Re: RIPE DNS Hostcount February 1993
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To: Willi Huber huber@localhost
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From: Marten Terpstra <Marten.Terpstra@localhost
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Date: Mon, 15 Mar 93 10:54:13 +0100
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Cc: noc@localhost (SWITCH noc), RIPE Discussion List ripe-list@localhost
Willi Huber huber@localhost writes:
* Marten wrote:
*
* according to the ch.error file the reason for the lost 3000 host in CH is:
*
* >>>>>>>> No nameservers for epfl.CH responded
*
*
* When looking into this error file I also see a lot of entries like:
*
* !!! extraneous glue record for scsnms.switch.ch within dial-switch.CH
*
* But I can't find the corresponding glue records at all, at least in the
* hostfiles I am responsible for. In fact I recently gave the same advice
* (to remove unnecessary glue records) to a customer of SWITCH, we are
* running a secondary DNS server for. In the transfered zone file there were
* entries like:
*
* $ORIGIN ch.
* isburg IN NS scsnms.switch.ch.
* ; Ignoring info about scsnms.switch.ch, not in zone isburg.ch.
* ; $ORIGIN switch.ch.
* ; scsnms 512565 IN A 130.59.1.30
*
* But I had to learn, that these entries are NOT caused by unnecessary
* glue records, they are just generated for what ever reasons by BIND.
* So are the glue records, the RIPE DNS job detects, also not real? I
* guess so.
When I do a zone transfer for dial-switch.ch I get back something that starts
with:
dial-switch.ch 86400 IN SOA nova.dial-switch.ch
ch-zone-contact.switch.ch (
37 ;serial (version)
28800 ;refresh period
7200 ;retry refresh time
604800 ;expiration period
86400 ;default ttl
)
dial-switch.ch 86400 IN NS nova.dial-switch.ch
nova.dial-switch.ch 86400 IN A 192.86.166.254
dial-switch.ch 86400 IN NS scsnms.switch.ch
scsnms.switch.ch 514618 IN A 130.59.1.30
!!! extraneous glue record for scsnms.switch.ch within dial-switch.ch
You see that the A record for scsnms.switch.ch should not be returned in this
zone. A zone transfer should ONLY return data for that zone. This is a BIND
bug. If however I do the same for nikhef.nl :
nikhef.nl 86400 IN SOA nikhefh.nikhef.nl
hostmaster.nikhef.nl (
930208 ;serial (version)
14400 ;refresh period
3600 ;retry refresh time
604800 ;expiration period
86400 ;default ttl
)
nikhef.nl 86400 IN NS nikhefh.nikhef.nl
nikhefh.nikhef.nl 86400 IN A 192.16.199.1
nikhef.nl 86400 IN NS nikhapo.nikhef.nl
nikhapo.nikhef.nl 86400 IN A 192.16.199.4
nikhapo.nikhef.nl 86400 IN A 192.16.186.42
nikhef.nl 86400 IN NS sering.cwi.nl
nikhef.nl 86400 IN MX 10 nikhefh.nikhef.nl
nikhef.nl 86400 IN MX 20 nikhapo.nikhef.nl
nikhef.nl 86400 IN MX 30 sun4nl.nluug.nl
There could have been records for sun4nl.nluug.nl and sering.cwi.nl but
there are not, because nikhef.nl is using a patched BIND, which will not
return these records. They are not necessarily glue records, but there is no
means to see the difference. Point is that they should not be in the zone
output. I'd suggest you patch your BIND for this.
-Marten
