Cannot access the Web server in the DMZ from the inside using IP global

Hi all

I hope it's a very simple question.

I'm running a PIX 515 firewall v6.3. I set up a Web server in my DMZ and use static NAT for re-branded it overall static IP address. Access from the outside of the demilitarized zone works remarkably well. I can access inside the interface Web site using the internal IP, but I can't access it from inside interface using the global IP are entrusted to him.

Is there a particular reason why this would not be allowed? My feeling was that the request would be forwarded via the external interface (as it is a global IP address) and then be bounced back by my sense of the ISP the request would come to the new external interface (as the static NAT is applied to the external interface).

However if I try and access the global IP from my inside interface, then the browser can not find the server.

can someone explain why this is so? Any information would be appreciated.

see you soon,



6.3 (3) version PIX

interface ethernet0 100full

interface ethernet1 100full

interface ethernet2 100full

ethernet0 nameif outside security0

nameif ethernet1 inside the security100

nameif dmz security50 ethernet2

hostname helmsdeep


fixup protocol dns-length maximum 512

fixup protocol ftp 21

fixup protocol h323 h225 1720

fixup protocol h323 ras 1718-1719

fixup protocol http 80

fixup protocol they 389

no correction protocol rsh 514

fixup protocol rtsp 554

fixup protocol sip 5060

fixup protocol sip udp 5060

fixup protocol 2000 skinny

fixup protocol smtp 25

No fixup protocol sqlnet 1521

fixup protocol tftp 69

names of

acl_out list access permit tcp any host eq www

access-list 90 allow the host tcp all

pager lines 24

debug logging in buffered memory

Outside 1500 MTU

Within 1500 MTU

MTU 1500 dmz

IP address outside pppoe setroute

IP address inside

dmz IP address

no failover

failover timeout 0:00:00

failover poll 15

No IP failover outdoors

No IP failover inside

no failover ip address dmz

location of PDM inside

location of PDM dmz

location of PDM dmz

location of PDM outside

location of PDM outside

location of PDM inside

history of PDM activate

ARP timeout 14400

Global 1 interface (outside)

Global (dmz) 1 -

NAT (inside) 1 0 0

NAT (dmz) 0-list of access 90

NAT (dmz) 1 0 0

static (dmz, external) netmask 0 0

Access-group acl_out in interface outside

Timeout xlate 03:00

Timeout conn 01:00 half-closed 0:10:00 udp 0: CPP 02:00 0:10:00 01:00 h225

H323 timeout 0:05:00 mgcp 0: sip from 05:00 0:30:00 sip_media 0:02:00

Timeout, uauth 0:05:00 absolute

GANYMEDE + Protocol Ganymede + AAA-server

RADIUS Protocol RADIUS AAA server

AAA-server local LOCAL Protocol

Enable http server

http inside

enable floodguard

string fragment 1

Console timeout 0

Terminal width 80

Code v6 pix or less don't let you have traffic "back" or return flow via the same interface on which it was sent. Having also your bounce back off of an external server traffic is never a good idea, because you won't be able to distinguish which and rogue attacks by spoofing someone outside your network.

Since you are using pix 6.3 code, you may be able to outside the NAT. Add this static to your config:

static (dmz, upside down) netmask 0 0

You may need to run a clear xlate after adding the new static statement. Note that the interfaces: it's demilitarized zone, inside inside, dmz.

I would like to know if it works.

Tags: Cisco Security

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