Esta configuración permite que las redes privadas detrás de tres cajas Cisco Secure PIX Firewall se conecten por túneles VPN a través de Internet o cualquier red pública que utilice IPsec. Cada una de las tres redes tiene conectividad con las otras dos. En esta situación, la traducción de direcciones de red (NAT) es necesaria para las conexiones a la Internet pública. Sin embargo, NAT no es necesaria para el tráfico entre las tres intranets, que se puede transmitir mediante un túnel VPN a través de la Internet pública.
Para que IPsec funcione, debe tener conectividad desde el punto final del túnel al punto final del túnel antes de comenzar esta configuración.
Esta configuración fue desarrollada y probada con la versión 6.1(2) del Firewall PIX.
Nota: El comando show version debe mostrar que el cifrado está habilitado.
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.
Consulte Convenciones de Consejos Técnicos de Cisco para obtener más información sobre las convenciones sobre documentos.
En esta sección encontrará la información para configurar las funciones descritas en este documento.
Nota: Utilice la herramienta Command Lookup (sólo para clientes registrados) para obtener más información sobre los comandos utilizados en esta sección.
En este documento, se utiliza esta configuración de red:
En este documento, se utilizan estas configuraciones:
Configuración de PIX 1 |
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PIX Version 6.1(2) nameif ethernet0 outside security0 nameif ethernet1 inside security100 enable password 8Ry2YjIyt7RRXU24 encrypted passwd 2KFQnbNIdI.2KYOU encrypted hostname pix_1 fixup protocol ftp 21 fixup protocol http 80 fixup protocol h323 1720 fixup protocol rsh 514 fixup protocol smtp 25 fixup protocol sqlnet 1521 fixup protocol sip 5060 names !--- Traffic to PIX 2 private network: access-list 120 permit ip 10.1.1.0 255.255.255.0 10.2.2.0 255.255.255.0 !--- Traffic to PIX 3 private network: access-list 130 permit ip 10.1.1.0 255.255.255.0 10.3.3.0 255.255.255.0 !--- Do not perform NAT for traffic to !--- other PIX Firewall private networks: access-list 100 permit ip 10.1.1.0 255.255.255.0 10.2.2.0 255.255.255.0 access-list 100 permit ip 10.1.1.0 255.255.255.0 10.3.3.0 255.255.255.0 pager lines 24 logging on no logging timestamp no logging standby no logging console no logging monitor no logging buffered no logging trap no logging history logging facility 20 logging queue 512 interface ethernet0 auto interface ethernet1 auto mtu outside 1500 mtu inside 1500 ip address outside 172.18.124.153 255.255.255.0 ip address inside 10.1.1.1 255.255.255.0 ip audit info action alarm ip audit attack action alarm no failover failover timeout 0:00:00 failover poll 15 failover ip address outside 0.0.0.0 failover ip address inside 0.0.0.0 arp timeout 14400 !--- Do not perform NAT for traffic to other PIX Firewalls: nat (inside) 0 access-list 100 route outside 0.0.0.0 0.0.0.0 172.18.124.1 1 timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h323 0:05:00 sip 0:30:00 sip_media 0:02:00 timeout uauth 0:05:00 absolute aaa-server TACACS+ protocol tacacs+ aaa-server RADIUS protocol radius no snmp-server location no snmp-server contact snmp-server community public snmp-server enable traps floodguard enable sysopt connection permit-ipsec no sysopt route dnat crypto ipsec transform-set myset esp-des esp-md5-hmac !--- IPsec configuration for tunnel to PIX 2: crypto map newmap 20 ipsec-isakmp crypto map newmap 20 match address 120 crypto map newmap 20 set peer 172.18.124.154 crypto map newmap 20 set transform-set myset !--- IPsec configuration for tunnel to PIX 3: crypto map newmap 30 ipsec-isakmp crypto map newmap 30 match address 130 crypto map newmap 30 set peer 172.18.124.157 crypto map newmap 30 set transform-set myset crypto map newmap interface outside isakmp enable outside isakmp key ******** address 172.18.124.154 netmask 255.255.255.255 no-xauth no-config-mode isakmp key ******** address 172.18.124.157 netmask 255.255.255.255 no-xauth no-config-mode isakmp identity address isakmp policy 10 authentication pre-share isakmp policy 10 encryption des isakmp policy 10 hash md5 isakmp policy 10 group 1 isakmp policy 10 lifetime 1000 telnet timeout 5 ssh timeout 5 terminal width 80 Cryptochecksum:436c96500052d0276324b9ef33221b2d : end [OK] |
