DMZ out OK; inside problems

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• Way PIX515E trust a NT4 on DMZ & Win2k Server inside

  Having a domain controller main running IIS FTP server on DMZ & a Win2K domain in mixed mode AD inside with a PIX 515E 6.1 version 4 with 1 out, 1 inside and 1 DMZ networks. How can I configure my lists for access to FTP for users outside and inside users and first how do I establish a one-way trust so trust PDC users internal, but inside the domain in mixed mode AD do not trust users DMZ PDC.

  Thank you.

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• statics of the DMZ on the inside

  I have a mail relay (gateway) in our DMZ. It stops working if I remove the following static statement:

  static (dmz, upside down) insidemail insidemail netmask 255.255.255.255

  where insidemail is the name of the internal mail server.

  This static doesn't make much sense to me, but as mentioned previously, if it isn't there, I can't get on the mail server internal on port 25.

  BTW, my acl for mail in the demilitarized zone is

  dmz_acl permit tcp host DMZmail host insidemail eq 25 access-list

  Hi binaryflow,

  For any server on the DMZ can access inside server, it must first see the server to an IP address. Only after this accessibility of intellectual property, it will establish communication with that server. The accessibility of intellectual property can be obtained in two ways:

  (1) given the server on his already existing private IP. to do this, without the server natting to the DMZ interface. for this reason, we use the command

  static (dmz, upside down) insidemail insidemail netmask 255.255.255.255

  You can also use these commands:

  NAT (inside) 0 access-list sheep

  access-list allowed sheep ip host insidemail dmz host

  (2) you can also make a static on a few other IP and allow access to this IP address to access list.

  In any case, the server should operate, accessibility of intellectual property is the first criterion. without that it will not work.

  I hope this helps... all the best...

  REDA

• cannot ping in dmz subnet from inside the subnet

  Hey guys

  can someone pls take a look at this config in my 515 and tell me why I can't ping from host 10.2.1.20 (connected inside interface) to host (connected to the dmx interface) 10.3.1.20...

  Thanks ;)

  6.3 (3) version PIX

  interface ethernet0 car

  interface ethernet1 100full

  stop 100full interface ethernet2

  interface ethernet3 100full

  stop 100full interface ethernet4

  interface ethernet5 100full

  ethernet0 nameif outside security0

  nameif ethernet1 inside the security100

  ethernet2 intf2 security2 nameif

  nameif ethernet3 intf3 interieure4

  nameif ethernet4 intf4 securite6

  nameif dmz security50 ethernet5

  enable password xxxx

  passwd xxxx

  hostname MYHOSTNAME

  domain MYDOMAINNAME.local

  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 rsh 514

  fixup protocol rtsp 554

  fixup protocol sip 5060

  fixup protocol sip udp 5060

  fixup protocol 2000 skinny

  fixup protocol smtp 25

  fixup protocol sqlnet 1521

  fixup protocol tftp 69

  names of

  inside_access_in ip access list allow a whole

  pager lines 24

  Outside 1500 MTU

  Within 1500 MTU

  intf2 MTU 1500

  intf3 MTU 1500

  intf4 MTU 1500

  MTU 1500 dmz

  IP address outside 61.29.xxx.xxx 255.255.255.248

  IP address inside 10.2.1.11 255.255.255.0

  No intf2 ip address

  No intf3 ip address

  No intf4 ip address

  10.3.1.11 dmz IP address 255.255.255.0

  alarm action IP verification of information

  alarm action attack IP audit

  no failover

  failover timeout 0:00:00

  failover poll 15

  No IP failover outdoors

  No IP failover inside

  no failover ip address intf2

  no failover ip address intf3

  no failover ip address intf4

  no failover ip address dmz

  history of PDM activate

  ARP timeout 14400

  Global interface 10 (external)

  NAT (inside) 10 0.0.0.0 0.0.0.0 0 0

  NAT (dmz) 10 10.3.1.0 255.255.255.0 0 0

  static (inside, dmz) 10.2.1.0 10.2.1.0 netmask 255.255.255.0 0 0

  inside_access_in access to the interface inside group

  Route outside 0.0.0.0 0.0.0.0 61.29.xxx.xxx 1

  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 10.2.1.0 255.255.255.0 inside

  No snmp server location

  No snmp Server contact

  SNMP-Server Community public

  SNMP-Server enable traps

  enable floodguard

  Telnet timeout 5

  SSH timeout 5

  Console timeout 0

  Terminal width 80

  Thanks again

  Rob

  ICMP is not a stateful Protocol, so you must explicitly allow ICMP traffic on the DMZ interface. Try adding the following:

  access-list dmz_access_in allow icmp a whole

  Access-group dmz_access_in in dmz interface

  I hope this helps.

