force others' dns server to return authorative answers
barmar at bbnplanet.com
Tue Mar 7 22:44:24 UTC 2000
In article <8a3m0m$4sm$1 at nnrp1.deja.com>, <aliko at my-deja.com> wrote:
>How do I force them to discard their info from their cache and uses the
>new information from our primary dns server? (I found out the mail
>exchanger in our secondary server for our domain is incorrect but I
>cannot change it because it belongs to our web hosting company and they
>refuse to change it without a charge).
You can't force them to discard anything. Caching name servers retain
information for the length of time specified in the TTL. If you wanted
them to query the authoritative nameservers often, you should have
specified a low TTL in the records that the other servers got.
What you also need to do is get the alternate site to remove the zone from
their nameservers. The problem is that every time a caching server queries
one of the host4u.net servers, it sends back NS records with an updated
TTL, so that resets the TTL on the NS records. As long as those TTLs keep
getting updated, the caching server will never go back to the root servers
to learn the granitecanyon.com NS records.
>incorrect info at Lucent Technology's dns server which they use for
>sending out emails to us. Our mail exchanger should not be
>mail.comneti.com and I don't want them to look up anything from
>host4u.net. What can I do?!
They seem to have the correct info now:
tools:~#1348% dig comneti.com mx @hoextdns.lucent.com
; <<>> DiG 2.2 <<>> comneti.com mx @hoextdns.lucent.com
; (1 server found)
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10
;; flags: qr rd ra; Ques: 1, Ans: 4, Auth: 2, Addit: 4
;; comneti.com, type = MX, class = IN
comneti.com. 38672 MX 20 na-216-214-133-145.corecomm.net.
comneti.com. 38672 MX 30 comnet.xnet.com.
comneti.com. 38672 MX 40 quake.xnet.com.
comneti.com. 38672 MX 10 na-216-214-133-153.corecomm.net.
;; AUTHORITY RECORDS:
comneti.com. 168271 NS NS1.GRANITECANYON.com.
comneti.com. 168271 NS NS2.GRANITECANYON.com.
;; ADDITIONAL RECORDS:
comnet.xnet.com. 81872 A 184.108.40.206
quake.xnet.com. 71988 A 220.127.116.11
NS1.GRANITECANYON.com. 171869 A 18.104.22.168
NS2.GRANITECANYON.com. 171353 A 22.214.171.124
;; Total query time: 17 msec
;; FROM: tools to SERVER: hoextdns.lucent.com 126.96.36.199
;; WHEN: Tue Mar 7 17:42:28 2000
;; MSG SIZE sent: 29 rcvd: 278
Barry Margolin, barmar at bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
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