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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