Quoting nn hust <nzjem...@gmail.com> from ml.softs.gtk-gnutella.devel:
:How do Ultrapeer notice its address to the Gnutella network£¬so leaves can
:connect to it¡£Does it broadcast its address timely or do something else£¿
During Gnutella handshakes, the IP address is communicated by replying servents
through the Remote-IP header.
During HTTP exchanges, this is done through the X-Remote-IP header.
For instance, if your external IP address is 1.2.3.4 and you connect to the
host 5.6.7.8 through HTTP, then that host will echo:
X-Remote-IP: 1.2.3.4
in the HTTP reply, letting 1.2.3.4 know what its external IP address is on
that particular connection.
Gtk-gnutella monitors the IP address that is echoed to it by other servents
and as soon as 3 different peers report the same IP, it considers that IP to
be the one it bears externally.
Raphael
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