  Scott

• 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,

  Wayne

  ---------------------------------

  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

  domain p2h.com.sg

  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 203.169.113.110 eq www

  access-list 90 allow the host tcp 10.1.1.27 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 192.168.1.1 255.255.255.0

  dmz 10.1.1.1 IP address 255.255.255.0

  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 202.164.169.42 255.255.255.255 inside

  location of PDM 202.164.169.42 255.255.255.255 dmz

  location of PDM 10.1.1.26 255.255.255.255 dmz

  location of PDM 10.1.1.26 255.255.255.255 outside

  location of PDM 172.16.16.20 255.255.255.255 outside

  location of PDM 192.168.1.222 255.255.255.255 inside

  history of PDM activate

  ARP timeout 14400

  Global 1 interface (outside)

  Global (dmz) 1 10.1.1.101 - 10.1.1.125

  NAT (inside) 1 0.0.0.0 0.0.0.0 0 0

  NAT (dmz) 0-list of access 90

  NAT (dmz) 1 0.0.0.0 0.0.0.0 0 0

  static (dmz, external) 203.169.113.110 10.1.1.27 netmask 255.255.255.255 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 192.168.1.222 255.255.255.255 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) 203.169.113.110 10.1.1.27 netmask 255.255.255.255 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.

• DMZ web server-> inside the database server

  Suppose that a network topology looks like this:

  A PIX with 3 interfaces:

  interface (private public static IP 10.10.10.1)

  interface (public static IP of 69.110.38.35)

  interface (static IP private address of the 30.30.30.1)

  --------------------------------------------

  The internal network has a {server} with the IP address of 10.10.10.2.

  The DMZ has a {web server} with the IP address of 30.30.30.2.

  I will welcome external guests (outside) access to the web server (30.30.30.2) via port 80.

  This web server access turn the database server (10.10.10.2).

  Assume that all other commands are issued. Then, I'll create an access list that allows server WWW DMZ to communicate with inside the database server.

  access-list dmz-to-inside permit tcp host 30.30.30.2 host 10.10.10.2 eq 1521

  Should I publish the following, too:

  (1) access-list dmz permit tcp host 30.30.30.2 no matter what 80 eq

  (2) access-group in interface dmz dmz

  (3) static (inside the dmz) 10.10.10.0 10.10.10.0 netmask 255.255.255.0

  xlate clear 4)

  If so, what each of them do?

  Thank you for helping.

  Scott

  1. Yes, the static statement "10.10.10.0 static (inside, dmz) 10.10.10.0 netmask 255.255.255.0" will disable NAT. Although it is not necessary to disable nat, however, it saves money and simple to manage. the reason for this is the traffic between the dmz and inside is private, there is therefore not necessary to apply the public ip address.

  2 pix receives the package intended to 30.30.30.2 10.10.10.2. PIX examines the static statement and based on the static above statement, pix will not nat package (i.e. pix will leave the soruce address be) and send it to 30.30.30.2 via the interface of the demilitarized zone.

  for example

  original package - source 10.10.10.2, destination 30.30.30.2

  After pix - source 10.10.10.2, destination 30.30.30.2

  3. the "Clear xlate" command must be issued whenever the nat/global or static has been added/deleted/modified. This command is to force the pix to clear the existing ip translation.

  for example, before you add the command "static 1.1.1.1 (indoor, outdoor) 192.168.1.100 netmask 255.255.255.255", the pix may already have an ip 192.168.1.100 translation (it might come from the nat/global). now, after you apply the static command, the pix will keep the existing translation for a certain period time. 'clear xlate' is needed to erase the old translation and so to activate the new static statement.

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