Pix 501 problem

Similar Questions

• Pix 501 problem, I can not receive smtp messages

  Currently, I can send messages but cannot receive the mail from the Internet, if I remove the Pix and connect directly to the Modem/router then I can SMTP on port 25 and SMTP mail works fine both in & out.

  All what we want this Pix to allow at present is:

  (a) access to Internet to all clients on the network internal

  (b) allow the customers to pop mail web e-mail accounts

  (c) we want to use Exchange & Outlook and accommodate our own email via the SMTP Protocol

  Please find attached two documents: -.

  1. a current edited config of my Pix 501 running

  2. a PowerPoint of my network diagram.

  I appreciate a lot of help.

  Vinny.

  I finally found the problem.

  On the ADSL router, you have configured the same 192.168.0.0/24 network you use behind the post office

  Server. This configuration will not work because it leads to a duplicate IP address range and you have routing

  problems.

  Change the configuration to another range of IP between the ADSL router and PIX firewall and everthing will be

  work.

  Note the address unique public IP that is configured, received is on the router Netgear ADSL uses all other interfaces

  public IP addresses.

  Recovery of the networks and the IPs:

  80.x.y.z/255.255.255.x = Netgear outside intellectual property

  192.168.2.0/255.255.255.0 = network between the internal Netgear and the PIX outside interface

  192.168.1.0/255.255.255.0 = network between the PIX inside and the external interface of the mail server

  192.168.0.0/255.255.255.0 = network between the internal interface of mail server and mail clients.

  Use 192.168.2.0 255.255.255.0 for this network, and then set it 192.168.2.1 for your ADSL router inside

  interface, use a static IP 192.168.2.2 255.255.255.0 on the PIX firewall outside interface.

  ADSL installation:

  You can choose on the Netgear between all public traffic of the 80.x.y.z IP to 192.168.2.2 transmission which is NAT or

  You can transfer to forward the http, pop3 and smtp, didn't really matter, it's just important that you NAT or PAT it

  for the PIX firewall.

  PIX installation example:

  All traffic received on the PIX outside interface for http, pop3 and smtp is then transmitted by 192.168.2.2 to mail

  the server 192.168.1.2 external IP address.

  outdoor IP 192.168.2.2 address 255.255.255.0

  IP address inside 192.168.1.1 255.255.255.0

  acl_out list access permit tcp any host 192.168.2.2 eq http

  acl_out list access permit tcp any host 192.168.2.2 pop eq

  acl_out list access permit tcp any host 192.168.2.2 eq smtp

  Access-group acl_out in interface outside

  static (inside, outside) tcp 192.168.2.2 80 192.168.1.2 80 netmask 255.255.255.255 0 0

  static (inside, outside) tcp 192.168.2.2 110 192.168.1.2 110 netmask 255.255.255.255 0 0

  static (inside, outside) tcp 192.168.2.2 25 192.168.1.2 25 netmask 255.255.255.255 0 0

  Global 1 interface (outside)

  NAT (inside) 1 0.0.0.0 0.0.0.0

  Route outside 0.0.0.0 0.0.0.0 192.168.2.1

  Installation of mail server:

  The mail server has a default route to the PIX firewall.

  Default gateway on the mail server = 192.168.1.1

  Do you have NAt or PAT on the mail server internal clients to the Internet in the direction of the PIX? If not, you need to add another road on the PIX, so know the PIX the 192.168.0.0/24 network is behind the e-mail server, as this unit is the routing for this network.

  Add a route on the PIX inside interface:

  Route inside 192.168.0.0 255.255.255.0 192.168.1.2

  E-mail clients:

  All mail clients have the internal IP address of mail as default gateway server.

  Default gateway = 192.168.0.3

  This configuration will work 100%

  Sorry if I you confused.

  sincerely

  Patrick

• PIX 501 problems with the web server internal.

  I want to open for my internal Web server, so it can be accessed from outside and I read about it here and how to do it and I do what I think of his right, but I can´t operate.

  Now I just tried to open the http port standard 80 but later I want to open a specific port and also use SSL on the web server for added security.

  Then I would like my setup now get help and also how to do when using other ports and SSL later.

  Thanks Thomas!

