On Mon, Feb 07, 2011 at 08:14:38PM +0100, Witold Baryluk wrote: > Hello all! > > I found similar problem about CNAME -> AAAA translation first in ping6 > and traceroute6. > > Original report: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=612232 > > Then i disocvered it have much more borader scope > (wget -6, links -6, rsync -6 , ssh -6, traceroute6) > all was erroring with something like: > > # LC_ALL=C wget -6 -nv debian.mirror.cambrium.nl > wget: unable to resolve host address `debian.mirror.cambrium.nl' > # > > What is different from this bug is that when i do > "wget -4" or simply "wget" everything works (but of course over ipv4) > (and similary for all other tools), > > What is interesting I am using maradns, so this can be connected. > > I also added "options inet6" to the resolv.conf, > but effect is the same in all cases (wget without -4/-6 connects over ipv4, > which is a bug anyway as host have IPv6 addres after CNAME resolution). > > I guess it is problem with maradns, becuase after changing resolve.conf to > > nameserver 217.19.16.130 # IP address of ns1.cambrium.nl. > > all tools started to work correctly, becuase server returned everything in > single > response in additional sections: > > # host -r -t ANY debian.mirror.cambrium.nl 217.19.16.130 > Using domain server: > Name: 217.19.16.130 > Address: 217.19.16.130#53 > Aliases: > > debian.mirror.cambrium.nl is an alias for mirror.cambrium.nl. > mirror.cambrium.nl has SOA record ns1.cambrium.nl. > postmaster.mirror.cambrium.nl. 1297082265 16384 2048 1048576 2560 > mirror.cambrium.nl has address 217.19.16.188 > mirror.cambrium.nl has IPv6 address 2a02:58:3:2:80::1 > # > > # fpdns 217.19.16.130 > fingerprint (217.19.16.130, 217.19.16.130): DJ Bernstein TinyDNS 1.05 > # > > > but maradns 1.4.x do not > > # host -t ANY debian.mirror.cambrium.nl MYRESOLVER > debian.mirror.cambrium.nl is an alias for mirror.cambrium.nl. > # > # host debian.mirror.cambrium.nl MYRESOLVER > debian.mirror.cambrium.nl is an alias for mirror.cambrium.nl. > mirror.cambrium.nl has address 217.19.16.188 > mirror.cambrium.nl has IPv6 address 2a02:58:3:2:80::1 > # (the last one is of course because host utility performs recursion by > itself) > > > > With deadwood i see no problem: > > OTHERBOX# host -6 -t ANY debian.mirror.cambrium.nl '::1' > Using domain server: > Name: ::1 > Address: ::1#53 > Aliases: > > debian.mirror.cambrium.nl is an alias for mirror.cambrium.nl. > mirror.cambrium.nl has SOA record ns1.cambrium.nl. > postmaster.mirror.cambrium.nl. 1297082265 16384 2048 1048576 2560 > mirror.cambrium.nl has address 217.19.16.188 > mirror.cambrium.nl has IPv6 address 2a02:58:3:2:80::1 > OTHERBOX# > > OTHERBOX# deadwood -h > Deadwood version 20110116-1 > ... > # > > I tested few others recursive servers arround and also BIND 9.x (9.2-9.6) > looks have to have the same problem. > > > So it is problem/issue, but I do not really know yet if this is bug, > (need to checks specs). > > Question is: shouldn't libc by itself resolve this indirection > (of course limiting it to one level of CNAME indirection)?
The glibc resolver is not a *recursive* resolver, so it's normal it doesn't recurse here. > From behaviour of libc for ipv4 addresses I will safely assume > that indeed libc should perform it, and nacassarly code for ipv6 > CNAME -> AAAA is missing, but apperently (CNAME -> A) is there. I may be wrong, but I don't don't think it handle CNAME for the A case. You are supposed to point your DNS server to a recursive resolver. -- Aurelien Jarno GPG: 1024D/F1BCDB73 [email protected] http://www.aurel32.net -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
