Document ID: 98528
Updated: Oct 02, 2008
Contents
Introduction
This document provides a sample configuration for IPsec between a Cisco PIX 515E and Cisco Adaptive Security Appliance (ASA) 5505 that uses Easy VPN with Network Extension Mode (NEM). A Cisco Easy VPN solution consists of an Easy VPN server at the main site and Easy VPN hardware clients at the remote offices. The Cisco ASA 5505 can function as a Cisco Easy VPN hardware client or as a Cisco Easy VPN server, which is sometimes called a headend device, but not both at the same time. Here, in our topology Cisco PIX 515E acts as the Easy VPN server and the ASA 5505 acts as the Easy VPN remote client (Hardware Client).
The Easy VPN hardware client supports one of two modes of operation: Client Mode or Network Extension Mode (NEM). The mode of operation determines whether the hosts behind the Easy VPN hardware client are accessible from the enterprise network over the tunnel.
Client Mode, also called Port Address Translation (PAT) mode, isolates all devices on the Easy VPN client private network from those on the enterprise network. The Easy VPN client performs PAT for all VPN traffic for its inside hosts. IP address management is neither required for the Easy VPN client inside interface or the inside hosts.
NEM makes the inside interface and all inside hosts routable across the enterprise network over the tunnel. Hosts on the inside network obtain their IP addresses from an accessible subnet (statically or with DHCP) that is preconfigured with static IP addresses. PAT does not apply to VPN traffic in NEM. This mode does not require a VPN configuration for each client. The ASA 5505 configured for NEM mode supports automatic tunnel initiation. The configuration must store the group name, username, and password.
Automatic tunnel initiation is disabled if secure unit authentication is enabled. The network and addresses on the private side of the Easy VPN client are hidden, and cannot be accessed directly.
The Easy VPN hardware client does not have a default mode. But, if you do not specify the mode in Adaptive Security Device Manager (ASDM), ASDM automatically selects client mode. When you configure the Easy VPN hardware client with the use of the CLI, you must specify a mode.
Refer to PIX/ASA 7.x Easy VPN with an ASA 5500 as the Server and Cisco 871 as the Easy VPN Remote Configuration Example for more information on a similar scenario where the Cisco 871 Router acts as the Easy VPN Remote.
Prerequisites
Requirements
Ensure that you meet these requirements before you attempt this configuration:
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A basic understanding of
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IPsec
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Easy VPN
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ASA/PIX Security Appliances
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Components Used
The information in this document is based on these software and hardware versions:
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The Easy VPN Remote Hardware client is a ASA 5505 that runs version 7.2(1) and later.
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The Easy VPN Server is an PIX 515E that runs version 7.x and later.
Note: The Easy VPN Server configuration in this document are applicable to both PIX/ASA runs with version 7.x and later.
Note: Easy VPN client configuration is only supported on ASA 5505.
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
Conventions
Refer to the Cisco Technical Tips Conventions for more information on document conventions.
Background Information
If you use an Easy VPN solution, this simplifies the deployment and management of a VPN in these ways:
In this configuration example, an IPsec tunnel is configured with these elements:
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Hosts at remote sites no longer have to run VPN client software.
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Security policies reside on a central server and are pushed to the remote hardware clients when a VPN connection is established.
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Few configuration parameters need to be set locally, which minimizes the need for on-site administration.
When used as an Easy VPN hardware client, the ASA 5505 can also be configured to perform basic firewall services, such as to protect devices in a DMZ from unauthorized access. But, if the ASA 5505 is configured to function as an Easy VPN hardware client, it cannot establish other types of tunnels. For example, the ASA 5505 cannot function simultaneously as an Easy VPN hardware client and as one end of a standard peer-to-peer VPN deployment
Configure
In this section, you are presented with the information to configure the features described in this document.
Note: Use the Command Lookup Tool (registered customers only) in order to obtain more information on the commands used in this section.
Network Diagram
When configured in Easy VPN Network Extension Mode, the ASA 5505 does not hide the IP addresses of local hosts by the substitution of a public IP address. Therefore, hosts on the other side of the VPN connection can communicate directly with hosts on the local network. When you configure NEM, the network behind the Easy VPN client should not overlap your the network behind the Easy VPN server. The Figure shows a sample network topology with the ASA 5505 that runs in Network Extension Mode.
Configurations
This document uses these configurations:
| Easy VPN Server (PIX 515E) |
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pixfirewall#write terminal PIX Version 8.0(2) ! hostname pixfirewall enable password 8Ry2YjIyt7RRXU24 encrypted names ! !--- Configure the outside and inside interfaces. interface Ethernet0 nameif outside security-level 0 ip address 10.20.20.1 255.255.255.0 ! interface Ethernet1 nameif inside security-level 100 ip address 172.22.1.1 255.255.255.0 ! !--- Output Suppressed ! interface Ethernet5 shutdown no nameif no security-level no ip address ! passwd 2KFQnbNIdI.2KYOU encrypted ftp mode passive !--- This access list is used for a nat zero command that prevents !--- traffic, which matches the access list, so it does !--- not undergo network address translation (NAT). access-list no-nat extended permit ip 172.22.1.0 255.255.255.0 172.16.1.0 255.255.255.0 !--- This access list is used to define the traffic !--- that should pass through the tunnel. !--- It is bound to the group policy, which defines !--- a dynamic crypto map. access-list ezvpn1 extended permit ip 172.22.1.0 255.255.255.0 172.16.1.0 255.255.255.0 pager lines 24 mtu outside 1500 mtu inside 1500 no failover icmp unreachable rate-limit 1 burst-size 1 asdm image flash:/asdm-602.bin no asdm history enable arp timeout 14400 !--- Specify the NAT configuration. !--- NAT 0 prevents NAT for the ACL defined in this configuration. !--- The nat 1 command specifies NAT for all other traffic. global (outside) 1 interface nat (inside) 0 access-list no-nat nat (inside) 1 0.0.0.0 0.0.0.0 route outside 0.0.0.0 0.0.0.0 10.20.20.2 1 timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout uauth 0:05:00 absolute dynamic-access-policy-record DfltAccessPolicy no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart !--- PHASE 2 CONFIGURATION ---! !--- The encryption types for Phase 2 are defined here. !--- A single DES encryption with !--- the md5 hash algorithm is used. crypto ipsec transform-set mySET esp-des esp-md5-hmac !--- This command defines a dynamic crypto map !--- with the specified encryption settings. crypto dynamic-map myDYN-MAP 5 set transform-set mySET !--- This command binds the dynamic map to !--- the IPsec/ISAKMP process. crypto map myMAP 60 ipsec-isakmp dynamic myDYN-MAP !--- This command specifies the interface to be used !--- with the settings defined in this configuration. crypto map myMAP interface outside !--- PHASE 1 CONFIGURATION ---! !--- This configuration uses isakmp policy 1. !--- Policy 65535 is included in the default !--- configuration. These configuration commands !--- define the Phase 1 policies that are used. crypto isakmp enable outside crypto isakmp policy 1 authentication pre-share encryption des hash md5 group 2 lifetime 86400 crypto isakmp policy 65535 authentication pre-share encryption 3des hash sha group 2 lifetime 86400 telnet timeout 5 ssh timeout 5 console timeout 0 threat-detection basic-threat threat-detection statistics access-list ! class-map inspection_default match default-inspection-traffic ! ! policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect netbios inspect rsh inspect rtsp inspect skinny inspect esmtp inspect sqlnet inspect sunrpc inspect tftp inspect sip inspect xdmcp ! service-policy global_policy global !--- This defines the group policy you use with Easy VPN. !--- Specify the networks that should pass through !--- the tunnel and that you want to !--- use network extension mode. group-policy myGROUP internal group-policy myGROUP attributes split-tunnel-policy tunnelspecified split-tunnel-network-list value ezvpn1 nem enable !--- The username and password associated with !--- this VPN connection are defined here. You !--- can also use AAA for this function. username cisco password 3USUcOPFUiMCO4Jk encrypted !--- The tunnel-group commands bind the configurations !--- defined in this configuration to the tunnel that is !--- used for Easy VPN. This tunnel name is the one !--- specified on the remote side. tunnel-group mytunnel type ipsec-ra tunnel-group mytunnel general-attributes default-group-policy myGROUP tunnel-group mytunnel ipsec-attributes !--- The pre-shared-key used is "cisco". pre-shared-key * prompt hostname context Cryptochecksum:a16e3c19d5b2ab400151e0c13d26b074 : end |
| ASA 5505 - Easy VPN Remote Hardware Client |
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ciscoasa#write terminal : ASA Version 8.0(2) ! hostname ciscoasa enable password 8Ry2YjIyt7RRXU24 encrypted names ! interface Vlan1 nameif inside security-level 100 ip address 172.16.1.1 255.255.255.0 ! interface Vlan2 nameif outside security-level 0 ip address 10.10.10.1 255.255.255.0 ! interface Ethernet0/0 switchport access vlan 2 ! interface Ethernet0/1 ! !--- Output Suppressed ! interface Ethernet0/7 shutdown ! passwd 2KFQnbNIdI.2KYOU encrypted boot system disk0:/asa802-k8.bin ftp mode passive pager lines 24 mtu inside 1500 mtu outside 1500 no failover icmp unreachable rate-limit 1 burst-size 1 asdm image disk0:/asdm-602.bin no asdm history enable arp timeout 14400 !--- Set the standard NAT configuration. !--- Easy VPN provides the NAT exceptions needed. global (outside) 1 interface nat (inside) 1 0.0.0.0 0.0.0.0 0 0 route outside 0.0.0.0 0.0.0.0 10.10.10.2 1 timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout uauth 0:05:00 absolute dynamic-access-policy-record DfltAccessPolicy no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart telnet timeout 5 ssh timeout 5 console timeout 0 !--- Easy VPN Client Configuration ---! !--- Specify the IP address of the VPN server. vpnclient server 10.20.20.1 !--- This example uses network extension mode. vpnclient mode network-extension-mode !--- Specify the group name and the pre-shared key. vpnclient vpngroup mytunnel password ******** !--- Specify the authentication username and password. vpnclient username cisco password ******** !--- In order to enable the device as hardware vpnclient, use this command. vpnclient enable threat-detection basic-threat threat-detection statistics access-list ! class-map inspection_default match default-inspection-traffic ! !--- Output suppressed ! service-policy global_policy global prompt hostname context Cryptochecksum:dfcc004fbc2988e4370226f8d592b205 : end |
Verify
Use this section in order to confirm that your configuration works properly.
The Output Interpreter Tool (registered customers only) (OIT) supports certain show commands. Use the OIT in order to view an analysis of show command output.
PIX Easy VPN Server show Commands and Sample Output
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show crypto isakmp sa—This command displays all current Internet Key Exchange (IKE) security associations (SA) at a peer.
pixfirewall#show crypto isakmp sa Active SA: 1 Rekey SA: 0 (A tunnel will report 1 Active and 1 Rekey SA during rekey) Total IKE SA: 1 1 IKE Peer: 10.10.10.1 Type : user Role : responder Rekey : no State : AM_ACTIVE -
show crypto ipsec sa—This command displays IPsec SAs built between peers.
pixfirewall#show crypto ipsec sa interface: outside Crypto map tag: myDYN-MAP, seq num: 5, local addr: 10.20.20.1 local ident (addr/mask/prot/port): (172.22.1.0/255.255.255.0/0/0) remote ident (addr/mask/prot/port): (172.16.1.0/255.255.255.0/0/0) current_peer: 10.10.10.1, username: cisco dynamic allocated peer ip: 0.0.0.0 #pkts encaps: 4, #pkts encrypt: 4, #pkts digest: 4 #pkts decaps: 4, #pkts decrypt: 4, #pkts verify: 4 #pkts compressed: 0, #pkts decompressed: 0 #pkts not compressed: 4, #pkts comp failed: 0, #pkts decomp failed: 0 #pre-frag successes: 0, #pre-frag failures: 0, #fragments created: 0 #PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0 #send errors: 0, #recv errors: 0 local crypto endpt.: 10.20.20.1, remote crypto endpt.: 10.10.10.1 path mtu 1500, ipsec overhead 58, media mtu 1500 current outbound spi: 4DC131C7 inbound esp sas: spi: 0x6F48BB47 (1867037511) transform: esp-des esp-md5-hmac none in use settings ={RA, Tunnel, } slot: 0, conn_id: 4096, crypto-map: myDYN-MAP sa timing: remaining key lifetime (sec): 28656 IV size: 8 bytes replay detection support: Y outbound esp sas: spi: 0x4DC131C7 (1304506823) transform: esp-des esp-md5-hmac none in use settings ={RA, Tunnel, } slot: 0, conn_id: 4096, crypto-map: myDYN-MAP sa timing: remaining key lifetime (sec): 28656 IV size: 8 bytes replay detection support: Y Crypto map tag: myDYN-MAP, seq num: 5, local addr: 10.20.20.1 local ident (addr/mask/prot/port): (172.22.1.0/255.255.255.0/0/0) remote ident (addr/mask/prot/port): (10.10.10.1/255.255.255.255/0/0) current_peer: 10.10.10.1, username: cisco dynamic allocated peer ip: 0.0.0.0 #pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0 #pkts decaps: 0, #pkts decrypt: 0, #pkts verify: 0 #pkts compressed: 0, #pkts decompressed: 0 #pkts not compressed: 0, #pkts comp failed: 0, #pkts decomp failed: 0 #pre-frag successes: 0, #pre-frag failures: 0, #fragments created: 0 #PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0 #send errors: 0, #recv errors: 0 local crypto endpt.: 10.20.20.1, remote crypto endpt.: 10.10.10.1 path mtu 1500, ipsec overhead 58, media mtu 1500 current outbound spi: DC1F63B2 inbound esp sas: spi: 0x5288CD4D (1384697165) transform: esp-des esp-md5-hmac none in use settings ={RA, Tunnel, } slot: 0, conn_id: 4096, crypto-map: myDYN-MAP sa timing: remaining key lifetime (sec): 28634 IV size: 8 bytes replay detection support: Y outbound esp sas: spi: 0xDC1F63B2 (3693044658) transform: esp-des esp-md5-hmac none in use settings ={RA, Tunnel, } slot: 0, conn_id: 4096, crypto-map: myDYN-MAP sa timing: remaining key lifetime (sec): 28634 IV size: 8 bytes replay detection support: Y Crypto map tag: myDYN-MAP, seq num: 5, local addr: 10.20.20.1 local ident (addr/mask/prot/port): (10.20.20.1/255.255.255.255/0/0) remote ident (addr/mask/prot/port): (10.10.10.1/255.255.255.255/0/0) current_peer: 10.10.10.1, username: cisco dynamic allocated peer ip: 0.0.0.0 #pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0 #pkts decaps: 0, #pkts decrypt: 0, #pkts verify: 0 #pkts compressed: 0, #pkts decompressed: 0 #pkts not compressed: 0, #pkts comp failed: 0, #pkts decomp failed: 0 #pre-frag successes: 0, #pre-frag failures: 0, #fragments created: 0 #PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0 #send errors: 0, #recv errors: 0 local crypto endpt.: 10.20.20.1, remote crypto endpt.: 10.10.10.1 path mtu 1500, ipsec overhead 58, media mtu 1500 current outbound spi: CADED9A2 inbound esp sas: spi: 0xD04E7073 (3494801523) transform: esp-des esp-md5-hmac none in use settings ={RA, Tunnel, } slot: 0, conn_id: 4096, crypto-map: myDYN-MAP sa timing: remaining key lifetime (sec): 28628 IV size: 8 bytes replay detection support: Y outbound esp sas: spi: 0xCADED9A2 (3403602338) transform: esp-des esp-md5-hmac none in use settings ={RA, Tunnel, } slot: 0, conn_id: 4096, crypto-map: myDYN-MAP sa timing: remaining key lifetime (sec): 28628 IV size: 8 bytes replay detection support: Y
PIX Easy VPN Remote Hardware Client show Commands and Sample Output
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vpnclient enable—This command enables an Easy VPN remote connection. In Network Extension Mode (NEM), the tunnel is up even when there is no interesting traffic to be exchanged with the headend Easy VPN server.
ciscoasa(config)#vpnclient enable
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show crypto isakmp sa—This command displays all current IKE SAs at a peer.
ciscoasa#show crypto isakmp sa Active SA: 1 Rekey SA: 0 (A tunnel will report 1 Active and 1 Rekey SA during rekey) Total IKE SA: 1 1 IKE Peer: 10.20.20.1 Type : user Role : initiator Rekey : no State : AM_ACTIVE -
show crypto ipsec sa—This command displays IPsec SAs built between peers.
ciscoasa#show crypto ipsec sa interface: outside Crypto map tag: _vpnc_cm, seq num: 10, local addr: 10.10.10.1 access-list _vpnc_acl permit ip 172.16.1.0 255.255.255.0 172.22.1.0 255.25 5.255.0 local ident (addr/mask/prot/port): (172.16.1.0/255.255.255.0/0/0) remote ident (addr/mask/prot/port): (172.22.1.0/255.255.255.0/0/0) current_peer: 10.20.20.1, username: 10.20.20.1 dynamic allocated peer ip: 0.0.0.0 #pkts encaps: 4, #pkts encrypt: 4, #pkts digest: 4 #pkts decaps: 4, #pkts decrypt: 4, #pkts verify: 4 #pkts compressed: 0, #pkts decompressed: 0 #pkts not compressed: 4, #pkts comp failed: 0, #pkts decomp failed: 0 #pre-frag successes: 0, #pre-frag failures: 0, #fragments created: 0 #PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0 #send errors: 0, #recv errors: 0 local crypto endpt.: 10.10.10.1, remote crypto endpt.: 10.20.20.1 path mtu 1500, ipsec overhead 58, media mtu 1500 current outbound spi: 6F48BB47 inbound esp sas: spi: 0x4DC131C7 (1304506823) transform: esp-des esp-md5-hmac none in use settings ={RA, Tunnel, } slot: 0, conn_id: 4096, crypto-map: _vpnc_cm sa timing: remaining key lifetime (sec): 28786 IV size: 8 bytes replay detection support: Y outbound esp sas: spi: 0x6F48BB47 (1867037511) transform: esp-des esp-md5-hmac none in use settings ={RA, Tunnel, } slot: 0, conn_id: 4096, crypto-map: _vpnc_cm sa timing: remaining key lifetime (sec): 28786 IV size: 8 bytes replay detection support: Y Crypto map tag: _vpnc_cm, seq num: 10, local addr: 10.10.10.1 access-list _vpnc_acl permit ip host 10.10.10.1 172.22.1.0 255.255.255.0 local ident (addr/mask/prot/port): (10.10.10.1/255.255.255.255/0/0) remote ident (addr/mask/prot/port): (172.22.1.0/255.255.255.0/0/0) current_peer: 10.20.20.1, username: 10.20.20.1 dynamic allocated peer ip: 0.0.0.0 #pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0 #pkts decaps: 0, #pkts decrypt: 0, #pkts verify: 0 #pkts compressed: 0, #pkts decompressed: 0 #pkts not compressed: 0, #pkts comp failed: 0, #pkts decomp failed: 0 #pre-frag successes: 0, #pre-frag failures: 0, #fragments created: 0 #PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0 #send errors: 0, #recv errors: 0 local crypto endpt.: 10.10.10.1, remote crypto endpt.: 10.20.20.1 path mtu 1500, ipsec overhead 58, media mtu 1500 current outbound spi: 5288CD4D inbound esp sas: spi: 0xDC1F63B2 (3693044658) transform: esp-des esp-md5-hmac none in use settings ={RA, Tunnel, } slot: 0, conn_id: 4096, crypto-map: _vpnc_cm sa timing: remaining key lifetime (sec): 28759 IV size: 8 bytes replay detection support: Y outbound esp sas: spi: 0x5288CD4D (1384697165) transform: esp-des esp-md5-hmac none in use settings ={RA, Tunnel, } slot: 0, conn_id: 4096, crypto-map: _vpnc_cm sa timing: remaining key lifetime (sec): 28759 IV size: 8 bytes replay detection support: Y Crypto map tag: _vpnc_cm, seq num: 10, local addr: 10.10.10.1 access-list _vpnc_acl permit ip host 10.10.10.1 host 10.20.20.1 local ident (addr/mask/prot/port): (10.10.10.1/255.255.255.255/0/0) remote ident (addr/mask/prot/port): (10.20.20.1/255.255.255.255/0/0) current_peer: 10.20.20.1, username: 10.20.20.1 dynamic allocated peer ip: 0.0.0.0 #pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0 #pkts decaps: 0, #pkts decrypt: 0, #pkts verify: 0 #pkts compressed: 0, #pkts decompressed: 0 #pkts not compressed: 0, #pkts comp failed: 0, #pkts decomp failed: 0 #pre-frag successes: 0, #pre-frag failures: 0, #fragments created: 0 #PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0 #send errors: 0, #recv errors: 0 local crypto endpt.: 10.10.10.1, remote crypto endpt.: 10.20.20.1 path mtu 1500, ipsec overhead 58, media mtu 1500 current outbound spi: D04E7073 inbound esp sas: spi: 0xCADED9A2 (3403602338) transform: esp-des esp-md5-hmac none in use settings ={RA, Tunnel, } slot: 0, conn_id: 4096, crypto-map: _vpnc_cm sa timing: remaining key lifetime (sec): 28752 IV size: 8 bytes replay detection support: Y outbound esp sas: spi: 0xD04E7073 (3494801523) transform: esp-des esp-md5-hmac none in use settings ={RA, Tunnel, } slot: 0, conn_id: 4096, crypto-map: _vpnc_cm sa timing: remaining key lifetime (sec): 28752 IV size: 8 bytes replay detection support: Y -
show vpnclient—This command displays VPN Client or Easy VPN remote device configuration information.
ciscoasa#show vpnclient LOCAL CONFIGURATION vpnclient server 10.20.20.1 vpnclient mode network-extension-mode vpnclient vpngroup mytunnel password ******** vpnclient username cisco password ******** vpnclient enable DOWNLOADED DYNAMIC POLICY Current Server : 10.20.20.1 PFS Enabled : No Secure Unit Authentication Enabled : No User Authentication Enabled : No Split Tunnel Networks : 172.22.1.0/255.255.255.0 Backup Servers : None
Troubleshoot
This section provides information you can use to troubleshoot your configuration.
If you have set up the Easy VPN remote hardware client and Easy VPN server as this document describes and you still experience problems, gather the debug output from each PIX and the output from the show commands for analysis by Cisco Technical Support. Refer to Troubleshooting the PIX to Pass Data Traffic on an Established IPSec Tunnel and IP Security Troubleshooting - Understanding and Using debug Commands for more information. Enable IPsec debugging on the PIX.
These sections display PIX debug commands and sample output.
The Output Interpreter Tool (registered customers only) (OIT) supports certain show commands. Use the OIT in order to view an analysis of show command output.
Note: Refer to Important Information on Debug Commands before you use debug commands.
Easy VPN Server Commands
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debug crypto ipsec—This command displays the IPsec negotiations of Phase 2.
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debug crypto isakmp—This command displays the ISAKMP negotiations of Phase 1.
This is a sample of the output:
pixfirewall#debug crypto isakmp 2 Aug 08 03:26:09 [IKEv1]: IP = 10.10.10.1, Connection lan ded on tunnel_group mytunnel Aug 08 03:26:09 [IKEv1]: Group = mytunnel, Username = cisco, IP = 10.10.10.1, Us er (cisco) authenticated. Aug 08 03:26:09 [IKEv1]: Group = mytunnel, Username = cisco, IP = 10.10.10.1, PH ASE 1 COMPLETED Aug 08 03:26:09 [IKEv1]: Group = mytunnel, Username = cisco, IP = 10.10.10.1, IK E: requesting SPI! Aug 08 03:26:09 [IKEv1]: Group = mytunnel, Username = cisco, IP = 10.10.10.1, Se curity negotiation complete for User (cisco) Responder, Inbound SPI = 0xe6b089b 7, Outbound SPI = 0xcb705206
Easy VPN Remote Hardware Client Commands
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debug crypto ipsec—This command displays the IPsec negotiations of Phase 2.