Configuración de PIX 2 |
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PIX Version 6.1(2) nameif ethernet0 outside security0 nameif ethernet1 inside security100 enable password 8Ry2YjIyt7RRXU24 encrypted passwd 2KFQnbNIdI.2KYOU encrypted hostname pix_2 fixup protocol ftp 21 fixup protocol http 80 fixup protocol h323 1720 fixup protocol rsh 514 fixup protocol smtp 25 fixup protocol sqlnet 1521 fixup protocol sip 5060 names !--- Traffic to PIX 1: access-list 110 permit ip 10.2.2.0 255.255.255.0 10.1.1.0 255.255.255.0 !--- Traffic to PIX 3: access-list 130 permit ip 10.2.2.0 255.255.255.0 10.3.3.0 255.255.255.0 !--- Do not perform NAT for traffic to other PIX Firewalls: access-list 100 permit ip 10.2.2.0 255.255.255.0 10.1.1.0 255.255.255.0 access-list 100 permit ip 10.2.2.0 255.255.255.0 10.3.3.0 255.255.255.0 pager lines 24 logging on no logging timestamp no logging standby no logging console no logging monitor no logging buffered no logging trap no logging history logging facility 20 logging queue 512 interface ethernet0 auto interface ethernet1 auto mtu outside 1500 mtu inside 1500 ip address outside 172.18.124.154 255.255.255.0 ip address inside 10.2.2.1 255.255.255.0 ip audit info action alarm ip audit attack action alarm no failover failover timeout 0:00:00 failover poll 15 failover ip address outside 0.0.0.0 failover ip address inside 0.0.0.0 arp timeout 14400 !--- Do not perform NAT for traffic to other PIX Firewalls: nat (inside) 0 access-list 100 route outside 0.0.0.0 0.0.0.0 172.18.124.1 1 timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h323 0:05:00 sip 0:30:00 sip_media 0:02:00 timeout uauth 0:05:00 absolute aaa-server TACACS+ protocol tacacs+ aaa-server RADIUS protocol radius no snmp-server location no snmp-server contact snmp-server community public no snmp-server enable traps floodguard enable sysopt connection permit-ipsec no sysopt route dnat crypto ipsec transform-set myset esp-des esp-md5-hmac !--- IPsec configuration for tunnel to PIX 1: crypto map newmap 10 ipsec-isakmp crypto map newmap 10 match address 110 crypto map newmap 10 set peer 172.18.124.153 crypto map newmap 10 set transform-set myset !--- IPsec configuration for tunnel to PIX 3: crypto map newmap 30 ipsec-isakmp crypto map newmap 30 match address 130 crypto map newmap 30 set peer 172.18.124.157 crypto map newmap 30 set transform-set myset crypto map newmap interface outside isakmp enable outside isakmp key ******** address 172.18.124.153 netmask 255.255.255.255 no-xauth no-config-mode isakmp key ******** address 172.18.124.157 netmask 255.255.255.255 no-xauth no-config-mode isakmp identity address isakmp policy 10 authentication pre-share isakmp policy 10 encryption des isakmp policy 10 hash md5 isakmp policy 10 group 1 isakmp policy 10 lifetime 1000 telnet timeout 5 ssh timeout 5 terminal width 80 Cryptochecksum:aef12453a0ea29b592dd0d395de881f5 : end |
Configuración de PIX 3 |
