Re: IPv6 socket programming
On Wed, May 23, 2001 at 05:16:43PM +0300, Tommi Komulainen wrote:
> Since this was meant as an example, I guess you want to use the following
> instead of plain bind(skt):
> bind(skt, res->ai_addr, res->ai_addrlen)
Sorry, I should of used bind(skt...)
> OTOH, in linux, if you bind an IPv6 socket to a port, you can't bind an
> IPv4 socket to the same port anymore, the call will fail with 'Address
> already in use'. Instead, the IPv6 socket would get all IPv4 packets as
> well. Basically you should just break out of the loop after the listen,
> assuming all the preceding calls succeeded.
Ah hence the "great bind doesn't work right" email debate last month.
(it wasn't a flame, it was very constructive).
Am I guaranteed that the first item in the res linked list will be
the IPv6 address? If the list is random, then I'll randomly bind to a
IPv4 or IPv6 address depending on how the library feels.
> Someone correct me if I'm wrong, but I think this different behaviour of
> bind() is the current showstopper for writing portable IPv6 applications.
It seems that way. That's unfortunate.
- Craig
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Craig Small VK2XLZ GnuPG:1C1B D893 1418 2AF4 45EE 95CB C76C E5AC 12CA DFA5
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