The trailing period is quite legal and indicates that this is a fully
qualified domain name and no local domains should be appended when trying to
resolve the name.
If the trailing period is not present the DNS resolver will append local
domain names before resolving the name.
See the example below:
>xmailserver.org
Server: dns1.telcomresearch.com
Address: 209.121.70.5
------------
Got answer:
HEADER:
opcode = QUERY, id = 6, rcode = NXDOMAIN
header flags: response, auth. answer, want recursion, recursion
avail.
questions = 1, answers = 0, authority records = 1, additional = 0
QUESTIONS:
xmailserver.org.telcomresearch.com, type = A, class = IN
AUTHORITY RECORDS:
-> telcomresearch.com
ttl = 90000 (1 day 1 hour)
primary name server = telcom-1.telcomresearch.com
responsible mail addr = dnsadmin.telcomresearch.com
serial = 11150
refresh = 900 (15 mins)
retry = 600 (10 mins)
expire = 172800 (2 days)
default TTL = 90000 (1 day 1 hour)
------------
------------
Got answer:
HEADER:
opcode = QUERY, id = 7, rcode = NOERROR
header flags: response, auth. answer, recursion avail.
questions = 1, answers = 1, authority records = 2, additional = 2
QUESTIONS:
xmailserver.org , type = A, class = IN
ANSWERS:
-> xmailserver.org
internet address = 69.30.125.51
ttl = 86400 (1 day)
AUTHORITY RECORDS:
-> xmailserver.org
nameserver = x35.xmailserver.org
ttl = 86400 (1 day)
-> xmailserver.org
nameserver = mail.xmailserver.org
ttl = 86400 (1 day)
ADDITIONAL RECORDS:
-> x35.xmailserver.org
internet address = 69.30.125.51
ttl = 86400 (1 day)
-> mail.xmailserver.org
internet address = 69.30.125.52
ttl = 86400 (1 day)
------------
Name: xmailserver.org
Address: 69.30.125.51
At 12:05 PM 02/06/2005, you wrote:
I'm finding that quite a few files in the dnscache are terminated with a
period.
An example is "panda.co.jp."
This seems to be a real non-no in windows. My backup utilities choke on this
and I can't even delete it from windows explorer. I can't even rename it.
I find the only way I can get rid of it is to go to that directory and use
>del *.*
I looked at these guys MX record and offhand I don't see anything wrong.
This bust be kind of attempt at getting around address filters. I did have
"*.jp" in spam-address.tab and should have blocked that address anyway. I
changed it to "*.jp." and hopefully this will take care of it. I have run
into it in the past but very isolated and can't remember if it is only a MX
from Japan or not.
Has anyone else run into this and might there be a better way of blocking
this type of thing?
Rich...
www.autotraker.com[1]
AutoTraker Inc.
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Telcom Research WEB: http://www.TelcomResearch.com
[2]Voice 1 (905) 336-2450 Fax 1 (905) 336-1487
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2 http://www.telcomresearch.com/
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