Date: Sat, 29 Sep 2001 17:35:35 +0900 From: JINMEI Tatuya / =?ISO-2022-JP?B?GyRCP0BMQEMjOkgbKEI=?= <jinmei@isl.rdc.toshiba.co.jp> To: freebsd-net@FreeBSD.ORG Subject: Re: Ipv6 Message-ID: <y7vhetm75t4.wl@condor.jinmei.org> In-Reply-To: <MDELJBBOHGLAJHGDPONDOEDLCDAA.al.feldman@sangoma.com> References: <86zo7h2cz1.wl@keiichi01.osaka.iij.ad.jp> <MDELJBBOHGLAJHGDPONDOEDLCDAA.al.feldman@sangoma.com>
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>>>>> On Fri, 28 Sep 2001 08:59:32 -0400,
>>>>> "Alex Feldman" <al.feldman@sangoma.com> said:
>> Currently the DNS system requires IPv4 transport. If you disable IPv4
>> completely, you cannot resolve any hostnames. In this case, you must
>> set up DNS proxy (ex. totd) from IPv6 to IPv4. Is this your case,
>> isn't it?
A "DNS proxy" like totd is not related to the issue of DNS transport.
Also, "the DNS system requires IPv4 transport" is not necessarily true.
We should say that
- If you rely on a DNS (cache) server that does not support IPv6
transport, you cannot resolve the IP(v6) address from a host name.
In this case, you'll need to turn IPv4 on in your system, or to make
the DNS server support IPv6 transport.
- Even if there is no problem on name resolution, you cannot
communicate with IPv4-only nodes. If you want to do this, you'll
need some translation service from IPv6 to IPv4. Such translation
service may comprise a "DNS proxy" and an actual translation box.
Anyway,
> Not, because I connected two machine back to back.
> Btw, when I set ipv6_forwarding to 1, I was able to ping6.
> But more interesting, when I next time boot this machine (ipv6_forwarding
> set to 0 by default), I was still able to ping6.
> So, what is happened?
Just saying "(not) able to ping6" is not very informative. Be more
specific, please. At least you should tell us
- the OS name (probably FreeBSD) and its version of each node
- (if the node is FreeBSD) the result of
+ ifconfig -a
+ netstat -rn
+ the exact output of the "ping6 execution" (do not describe the
situation, just copy and paste the output)
JINMEI, Tatuya
Communication Platform Lab.
Corporate R&D Center, Toshiba Corp.
jinmei@isl.rdc.toshiba.co.jp
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