problem with external website

[goofy]

Hi all

I have a win2003 server which is handeling DNS for my internal users.

One of my users has an external website (not on same domain as the internal
domain), but when he does a NSLOOKUP, the internal dns server returns
old/wrong ip number.

If he uses an external DNS to resolve his IP adress, it's correct.

How do i tell my internal DNS to "update" it's cache or aging it's contens.

TIA
Ole

[Brian Desmond [MVP]]

If you goto View>Advanced Features in the DNS console, a "cache" folder will
be available under your DNS servers. You can then right click it and clear
it.

--
--
Brian Desmond
Windows Server MVP
desm...@payton.cps.k12.il.us

Http://www.briandesmond.com

"goofy" <ole.m...@noosspam.omc.dk> wrote in message
news:%23kWC5GI%23DH...@TK2MSFTNGP09.phx.gbl...

[goofy]

Thx for the info.

Is there any way that i can do this on a regular basis (using AT or
something like taht), or do i have to do it by hand ??

/Ole
"Brian Desmond [MVP]" <desm...@payton.cps.k12.il.us> skrev i en meddelelse
news:uDafEfO%23DHA...@TK2MSFTNGP10.phx.gbl...

[Thomas Lee]

In message <uYKKpBS#DHA....@TK2MSFTNGP09.phx.gbl>, goofy
<ole.m...@noosspam.omc.dk> writes

>Thx for the info.
>
>Is there any way that i can do this on a regular basis (using AT or
>something like taht), or do i have to do it by hand ??

You can use dnscmd.exe to do this.

The format would be

dnscmd <server name> /clearcache

You could use the task scheduler to automate this.

Having said this, in most cases, it's probably not such a great idea as
caching does reduce external bandwidth usage. Personally, I find the
need to mess around with cache pretty near zero, unless I'm
reconfiguring a network.

--
Thomas Lee
(t...@psp.co.uk)

[Brian Desmond [MVP]]

Furthermore, the cache should actually clear out stuff on it's own. Every
DNS record and zone as a TTL, or time to live. Once this period of time has
elapsed, the DNS server must remove the record from cache.

--
--
Brian Desmond
Windows Server MVP
desm...@payton.cps.k12.il.us

Http://www.briandesmond.com

"Thomas Lee" <t...@psp.co.uk> wrote in message
news:gGXV0a55...@mail.psp.co.uk...

[Thomas Lee]

In message <#eq4VXd#DHA...@tk2msftngp13.phx.gbl>, "Brian Desmond [MVP]"
<desm...@payton.cps.k12.il.us> writes

>Furthermore, the cache should actually clear out stuff on it's own.
>Every DNS record and zone as a TTL, or time to live. Once this period
>of time has elapsed, the DNS server must remove the record from cache.

True - but I've seen some pretty badly setup serves, with TTLs that are,
shall we say,...

Thomas
--
Thomas Lee
(t...@psp.co.uk)

[Jonathan de Boyne Pollard]

BD> Furthermore, the cache should actually clear out stuff on it's
BD> own. Every DNS record and zone as a TTL, or time to live. Once
BD> this period of time has elapsed, the DNS server must remove the
BD> record from cache.

TL> True - but I've seen some pretty badly setup serves, with
TL> TTLs that are, shall we say,...

If you were about to say "excessively long", then you've forgotten that
Microsoft's DNS server places an upper bound on TTLs (for cached resource
record sets) of one day.

So if Goofy is seeing this resource record set not expiring after more than a
day, then it is not caching that is his problem. (In such a case, my first
educated guess would be that he's done the common thing and set up "split
horizon" DNS service without knowing it.)