Further probing reveals that the MacDNS server is getting a Type 12
(reverse lookup?) query, just before it crashes, for this bizarre
address:
"1.0.0.127.dnsbugtest"
Quite why a 10.4.4 client is sending out such a query using the
localhost name is beyond me. I speculate that someone has inadvertently
left some debugging code in 10.4.4 release, and that this code has
something to do with making Tiger's dns work equally well on bigendian
and littleendian (intel) machines, and somehow my vintage Mac is
receiving dns queries it shouldn't be getting which fry it's little
68030 brain.
Of course, a DNS server, however old, should be immune to malformed
data. Equally, however, I somehow think that a new OS release ought not
to be sending out queries for a host called "1.0.0.127.dnsbugtest".
Something strange here.
GWW
On 19 Jan 2006, at 09:37, Gerald Wilson wrote:
For years on my small network I've used MacDNS on a vintage Mac to
provide a basic private DNS behind NAT. Yes I know it's old and a bit
flaky, but it wasn't broken enough to demand fixing.
Until now. Changing two client machines from Mac OS X 10.4.3 to 10.4.4
has broken MacDNS. It grumbles about malformed enquiries before
crashing with a System Error of Type 2, which I think means a memory
alignment error. I infer that some enquiry that 10.4.4 sends out is
confusing the old MacDNS and causing it to try to process misaligned
data. This seems very odd.
As soon as I can, I'll roll out a BIND daemon on one of my boxes to
take on the DNS job. But it's still a bit disconcerting to find this
apparent mismatch between old and new. I wonder if Tiger 10.4.4 is
genuinely sending out wonky packets, which might cause problems with
other kinds of name service as well?
GWW
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