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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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............... 10  5.......................................................................................................8  The VPN tunnel is up but I can’t ping ! ............................... 11  5................................ 9  VPN IPSec Troubleshooting .......................................................................x Table of contents 1  Introduction .............................................................7  I clicked on “Open tunnel”.............................. 4  2........................................................................................................1  Goal of this document .............version VPN version tgbvpn_cg-cisco-SA500-series-en 3..............................4  « received remote ID other than expected » error.................. 11  5.................................................................... 11  Contacts ......................3  VPN Client Phase 2 (IPSec) Configuration ..............................................................1  VPN Client Phase 1 (IKE) Configuration ..3  Cisco SA 520W VPN Gateway .............................................................................3  « no keystate » error .................... 13  2  3  4  5  6  IPSec VPN Router Configuration Property of TheGreenBow Sistech SA ............................................................................................................. 3  1.................................. 11  5...........................................2  « INVALID COOKIE » error......................2  VPN Network topology ....................... ................................... 3  1............................................................................................................................................................................ 4  TheGreenBow IPSec VPN Client configuration ................................ 10  5.............Doc..........................2  Cisco SA 520W Settings .......................... 3  1....................................................................................................................... 4  2................................................... 10  5......... 3  1.................................................................... 6  3..............© 2001-2010 2/14 ...................................... but nothing happens............................5  « NO PROPOSAL CHOSEN » error ..................................6  « INVALID ID INFORMATION » error ................................................................ 8  Tools in case of trouble ....................... 6  3.................................................................................................................. 3  Cisco SA 520W Security Appliance VPN configuration .........0 – May 2010 4.2  VPN Client Phase 1 Advanced settings .............. 9  4..............1  Preparation ...1  « PAYLOAD MALFORMED » error (wrong Phase 1 [SA]) .....................................................................4  Cisco SA 520W Security Appliance VPN Gateway product info .................................................................................................. 10  5....1  A good network analyser: Wireshark .................................................................................................................................................................................. 10  5....................................... 7  3..........................................................................................................................4  Open IPSec VPN tunnels .........................................................................................Ref Doc............................................. 7  3......................................................................................................................................................

version VPN version tgbvpn_cg-cisco-SA500-series-en 3.Ref Doc.168.3 Cisco SA 520W VPN Gateway Our tests and VPN configuration have been conducted with Cisco SA 520W router firmware release 1.com/cisco/web/solutions/small_business/products/sec urity/SA_500/index.cisco.de  192.cisco. 1. Cisco SA 520W Product page Cisco SA 520W User Guide Cisco SA 520W FAQ/Knowledge Base http://www.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.2. we will connect TheGreenBow IPSec VPN Client software to the LAN behind the Cisco SA 520W Security Appliance.com.cisco.cisco. Cisco SA 540.html-tab-Models http://www.20 1.com/cisco/web/solutions/small_business/products/sec urity/SA_500/index. The Cisco SA 500 Series includes Cisco SA 520.© 2001-2010 3/14 .2 VPN Network topology In our VPN network example (diagram hereafter).21  Cisco SA 520W 192.1 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.Doc.x 1 Introduction 1. IPSec VPN Client  as seen on LAN  cisco‐gateway.html-tab-Resources IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .2.pdf http://www.2.42.1. All product info.168.1 Internet  IPSec VPN Client  (Remote)  192. All the addresses in this document are given for example purpose.168.0 – May 2010 4. Cisco SA 520W. 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. 1. The VPN client is connected to the Internet with a DSL connection or through a LAN.com/en/US/prod/collateral/vpndevc/ps6032/ps6094/ps 9932/SA500-Brochure.

version VPN version tgbvpn_cg-cisco-SA500-series-en 3.0 – May 2010 4. you must select “VPN” and “VPN Wizard” tabs under “IPSec”.Doc.Ref Doc. IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .© 2001-2010 4/14 .de".de/. For more support. 2. Set Cisco SA 520W parameters and values as shown and click "Apply" to save these settings.1 Preparation To ensure that your Cisco SA 520W VPN router is accessible from the Internet via a domain such as "ciscogateway.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. you should configure a dynamic DNS service.cisco. 2.2 Cisco SA 520W Settings Once connected to your Cisco SA 520W VPN gateway. see your Cisco SA 520W VPN router user manual or under http://www.

x Your Cisco SA 520W is now ready.0 – May 2010 4. 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 .Ref Doc.© 2001-2010 5/14 . the VPN Wizard has automatically created each one corresponding IKE and VPN policies.Doc. Please note that these changes must be considered in the IPSec VPN Client as well.version VPN version tgbvpn_cg-cisco-SA500-series-en 3.

thegreenbow.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. 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.version VPN version tgbvpn_cg-cisco-SA500-series-en 3.© 2001-2010 6/14 . To download the latest release of TheGreenBow IPSec VPN Client software. please go to http://www.com/vpn_down. USB Tokens.html.0 – May 2010 4.Ref Doc.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. This configuration is one example of what can be accomplished in term of User Authentication. 3. OTP Token (One Time Password) or X-Auth combined with RADIUS Server for User Authentication with the Cisco SA 520W Security Appliance. IPSec VPN Router Configuration Property of TheGreenBow Sistech SA . You may use either Preshared key. Certificates.

