AOL has hard time resolving to us.

Len Conrad LConrad at Go2France.com
Fri Nov 9 17:16:50 UTC 2001



>ehlo sandia.gov
>250-rly-xa04.mx.aol.com peer name unknown
>250 HELP
>Mail From: <macinen at sandia.gov <mailto:macinen at sandia.gov> >
>421 SERVICE NOT AVAILABLE, TEMPORARY DNS FAILURE

look at these DNS delays:

mgw1# dig sandia.gov

; <<>> DiG 8.3 <<>> sandia.gov
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 6, ADDITIONAL: 6
;; QUERY SECTION:
;;      sandia.gov, type = A, class = IN

;; ANSWER SECTION:
sandia.gov.             1H IN A         132.175.109.1

;; AUTHORITY SECTION:
sandia.gov.             1H IN NS        ns1.sandia.gov.
sandia.gov.             1H IN NS        ns2.sandia.gov.
sandia.gov.             1H IN NS        ns3.sandia.gov.
sandia.gov.             1H IN NS        ns4.sandia.gov.
sandia.gov.             1H IN NS        ns5.sandia.gov.
sandia.gov.             1H IN NS        ns0.sandia.gov.

;; ADDITIONAL SECTION:
ns1.sandia.gov.         1H IN A         132.175.1.3
ns2.sandia.gov.         1H IN A         132.175.249.6
ns3.sandia.gov.         1H IN A         134.253.181.25
ns4.sandia.gov.         1H IN A         134.253.16.5
ns5.sandia.gov.         1H IN A         134.253.181.115
ns0.sandia.gov.         1H IN A         132.175.249.1

;; Total query time: 4177 msec
;; FROM: mgw1.meiway.com to SERVER: default -- 212.73.210.69
;; WHEN: Fri Nov  9 18:14:42 2001
;; MSG SIZE  sent: 28  rcvd: 248

mgw1# dig sandia.gov mx

; <<>> DiG 8.3 <<>> sandia.gov mx
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 3, ADDITIONAL: 5
;; QUERY SECTION:
;;      sandia.gov, type = MX, class = IN

;; ANSWER SECTION:
sandia.gov.             1H IN MX        10 mm02snlnto.sandia.gov.
sandia.gov.             1H IN MX        10 mm01snlnto.sandia.gov.

;; AUTHORITY SECTION:
sandia.gov.             1H IN NS        ns0.sandia.gov.
sandia.gov.             1H IN NS        ns1.sandia.gov.
sandia.gov.             1H IN NS        ns2.sandia.gov.

;; ADDITIONAL SECTION:
mm01snlnto.sandia.gov.  1H IN A         132.175.109.20
mm02snlnto.sandia.gov.  1H IN A         132.175.109.21
ns0.sandia.gov.         1H IN A         132.175.249.1
ns1.sandia.gov.         1H IN A         132.175.1.3
ns2.sandia.gov.         1H IN A         132.175.249.6

;; Total query time: 3492 msec
;; FROM: mgw1.meiway.com to SERVER: default -- 212.73.210.69
;; WHEN: Fri Nov  9 18:14:55 2001
;; MSG SIZE  sent: 28  rcvd: 216

... and with 3600 TTL, you're forcing DNS's to hammer through these long 
delays and perhaps timeout.   goto 86400.

Len


http://MenAndMice.com/DNS-training
http://BIND8NT.MEIway.com : ISC BIND 8.2.4 for NT4 & W2K
http://IMGate.MEIway.com  : Build free, hi-perf, anti-abuse mail gateways



More information about the bind-users mailing list