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External - Internal NICs at Front-/Backfirewall Config

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External - Internal NICs at Front-/Backfirewall Config - 31.Oct.2008 4:10:24 PM   
tstauffer2

 

Posts: 9
Joined: 29.Oct.2008
Status: offline
Hello - please, who can tell me the recommended allocation of the EXTERNAL and INTERNAL Networks to the NICs in the ISA Firewalls in a Front- / Backfirewall scenario ?

---------LAN1---------Router to internet
   |
   | < external ??
Front-FW
   | < internal ??
   |
   | ----DMZ -----
   |
   | < external network
Back-FW
   | < internal network
   |
---------LAN2---------------.


thanks a lot
Post #: 1
RE: External - Internal NICs at Front-/Backfirewall Config - 31.Dec.2008 9:53:43 AM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
Use private addresses on the DMZ and on the Internal Network.

HTH,
Tom

_____________________________

Thomas W Shinder, M.D.

(in reply to tstauffer2)
Post #: 2
RE: External - Internal NICs at Front-/Backfirewall Config - 1.Apr.2009 8:29:08 AM   
matjaz

 

Posts: 17
Joined: 26.Jan.2005
Status: offline
What about routing?

Do you recommend route or NAT between DMZ and Internal Network. If route does that means that you  publish internal ip's on front ISA server ?

best regards, Matjaz

(in reply to tshinder)
Post #: 3
RE: External - Internal NICs at Front-/Backfirewall Config - 1.Apr.2009 8:56:05 AM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
Depends on the kind of traffic that needs to cross between the DMZ and the Internal Network. If it is all NAT friendly, then definitely use NAT. If not, then use Route.

HTH,
Tom

_____________________________

Thomas W Shinder, M.D.

(in reply to matjaz)
Post #: 4
RE: External - Internal NICs at Front-/Backfirewall Config - 2.Apr.2009 3:55:46 AM   
matjaz

 

Posts: 17
Joined: 26.Jan.2005
Status: offline
well, now we have NAT but we we have problems with Backup client publishing and AD. What bothers me, that if I use routing between NAT and Internal, then I on front ISA I must publish IP from internal Network, So if front ISA isa hacked in some way, the attacker would have information of my internal network. Or I'm missing someting out here ?

Matjaz

(in reply to tshinder)
Post #: 5
RE: External - Internal NICs at Front-/Backfirewall Config - 12.Aug.2009 9:11:40 AM   
matjaz

 

Posts: 17
Joined: 26.Jan.2005
Status: offline
Well, publishing is not working when using route between perimeter and internal on back end firewalls. Am I missing something ?

(in reply to matjaz)
Post #: 6
RE: External - Internal NICs at Front-/Backfirewall Config - 13.Aug.2009 6:21:35 AM   
matjaz

 

Posts: 17
Joined: 26.Jan.2005
Status: offline
Well it's possible to do server publishing, but you'll have to create NAT relationship for that specific server(s).


http://blogs.technet.com/isablog/archive/2008/06/24/server-publishing-with-isa-server-2004-2006-and-route-relationship-between-networks.aspx

(in reply to matjaz)
Post #: 7
RE: External - Internal NICs at Front-/Backfirewall Config - 15.Aug.2009 10:41:36 AM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
You can server publish with a route relationship. Check out my articles on this site on ISA Firewall Networking.

HTH,
Tom

_____________________________

Thomas W Shinder, M.D.

(in reply to matjaz)
Post #: 8

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