Esta configuración permite que un Cisco Secure PIX Firewall central se comunique con las redes detrás de otras dos cajas PIX Firewall a través de túneles VPN a través de Internet o cualquier red pública que utilice IPsec. Las dos redes periféricas no necesitan comunicarse entre sí, pero hay conectividad a la red central. Las dos redes de salida no pueden comunicarse entre sí atravesando el PIX central porque el PIX no rutea el tráfico recibido en una interfaz de regreso a la misma interfaz. Si hay necesidad de que las redes externas se comuniquen entre sí, necesita una configuración de malla completa, en lugar de la configuración de hub y spoke que se muestra en este documento. Puede que ya haya declaraciones nat 1, global, static y conduit presentes en los PIX. Este ejemplo sólo muestra la adición de cifrado.
Para que IPsec funcione, debe establecer la conectividad entre los puntos finales del túnel antes de iniciar esta configuración.
La información en este documento se basa en las versiones 5.1.x, 5.2.x y 6.3.3 de PIX Firewall.
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:
Central PIX |
---|
Building configuration... : Saved : PIX Version 6.3(3) interface ethernet0 auto interface ethernet1 auto nameif ethernet0 outside security0 nameif ethernet1 inside security100 enable password 8Ry2YjIyt7RRXU24 encrypted passwd 2KFQnbNIdI.2KYOU encrypted hostname pix-central fixup protocol dns maximum-length 512 fixup protocol ftp 21 fixup protocol h323 h225 1720 fixup protocol h323 ras 1718-1719 fixup protocol http 80 fixup protocol rsh 514 fixup protocol rtsp 554 fixup protocol sip 5060 fixup protocol sip udp 5060 fixup protocol skinny 2000 fixup protocol smtp 25 fixup protocol sqlnet 1521 fixup protocol tftp 69 names !--- This is traffic to PIX 2. access-list 120 permit ip 10.1.1.0 255.255.255.0 10.2.2.0 255.255.255.0 !--- This is traffic to PIX 3. access-list 130 permit ip 10.1.1.0 255.255.255.0 10.3.3.0 255.255.255.0 !--- Do not do Network Address Translation (NAT) on traffic to other PIXes. 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 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 pdm history enable arp timeout 14400 !--- Do not do NAT on traffic to other PIXes. 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 h225 1:00:00 timeout h323 0:05:00 mgcp 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 aaa-server LOCAL protocol local no snmp-server location no snmp-server contact snmp-server community public snmp-server enable traps floodguard enable sysopt connection permit-ipsec crypto ipsec transform-set myset esp-des esp-md5-hmac !--- This is traffic 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 !--- This is traffic 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 console timeout 0 terminal width 80 Cryptochecksum:d41d8cd98f00b204e9800998ecf8427e : end |
PIX 2 |
---|
Building configuration... : Saved : PIX Version 6.3(3) interface ethernet0 auto interface ethernet1 auto nameif ethernet0 outside security0 nameif ethernet1 inside security100 enable password 8Ry2YjIyt7RRXU24 encrypted passwd 2KFQnbNIdI.2KYOU encrypted hostname pix2 fixup protocol dns maximum-length 512 fixup protocol ftp 21 fixup protocol h323 h225 1720 fixup protocol h323 ras 1718-1719 fixup protocol http 80 fixup protocol rsh 514 fixup protocol rtsp 554 fixup protocol sip 5060 fixup protocol sip udp 5060 fixup protocol skinny 2000 fixup protocol smtp 25 fixup protocol sqlnet 1521 fixup protocol tftp 69 names !--- This is traffic to PIX Central. access-list 110 permit ip 10.2.2.0 255.255.255.0 10.1.1.0 255.255.255.0 !--- Do not do NAT on traffic to PIX Central. access-list 100 permit ip 10.2.2.0 255.255.255.0 10.1.1.0 255.255.255.0 pager lines 24 logging on 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 no failover ip address outside no failover ip address inside pdm history enable arp timeout 14400 !--- Do not do NAT on traffic to PIX Central. 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 h225 1:00:00 timeout h323 0:05:00 mgcp 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 aaa-server LOCAL protocol local no snmp-server location no snmp-server contact snmp-server community public no snmp-server enable traps floodguard enable sysopt connection permit-ipsec crypto ipsec transform-set myset esp-des esp-md5-hmac !--- This is traffic to PIX Central. 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 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 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 console timeout 0 terminal width 80 Cryptochecksum:d41d8cd98f00b204e9800998ecf8427e : end |
PIX 3 |
---|
Building configuration... : Saved : PIX Version 6.3(3) interface ethernet0 auto interface ethernet1 auto nameif ethernet0 outside security0 nameif ethernet1 inside security100 enable password 8Ry2YjIyt7RRXU24 encrypted passwd 2KFQnbNIdI.2KYOU encrypted hostname pix3 fixup protocol dns maximum-length 512 fixup protocol ftp 21 fixup protocol h323 h225 1720 fixup protocol h323 ras 1718-1719 fixup protocol http 80 fixup protocol rsh 514 fixup protocol rtsp 554 fixup protocol sip 5060 fixup protocol sip udp 5060 fixup protocol skinny 2000 fixup protocol smtp 25 fixup protocol sqlnet 1521 fixup protocol tftp 69 names !--- This is traffic to PIX Central. access-list 110 permit ip 10.3.3.0 255.255.255.0 10.1.1.0 255.255.255.0 !--- Do not do NAT on traffic to PIX Central. 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 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 no failover ip address outside no failover ip address inside pdm history enable arp timeout 14400 !--- Do not do NAT on traffic to PIX Central. 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 h225 1:00:00 timeout h323 0:05:00 mgcp 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 aaa-server LOCAL protocol local no snmp-server location no snmp-server contact snmp-server community public no snmp-server enable traps floodguard enable sysopt connection permit-ipsec crypto ipsec transform-set myset esp-des esp-md5-hmac !--- This is traffic to PIX Central. 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 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 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 console timeout 0 terminal width 80 Cryptochecksum:aa3bbd8c6275d214b153e1e0bc0173e4 : end |
Use esta sección para confirmar que su configuración funciona correctamente.
La herramienta Output Interpreter Tool (clientes registrados solamente) (OIT) soporta ciertos comandos show. Utilice la OIT para ver un análisis del resultado del comando show.
show crypto ipsec sa: muestra el estado actual de las asociaciones de seguridad IPsec (SA) y es útil para determinar si el tráfico está cifrado.
pix-central#show crypto ipsec sa interface: outside Crypto map tag: newmap, local addr. 172.18.124.153 local ident (addr/mask/prot/port): (10.1.1.0/255.255.255.0/0/0) remote ident (addr/mask/prot/port): (10.3.3.0/255.255.255.0/0/0) current_peer: 172.18.124.157:500 PERMIT, flags={origin_is_acl,} !--- This verifies that encrypted packets are sent !--- and received without any errors. #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: 0, #pkts compr. failed: 0, #pkts decompress failed: 0, #send errors 0, #recv errors 0 local crypto endpt.: 172.18.124.153, remote crypto endpt.: 172.18.124.157 path mtu 1500, ipsec overhead 56, media mtu 1500 current outbound spi: 3bcb6913 !--- Shows inbound SAs that are established. inbound esp sas: spi: 0x3efbe540(1056695616) transform: esp-des esp-md5-hmac , in use settings ={Tunnel, } slot: 0, conn id: 3, crypto map: newmap sa timing: remaining key lifetime (k/sec): (4607999/27330) IV size: 8 bytes replay detection support: Y inbound ah sas: inbound pcp sas: !--- Shows outbound SAs that are established. outbound esp sas: spi: 0x3bcb6913(1003186451) transform: esp-des esp-md5-hmac , in use settings ={Tunnel, } slot: 0, conn id: 4, crypto map: newmap sa timing: remaining key lifetime (k/sec): (4607999/27321) IV size: 8 bytes replay detection support: Y outbound ah sas: outbound pcp sas: local ident (addr/mask/prot/port): (10.1.1.0/255.255.255.0/0/0) remote ident (addr/mask/prot/port): (10.2.2.0/255.255.255.0/0/0) current_peer: 172.18.124.154:500 PERMIT, flags={origin_is_acl,} !--- This verifies that encrypted packets are sent !--- and received without any errors. #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: 0, #pkts compr. failed: 0, #pkts decompress failed: 0, #send errors 0, #recv errors 0 local crypto endpt.: 172.18.124.153, remote crypto endpt.: 172.18.124.154 path mtu 1500, ipsec overhead 56, media mtu 1500 current outbound spi: da8d556 !--- Shows inbound SAs that are established. inbound esp sas: spi: 0x53835c96(1401117846) transform: esp-des esp-md5-hmac , in use settings ={Tunnel, } slot: 0, conn id: 1, crypto map: newmap sa timing: remaining key lifetime (k/sec): (4607999/27319) IV size: 8 bytes replay detection support: Y inbound ah sas: inbound pcp sas: !--- Shows outbound SAs that are established. outbound esp sas: spi: 0xda8d556c(3666695532) transform: esp-des esp-md5-hmac , in use settings ={Tunnel, } slot: 0, conn id: 2, crypto map: newmap sa timing: remaining key lifetime (k/sec): (4607999/27319) IV size: 8 bytes replay detection support: Y outbound ah sas: outbound pcp sas:
show crypto isakmp sa: muestra el estado actual de las SA de Intercambio de claves de Internet (IKE).
pix-central#show crypto isakmp sa Total : 2 Embryonic : 0 dst src state pending created 172.18.124.153 172.18.124.154 QM_IDLE 0 0 172.18.124.153 172.18.124.157 QM_IDLE 0 0
En esta sección encontrará información que puede utilizar para solucionar problemas de configuración.
Nota: Consulte Información Importante sobre Comandos Debug antes de utilizar los comandos debug.
En el PIX (con los comandos logging monitor debugging o logging console debugging ejecutándose):
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.
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 IKE activas. La palabra clave crypto es opcional.
Revisión | Fecha de publicación | Comentarios |
---|---|---|
1.0 |
15-Jun-2006 |
Versión inicial |