  6.3 (1) version PIX

  interface ethernet0 10baset

  interface ethernet1 100full

  ethernet0 nameif outside security0

  nameif ethernet1 inside the security100

  alfta hostname

  domain ciscopix.com

  names of

  name 192.168.1.16 TerminalPC

  name 192.168.3.0 Lager

  permit 192.168.1.0 ip access list inside_nat0_outbound 255.255.255.0 192.168.2.0 255.255.255.0

  permit 192.168.1.0 ip access list inside_nat0_outbound 255.255.255.0 255.255.255.0 Lager

  permit 192.168.1.0 ip access list outside_cryptomap_20 255.255.255.0 192.168.2.0 255.255.255.0

  permit 192.168.1.0 ip access list outside_cryptomap_40 255.255.255.0 255.255.255.0 Lager

  outside_cryptomap_60 ip access list allow

  192.168.1.0 255.255.255.0 192.168.2.0 255.255.255.0

  outside_access_in tcp allowed access list all eq www

  host 62.108.197.90 eq www

  IP outdoor 62.108.197.90 255.255.255.192

  IP address inside 192.168.1.254 255.255.255.0

  alarm action IP verification of information

  alarm action attack IP audit

  location of PDM 62.108.197.10 255.255.255.255 outside

  location of PDM 62.108.197.11 255.255.255.255 outside

  location of PDM 192.168.1.0 255.255.255.255 inside

  location of PDM TerminalPC 255.255.255.255 inside

  location of PDM 192.168.2.0 255.255.255.0 outside

  location of PDM Lager 255.255.255.0 outside

  location of PDM 192.168.2.0 255.255.255.0 inside

  location of PDM 62.108.197.137 255.255.255.255 outside

  location of PDM 62.108.197.137 255.255.255.255 inside

  location of PDM 195.67.210.72 255.255.255.255 outside

  location of PDM 62.108.197.90 255.255.255.255 inside

  PDM logging 100 information

  Global 1 interface (outside)

  NAT (inside) 0-list of access inside_nat0_outbound

  NAT (inside) 1 0.0.0.0 0.0.0.0 0 0

  static (inside, outside) tcp 62.108.197.90 www TerminalPC www netmask 255.255.255.255 0 0

  Access-group outside_access_in in interface outside

  Route outside 0.0.0.0 0.0.0.0 62.108.197.65 1

  Enable http server

  http 62.108.197.10 255.255.255.255 outside

  http 62.108.197.11 255.255.255.255 outside

  http 195.67.210.72 255.255.255.255 outside

  http 192.168.1.0 255.255.255.0 inside

  http 62.108.197.137 255.255.255.255 inside

  enable floodguard

  Permitted connection ipsec sysopt

  Crypto ipsec transform-set ESP-DES-MD5 esp - esp-md5-hmac

  Crypto ipsec transform-set esp strong - esp-sha-hmac

  outside_map 20 ipsec-isakmp crypto map

  card crypto outside_map 20 match address outside_cryptomap_20

  peer set card crypto outside_map 20 195.198.46.88

  outside_map card crypto 20 the transform-set ESP-DES-MD5 value

  outside_map 40 ipsec-isakmp crypto map

  card crypto outside_map 40 correspondence address outside_cryptomap_40

  peer set card crypto outside_map 40 62.108.197.137

  outside_map card crypto 40 the transform-set ESP-DES-MD5 value

  outside_map 60 ipsec-isakmp crypto map

  card crypto outside_map 60 match address outside_cryptomap_60

  peer set card crypto outside_map 60 195.198.46.88

  card crypto outside_map 60 the transform-set ESP-DES-MD5 value

  outside_map interface card crypto outside

  ISAKMP allows outside

  ISAKMP key * address 62.108.197.137 netmask 255.255.255.255

  ISAKMP key * address 195.198.46.88 netmask 255.255.255.255

  part of pre authentication ISAKMP policy 10

  encryption of ISAKMP policy 10

  ISAKMP policy 10 sha hash

  10 1 ISAKMP policy group

  ISAKMP life duration strategy 10 86400

  part of pre authentication ISAKMP policy 20

  encryption of ISAKMP policy 20

  ISAKMP policy 20 md5 hash

  20 2 ISAKMP policy group

  ISAKMP duration strategy of life 20 86400

  Telnet 192.168.1.0 255.255.255.255 inside

  Get out your ACL - access-list outside_access_in permit tcp any host 62.108.197.90 eq www

  And a new application:

  outside_access_in list access permit tcp any host 62.108.197.90 eq www

  Access-group outside_access_in in interface outside

  * You have the group-access above on your original configuration message, BUT not on the above post.

