hello,

we found a problem in using updcast in a context of multi-routers when the rdv-addr is not multicast.

Indeed, in this case, the multicast ttl must be greater than 1 (--ttl). But it is only assign during the processing of rdv-addr and only if rdv-addr is a multicast IP :

udps-negotiate.c: /* Only do the following if controlMcastAddr is indeed an mcast address ... */ if(isMcastAddress(&net_config->controlMcastAddr)) { setMcastDestination(sock[0], net_config->net_if, &net_config->controlMcastAddr); setTtl(sock[0], net_config->ttl);

But it is not assign during the processing of data-addr :

udps-negotiate.c: if(isMcastAddress(&net_config->dataMcastAddr)) setMcastDestination(sock, net_config->net_if, &net_config->dataMcastAddr);

Therefore, if rdv-addr is unicast then TTL remains to 1.

So I suggest to patch the code this way :

- if(isMcastAddress(&net_config->dataMcastAddr)) + if(isMcastAddress(&net_config->dataMcastAddr)) { setMcastDestination(sock, net_config->net_if, &net_config->dataMcastAddr); + setTtl(sock, net_config->ttl); + }

Best regards,