Date: Wed, 03 Oct 2001 01:52:04 +0900 (JST) From: Hajimu UMEMOTO <ume@mahoroba.org> To: drosih@rpi.edu Cc: alex@big.endian.de, current@freebsd.org, gad@freebsd.org Subject: Re: lpd: Host name for your address (fe80:....%xl0) unknown Message-ID: <20011003.015204.133265112.ume@mahoroba.org> In-Reply-To: <p05101000b7df93afd4ed@[128.113.24.47]> References: <20010930.234428.102494221.ume@mahoroba.org> <20011001141916.A24281@fump.kawo2.rwth-aachen.de> <p05101000b7df93afd4ed@[128.113.24.47]>
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>>>>> On Tue, 2 Oct 2001 12:30:33 -0400
>>>>> Garance A Drosihn <drosih@rpi.edu> said:
drosih> On the print *client* machine, you start lpd with '-4', meaning that
drosih> it (the client) should only accept jobs from IPv4-style connections.
drosih> Note that this flag only effects what lpd will accept, this flag has
drosih> no effect on what lpr/lpq/lprm will do when they need to connect to
drosih> a remote queue.
Yes, it's right.
drosih> The print queue for 'lp' on oink refers to a remote machine that
drosih> is named neutron. That hostname maps to an IPv6 address. Thus,
drosih> lpq/lpr/lprm have no choice on how to connect to that remote host.
drosih> They use the IPv6 address. (note, for instance, that your 'ping6'
drosih> knows about neutron via IPv6, not IPv4). So, the print client
drosih> connects to the print server via IPv6. When the print client
drosih> connects to the print server, the print server looks up the IPv6
drosih> address of the *client*, because the client made an IPv6 connection
drosih> to the server. Again, this has nothing to do with 'lpd -4' on the
drosih> client. The print server apparently can not find a hostname to
drosih> match the IPv6 address of the client, so it returns the first error
drosih> message, listing the IPv6 address of the client.
No, a client does query AAAA RR for IPv6 and A RR for IPv4. If AAAA
RR is found, a client tries to connect using IPv6, 1st. However, lpd
accepts only IPv4 connection, in this case. Then, if A RR is found, a
client falls down and tries to connect using IPv4. So, a client never
connects using IPv6 to an IPv4 only listening server.
drosih> Assuming that all of the above is correct, then I *think* everything
drosih> is working the way it is supposed to. However, I do not know the
drosih> finer points of how IPv6 is supposed to work. Can a single hostname
drosih> have both an IPv4 address and an IPv6 address? (as far as DNS is
drosih> concerned, I mean). This I do not know. In any case, the parameters
drosih> to 'lpd' are not going to effect how 'lpq' handles the printcap file.
It is usual way that a dual stack host has both AAAA RR and A RR.
--
Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
ume@mahoroba.org ume@bisd.hitachi.co.jp ume@{,jp.}FreeBSD.org
http://www.imasy.org/~ume/
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