Date: Sat, 8 Jan 2000 00:02:51 +0900 (JST) From: sumikawa@ebina.hitachi.co.jp To: asami@FreeBSD.ORG Cc: sumikawa@ebina.hitachi.co.jp Subject: Re: IPv6-enable ports Message-ID: <200001071502.AAA46153@prince.net.ebina.hitachi.co.jp> In-Reply-To: <vqc3dsakp95.fsf@silvia.hip.berkeley.edu> References: <200001061955.EAA34652@prince.net.ebina.hitachi.co.jp> <vqc3dsakp95.fsf@silvia.hip.berkeley.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
asami> That sounds fine, but what about packages? They will all be built
asami> without IPv6 support, right?
I think It should synchronize default kernel configuration. If kernel
is enabled IPv6 in default, the packages should be build with IPv6
support.
asami> Or is IPv6 support downwards compatible with IPv4? In that case I can
asami> set USE_INET6 in the build environment and be done with it.
Almost of applications work fine, but downwards compatibility is
depends on each implementations in general.
In IPv4/IPv6-mixed world, a typical host is assigned several IPv4/IPv6
addresses. In this case, applications must try to connect all of
address of the host until it make a success as below.
foreach an address from candidates {
try to connect an address;
if (failed)
next;
else
break;
}
This is too general explanation. Getaddrinfo() loop is used
concretely. See, http://www.kame.net/newsletter/19980604/.
However, it is possible that some of applications give up in first
trying. These programs quit right now, when a non-IPv6 kernel fails to
connect to an IPv6 host. It will be inconvenience for IPv4 users.
It's a kind of bug. But many programers have no experience of address
family independent programming.
Anyway, this releasing discussion is another issue, I believe. I'll go
ahead.
---
Munechika SUMIKAWA @ KAME Project / FreeBSD.org
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-ports" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200001071502.AAA46153>