.  They will all work.
>
> The modem generates what seems to be pseudo random interface ids, and a
> new one for every request like you have noticed. I recommend using one
> of the standard addrgenmodes instead.
>
> The exact same behaviour can be observed with an EM7455 in MBIM mode.
> Getting a new address for every IP config request, but notice that the
> prefix stays the same:
>
>
> root at miraculix:/tmp#  mbimcli -p -d /dev/cdc-wdm0
> --query-ip-configuration=0
>
> [/dev/cdc-wdm0] IPv4 configuration available: 'address, gateway, dns, mtu'
>      IP [0]: '10.169.23.118/30'
>     Gateway: '10.169.23.117'
>     DNS [0]: '193.213.112.4'
>     DNS [1]: '130.67.15.198'
>         MTU: '1500'
>
> [/dev/cdc-wdm0] IPv6 configuration available: 'address, gateway, dns, mtu'
>      IP [0]: '2a02:2121:2c3:d006:8dc7:5dd9:4c49:58fd/64'
>     Gateway: '2a02:2121:2c3:d006:b0c3:7e25:7b93:fcbc'
>     DNS [0]: '2001:4600:4:fff::52'
>     DNS [1]: '2001:4600:4:1fff::52'
>         MTU: '1500'
> root at miraculix:/tmp#  mbimcli -p -d /dev/cdc-wdm0
> --query-ip-configuration=0
>
> [/dev/cdc-wdm0] IPv4 configuration available: 'address, gateway, dns, mtu'
>      IP [0]: '10.169.23.118/30'
>     Gateway: '10.169.23.117'
>     DNS [0]: '193.213.112.4'
>     DNS [1]: '130.67.15.198'
>         MTU: '1500'
>
> [/dev/cdc-wdm0] IPv6 configuration available: 'address, gateway, dns, mtu'
>      IP [0]: '2a02:2121:2c3:d006:3864:624d:ba7f:9cc3/64'
>     Gateway: '2a02:2121:2c3:d006:b0c3:7e25:7b93:fcbc'
>     DNS [0]: '2001:4600:4:fff::52'
>     DNS [1]: '2001:4600:4:1fff::52'
>         MTU: '1500'
> root at miraculix:/tmp#  mbimcli -p -d /dev/cdc-wdm0
> --query-ip-configuration=0
>
> [/dev/cdc-wdm0] IPv4 configuration available: 'address, gateway, dns, mtu'
>      IP [0]: '10.169.23.118/30'
>     Gateway: '10.169.23.117'
>     DNS [0]: '193.213.112.4'
>     DNS [1]: '130.67.15.198'
>         MTU: '1500'
>
> [/dev/cdc-wdm0] IPv6 configuration available: 'address, gateway, dns, mtu'
>      IP [0]: '2a02:2121:2c3:d006:794a:cd8a:6b42:5952/64'
>     Gateway: '2a02:2121:2c3:d006:b0c3:7e25:7b93:fcbc'
>     DNS [0]: '2001:4600:4:fff::52'
>     DNS [1]: '2001:4600:4:1fff::52'
>         MTU: '1500'
>
>
> The address actually assigned by NM is none of the above:
>
> root at miraculix:/tmp# ip addr show dev wwan0
> 11: wwan0: <BROADCAST,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc
> pfifo_fast state UNKNOWN group default qlen 1000
>     link/ether 52:55:d2:c6:23:af brd ff:ff:ff:ff:ff:ff
>     inet 10.169.23.118/30 brd 10.169.23.119 scope global wwan0
>        valid_lft forever preferred_lft forever
>     inet6 2a02:2121:2c3:d006:f80d:e8fa:714a:a351/64 scope global
>        valid_lft forever preferred_lft forever
>
>
> You can also use nice "short" addresses if you like. This works, for
> example:
>
> root at miraculix:/tmp# ip addr add 2a02:2121:2c3:d006:: dev wwan0
> root at miraculix:/tmp# traceroute6 -s 2a02:2121:2c3:d006:: google.com
> traceroute to google.com (2a00:1450:400f:807::200e) from
> 2a02:2121:2c3:d006::, port 33434, from port 49907, 30 hops max, 60 bytes
> packets
>  1  2a02:2121:2c3:d006:0:9:8dcc:b040 (2a02:2121:2c3:d006:0:9:8dcc:b040)
> 262.977 ms  45.760 ms  169.485 ms
>  2  * * *
>  3  2a02:2120::2000:0:0:31 (2a02:2120::2000:0:0:31)  177.944 ms  61.263
> ms  177.280 ms
>  4  ti280830540j370-ae1-20.ti.telenor.net (2001:4600:a:101::5b2)  61.289
> ms  177.334 ms  50.776 ms
>  5  ti0001a401-ae14-21.ti.telenor.net (2001:4600:9:500:1::55)  177.736
> ms  51.664 ms  78.161 ms
>  6  ti0300c360-lo0-0.ti.telenor.net (2001:4600:0:100::2a)  60.457 ms
> 88.834 ms  55.538 ms
>  7  ti3163c360-lo0-0.ti.telenor.net (2001:4600:0:100::10)  87.000 ms
> 55.456 ms  27.921 ms
>  8  ti3001b400-lo0-0.ti.telenor.net (2001:4600::11)  55.952 ms  29.897
> ms  66.357 ms
>  9  2001:4860:1:1:0:847:: (2001:4860:1:1:0:847::)  29.933 ms  66.192 ms
> 70.005 ms
> 10  2001:4860::1:0:26eb (2001:4860::1:0:26eb)  66.107 ms  69.878 ms
> 53.959 ms
> 11  2001:4860:0:1::1013 (2001:4860:0:1::1013)  71.772 ms  54.994 ms
> 55.003 ms
> 12  arn09s11-in-x0e.1e100.net (2a00:1450:400f:807::200e)  53.523 ms
> 54.239 ms  89.773 ms
>
>
>
> Hope you get the idea..
>
>
>
> Bjørn
>
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