2 VPN Client Phase 1 Advanced settings Click the "P1 Advanced" to access the Advanced configuration settings of the Phase 1. Confirm the settings by clicking "OK".0 – May 2010 4. Now. Select the option "Aggressive Mode".3 VPN Client Phase 2 (IPSec) Configuration VPN Client Virtual IP  address  Enter the IP address  (and subnet mask)   of the remote LAN.version VPN version tgbvpn_cg-cisco-SA500-series-en 3.© 2001-2010 7/14 . 3.  Phase 2 Configuration IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .Doc.Ref Doc.x 3. and then enter the ID value in the Cisco-defined values. enter the local and remote ID for the VPN Client. Choose DNS as ID type ".

or generate traffic that will automatically open a secure IPSec VPN Tunnel (e. ping. Select "Console" if you want to access to the IPSec VPN logs and adjust filters to display less IPSec messaging. IPSec VPN Router Configuration Property of TheGreenBow Sistech SA . Select "Connections" to see opened VPN Tunnels 4. you are ready to open VPN tunnels.4 Open IPSec VPN tunnels Once both Cisco SA 520W router and TheGreenBow IPSec VPN Client software have been configured accordingly. The following example shows a successful connection between TheGreenBow IPSec VPN Client and a Cisco SA 520W VPN router. 1.g. Click on "Save & Apply" to take into account all modifications we've made on your VPN Client configuration 2. IE browser) 3.0 – May 2010 4. Click on "Open Tunnel".Doc.x 3. First make sure you enable your firewall with IPSec traffic.© 2001-2010 8/14 .Ref Doc.version VPN version tgbvpn_cg-cisco-SA500-series-en 3.

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

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). Reset the VPN connection on each side.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. 5. it means that one of the endpoint is using a SA that is no more in use. 5.2 « INVALID COOKIE » error 115933 Default message_recv: invalid cookie(s) 5918ca0c2634288f 7364e3e486e49105 115933 Default dropped message from 195.Ref Doc.205. You should have more information in the remote endpoint logs.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 195.100.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.version VPN version tgbvpn_cg-cisco-SA500-series-en 3.114 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].Doc. check if the encryption algorithms are the same on each side of the VPN tunnel. 5.0 – May 2010 4.114 port 500 due to notification type INVALID_COOKIE 115933 Default SEND Informational [NOTIFY] with INVALID_COOKIE error If you have an « INVALID COOKIE » error. IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .x 5 VPN IPSec Troubleshooting 5.205.© 2001-2010 10/14 .100.

7 I clicked on “Open tunnel”.112.100. An IPSec Client uses UDP port 500 and protocol ESP (protocol 50). Check that every device between the client and the VPN server does accept ESP • Check your VPN server logs. responder id c364cd72: 195. 5. but nothing happens. but you still cannot ping the remote LAN.version VPN version tgbvpn_cg-cisco-SA500-series-en 3. you are using a IPV4_ADDR type (and not a IPV4_SUBNET type).114.205. Read logs of each VPN tunnel endpoint.100.112. This protocol can be blocked by firewall. Usually. IKE requests can be dropped by firewalls. Check also ID type (“Subnet address” and “Single address”).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: 195.100. src: 195.Doc.100. packets are sent with ESP protocol.x 5.205. If network mask is not check. src: 195.205.205.0 – May 2010 4. responder id c364cd72: 195.100.114 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.100.114.205.205.205. 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. check if « Phase 2 » ID (local address and network address) is correct and match what is expected by the remote endpoint. VPN Client IP address should not belong to the remote LAN subnet • Once VPN tunnel is up.Ref Doc.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.112 dst: 195.5 « 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. check that the « Phase 2 » encryption algorithms are the same on each side of the VPN Tunnel. here are a few guidelines: • Check Phase 2 settings: VPN Client address and Remote LAN address.112 dst: 195. Packets can be dropped by one of its firewall rules.100.© 2001-2010 11/14 .205.100.8 The VPN tunnel is up but I can’t ping ! If the VPN tunnel is up. • Check your ISP support ESP IPSec VPN Router Configuration Property of TheGreenBow Sistech SA . 5.

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

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

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