Re: How long does DNS server cache an entry

[J Roysdon]

Depends on how long the SOA says to cache it.  RFCs state that only a
minimum of 2 days has to be supports (so even if someone sets 1 hour, many
DNS admins won't honor it).

C:\nslookup -q=soa artoo.net
Server:  c3p0.internal.artoo.net
Address:  192.168.45.14

artoo.net
primary name server = r2.artoo.net
responsible mail addr = jroysdon.artoo.net
serial  = 2001022603
refresh = 3600 (1 hour)
retry   = 900 (15 mins)
expire  = 43200 (12 hours)
default TTL = 86400 (1 day)

Hmm, I need to bump that back up to a week.  We changed IPs a bit ago and I
had it decreased to facilitate the cutover.

--
Jason Roysdon, CCNP+Security/CCDP, MCSE, CNA, Network+, A+
List email: [EMAIL PROTECTED]
Homepage: http://jason.artoo.net/
Cisco resources: http://r2cisco.artoo.net/


""Ruihai An"" [EMAIL PROTECTED] wrote in message
9afgfs$s4e$[EMAIL PROTECTED]">news:9afgfs$s4e$[EMAIL PROTECTED]...
 This question is not related to Cisco, but I am sure some Cisco engineer
 know the anwer

 How long does DNS server cache an entry it resoved earlier ?
 Thanks
 Ruihai
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Re: How long does DNS server cache an entry

[Drew Simonis]

Ruihai An wrote:
 
 This question is not related to Cisco, but I am sure some Cisco engineer
 know the anwer

Wow.  Now here's a strict criteria for posting messages!  Hey, I bet
someone here can fix cars too.  

 
 How long does DNS server cache an entry it resoved earlier ?

The RFC for DNS, as well as any search engine (google too complex?)
would have explaind this much quicker than a post to a mailing list
dedicated to study for Cisco certifications...

Since I'm bothering to make this post, further wasting bandwith, 
I might as well save you the search.  Each DNS record has a TTL,
which is used to specify how long that entry may be cached.  So,
long story short, its up to the owner of that domain as to how 
long it can be saved.

Now back to cars...
_
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