binding on IPv6
aland at deployingradius.com
Fri Jan 11 10:50:01 CET 2008
Stefan Winter wrote:
> A colleague of mine played around with netcat and FR and straced both. There
> is one difference in the socket() call:
> netcat, IPv4, UDP:
> socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP) = 3
> setsockopt(3, SOL_SOCKET, SO_REUSEADDR, , 4) = 0
Ah. SO_REUSEADDR means "allow multiple programs to listen on the
> The difference being: socket(..., IPPROTO_UDP <-> IPPROTO_IP) (the
> setsockopt looks harmless, but not sure).
I don't think that's it.
> Why that would be a difference is not clear to me. A wild guess is that
> SOCK_DGRAM+IPPROTO_IP binds to all datagram-based IP payload protocols, which
> may be more than UDP, and that one of those non-UDP bindings clashes when
> trying to bind, even to an IPv6 address. Weird.
If netcat is listening on IP sockets, there are less issues with
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