Arjen Smit <smit.ar...@gmail.com> writes: > This question actually does extend to IPv6, here also via the available > control protocol (QMI/AT/etc) the connection is initiated. It is the modem > firmware that runs a SLAAC client process to receive a /64 prefix. Then > the data interface on the host is able retrieve that prefix (via a > SLAAC/DHCPv6 client procedure (depending on the modem firmware > capabilities) from the modem. Also here the alternative option exists to > retrieve the IPv6 prefix (+ other items like Ipv6DNS, MTU size, or even PD > - (e.g quectel AT+QIP6CFG="PD_addr") via the control interface from the > modem and apply the result to the data interface. > > What is the modem manager approach in this ? It looks like always the data > interface needs to use DHCP/SLAAC kind of client processes. As I prefer to > be independent of specific modem firmware (DHCP) server processes (which > are often outdated/have limited DHCP options supported) I am interested to > understand the pros/cons of the above approach (and the modem manager > support of this approach).
I'm extremely interested in generic solutions to this problem. My understanding is that we can only make one side of the client <-> network generic. If you want to use DHCPv6 agaist a generic network, then you depend on a specific modem firmware implementation. There is no way for MM to inject link local packets on the gtp link. And there is no universal proxying/relaying of DHCPv6 in modem firmware. Is this correct? If correct, which modem firmwares and methods are there supporting DHCPv6-PD? That Quectel command looks very promising. But are there similar solutions for e.g Sierra Wireless modems? Others? Using routed DHCPv6 wrapped in DHCPv6 relay-forward messages would allow a generic client solution regardless of modem firmware. But it becomes very network dependent since you'd need a co-operating PGW and DHCPv6-server. Interesting in hearing about such deployments, if anyone knows of one. Generally: Are there anyone actually using DHCPv6-PD on a mobile network? I.e outside the lab. How do you do that? Bjørn
