How long does DNS server cache an entry
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 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: How long does DNS server cache an entry
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... _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: How long does DNS server cache an entry
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 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]