[Olsr-users] IPv6: Using link-local all-hosts multicast address ff02::1 instead of ff0e::1 with Linux?

[Hannes Gredler]

On Wed, Aug 20, 2008 at 02:45:17AM -0700, Joerg Pommnitz wrote:
| Hello all,
| I'm trying to use ff02::1 instead of the default ff0e::1 as multicast 
| address for OLSR in IPv6. Unfortunately I always get "Network is 
| unreachable".
| Besides the code in olsrd-0.5.3 I tried the following modifications:
| 1) use sendmsg instead of sendto. With sendmsg one can add a control 
| message to the data and specify the interface to use for the outbound 
| data. This is what ping6 uses ("ping6 ff02::1" fails while "ping6 -I 
| interface ff02::1" works as expected). Unfortunately that did not work.
| 
| 2) set the sin6_scope_id to the desired interface index. No joy either.
| 
| Now I'm out of ideas. The reason I'm trying to use a link local address is 
| that nrlsmf routes any non link-local multicast packets and floods them 
| through the MANET. This is obviously not what we want, but I can't really 
| blame nrlsmf.

why don't you scope your messages with a TTL, pardon HLIM of 1 ? - /hannes