RE: Split DNS Questions...
- From: "Jim Harrison" <Jim@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 20 Apr 2005 19:52:15 -0700
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
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