> I have found out that Live555 uses TTL 0 multicast message in order to find
> its own IP address.
Yes, this is the *first* thing that it tries, because - despite what you might
think - is an approach that is very effective and portable across many
different OSs.
However, it's important to realize that this is not the *only* technique that
it tries. If the 'multicast loopback' technique fails, then the code then
tries a second technique - one that is more conventional, but less portable:
- Call "gethostname()" to get the computer's domain name; then
- Call "getaddrinfo()" (or "gethostbyname()" if "getaddrinfo()" is not
available), to resolve this name into an IP address.
If both of these techniques (multicast loopback and
"gethostname()"/"getaddrinfo()") fail, then it usually means that your network
interface is not configured properly.
> Solution like that might sound dubious, but there must be a reasonable
> explanation for such an implementation.
> Network configurations? Portability? Although it seems that it creates more
> problems (on some network configurations, including mine).
Actually, on most configurations, it works just fine.
> I just switched to usual IP query
I don't know what "usual IP query" is supposed to mean, but - as noted above -
you should check to make sure that your network interface is configured
properly (and has a router for 224.0.0.0/8 - i.e., for IP multicast).
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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