ISC Bind as secondary to Windows Server: bad bitmap error on named xfer.

[Tony Finch]

Stoffel, John (TAI) <John.Stoffel at toshiba.com> wrote:
>
> And it does dump some errors too, which hopefully will give me an idea
> of where my crappy bad record is located, and no use hiding crap:

yuck, this looks like no fun...

> www.cisco.toshiba.com.  3600    IN      CNAME   redirect.toshiba.com.
> www.cisco.toshiba.com.  3600    IN      RRSIG   CNAME 8 4 3600 20210517093721 20210507083721 38628 t
> oshiba.com. OEmGkGWSPtbjlCGVt5Ejkgncg2wRcbnfCMSm2By6Fl4gN8R1uXx/ucdN hVrdiiP8BHWTIte/fvoMrMXbMHxarPJ
> C6zJn9HHdC9o2dwBoGpknTwJM DYsy8wA5byhT9f8RVLi0WxLDmncWl2vJcZM6wsKfJ5HWAklGh9YxhOar nCM=
> ;; Got bad packet: bad bitmap
> 16358 bytes

does it print more hexdump? who knows where the problem might be in 16KB
of wire-format DNS...

I would try another DNS AXFR client that might not give up so easily, e.g.
if you have a handy copy of perl and Net::DNS, put your Windows DNS server
IP address into this one-liner instead of 127.0.0.1

perl -MNet::DNS -wE 'my $r = Net::DNS::Resolver->new(); $r->nameservers("127.0.0.1"); for my $rr ($r->axfr("toshiba.com")) { $rr->print }'

The bit of the hexdump you pasted shows another similar CNAME and its
RRSIG, so it isn't very enlightening.

> 46 98 80 00 00 01 00 97 00 00 00 00 07 74 6f 73          F............tos
  header....        RR counts         qname = zone name
> 68 69 62 61 03 63 6f 6d 00 00 fc 00 01 08 63 69          hiba.com......ci
                              00fc = axfr
> 74 69 62 61 6e 6b c0 0c 00 05 00 01 00 00 0e 10          tibank..........
backpointer to zone = c00c 0005 = cname

citibank looks like it follows cisco alphabetically which suggests the
zone transfer might be in canonical order, which could perhaps make it
easier to find the stray NXT / TYPE30 record(s)

> 00 0b 08 72 65 64 69 72 65 63 74 c0 0c c0 1d 00          ...redirect.....
           cname target                  c01d = backpointer to citibank
> 2e 00 01 00 00 0e 10 00 9f 00 05 08 03 00 00 0e          ................
  2e = rrsig   type covered = 0005 (cname)
> 10 60 a2 39 51 60 94 fc 41 96 e4 07 74 6f 73 68          .`.9Q`..A...tosh
> 69 62 61 03 63 6f 6d 00 83 b6 df 32 9f d9 2a 54          iba.com....2..*T
> 65 16 1b 28 09 ac aa b3 41 f0 85 60 e6 e2 18 ae          e..(....A..`....

etc.

Tony.
-- 
f.anthony.n.finch  <dot at dotat.at>  https://dotat.at/
Fisher, German Bight: Variable, becoming mainly west, 2 to 4. Slight
or moderate in Fisher, smooth or slight in German Bight. Showers, fog
patches. Moderate, occasionally very poor.