Problem after migrating DNS

[Ramesh v]

Hi,
Recently we migrated our DNS to windows 2003,which is DHCP server and domain controller from windows 2000 server .Everything went fine,but problem started with internet connectivity after two days.Now we have to restart our hardware firewall very frequently.Does the hardware firewall require WINS also to be installed.Previously we had WINS which we uninstalled.

 

[DelJo63]

>>Does the hardware firewall require WINS?

Never. This is a service for Windows only. Just consider that your
hardware firewall will service ALL networked systems, Unix, Linux, and even Macs
where WINs doesn't exist.

Besides the migration, did you add any more clients or might there be more
services running on the new Domain Controller system? Verify your traffic
load and filter out anything not necessary. Are your users streaming video or
music?

edit: you can use PRTG to evaluate protocols and network usage by IP

 

[Nodsu]

Upgrade from 2000 to 2003 should be pretty seamless..

Maybe look over how your DNS is set up. Now that WINS is gone, your DNS may be flooded with name queries that may be hitting your firewall too.

The firewall should be configured to drop all traffic that is destined to itself except for the management protocols of course

 

[Ramesh v]

PRTG report

Thanks for the replies,
DNS looks pretty normal.Host records are not too much.When the net is down PRTG report says WAN1 Nill usage and WAN2 fulll usage. We have two leased line connection which is distributed in WAn1 and WAN2.Its quite confusing,Is it something to do with DHCP because some entries are repeated in DHCP address leases.Now the frequency of net down time has increased.
Question: Firewall or Server or traffic congestion??????.
Help please ////////

 

[Nodsu]

Can you do some sort of a packet dump on the firewall to see what traffic is hitting the "full usage" port? It might as well be a Windows workstation infected by a virus.

 

[Ramesh v]

Virus scan completed

Virus scan is completely done in the network.Now the frequency is less.But it happens once in two or three days now.

 

[Ramesh v]

pointer records

Thanks everyone,
It was the problem with reverse lookup pointer records.
Just added pointer records of the new DNS server manually.
Now the network is normal.