RE: Split DNS Questions...
- From: "William Holmes" <wtholmes@xxxxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Thu, 21 Apr 2005 09:46:01 -0400
But But But... I don't have a dog!
-----Original Message-----
From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx]
Sent: Wednesday, April 20, 2005 10:52 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Split DNS Questions...
http://www.ISAserver.org
Can't tell you - I'd have to kill your dog.
-----Original Message-----
From: William Holmes [mailto:wtholmes@xxxxxxxxxxxxxx]
Sent: Wednesday, April 20, 2005 6:37 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Split DNS Questions...
http://www.ISAserver.org
Hello,
Does anyone know if Microsoft has plans to update its DNS to include Support
for split DNS? Bind 9 includes views and it would be really nice if MS added
this capability to their DNS server.
Thanks
-----Original Message-----
From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxx]
Sent: Wednesday, April 20, 2005 9:25 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Split DNS Questions...
http://www.ISAserver.org
Hi Dan,
You said the magic words, Split DNS.
Responses inline...
Tom
www.isaserver.org/shinder
Tom and Deb Shinder's Configuring ISA Server 2004
http://tinyurl.com/3xqb7
MVP -- ISA Firewalls
-----Original Message-----
From: Ball, Dan [mailto:DBall@xxxxxxxxxxx]
Sent: Wednesday, April 20, 2005 8:09 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] Split DNS Questions...
http://www.ISAserver.org
I haven't really looked into using a Split DNS before because what we had was
working "okay". However, I'm running into a few issues that make me wonder
if a split DNS would be appropriate for our situation.
- We do use the same domain name for the internal network, as is publicly
available. Sounds like a perfect situation for a split DNS...
TOM: You bet! I do this whenever I can. Never had a problem except for VPN
clients at times, related to the RAS adapter not moving to the top once
connected. I'll do an article on this that includes the fix -- if you run
into the issue, I'll send the fix via e-mail.
- Accessing our own website acts like it's coming from the outside. The ISA
logs show it coming in and going out of the internal network, but passing
right by the web publishing policy, and hitting my last policy for IntraNet
All Protocols. I don't mind it passing through the ISA server, as it doesn't
put much of a load on it and I can then see it in the reports. However, I'd
like to be able to have it recognize the local connection, and provide
authentication.
TOM: Shouldn't be that way. You internal sites should all be configured for
Direct Access, so that Firewall clients and Web proxy clients ignore their
roles and allow direct communication with the internal hosts.
Looping back through the ISA firewall for local resources is one of the venal
sins of ISA firewall networking.
- Since installing Rain Connect, we've been having troubles with some
outgoing e-mails. Apparently, one of our IP addresses doesn't have a reverse
DNS entry for it, and many organizations won't accept it if they can't do a
reverse lookup. So I redirected all TCP port 25 traffic through one of our
ISPs. However, whenever that link goes down (and cable modems go down at
least once an hour), it redirects the traffic through the other port, and we
get some rejected messages. Trying to clear this up with our ISP doesn't
seem to be working, so maybe running our own (split) DNS server would clear
it up?
TOM: I assume that you're ISP owns your netblock and not you (might not be
so, but almost always is). In that case, you need the ISP to add the reverse
lookup zone record for you. On their DNS server, since they are authoritative
for their netblock, even if they "let" you use some of their addresses. Note
that's true only for reverse lookups, as you maintain the authorative forward
lookup zones on your DNS agent on the RainConnect software.
- Along with the last one comment, we plan on adding a few more ISPs in the
future, and removing others. I personally think it would be much easier to
do these updates if we ran our own (public) DNS server, instead of the hassle
of trying to get all ISPs to change entries all the time.
TOM: If RainConnect still works the way it used to, it's the authoritative
forward lookup zone DNS server, so you're hosting the forward lookup zone
records already and the RainConnect DNS agent takes care of things for you. I
have to admit, I don't know how they handle MX records these days, but the MX
records always map to A records, and RainConnect handles those automatically
for ISP failover. I don't think you want to load balance the SMTP traffic,
since you need the reverse lookups to work correctly. Just make sure you get
the reverse lookup zone records in place on all ISPs that you use for your
RainConnect setup.
So what do you think? Good scenario for a Split DNS?
TOM: GREAT setup for a split DNS. Your users will love it. Just let me know
if you're going to use it for incoming VPN and I'll send you some fixes.
HTH,
Tom
------------------------------------------------------
List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist
ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp
ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ
------------------------------------------------------
Other Internet Software Marketing Sites:
World of Windows Networking: http://www.windowsnetworking.com Leading Network
Software Directory: http://www.serverfiles.com
No.1 Exchange Server Resource Site: http://www.msexchange.org Windows
Security Resource Site: http://www.windowsecurity.com/ Network Security
Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions:
http://www.ntfaxfaq.com
------------------------------------------------------
You are currently subscribed to this ISAserver.org Discussion List as:
tshinder@xxxxxxxxxxxxxxxxxx
To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=isalist
Report abuse to listadmin@xxxxxxxxxxxxx
------------------------------------------------------
List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist
ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp
ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ
------------------------------------------------------
Other Internet Software Marketing Sites:
World of Windows Networking: http://www.windowsnetworking.com Leading Network
Software Directory: http://www.serverfiles.com
No.1 Exchange Server Resource Site: http://www.msexchange.org Windows
Security Resource Site: http://www.windowsecurity.com/ Network Security
Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions:
http://www.ntfaxfaq.com
------------------------------------------------------
You are currently subscribed to this ISAserver.org Discussion List as:
wtholmes@xxxxxxxxxxxxxx
To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=isalist
Report abuse to listadmin@xxxxxxxxxxxxx
------------------------------------------------------
List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist
ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp
ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ
------------------------------------------------------
Other Internet Software Marketing Sites:
World of Windows Networking: http://www.windowsnetworking.com Leading Network
Software Directory: http://www.serverfiles.com
No.1 Exchange Server Resource Site: http://www.msexchange.org Windows
Security Resource Site: http://www.windowsecurity.com/ Network Security
Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions:
http://www.ntfaxfaq.com
------------------------------------------------------
You are currently subscribed to this ISAserver.org Discussion List as:
jim@xxxxxxxxxxxx
To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=isalist
Report abuse to listadmin@xxxxxxxxxxxxx
All mail to and from this domain is GFI-scanned.
------------------------------------------------------
List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist
ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp
ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ
------------------------------------------------------
Other Internet Software Marketing Sites:
World of Windows Networking: http://www.windowsnetworking.com Leading Network
Software Directory: http://www.serverfiles.com
No.1 Exchange Server Resource Site: http://www.msexchange.org Windows
Security Resource Site: http://www.windowsecurity.com/ Network Security
Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions:
http://www.ntfaxfaq.com
------------------------------------------------------
You are currently subscribed to this ISAserver.org Discussion List as:
wtholmes@xxxxxxxxxxxxxx To unsubscribe visit
http://www.webelists.com/cgi/lyris.pl?enter=isalist
Report abuse to listadmin@xxxxxxxxxxxxx
Other related posts:
