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

x 1 Introduction 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.html-tab-Models http://www.com/cisco/web/solutions/small_business/products/sec urity/SA_500/index.Ref Doc. Cisco SA 520W Product page Cisco SA 520W User Guide Cisco SA 520W FAQ/Knowledge Base http://www.168.© 2001-2010 3/14 .com/cisco/web/solutions/small_business/products/sec urity/SA_500/index.html-tab-Resources IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .cisco.168.Doc.2.com.version VPN version tgbvpn_cg-cisco-SA500-series-en 3.20 1. 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.cisco. IPSec VPN Client  as seen on LAN  cisco‐gateway.2.cisco. we will connect TheGreenBow IPSec VPN Client software to the LAN behind the Cisco SA 520W Security Appliance. The Cisco SA 500 Series includes Cisco SA 520. The VPN client is connected to the Internet with a DSL connection or through a LAN. Cisco SA 520W.1.2.4 Cisco SA 520W Security Appliance VPN Gateway product info It is critical that users find all necessary information about Cisco SA 520W VPN Gateway.3 Cisco SA 520W VPN Gateway Our tests and VPN configuration have been conducted with Cisco SA 520W router firmware release 1.42.21  Cisco SA 520W 192.cisco. All product info.de  192.0 – May 2010 4.168. 1. 1.com/en/US/prod/collateral/vpndevc/ps6032/ps6094/ps 9932/SA500-Brochure.pdf http://www. All the addresses in this document are given for example purpose.2 VPN Network topology In our VPN network example (diagram hereafter).1 Internet  IPSec VPN Client  (Remote)  192. Cisco SA 540.

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

IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .Ref Doc.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.© 2001-2010 5/14 . the VPN Wizard has automatically created each one corresponding IKE and VPN policies.x Your Cisco SA 520W is now ready.0 – May 2010 4. Please note that these changes must be considered in the IPSec VPN Client as well.

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

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

First make sure you enable your firewall with IPSec traffic.version VPN version tgbvpn_cg-cisco-SA500-series-en 3. you are ready to open VPN tunnels. ping. IPSec VPN Router Configuration Property of TheGreenBow Sistech SA . The following example shows a successful connection between TheGreenBow IPSec VPN Client and a Cisco SA 520W VPN router. Select "Console" if you want to access to the IPSec VPN logs and adjust filters to display less IPSec messaging.g. Select "Connections" to see opened VPN Tunnels 4.0 – May 2010 4.© 2001-2010 8/14 . IE browser) 3.Doc. or generate traffic that will automatically open a secure IPSec VPN Tunnel (e.x 3.4 Open IPSec VPN tunnels Once both Cisco SA 520W router and TheGreenBow IPSec VPN Client software have been configured accordingly.Ref Doc. 1. Click on "Open Tunnel". Click on "Save & Apply" to take into account all modifications we've made on your VPN Client configuration 2.

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

© 2001-2010 10/14 . it means that one of the endpoint is using a SA that is no more in use. 5.4 « 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.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).Doc. check if the encryption algorithms are the same on each side of the VPN tunnel.205. 5.version VPN version tgbvpn_cg-cisco-SA500-series-en 3.205. Reset the VPN connection on each side.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. 5. You should have more information in the remote endpoint logs. IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .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].100.Ref Doc.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.100.2 « INVALID COOKIE » error 115933 Default message_recv: invalid cookie(s) 5918ca0c2634288f 7364e3e486e49105 115933 Default dropped message from 195.0 – May 2010 4.x 5 VPN IPSec Troubleshooting 5.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.

Ref Doc. here are a few guidelines: • Check Phase 2 settings: VPN Client address and Remote LAN address.version VPN version tgbvpn_cg-cisco-SA500-series-en 3. packets are sent with ESP protocol.© 2001-2010 11/14 . Packets can be dropped by one of its firewall rules. 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 5.205.100.205.100. If network mask is not check. An IPSec Client uses UDP port 500 and protocol ESP (protocol 50). but you still cannot ping the remote LAN. responder id c364cd72: 195.114 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. src: 195. responder id c364cd72: 195. check that the « Phase 2 » encryption algorithms are the same on each side of the VPN Tunnel.100.205.112 dst: 195.114.5 « 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: 195.114 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. but nothing happens. Read logs of each VPN tunnel endpoint.205. VPN Client IP address should not belong to the remote LAN subnet • Once VPN tunnel is up. 5.100. you are using a IPV4_ADDR type (and not a IPV4_SUBNET type).100.205. • Check your ISP support ESP IPSec VPN Router Configuration Property of TheGreenBow Sistech SA .Doc.7 I clicked on “Open tunnel”.205.205.114.x 5. Usually.8 The VPN tunnel is up but I can’t ping ! If the VPN tunnel is up. src: 195.100. 5.0 – May 2010 4. check if « Phase 2 » ID (local address and network address) is correct and match what is expected by the remote endpoint.100.112.205.112. IKE requests can be dropped by firewalls. Check that every device between the client and the VPN server does accept ESP • Check your VPN server logs.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. This protocol can be blocked by firewall. Check also ID type (“Subnet address” and “Single address”).112 dst: 195.100.

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

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

Simple.Secure. Strong. TheGreenBow Security Software .