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debug crypto isakmp—This command displays the ISAKMP negotiations of Phase 1.
ciscoasa#debug crypto isakmp 2 Aug 08 14:16:09 [IKEv1]: IP = 10.20.20.1, Connection landed on tunnel_group 10.20.20.1 Aug 08 14:16:09 [IKEv1]: IP = 10.20.20.1, Received encrypted packet with no matc hing SA, dropping Aug 08 14:16:09 [IKEv1]: IP = 10.20.20.1, Received encrypted packet with no matc hing SA, dropping Aug 08 14:16:09 [IKEv1]: IP = 10.20.20.1, Received encrypted packet with no matc hing SA, dropping Aug 08 14:16:10 [IKEv1]: Group = 10.20.20.1, IP = 10.20.20.1, PHASE 1 COMPLETED Aug 08 14:16:10 [IKEv1]: Group = 10.20.20.1, IP = 10.20.20.1, Security negotiati on complete for peer (10.20.20.1) Initiator, Inbound SPI = 0xcb705206, Outbound SPI = 0xe6b089b7 Aug 08 14:16:10 [IKEv1]: Group = 10.20.20.1, IP = 10.20.20.1, PHASE 2 COMPLETED (msgid=670ff816) Aug 08 14:16:10 [IKEv1]: Group = 10.20.20.1, IP = 10.20.20.1, IKE Initiator: New Phase 2, Intf inside, IKE Peer 10.20.20.1 local Proxy Address 172.16.1.0, remo te Proxy Address 172.22.1.0, Crypto map (_vpnc_cm) Aug 08 14:16:10 [IKEv1]: Group = 10.20.20.1, IP = 10.20.20.1, Security negotiati on complete for peer (10.20.20.1) Initiator, Inbound SPI = 0x3bfa93fb, Outbound SPI = 0x3b11bf8b Aug 08 14:16:10 [IKEv1]: Group = 10.20.20.1, IP = 10.20.20.1, PHASE 2 COMPLETED (msgid=29791739) Aug 08 14:16:13 [IKEv1]: Group = 10.20.20.1, IP = 10.20.20.1, IKE Initiator: New Phase 2, Intf NP Identity Ifc, IKE Peer 10.20.20.1 local Proxy Address 10.10.1 0.1, remote Proxy Address 172.22.1.0, Crypto map (_vpnc_cm) Aug 08 14:16:13 [IKEv1]: Group = 10.20.20.1, IP = 10.20.20.1, Security negotiati on complete for peer (10.20.20.1) Initiator, Inbound SPI = 0xd329cacc, Outbound SPI = 0xdec3c1b6 Aug 08 14:16:13 [IKEv1]: Group = 10.20.20.1, IP = 10.20.20.1, PHASE 2 COMPLETED (msgid=b303dbac) Aug 08 03:26:09 [IKEv1]: Group = mytunnel, Username = cisco, IP = 10.10.10.1, PH ASE 2 COMPLETED (msgid=670ff816) Aug 08 03:26:10 [IKEv1]: Group = mytunnel, Username = cisco, IP = 10.10.10.1, IK E: requesting SPI! Aug 08 03:26:10 [IKEv1]: Group = mytunnel, Username = cisco, IP = 10.10.10.1, Se curity negotiation complete for User (cisco) Responder, Inbound SPI = 0x3b11bf8 b, Outbound SPI = 0x3bfa93fb Aug 08 03:26:10 [IKEv1]: Group = mytunnel, Username = cisco, IP = 10.10.10.1, PH ASE 2 COMPLETED (msgid=29791739) Aug 08 03:26:12 [IKEv1]: Group = mytunnel, Username = cisco, IP = 10.10.10.1, IK E: requesting SPI! Aug 08 03:26:12 [IKEv1]: Group = mytunnel, Username = cisco, IP = 10.10.10.1, Se curity negotiation complete for User (cisco) Responder, Inbound SPI = 0xdec3c1b 6, Outbound SPI = 0xd329cacc Aug 08 03:26:12 [IKEv1]: Group = mytunnel, Username = cisco, IP = 10.10.10.1, PH ASE 2 COMPLETED (msgid=b303dbac)
Related Information
- Cisco PIX 500 Series Security Appliances
- Cisco ASA 5500 Series Adaptive Security Appliances
- Cisco PIX Firewall Software
- Cisco Secure PIX Firewall Command References
- Security Product Field Notices (including PIX)
-
Requests for
Comments (RFCs)
- IPsec Negotiation/IKE Protocols
- Technical Support & Documentation - Cisco Systems
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