  Don't forget to issue clear xlate after the change and also record with write mem.

  Try to do this in the pix CLI instead of using PDM.

  Hope this helps and let me know how you go.

  Jay

• Pix 501 connection problems

  I am very new to cisco equipment and I was wondering if someone could help me with this (probably very simple question).

  When connecting to my pix via the browser (https://192.168.1.1/startup.html), the browser never took the start screen with the message that says "loading, please wait." This leads me to believe that the firewall is rejecting connections from my machine (which uses dhcp to get an ip address of the pix).

  To work around this problem, I tried to connect to the CLI using hyperterminal. I can connect and run a few basic commands as 'show version', but cannot log on as a user with permissions.

  If the web interface has a default connection of void & empty, surely the cli should be the same?

  Is anyone able to tell me what is the default login, so that I can start confguring the pix via the cli?

  Thanks in advance.

  Justin Spencer.

  Please see below for info pix:

  Cisco PIX Firewall Version 6.3 (3)

  Cisco PIX Device Manager Version 3.0 (1)

  Updated Thursday, August 13 03 13:55 by Manu

  pixfirewall until 12 minutes 18 seconds

  Material: PIX - 501, 16 MB RAM, 133 MHz Am5x86 CPU

  Flash E28F640J3 @ 0 x 3000000, 8 MB

  BIOS Flash E28F640J3 @ 0xfffd8000, 128KB

  0: ethernet0: the address is 0011.937e.0486, irq 9

  1: ethernet1: the address is 0011.937e.0487, irq 10

  Features licensed:

  Failover: disabled

  VPN - A: enabled

  VPN-3DES-AES: enabled

  The maximum physical Interfaces: 2

  Maximum Interfaces: 2

  Cut - through Proxy: enabled

  Guardians: enabled

  URL filtering: enabled

  Internal guests: 10

  Throughput: unlimited

  Peer IKE: 10

  This PIX has a restricted license (R).

  Serial number: 808301473 (0x302db3a1)

  Activation key running: 0xb53be54d 0x26da18f9 0xb2b78cef 0x8fe1abb6

  Configuration changed from enable_1 to 15:36:42.554 UTC, Monday, November 8, 2004

  pixfirewall >

  long live java.

  Please this mark as resolved, others won't waste time.

  Thank you

• Problems with PIX 501 and Server MS Cert

  Hi all

  I have two problems with my PIX 501:

  1. registration works well. The pix has a certificate and use it with SSL and VPN connections. But after a refill, the pix certificate is lost and it has regenerated again self-signed certificate!

  Yes, I wrote mem and ca records all!

  2. at the request of ca CRL , I get the following debugging:

  Crypto CA thread wakes!

  CRYPTO_PKI: Cannot be named County ava

  CRYPTO_PKI: transaction GetCRL completed

  Crypto CA thread sleeps!

  CI thread wakes!

  And the CRL is empty.

  Does anyone have any idea?

  Bert Koelewijn

  Not sure about 1, but 2 is usually caused by the COP (Point of Distribution of CRL, basically the situation where the PIX can download the Revocation list from) listed in cert CA is in a format the PIX does not, generally an LDAP URL.

  Check the following prayer:

  Open the administration tool of CA (Certification Authority) then

  (1) right click on the name of CA and choose 'properties '.

  2) click on the tab "Policy Module".

  3) click on the button "configure."

  4) click on the tab "X.509 extensions".

  > From there, it can display the list of the "CRL Distribution Points".

  Turn off everything that isn't HTTP.

  You need to reinstall the CERT in the PIX, I think, but then it should be able to download the CRL through HTTP instead of LDAP.

• Pix 501 for Small Business SERVER 2003 configuration problems

  I am new to cisco equipment. My company recently purchased a firewall of Pix 501 unlimited number of users, it is connected to an internet connection by cable with a dynamic ip address. Internet works fine and so the dhcp server.

  I have a Windows 2003 Small Business Server on our network. I need to configure the firewall to forward ports on the SBS server for remote web workplace.

  Also about a week ago I lost connectivity to the GUI of PDM via my web browser. Telnet and console work perfectly well.

  I enclose my config file.

  Any help will be appreciated. Thank you

  Ed

  FIRT off, you do not have a group-access instruction set for one of your ACL. This means that you have blocked all inbound traffic. You also have your incorrect static instructions. You can start by cleaning your config and enter the correct commands, you should be able to stick to your firewall config mode:

  No list will host 192.168.1.1 acl-enabled access 192.168.1.1

  no access list acl_outside not allowed tcp any any eq www

  no access list acl_inside not allowed tcp any any eq www

  no access list no incoming icmp permitted any one

  No list of permitted no inbound tcp access any host 24.50.241.113 eq https

  No list to access acl - permit gre 192.168.1.1 host 192.168.1.1

  No outside_in not allowed access list tcp any host 24.50.241.113 eq www

  not static (inside, outside) tcp interface www SBSServer www netmask 255.255.255.255 0 0

  not static (inside, outside) tcp interface https SBSServer https netmask 255.255.255.255 0 0

  not static tcp (exterior, Interior) interface www SBSServer www netmask 255.255.255.255 0 0

  not static tcp (exterior, Interior) interface https SBSServer https netmask 255.255.255.255 0 0

  static (inside, outside) tcp 24.50.241.113 80 192.168.1.69 80 netmask 255.255.255.255 0 0

  static (inside, outside) 24.50.241.113 tcp 443 192.168.1.69 443 netmask 255.255.255.255 0 0

  access-list OUT-IN permit tcp any host 24.50.241.113 eq https

  access-list OUT-IN permit tcp any host 24.50.241.113 eq www

  allow to Access-list OUT-IN a whole icmp

  Access-group OUT-IN in interface outside

  What ip you are trying to access your pdm of? the looks of configuration http correct, unless your coming to one other than 192.168.1.x ip address

  Let me know if it works

• PIX 501, 1 static IP, IP address dynamic 2. Mesh full possible?

  I have 3 sites. All sites have PIX 501. Central site has a static IP, 2 remote sites a dynamic IP.

  I have no problem with the connection to the central site by using their dynamic IP address in a remote star connection.

  Is it possible for 2 remote sites communicate? There is data that must be transferred between remote sites. I read somewhere in cisco site web which its possible via mesh on request.

  Does anyone have an example of configuration on a VPN Site to Site where the Central site has static IP and remote sites with a dynamic IP? Remote locations teaches a dynamic IP from remote sites to the central server.

  Thank you.

  With IOS as your hub and then the Yes rays, the rays can learn dynamically address other departments using the PNDH. This type of configuration is called Dynamic Multipoint VPN (DMVPN), you can read everything you need to know about this here:

  http://www.Cisco.com/warp/public/105/DMVPN.html

  Even with EzVPN (not DMVPN) the rays will not learn the address of other rays, all communication is always via the hub. Call another talks would work, but as I said, the packages will talk-star.

• ping for the pix vpn problem

  Hello

  I got a pix 501 (6.3 - 4) on a local network and try to use Cisco VPN Client (4.0.2-D) on a remote pc.

  I can open a vpn session.

  I can't ping from the remote pc to the LAN

  I can ping from any station on the LAN to the remote pc

  After that I did a ping of a station on the LAN to the remote pc, I ping the remote computer to the local network.

  I am so newb, trying for 2 days changing ACLs, no way.

  I must say that I am in dynamic ip wan on the local network and the remote pc.

  Any idea about this problem?

  Any help is welcome.

  Here is the configuration of my pix:

  6.3 (4) version PIX

  interface ethernet0 10baset

  interface ethernet1 100full

  ethernet0 nameif outside security0

  nameif ethernet1 inside the security100

  activate the password * encrypted

  passwd * encrypted

  pixfirewall hostname

  domain ciscopix.com

  clock timezone THATS 1

  clock to summer time CEDT recurring last Sun Mar 02:00 last Sun Oct 03:00

  fixup protocol dns-length maximum 512

  fixup protocol ftp 21

  correction... /...

  fixup protocol tftp 69

  names of

  name 192.168.42.0 Dmi

  inside_access_in ip access list allow a whole

  inside_outbound_nat0_acl ip access list allow any 192.168.229.0 255.255.255.0

  outside_cryptomap_dyn_20 ip access list Dmi 255.255.255.0 allow 192.168.229.32 255.255.255.224

  access-list outside_cryptomap_dyn_20 allow icmp a whole

  pager lines 24

  opening of session

  logging trap information

  Outside 1500 MTU

  Within 1500 MTU

  IP address outside the 209.x.x.x.255.255.224

  IP address inside 192.168.42.40 255.255.255.0

  alarm action IP verification of information

  alarm action attack IP audit

  IP local pool dmivpndhcp 192.168.229.1 - 192.168.229.254

  location of PDM 192.168.229.1 255.255.255.255 outside

  209.165.x.x.x.255.255 PDM location inside

  209.x.x.x.255.255.255 PDM location outdoors

  PDM logging 100 information

  history of PDM activate

  ARP timeout 14400

  Global 1 interface (outside)

  NAT (inside) 0-list of access inside_outbound_nat0_acl

  NAT (inside) 1 0.0.0.0 0.0.0.0 0 0

  Route outside 0.0.0.0 0.0.0.0 209.165.200.225 1

  Timeout xlate 0:05:00

  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

  AAA-server GANYMEDE + 3 max-failed-attempts

  AAA-server GANYMEDE + deadtime 10

  RADIUS Protocol RADIUS AAA server

  AAA-server RADIUS 3 max-failed-attempts

  AAA-RADIUS deadtime 10 Server

  AAA-server local LOCAL Protocol

  Enable http server

  Dmi 255.255.255.0 inside http

  No snmp server location

  No snmp Server contact

  SNMP-Server Community public

  No trap to activate snmp Server

  TFTP server inside the 192.168.42.100.

  enable floodguard

  Permitted connection ipsec sysopt

  AUTH-prompt quick pass

  AUTH-guest accept good

  AUTH-prompt bad rejection

  Crypto ipsec transform-set esp-SHA-ESP-3DES-3des esp-sha-hmac

  Crypto-map dynamic outside_dyn_map 20 the value transform-set ESP-3DES-SHA

  Dynamic crypto map dynmap 20 match address outside_cryptomap_dyn_20

  map outside_map 65535-isakmp ipsec crypto dynamic outside_dyn_map

  outside_map interface card crypto outside

  ISAKMP allows outside

  ISAKMP identity address

  part of pre authentication ISAKMP policy 20

  ISAKMP policy 20 3des encryption

  ISAKMP policy 20 chopping sha

  20 2 ISAKMP policy group

  ISAKMP duration strategy of life 20 86400

  vpngroup address dmivpndhcp pool dmivpn

  vpngroup dns 192.168.42.20 Server dmivpn

  vpngroup dmivpn wins server - 192.168.42.20

  vpngroup dmivpn by default-field defi.local

  vpngroup idle 1800 dmivpn-time

  vpngroup password dmivpn *.

  Telnet timeout 5

  SSH timeout 5

  Console timeout 0

  VPDN username vpnuser password *.

  VPDN allow outside

  VPDN allow inside

  dhcpd address 192.168.42.41 - 192.168.42.72 inside

  dhcpd lease 3600

  dhcpd ping_timeout 750

  Terminal width 80

  Cryptochecksum: *.

  Noelle,

  Add the command: (in config mode): isakmp nat-traversal

  Let me know if it helps.

  Jay

• On PIX 501 6.3 intermittent Internet access (5)

  Hello

  I have a problem of access to the Internet from the local network behind a PIX 501. It worked for months, but suddenly, I discovered that Internet access is intermittent. Internet access works for about 10-15 minutes and then goes down. When I reboot the firewall or disable ARP Internet works again. I turn on debugging with 'debug arp' and I get an error message "arp-in: Dropping request outside the unsolicited nonadjacent ROUTEOUTSIDE 0002.cf69.50cf for 82.x.137.x 0000.0000.0000»

  Any ideas on what could be the problem?

  Thank you for your help.

  Kind regards.

  Hello, Couple of things to check.

  You have ICMP permitted on the external interface of the PIX. If so, can ask you someone to ping from the internet to the external IP address.

  When they ping, can you unplug the external interface and see if they receive a response in return.

  If so, then there is a problem with the access provider. They could give your IP address to another person.

