<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><blockquote type="cite"><div><font>I have found out that Live555 uses TTL 0 multicast message in order to find its own IP address.</font></div></blockquote><div><br></div><div>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.</div><div><br></div><div>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:</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>- Call "gethostname()" to get the computer's domain name; then</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>- Call "getaddrinfo()" (or "gethostbyname()" if "getaddrinfo()" is not available), to resolve this name into an IP address.</div><div><br></div><div>If both of these techniques (multicast loopback and "gethostname()"/"getaddrinfo()") fail, then it usually means that your network interface is not configured properly.</div><div><br></div><div><br></div><blockquote type="cite"><div>Solution like that might sound dubious, but there must be a reasonable explanation for such an implementation.</div>
<div><font>Network configurations? Portability? Although it seems that it creates more problems (on some network configurations, including mine).</font></div></blockquote><div><br></div>Actually, on most configurations, it works just fine.</div><div><br></div><div><br><blockquote type="cite"><div>I just switched to usual IP query</div></blockquote><div><br></div>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).</div><br><div apple-content-edited="true">
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; ">Ross Finlayson<br>Live Networks, Inc.<br><a href="http://www.live555.com/">http://www.live555.com/</a></span></span>
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