>Is the application IPv6 aware? Is it possibly copying IPv6 hostent values
>(longer) to IPv4 sockaddr structures (shorter)?
>
>There is supposed to be a way for IPv4 clients to use IPv6 but I have not
>reviewed the manuals for awhile.
>
>...chris.
The application runs only IPv6 sockets, but on an IPv4 network, using
IPv4-mapped IPv6 addresses. Easy to make an IPv4-mapped IPv6 address; he last 4
bytes of the IPv6 address are the IPv4 address; it's preceded by two bytes of
X'FFFF', and the other 10 bytes are nulls. ( ::FFFF.nnn.nnn.nnn.nnn ). So, the
short answer is, I use IPv6 throughout the application, so I define the
sockaddr_in structures in the long format (sockaddr_in6 - 28 bytes). If it is
running on a system where IPv6 isn't enabled, I just use the beginning of that
structure as an IPv4 sockaddr_in (16 bytes). What I'm getting is, a connection
arrives and the full sockaddr_in6 structure that ACCEPT returns is not where I
told it to go; it's overlaying an existing one somewhere else. It's also offset
8 bytes to the right, which kills the 8 bytes after the sockaddr_in6, and isn't
good for the IP address itself, either. Why it goes somewhere in
hither-and-yonspace is, so far, beyond me.
R;
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