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,
--
Julien Soula,
Ingenieur Reseau,
DSI/ULR2694,
Universite de Lille,
tel (0)3 20 62 34 55
