Slow DNS resolution : W2000 + AD + DNS :

[Josep]

Hi EveryBody !!!

I have a question for you, let's see if you can help me.

I friend of mine has got a W2000 Server with a small LAN (6 computers)
connected to a 10/100 Mbps Switch.
All of them are using LAN cards to 100 Mbps.

A ADSL router is connected to the Switch for Internet Access.

A Windows 2000 Server is running Active Directory, DHCP and DNS.
DHCP offers dynamic IP, and information about the Default Gateway and the
main DNS server (the windows 2000 itself).

On the DNS I've 5 entries for DNS forwarding.
The rest of DNS configuration was made automatically by system installation.
I test the basic seeting and I thing all is fine.

In this way, when trying a name resolution, computers on the LAN ask to
W2000 DNS and then, it forwards the query to one of the DNS on the
forwarders list ... OK ?

But I have seen that Internet browsing is slow... mainly the first access to
the WEB site.
It looks like DNS resolution is very slow.

Do you know if I'm missing something on the DNS Server.

Thank you .

 

[Ace Fekay [MVP]]

In

Hi EveryBody !!!

I have a question for you, let's see if you can help me.

I friend of mine has got a W2000 Server with a small LAN (6 computers)
connected to a 10/100 Mbps Switch.
All of them are using LAN cards to 100 Mbps.

A ADSL router is connected to the Switch for Internet Access.

A Windows 2000 Server is running Active Directory, DHCP and DNS.
DHCP offers dynamic IP, and information about the Default Gateway and
the main DNS server (the windows 2000 itself).

On the DNS I've 5 entries for DNS forwarding.
The rest of DNS configuration was made automatically by system
installation. I test the basic seeting and I thing all is fine.

In this way, when trying a name resolution, computers on the LAN ask
to W2000 DNS and then, it forwards the query to one of the DNS on the
forwarders list ... OK ?

But I have seen that Internet browsing is slow... mainly the first
access to the WEB site.
It looks like DNS resolution is very slow.

Do you know if I'm missing something on the DNS Server.

Thank you .

Your config sounds fine. Is there any latency in the ADSL line?

If you do a tracert to say, www.yahoo.com or to www.macromedia.com, how many
hops do you get out of it?

Maybe even try changing the forwarders. BTW- you don't need that many
forwarders, one will work fine, maybe two, the second for fault tolerance.
Maybe even the one you're using first in the list may not be accepting
forwarding requests, but it has to go thru the motions before it goes to the
second one (they're checked one at a time).

Here, try this guy as the first one in your list: 4.2.2.2


--
Regards,
Ace

Please direct all replies to the newsgroup so all can benefit.
This posting is provided "AS-IS" with no warranties and confers no
rights.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory