TheGreenBow IPSec VPN Client Configuration Guide

Cisco SA 500 Series Security Appliance
This guide applies to the following models:

Cisco SA 520 Cisco SA 520W Cisco SA 540
WebSite: Contact: http://www.thegreenbow.de support@thegreenbow.de

Configuration Guide written by: Writer: Company: Timm Richter www.thegreenbow.de

IPSec VPN Router Configuration

Property of TheGreenBow Sistech SA - © 2001-2010

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....1  VPN Client Phase 1 (IKE) Configuration ............ 11  5..............................................................version VPN version tgbvpn_cg-cisco-SA500-series-en 3................................................................................................................ 10  5............................................. 10  5........................................... ............................................................... 6  3.... 10  5...... 4  TheGreenBow IPSec VPN Client configuration .............. 13  2  3  4  5  6  IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .. 11  5................................................. but nothing happens............................................... 3  1...............2  Cisco SA 520W Settings ............................................................................... 4  2........................................................................................................................................... 4  2.......................................................................7  I clicked on “Open tunnel”...................................................................................................................4  « received remote ID other than expected » error........................................................................3  « no keystate » error ..................................................................................................................................................................................................................1  Goal of this document ................................. 3  1..........1  Preparation .........................................................................................8  The VPN tunnel is up but I can’t ping ! ...................3  Cisco SA 520W VPN Gateway ............4  Open IPSec VPN tunnels .......................................................................... 9  4..........................Doc..................3  VPN Client Phase 2 (IPSec) Configuration ....2  VPN Client Phase 1 Advanced settings .......................© 2001-2010 2/14 .....................................................................2  « INVALID COOKIE » error...........................................................1  « PAYLOAD MALFORMED » error (wrong Phase 1 [SA]) ............. 8  Tools in case of trouble ... 11  Contacts ...................................................................... 7  3........................x Table of contents 1  Introduction ................................................................................ 10  5......................................................................................................... 3  1................. 6  3..................... 11  5..6  « INVALID ID INFORMATION » error ................................................................2  VPN Network topology ................................................................. 7  3............1  A good network analyser: Wireshark ........................................................ 9  VPN IPSec Troubleshooting .................................................................................................................. 3  1......................................... 3  Cisco SA 520W Security Appliance VPN configuration ........................................................Ref Doc.......................5  « NO PROPOSAL CHOSEN » error ..........................................................................................................4  Cisco SA 520W Security Appliance VPN Gateway product info ................................................................................................................................................ 10  5.............................0 – May 2010 4..............................................

42. The Cisco SA 500 Series includes Cisco SA 520. 1.2.x 1 Introduction 1.2.html-tab-Models http://www. Cisco SA 520W Product page Cisco SA 520W User Guide Cisco SA 520W FAQ/Knowledge Base http://www. All product info.2 VPN Network topology In our VPN network example (diagram hereafter).cisco. The VPN client is connected to the Internet with a DSL connection or through a LAN. IPSec VPN Client  as seen on LAN  cisco‐gateway.Ref Doc.com/cisco/web/solutions/small_business/products/sec urity/SA_500/index.cisco.3 Cisco SA 520W VPN Gateway Our tests and VPN configuration have been conducted with Cisco SA 520W router firmware release 1. Cisco SA 520W.21  Cisco SA 520W 192.2.cisco.20 1. All the addresses in this document are given for example purpose.cisco.168. 1.de  192.4 Cisco SA 520W Security Appliance VPN Gateway product info It is critical that users find all necessary information about Cisco SA 520W VPN Gateway.html-tab-Resources IPSec VPN Router Configuration Property of TheGreenBow Sistech SA . User Guide and knowledge base for the Cisco SA 520W VPN Gateway can be found on the Cisco SA 520W Security Appliance website: http://www.168.© 2001-2010 3/14 .com.version VPN version tgbvpn_cg-cisco-SA500-series-en 3.0 – May 2010 4. we will connect TheGreenBow IPSec VPN Client software to the LAN behind the Cisco SA 520W Security Appliance.168.pdf http://www.com/en/US/prod/collateral/vpndevc/ps6032/ps6094/ps 9932/SA500-Brochure.com/cisco/web/solutions/small_business/products/sec urity/SA_500/index.Doc.1 Internet  IPSec VPN Client  (Remote)  192. Cisco SA 540.1.1 Goal of this document This configuration guide describes how to configure TheGreenBow IPSec VPN Client software with a Cisco SA 520W VPN router to establish VPN connections for remote access to corporate network.

IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .de". 2. you must select “VPN” and “VPN Wizard” tabs under “IPSec”. you should configure a dynamic DNS service. see your Cisco SA 520W VPN router user manual or under http://www.1 Preparation To ensure that your Cisco SA 520W VPN router is accessible from the Internet via a domain such as "ciscogateway.2 Cisco SA 520W Settings Once connected to your Cisco SA 520W VPN gateway. 2.© 2001-2010 4/14 .de/.version VPN version tgbvpn_cg-cisco-SA500-series-en 3.cisco. For more support.0 – May 2010 4.x 2 Cisco SA 520W Security Appliance VPN configuration This section describes how to build an IPSec VPN configuration with your Cisco SA 520W VPN router.Ref Doc. Set Cisco SA 520W parameters and values as shown and click "Apply" to save these settings.Doc.

the VPN Wizard has automatically created each one corresponding IKE and VPN policies.x Your Cisco SA 520W is now ready.Ref Doc.version VPN version tgbvpn_cg-cisco-SA500-series-en 3. Under the menu "IKE Policies" and "VPN Policies" you can make further detailed settings for the tunnel configuration. IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .0 – May 2010 4.Doc. Please note that these changes must be considered in the IPSec VPN Client as well.© 2001-2010 5/14 .

version VPN version tgbvpn_cg-cisco-SA500-series-en 3.thegreenbow. 3. You may use either Preshared key.html. IPSec VPN Router Configuration Property of TheGreenBow Sistech SA . To download the latest release of TheGreenBow IPSec VPN Client software.Ref Doc. You may want to refer to either the Cisco SA 520W Security Appliance user guide or TheGreenBow IPSec VPN Client software User Guide for more details on User Authentication options. USB Tokens. Certificates.com/vpn_down.0 – May 2010 4. please go to http://www. OTP Token (One Time Password) or X-Auth combined with RADIUS Server for User Authentication with the Cisco SA 520W Security Appliance. This configuration is one example of what can be accomplished in term of User Authentication.1 VPN Client Phase 1 (IKE) Configuration The remote VPN  Gateway IP address is a  DNS Name  Preshared as defined in  Cisco VPN router  Phase 1 configuration For User Authentication we are using the Preshared Key method in this example.© 2001-2010 6/14 .x 3 TheGreenBow IPSec VPN Client configuration This section describes the required configuration to connect to a Cisco SA 520W VPN router via VPN connections.Doc.

Confirm the settings by clicking "OK".version VPN version tgbvpn_cg-cisco-SA500-series-en 3. Now.Ref Doc. 3.x 3. Select the option "Aggressive Mode". and then enter the ID value in the Cisco-defined values. enter the local and remote ID for the VPN Client.© 2001-2010 7/14 .  Phase 2 Configuration IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .2 VPN Client Phase 1 Advanced settings Click the "P1 Advanced" to access the Advanced configuration settings of the Phase 1. Choose DNS as ID type ".0 – May 2010 4.3 VPN Client Phase 2 (IPSec) Configuration VPN Client Virtual IP  address  Enter the IP address  (and subnet mask)   of the remote LAN.Doc.

or generate traffic that will automatically open a secure IPSec VPN Tunnel (e.x 3.Doc. First make sure you enable your firewall with IPSec traffic.© 2001-2010 8/14 . Click on "Save & Apply" to take into account all modifications we've made on your VPN Client configuration 2. Select "Console" if you want to access to the IPSec VPN logs and adjust filters to display less IPSec messaging.g. IE browser) 3. ping. Click on "Open Tunnel". 1.version VPN version tgbvpn_cg-cisco-SA500-series-en 3. IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .0 – May 2010 4. Select "Connections" to see opened VPN Tunnels 4. you are ready to open VPN tunnels. The following example shows a successful connection between TheGreenBow IPSec VPN Client and a Cisco SA 520W VPN router.4 Open IPSec VPN tunnels Once both Cisco SA 520W router and TheGreenBow IPSec VPN Client software have been configured accordingly.Ref Doc.

© 2001-2010 9/14 . read its specific documentation (http://www. This tool is available on website http://www. One missing parameter can prevent a VPN connection from being established.version VPN version tgbvpn_cg-cisco-SA500-series-en 3. IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .0 – May 2010 4.x 4 Tools in case of trouble Configuring an IPSec VPN tunnel can be a hard task. For installation and use details.wireshark.org/docs/).org.Ref Doc. It can be used to follow protocol exchange between two devices. Some tools are available to find source of troubles during a VPN establishment.Doc.wireshark. 4. It shows IP or TCP packets received on a network card.1 A good network analyser: Wireshark Wireshark is a free software that can be used for packet and traffic analysis.

Doc.4 « received remote ID other than expected » error 120348 Default (SA CNXVPN1-P1) SEND phase 1 Main 120349 Default (SA CNXVPN1-P1) RECV phase 1 Main 120349 Default (SA CNXVPN1-P1) SEND phase 1 Main 120351 Default (SA CNXVPN1-P1) RECV phase 1 Main 120351 Default (SA CNXVPN1-P1) SEND phase 1 Main 120351 Default (SA CNXVPN1-P1) RECV phase 1 Main 120351 Default ike_phase_1_recv_ID: received support@thegreenbow.100.fr Mode [SA][VID] Mode [SA][VID] Mode [KEY][NONCE] Mode [KEY][NONCE] Mode [ID][HASH][NOTIFY] Mode [ID][HASH][NOTIFY] remote ID other than expected The « Remote ID » value (see « Advanced » Button) does not match what the remote endpoint is expected. Reset the VPN connection on each side.Ref Doc.3 « no keystate » error 115315 115317 115317 115319 115319 115319 Default Default Default Default Default Default (SA CNXVPN1-P1) SEND phase 1 Main Mode [SA][VID] (SA CNXVPN1-P1) RECV phase 1 Main Mode [SA][VID] (SA CNXVPN1-P1) SEND phase 1 Main Mode [KEY][NONCE] (SA CNXVPN1-P1) RECV phase 1 Main Mode [KEY][NONCE] (SA CNXVPN1-P1) SEND phase 1 Main Mode [ID][HASH][NOTIFY] ipsec_get_keystate: no keystate in ISAKMP SA 00B57C50 Check if the preshared key is correct or if the local ID is correct (see « Advanced » button).2 « INVALID COOKIE » error 115933 Default message_recv: invalid cookie(s) 5918ca0c2634288f 7364e3e486e49105 115933 Default dropped message from 195.205. IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .1 « PAYLOAD MALFORMED » error (wrong Phase 1 [SA]) 114920 Default (SA CNXVPN1-P1) SEND phase 1 Main Mode [SA][VID] 114920 Default (SA CNXVPN1-P1) RECV phase 1 Main Mode [NOTIFY] 114920 Default exchange_run: exchange_validate failed 114920 Default dropped message from 195. it means that one of the endpoint is using a SA that is no more in use. You should have more information in the remote endpoint logs.114 port 500 due to notification type PAYLOAD_MALFORMED 114920 Default SEND Informational [NOTIFY] with PAYLOAD_MALFORMED error If you have an « PAYLOAD MALFORMED » error you might have a wrong Phase 1 [SA].© 2001-2010 10/14 .x 5 VPN IPSec Troubleshooting 5. 5.205. 5.0 – May 2010 4. check if the encryption algorithms are the same on each side of the VPN tunnel.100.version VPN version tgbvpn_cg-cisco-SA500-series-en 3.114 port 500 due to notification type INVALID_COOKIE 115933 Default SEND Informational [NOTIFY] with INVALID_COOKIE error If you have an « INVALID COOKIE » error. 5.

you are using a IPV4_ADDR type (and not a IPV4_SUBNET type).112 dst: 195.112.100. This protocol can be blocked by firewall.100.205.100.5 « NO PROPOSAL CHOSEN » error 115911 Default (SA CNXVPN1-P1) SEND phase 1 Main Mode [SA][VID] 115913 Default (SA CNXVPN1-P1) RECV phase 1 Main Mode [SA][VID] 115913 Default (SA CNXVPN1-P1) SEND phase 1 Main Mode [KEY][NONCE] 115915 Default (SA CNXVPN1-P1) RECV phase 1 Main Mode [KEY][NONCE] 115915 Default (SA CNXVPN1-P1) SEND phase 1 Main Mode [ID][HASH][NOTIFY] 115915 Default (SA CNXVPN1-P1) RECV phase 1 Main Mode [ID][HASH][NOTIFY] 115915 Default phase 1 done: initiator id c364cd70: 195.112.205.112 dst: 195.205.100. Read logs of each VPN tunnel endpoint. src: 195. but you still cannot ping the remote LAN.205. 5.Doc.6 « INVALID ID INFORMATION » error 122623 Default (SA CNXVPN1-P1) SEND phase 1 Main Mode [SA][VID] 122625 Default (SA CNXVPN1-P1) RECV phase 1 Main Mode [SA][VID] 122625 Default (SA CNXVPN1-P1) SEND phase 1 Main Mode [KEY][NONCE] 122626 Default (SA CNXVPN1-P1) RECV phase 1 Main Mode [KEY][NONCE] 122626 Default (SA CNXVPN1-P1) SEND phase 1 Main Mode [ID][HASH][NOTIFY] 122626 Default (SA CNXVPN1-P1) RECV phase 1 Main Mode [ID][HASH][NOTIFY] 122626 Default phase 1 done: initiator id c364cd70: 195.205.0 – May 2010 4.100.100. If network mask is not check. Usually.version VPN version tgbvpn_cg-cisco-SA500-series-en 3. responder id c364cd72: 195. IKE requests can be dropped by firewalls.100. Check also ID type (“Subnet address” and “Single address”). 5.205. • Check your ISP support ESP IPSec VPN Router Configuration Property of TheGreenBow Sistech SA . check if « Phase 2 » ID (local address and network address) is correct and match what is expected by the remote endpoint. An IPSec Client uses UDP port 500 and protocol ESP (protocol 50).114 122626 Default (SA CNXVPN1-CNXVPN1-P2) SEND phase 2 Quick Mode [SA][KEY][ID][HASH][NONCE] 122626 Default RECV Informational [HASH][NOTIFY] with INVALID_ID_INFORMATION error 122626 Default RECV Informational [HASH][DEL] 122626 Default CNXVPN1-P1 deleted If you have an « INVALID ID INFORMATION » error.114.114 115915 Default (SA CNXVPN1-CNXVPN1-P2) SEND phase 2 Quick Mode [SA][KEY][ID][HASH][NONCE] 115915 Default RECV Informational [HASH][NOTIFY] with NO_PROPOSAL_CHOSEN error 115915 Default RECV Informational [HASH][DEL] 115915 Default CNXVPN1-P1 deleted If you have an « NO PROPOSAL CHOSEN » error. responder id c364cd72: 195. here are a few guidelines: • Check Phase 2 settings: VPN Client address and Remote LAN address. src: 195. Packets can be dropped by one of its firewall rules.x 5. but nothing happens.114.205. packets are sent with ESP protocol.100. Check that every device between the client and the VPN server does accept ESP • Check your VPN server logs. check that the « Phase 2 » encryption algorithms are the same on each side of the VPN Tunnel.205. VPN Client IP address should not belong to the remote LAN subnet • Once VPN tunnel is up. Check « Phase 1 » algorithms if you have this: 115911 Default (SA CNXVPN1-P1) SEND phase 1 Main Mode [SA][VID] 115911 Default RECV Informational [NOTIFY] with NO_PROPOSAL_CHOSEN error 5.Ref Doc.7 I clicked on “Open tunnel”.© 2001-2010 11/14 .8 The VPN tunnel is up but I can’t ping ! If the VPN tunnel is up.

You must specify their IP address inside the LAN. You can check that your pings arrive inside the LAN. We recommend you to install Wireshark (http://www. IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .version VPN version tgbvpn_cg-cisco-SA500-series-en 3.Doc.0 – May 2010 4. You cannot access to the computers in the LAN by their name.x • • • • If you still cannot ping. follow ICMP traffic on VPN server LAN interface and on LAN computer interface (with Wireshark for example).Ref Doc. A target on your remote LAN can receive pings but does not answer because there is a no “Default gateway” setting.© 2001-2010 12/14 . You will have an indication that encryption works. Check the “default gateway” value in VPN Server LAN.org) on one of your target computer.wireshark.

thegreenbow.com Technical support by email at support@thegreenbow.com Sales contacts by email at sales@thegreenbow.Doc.version VPN version tgbvpn_cg-cisco-SA500-series-en 3.com IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .© 2001-2010 13/14 .Ref Doc.0 – May 2010 4.x 6 Contacts News and updates on TheGreenBow web site: http://www.

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