  If this isn't the issue, then you open a TAC case and resolve this problem.

  See you soon,.

  Gilbert

  The rate of this post, if that helps.

• PIX 501 DNS resolution with static route

  I use a pix 501.

  I have an internal DNS server behind the pix that uses my DNS of the ISP servers to resolve external domains.

  Now, I want to host a web site on the same server.

  To allow external access to the web server, I add the following:

  outside_in_http list access permit tcp any host A.B.C.D eq www

  static (inside, outside) A.B.C.D L.M.N.O netmask 255.255.255.255 0 0

  Access-group outside_in_http in interface outside

  It is very good and allows web access. The problem is that the server is able to resolve DNS queries.

  How can I allow my server to resolve DNS again securely. I guess it's pretty simple to do, but I'm having a lot of trouble to find the solution.

  Thanks in advance

  Dylan

  On your IP set dns to 67.38.230.69, then ping www.yahoo.com server from guest... what resovle?

• PIX 501 no connectivity to wide band

  Hey,.

  Just got a pix 501 to put in the office, the problem is, I went through the automatic configuration wizerd and looked in the settings, online, that I can't seem to see dchp outgoing connetion. Is there a setting Im missing. When I hit so he could refresh ip he tells me he cant and frankly Im lost I have a N + so I some knowlage of the installer, but it seems to be difficult to find info on this box anyone help or point me in the right direction on how to get online connectivity.

  thamk you for your time

  William,

  That mark it as resolved!

  This is your post not mine.

  ;-)

• PIX 501

  I have a PIX 501 for my house. Whenever I touch or someone bumps my office that it restarts. It seems that there is a problem with the connector for the physical PIX. I have endured the pain for a while now, but I would possibly solve the problem. Everyone knows the same problem? There was an alert and/or "Recall" on this issue?

  You need to replace it. There is a view of land on this issue

• PIX 501 10 User License

  Does anyone know if the PIX 501 10 user license will limit the number of users can cross a site to site VPN that ends at the PIX?

  Yes, it does, I encountered a problem with it myself in the past. The page at http://www.cisco.com/en/US/customer/products/hw/vpndevc/ps2030/products_data_sheet09186a0080091b18.html

  It is said "the Cisco PIX 501 license 10 users supports up to 10 simultaneous source IP addresses for your internal network to browse the Cisco PIX 501.»

  In my case what happened is that we had a VPN site-to-site created with a small office that adds a little more employees, everything was going well until the 11 IP address attempted to connect to a resource across the IPSec tunnel. We solved the problem by opting for a 50 user license.

• PIX 501 Switch hardware Issue

  My PIX 501 switch stopped working or has failed. The PIX is 10 months old. This is the second time I've seen that happen. The first time I sent it fixed by repair out of warranty, but they couldn't fix it. They said it was a chip owner they could not get from Cisco.

  In any case, the unit has power. I am able to connect through the console and the WAN via SSH port. It is fully operational with the exception of the portion of the switch of the device.

  Has anyone seen this kind of problem before? I've never seen a switch or a hub spoil. It's the second PIX to go wrong in the same local area network installed. PCs and servers all continue networking function wise, so connected to another switch.

  Is that what I can do about this problem?

  Thank you

  Vince

  Vince,

  It depends on what type contract you have. You can open a TAC case and they will let you know the track.

  Let me know if you have any questions.

  Please mark this topic as resolved, so that others can benefit from.

  Kind regards

• VPN between cisco unified customer 3.6.3 and Pix 501 6.2 (1) with the MS CA server

  Hello

  I have Microsoft CA server with the latest support CEP and pix 501 that gets the digital certificate. I also have the client certificate of Cisco, but VPN doesn't work

  In the IPSec Log Viewer, I constantly "CM_IKE_ESTABLISH_FAIL."

  It worked well prior to Win2k server has been completely updated with the latest patches.

  The pix configuration is identical to that of article http://www.cisco.com/warp/public/471/configipsecsmart.html

  I reinstall the stand-alone CA and support CEP server but not had any luck.

  What could be wrong?

  It looks like IKE implementation problem. Make DH group 2 policy ISAKMP.

  Visit this link:

  http://www.Cisco.com/univercd/CC/TD/doc/product/iaabu/PIX/pix_v53/IPSec/exvpncl.htm