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7.0

Access Webserver on ASA DMZ from Inside

Asked by spickles1 in Network Software Firewalls, Enterprise Firewalls, Cisco PIX Firewall

I've got an ASA5510 running 8.2(1) with a Webserver in the DMZ.  The webserver can be accessed from outside just fine.  But I cannot access our website from within.  I can ping the private address from inside, but not the public ip.  I can ping the public IP from outside.  I see several posts indicating that a static NAT translation from INSIDE to INSIDE is recommended (i.e. keep the source and destination network the same).  My firewall is in routed mode, so I chose to use a NAT exempt rule instead.  An example would be trying to access my webserver (10.208.11.99 / 24) from a host on another Class A subnet (10.208.13.104 / 24).  I am specifying all subnets on their VLSM, so my NAT exempt is NOT 10.0.0.0 / 8 <--> 10.0.0.0 / 8. 
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name 10.208.11.99 Webserver_Inside description Webserver
name 24.x.x.21 Webserver_Outside description Webserver Public IP
name 24.x.x.17 ASA5510_Outside description ASA5510 Public IP
!
interface Ethernet0/0
 nameif outside
 security-level 0
 ip address ASA5510_Outside 255.255.255.248 
!
interface Ethernet0/1
 nameif inside
 security-level 100
 ip address 192.168.0.10 255.255.255.252 
!
interface Ethernet0/2
 nameif dmz
 security-level 50
 ip address 10.208.11.1 255.255.255.0 
!
interface Ethernet0/3
 shutdown
 nameif management
 security-level 100
 ip address 1.1.1.1 255.255.255.0 
!
interface Management0/0
 shutdown
 no nameif
 no security-level
 no ip address
!
access-list inside_nat0_outbound extended permit ip object-group DM_INLINE_NETWORK_3 host Webserver_Inside 
access-list dmz_nat0_outbound extended permit ip host Webserver_Inside object-group DM_INLINE_NETWORK_4 
global (outside) 1 interface
global (dmz) 2 interface
nat (inside) 0 access-list inside_nat0_outbound
nat (inside) 1 0.0.0.0 0.0.0.0
nat (outside) 1 0.0.0.0 0.0.0.0
nat (dmz) 0 access-list dmz_nat0_outbound outside
static (dmz,outside) Webserver_Outside Webserver_Inside netmask 255.255.255.255 
static (inside,outside) Barracuda_Outside Barracuda_Inside netmask 255.255.255.255 
static (outside,inside) Barracuda_Inside Barracuda_Outside netmask 255.255.255.255 
static (dmz,inside) Webserver_Outside Webserver_Inside netmask 255.255.255.255 
access-group inside_access_in in interface inside
access-group outside_access_in in interface outside
access-group dmz_access_in in interface dmz
!
route outside 0.0.0.0 0.0.0.0 24.x.x.22 1
[+][-]08/19/09 03:46 PM, ID: 25138094Assisted Solution

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[+][-]08/19/09 04:33 PM, ID: 25138295Assisted Solution

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[+][-]08/19/09 06:14 PM, ID: 25138692Author Comment

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[+][-]08/19/09 06:21 PM, ID: 25138727Expert Comment

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[+][-]08/19/09 07:11 PM, ID: 25138916Author Comment

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[+][-]08/19/09 07:17 PM, ID: 25138944Author Comment

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[+][-]08/20/09 09:06 AM, ID: 25144204Author Comment

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[+][-]08/20/09 10:46 AM, ID: 25145222Accepted Solution

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About this solution

Zones: Network Software Firewalls, Enterprise Firewalls, Cisco PIX Firewall
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Solution Provided By: spickles1
Participating Experts: 2
Solution Grade: A
 
 
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