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DNS routing Help???

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DNS routing Help??? - 16.Oct.2002 10:15:00 PM   
LB

 

Posts: 25
Joined: 23.Sep.2002
Status: offline
DNS routing Help!

I implemented ISA (replaced Proxy 2) about 2 weeks ago. I have some strange issues with win95/98 clients not getting to some web sites, but no problem with NT/W2K/XP Pro clients. I believe it to be a routing issues but not sure how to resolve. ANY help would be appreciated.

The network consists NT4 domain, 1-PDC with DHCP/WINS services, and 1 BDC, no DNS servers.

The PDC IP is .1. The DHCP entries have ONLY the following; Domain name, WINS/NBNS server which is .1, and WINS/NBT node type 0x2. I have no default gateway, no router and no name server entry in the DHCP settings.

The ISA server LAN IP is .10. The LAN connection of the ISA has our ISP DNS servers entered. The Wan side is connected to a T1 to our provider.

Should I enter the ISA .10 as the default gateway in DHCP? and or DNS server IP as name server?

OR set up and internal DNS server?

Thnaks,
LB
Post #: 1
RE: DNS routing Help??? - 19.Oct.2002 4:04:00 PM   
spouseele

 

Posts: 12830
Joined: 1.Jun.2001
From: Belgium
Status: offline
Hi LB,

I would recommend to setup an internal DNS server and use your ISP DNS servers as forwarders. If you have a simple internal network (none routed internal network) it is a good idea to put the ISA internal IP address as default gateway in the DHCP parameters. Also, don't forget to setup the internal servers as SecureNAT clients.

HTH,
Stefaan

(in reply to LB)
Post #: 2
RE: DNS routing Help??? - 21.Oct.2002 5:13:00 AM   
LB

 

Posts: 25
Joined: 23.Sep.2002
Status: offline
Thanks for the reply. Yes, I have a flat network, it is a little frustrating as I never had a problem with Proxy 2.0. So I will setup an internal DNS with the ISP Dns as forwards, add the ISA internal ip to the DHCP gateway setting, and add the internal DNS ip (may be the ISA server as well) as DNS enteries to the DHCP as well. sound correct?

Thanks,
LB

(in reply to LB)
Post #: 3
RE: DNS routing Help??? - 21.Oct.2002 9:26:00 PM   
spouseele

 

Posts: 12830
Joined: 1.Jun.2001
From: Belgium
Status: offline
Hi LB,

sounds good!

Correctly configuring the ISA interfaces and a solid DNS infrastructure is a basic requirement if you want a smoothly running ISA server! [Big Grin]

For the interface settings, use the article http://www.isaserver.org/pages/article.asp?id=242 as baseline.

Note that the internal DNS server should have access to the DNS protocols. Therefore, allow the protocols DNS Query (UDP port 53 send/receive) *and* DNS Zone Transfer (TCP port 53 outbound) for the internal DNS server, who must be setup as a SecureNAT client.

HTH,
Stefaan

(in reply to LB)
Post #: 4
RE: DNS routing Help??? - 22.Oct.2002 5:40:00 PM   
Raul E Jimenez

 

Posts: 78
Joined: 21.Oct.2002
From: USA
Status: offline
Hi LB,

For my LAN network I use to have the LAN DNS TCP/IP configurationas as follow:

1 DNS server, The server itself.
2 DNS server the your primary public or ISP DNS server.

DNS queries happen, 1 to the cache on the local machine, 2 To the host file on the local machine, 3 on the Primary and then on the secondary or forward DNS.

This configuration will be additional to the recomendation you got before.

Ra·l JimTnez

(in reply to LB)
Post #: 5
RE: DNS routing Help??? - 23.Oct.2002 11:30:00 PM   
LB

 

Posts: 25
Joined: 23.Sep.2002
Status: offline
Thanks for the great reply and support. I setup the ISA per the article, and setup DNS on the ISA per TomĘs article used as a forwarder to our ISP DNS. I entered our ISA internal IP (192.168.91.10)in DHCP as router (gateway) and DNS server as well.
When I do an nslookup of www.netscape.com I get

****canĘt find server name for address 192.168.91.10 non existent domain
****default servers are not available
Server Unknown
Address: 192.168.91.10

Name; netscape.com
Addresses: 64.12.151.211 and others
Aliases; www.netscape.com

In my dhcp settings I have domain as our NT domain name, should this be our FQDN?

Thanks,
Loren

(in reply to LB)
Post #: 6
RE: DNS routing Help??? - 23.Oct.2002 11:40:00 PM   
LB

 

Posts: 25
Joined: 23.Sep.2002
Status: offline
Thanks for the great reply and support. I setup the ISA per the article, and setup DNS on the ISA per TomĘs article used as a forwarder to our ISP DNS. I entered our ISA internal IP (192.168.91.10)in DHCP as router (gateway) and DNS server as well.
When I do an nslookup of www.netscape.com I get

****canĘt find server name for address 192.168.91.10 non existent domain
****default servers are not available
Server Unknown
Address: 192.168.91.10

Name; netscape.com
Addresses: 64.12.151.211 and others
Aliases; www.netscape.com

In my dhcp settings I have domain as our NT domain name, should this be our FQDN?

Thanks,
Loren

(in reply to LB)
Post #: 7
RE: DNS routing Help??? - 24.Oct.2002 1:01:00 AM   
Raul E Jimenez

 

Posts: 78
Joined: 21.Oct.2002
From: USA
Status: offline
Loren,

For the DNS domain you should use your internal FQDN which is diferent of you NT Domain name. Also if you have a NT network, remember that NT if more focused on netbios resolution. You will take more advantage of your flat network configuration setting up WINS lookup on your DNS zone configuration. [Wink]

I think you netbios node type should be 0x8 and not 0x2 as you post on the first message. [Smile]

That is it, you already have al the rest on the other replays.

Have fun [Smile]

(in reply to LB)
Post #: 8

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