CNAME TTL

[James Raftery]

On Thu, Mar 22, 2001 at 03:40:06PM +0100, Vincent DUQUESNE wrote:
> Does a DNS server send, in its answer, the TTL of the CNAME record or the
> TTL of the A record corresponding ?

The CNAME has a TTL. The A has a TTL. They are not interchangeable. 
They do not merge into each other. They are seperate and distinct 
records. They mean different things.

Each will be returned in a response with its own TTL specified. For
example:

; <<>> DiG 8.3 <<>> @ns1.ucd.ie www.iedr.net a 
; (1 server found)
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 6, ADDITIONAL: 6
;; QUERY SECTION:
;;	www.iedr.net, type = A, class = IN

;; ANSWER SECTION:
www.iedr.net.		1d23h59m48s IN CNAME  redirect.domainregistry.ie.
redirect.domainregistry.ie.  20h47m18s IN A  193.1.142.29

[rest of response snipped]


james
-- 
James Raftery (JBR54)
  "It's somewhere in the Red Hat district"  --  A network engineer's
   freudian slip when talking about Amsterdam's nightlife at RIPE 38.