Date: Tue, 21 Aug 2012 11:57:56 +0900 From: Hajimu UMEMOTO <ume@FreeBSD.ORG> To: Andrey Chernov <ache@FreeBSD.ORG> Cc: svn-src-head@FreeBSD.ORG, svn-src-all@FreeBSD.ORG, src-committers@FreeBSD.ORG, John Baldwin <jhb@FreeBSD.ORG> Subject: Re: svn commit: r239356 - head/sbin/dhclient Message-ID: <ygeharxdk97.wl%ume@mahoroba.org> In-Reply-To: <20120821010311.GA8250@vniz.net> References: <201208171553.q7HFrhuf090457@svn.freebsd.org> <201208171507.07699.jhb@freebsd.org> <20120818195724.GA74684@vniz.net> <201208201409.55544.jhb@freebsd.org> <20120821010311.GA8250@vniz.net>
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Hi,
>>>>> On Tue, 21 Aug 2012 05:03:11 +0400
>>>>> Andrey Chernov <ache@FreeBSD.ORG> said:
ache> Having dual-stack machine it seems proper way for me to run both DHCP and
ache> DHCPv6 clients (net-mgmt/wide-dhcp? net/dhcp6?). But I fear they both will
ache> interact with single /etc/resolv.conf overriding each other there.
FreeBSD 9 and above already have a feature to handle multiple source
of DNS address,; resolvconf(8). Our dhclient(8) and rtsol(8) uses it
to write /etc/resolv.conf.
ache> As I already mention, perhaps it is router bug combined with the lack of
ache> validity checking in dhclient itself. As result I currently have
ache> /etc/resolv.conf:
ache> nameserver 192.168.1.1
ache> nameserver <ipv6 address of the tunnel NS>
Don't you see `# Generated by resolvconf' line in your generated
/etc/resolv.conf?
DHCP cannot carry an IPv6 address.
I suspect your router advertises an IPv6 address of your DNS server.
You can confirm where the DNS server addresss come from by executing
`resolvconf -l'.
The following is the output on my box for example:
ume@yuga:~% resolvconf -l
# resolv.conf from em0:dhcpv6
search mahoroba.org
nameserver 2001:2f0:104:8010::1
nameserver 2001:2f0:104:8010:221:5aff:feeb:183
# resolv.conf from em0:slaac:[fe80::218:71ff:feec:5271]
nameserver 2001:2f0:104:8010::1
search mahoroba.org
# resolv.conf from em0
search mahoroba.org
nameserver 192.168.100.59
nameserver 192.168.100.55
My network announces DHCPv6 and my box is configured to use DHCPv6.
So, there are three sources for a DNS address, here.
Sincerely,
--
Hajimu UMEMOTO
ume@mahoroba.org ume@{,jp.}FreeBSD.org
http://www.mahoroba.org/~ume/
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