RPL global DODAG repair

[FruechteBini]

Hi guys!

I am currently working on implementing RPL on native in RIOT and need help doing a global DODAG repair.

My Setup:

• I have a root (tap0) and two nodes (tap1 & tap2) all running on native.

Currently working:

I am doing my initialization of the RPL as shown in the rpl-example (https://github.com/RIOT-OS/RIOT/wiki/Tutorial:-RIOT-and-Multi-Hop-Routing-with-RPL)

• On the root (tap0) & all nodes(tap1&tap2):
  gnrc_rpl_init(6);

• On the root (tap0) only:

    ipv6_addr_t dodag_id;
    ipv6_addr_from_str(&dodag_id, "2001:db8::1");
    const gnrc_netif_t* netif = gnrc_netif_get_by_pid(6);
    gnrc_netif_ipv6_addr_add(netif, &dodag_id, 64, GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_VALID);
    gnrc_rpl_root_init(1, &dodag_id, false, false);

So far, this is working & the rpl/DODAG is built correctly, parents can be shown using "rpl".

My Issue:

But my goal is to later disable connections as described in https://github.com/RIOT-OS/RIOT/wiki/Virtual-riot-network (using ebtables DROP).
So I tried to do a global repair by just incrementing the rpl instance. For this purpose I looked into the dodag.h (https://riot-os.org/api/dodag_8h.html) and tried it like this:

uint8_t dodag_instance = 1;

gnrc_rpl_instance_remove_by_id(dodag_instance)
dodag_instance++;
gnrc_rpl_instance_t* current_instance = gnrc_rpl_root_instance_init(dodag_instance, &dodag_id, 2);
gnrc_rpl_dodag_init(current_instance, &dodag_id, 6);

This is working aswell. BUT only on tap0, the root ("rpl" shows the incremented rpl instance). As it seems, the function gnrc_rpl_instance_remove_by_id is not notifying the other nodes it shuts the DODAD down.

The other nodes (tap1 and tap2) still run on rpl instance 1. I have tried initializing them again but it did not do the trick.

As I am pretty new to network programming & RIOT I am slightly confused on what function to use to completely clean all nodes & set up a new DODAG.

Every hint & reference is appreciated, thanks in advance!

[FruechteBini]

Figured out that the RIOT rpl implementation does a global repair (i think so at least) on default - after 5 minutes. I just edited sys/include/net/gnrc/rpl.h lines 291-295:

 #ifndef GNRC_RPL_DEFAULT_LIFETIME
 #define GNRC_RPL_DEFAULT_LIFETIME (5)
 #endif
 #ifndef GNRC_RPL_LIFETIME_UNIT
 #define GNRC_RPL_LIFETIME_UNIT (60)

and changed the values (in my case 1&5 to make it refresh every 5 seconds).