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PIX Version 6.1(2) nameif ethernet0 outside security0 nameif ethernet1 inside security100 enable password 8Ry2YjIyt7RRXU24 encrypted passwd 2KFQnbNIdI.2KYOU encrypted hostname pix_3 fixup protocol ftp 21 fixup protocol http 80 fixup protocol h323 1720 fixup protocol rsh 514 fixup protocol smtp 25 fixup protocol sqlnet 1521 fixup protocol sip 5060 names !--- IPsec configuration for tunnel to PIX 1: access-list 110 permit ip 10.3.3.0 255.255.255.0 10.1.1.0 255.255.255.0 !--- IPsec configuration for tunnel to PIX 2: access-list 120 permit ip 10.3.3.0 255.255.255.0 10.2.2.0 255.255.255.0 !--- Do not perform NAT for traffic to other PIX Firewalls: access-list 100 permit ip 10.3.3.0 255.255.255.0 10.2.2.0 255.255.255.0 access-list 100 permit ip 10.3.3.0 255.255.255.0 10.1.1.0 255.255.255.0 pager lines 24 logging on no logging timestamp no logging standby no logging console no logging monitor no logging buffered no logging trap no logging history logging facility 20 logging queue 512 interface ethernet0 auto interface ethernet1 auto mtu outside 1500 mtu inside 1500 ip address outside 172.18.124.157 255.255.255.0 ip address inside 10.3.3.1 255.255.255.0 ip audit info action alarm ip audit attack action alarm no failover failover timeout 0:00:00 failover poll 15 failover ip address outside 0.0.0.0 failover ip address inside 0.0.0.0 arp timeout 14400 !--- Do not perform NAT for traffic to other PIX Firewalls: nat (inside) 0 access-list 100 route outside 0.0.0.0 0.0.0.0 172.18.124.1 1 timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h323 0:05:00 sip 0:30:00 sip_media 0:02:00 timeout uauth 0:05:00 absolute aaa-server TACACS+ protocol tacacs+ aaa-server RADIUS protocol radius no snmp-server location no snmp-server contact snmp-server community public no snmp-server enable traps floodguard enable sysopt connection permit-ipsec no sysopt route dnat crypto ipsec transform-set myset esp-des esp-md5-hmac !--- IPsec configuration for tunnel to PIX 1: crypto map newmap 10 ipsec-isakmp crypto map newmap 10 match address 110 crypto map newmap 10 set peer 172.18.124.153 crypto map newmap 10 set transform-set myset !--- IPsec configuration for tunnel to PIX 2: crypto map newmap 20 ipsec-isakmp crypto map newmap 20 match address 120 crypto map newmap 20 set peer 172.18.124.154 crypto map newmap 20 set transform-set myset crypto map newmap interface outside isakmp enable outside isakmp key ******** address 172.18.124.153 netmask 255.255.255.255 no-xauth no-config-mode isakmp key ******** address 172.18.124.154 netmask 255.255.255.255 no-xauth no-config-mode isakmp identity address isakmp policy 10 authentication pre-share isakmp policy 10 encryption des isakmp policy 10 hash md5 isakmp policy 10 group 1 isakmp policy 10 lifetime 1000 telnet timeout 5 ssh timeout 5 terminal width 80 Cryptochecksum:e6ad75852dff21efdb2d24cc95ffbe1c : end [OK] |
Actualmente, no hay un procedimiento de verificación disponible para esta configuración.
En esta sección encontrará información que puede utilizar para solucionar problemas de configuración. Refiérase a Troubleshooting de PIX para Pasar el Tráfico de Datos en un Túnel IPsec Establecido para obtener más información.
Nota: Consulte Información Importante sobre Comandos Debug antes de utilizar los comandos debug.
Comandos de Debug
Utilice estos comandos en el PIX, con los comandos logging monitor debugging o logging console debugging que se ejecutan.
debug crypto ipsec: Depura el procesamiento IPsec.
debug crypto isakmp: depura el procesamiento de la Asociación de seguridad de Internet y del protocolo de administración de claves (ISAKMP).
debug crypto engine: muestra los mensajes de depuración sobre los motores criptográficos, que realizan el cifrado y el descifrado.
Comandos clear
Para borrar las asociaciones de seguridad (SA), utilice estos comandos en el modo de configuración del PIX.
clear [crypto] ipsec sa: elimina las SAs IPsec activas. La palabra clave crypto es opcional.
clear [crypto] isakmp sa: elimina las SA de Intercambio de claves de Internet (IKE) activas. La palabra clave crypto es opcional.
Nota: Para que IPsec funcione, debe tener conectividad desde el punto final del túnel al punto final del túnel antes de comenzar esta configuración.
Revisión | Fecha de publicación | Comentarios |
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1.0 |
30-Sep-2008 |
Versión inicial |