Re: DNS Subnet question with DMZ
- From: "Jim Harrison" <jim@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Fri, 10 Aug 2001 10:53:07 -0700
There is always a choice. If you choose to place E2K in the DMZ, then you
also choose to open the DMZ to the LAT for AD communications. It's all
about choices and the risks. you're willing to accept.
Jim Harrison
MCP(2K), A+, Network+, PCG
----- Original Message -----
From: "Jay" <jschwarzkopf@xxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Friday, August 10, 2001 10:05
Subject: [isalist] Re: DNS Subnet question with DMZ
http://www.ISAserver.org
Of course, with E2k you have no choice.
----- Original Message -----
From: "Jim Harrison" <jim@xxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Friday, August 10, 2001 12:03 PM
Subject: [isalist] Re: DNS Subnet question with DMZ
> http://www.ISAserver.org
>
>
> That server would provide an open path to the LAT through the VPN
> connection.
> All deployment is based on risk assessment. Only you can determine if the
> dangers of a given setup are outweighed by the benefits. Generally, only
> those protocols that need to pass between DMZ and LAT should be allowed.
> Allowing AD traffic to the DMZ is dangerous, regardless of how you allow
it.
>
> Jim Harrison
> MCP(2K), A+, Network+, PCG
>
> ----- Original Message -----
> From: "Jay" <jschwarzkopf@xxxxxxxxxx>
> To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
> Sent: Friday, August 10, 2001 7:49 AM
> Subject: [isalist] Re: DNS Subnet question with DMZ
>
>
> http://www.ISAserver.org
>
>
> Okay.
>
> What about server in perimeter network of back-to-back (using different
> firewalls), with VPN connection into internal ISA firewall? Is that
anymore
> a security concern than published ports?
>
>
> ----- Original Message -----
> From: Jim Harrison
> To: [ISAserver.org Discussion List]
> Sent: Friday, August 10, 2001 10:27 AM
> Subject: [isalist] Re: DNS Subnet question with DMZ
>
>
> http://www.ISAserver.org
>
>
> A DMZ provides isolation of your trusted network from your
> "publicly-available" servers" Some like to think of the DMZ as the
> "sacrificial lamb", and to a degree it is. The general idea is that if
> someone wants to trash something, let it be in the DMZ. By the same
token,
> if someone were to trash your DMZ server, they still don't have direct
> access to the trusted LAN.
>
> Jim Harrison
> MCP(2K), A+, Network+, PCG
>
> ----- Original Message -----
> From: Jay
> To: [ISAserver.org Discussion List]
> Sent: Friday, August 10, 2001 7:18 AM
> Subject: [isalist] Re: DNS Subnet question with DMZ
>
>
> http://www.ISAserver.org
>
>
> Is there a benefit of putting E2k (or any server) on DMZ, over just
> publishing it from internal net?
>
>
>
> ----- Original Message -----
> From: Jim Harrison
> To: [ISAserver.org Discussion List]
> Sent: Friday, August 10, 2001 9:38 AM
> Subject: [isalist] Re: DNS Subnet question with DMZ
>
>
> http://www.ISAserver.org
>
>
> Unfortunately, the best you can do for the DMZ server is a single IP
> with the set you're given.
> Since the DMZ in a three--homed ISA is a subnet of the external
> subnet, you have to use a /30 mask for the DMZ, giving you only 2 usable
> IPs; one for the ISA DMZ NIC and one left for a server.
> Is the Exchange server an E2K variation? If so, placing it in the
DMZ
> is more trouble than it's worth, given the issues related to AD membership
> across a firewall.
>
> Jim Harrison
> MCP(2K), A+, Network+, PCG
>
> ----- Original Message -----
> From: cismic
> To: [ISAserver.org Discussion List]
> Sent: Thursday, August 09, 2001 9:51 PM
> Subject: [isalist] DNS Subnet question with DMZ
>
>
> http://www.ISAserver.org
>
>
> I also posted this to the message boards. Sorry for the
duplication.
> Just thought I'd see if anyone was online tonight with some ideas.
>
> J
>
>
>
> Hello,
>
>
>
> I'm using 10.0.0.1 for illustration:
>
>
>
> I have 10.0.0.1/29 (8 IPs, 32 per C)
>
> as my ip address. IP'S .1 and .8 are being used by my ISP. .7 is
> assigned to my CISCO 776M ISDN router.
>
>
>
> That leaves me with 5 ip address to use.
>
> .2, .3, .4, .5, .6
>
> EXT NIC 1. = .2
>
> DMZ NIC 1. = .3
>
> DMZ servers would be .4, .5, .6
>
>
>
> If I split those into something like the following
>
> .4 sql
>
> .5 web
>
> .6 DNS
>
> I run out of address and won't be able to place my exchange server
> in the dmz.
>
>
>
> and Internal NIC private could be 10.0.1.0
>
>
>
> Is there another method that will work just as well so I can
publish
> my Exchange server?
>
>
>
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