Configurando o GRE no IPSec entre um roteador Cisco IOS e um concentrador VPN 5000, usando RIP e CVC
Contents
Introdução
Este exemplo de configuração descreve como configurar o Generic Routing Encapsulation (GRE) sobre IPSec entre um Cisco VPN 5000 Concentrator e um roteador Cisco IOS®. O recurso GRE sobre IPSec foi incorporado no release do software VPN 5000 Concentrator 6.0(19).
O Routing Information Protocol (RIP) é usado como o protocolo de roteamento dinâmico nesta amostra para rotear o tráfego pelo túnel VPN.
Pré-requisitos
Requisitos
Não existem requisitos específicos para este documento.
Componentes Utilizados
As informações neste documento são baseadas nestas versões de software e hardware:
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Software Cisco IOS versão 12.1(5)T7
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Software VPN 5000 Concentrator versão 6.0(19)
As informações neste documento foram criadas a partir de dispositivos em um ambiente de laboratório específico. Todos os dispositivos utilizados neste documento foram iniciados com uma configuração (padrão) inicial. Se a sua rede estiver ativa, certifique-se de que entende o impacto potencial de qualquer comando.
Conventions
Para obter mais informações sobre convenções de documento, consulte as Convenções de dicas técnicas Cisco.
Configurar
Nesta seção, você encontrará informações para configurar os recursos descritos neste documento.
Observação: para encontrar informações adicionais sobre os comandos usados neste documento, use a ferramenta Command Lookup Tool (somente clientes registrados).
Diagrama de Rede
Este documento utiliza a configuração de rede mostrada neste diagrama.
O GRE sobre IPSec é configurado entre o roteador Cisco IOS (7140) e o Cisco VPN 5008 Concentrator. Por trás desses dispositivos, várias redes são anunciadas via RIP, que é executado dentro do túnel GRE entre 7140 e VPN 5008.
As redes por trás do Cisco 7140 são:
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10.31.0.0/17
As redes por trás do VPN 5008 são:
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172.18.124.0.0/24
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20.20.20.0/24
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10.0.0.0/24
Configurações
Este documento utiliza as configurações mostradas aqui.
| Cisco IOS Router |
|---|
Building configuration... Current configuration : 1607 bytes ! version 12.1 no service single-slot-reload-enable service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname 03-vpn-7140 ! boot system flash disk1:c7100-ik8s-mz.122-3 logging rate-limit console 10 except errors enable password <removed> ! ip subnet-zero ip cef ! ! no ip finger ! ! !--- Define phase 1 policy. crypto isakmp policy 10 authentication pre-share !--- Define the PreShared Key for the Remote peer !--- (5000 ) in this example. crypto isakmp key cisco123 address 10.32.1.161 ! !--- Define Phase 2 policy. !--- Make sure that Transport Mode is enabled. crypto ipsec transform-set www esp-des esp-sha-hmac mode transport ! !--- Define the crypto map that is later !--- applied on the outbound interface. crypto map temp 10 ipsec-isakmp set peer 10.32.1.161 set transform-set www match address 100 ! call rsvp-sync ! ! ! ! ! ! ! controller ISA 5/1 ! !--- Define the GRE tunnel on the router. !--- Tunnel source is the outbound interface !--- and tunnel destination is VPN 5000. interface Tunnel0 ip address 10.1.1.2 255.255.255.0 tunnel source FastEthernet0/0 tunnel destination 10.32.1.161 crypto map temp ! !--- Outbound Interface that is connected to the Internet. interface FastEthernet0/0 ip address 10.32.1.162 255.255.128.0 duplex auto speed auto crypto map temp ! ! !--- Inside interface. interface FastEthernet0/1 ip address 10.31.100.1 255.255.128.0 no keepalive duplex auto speed auto ! interface Serial1/0 no ip address shutdown framing c-bit cablelength 10 dsu bandwidth 44210 ! interface Serial1/1 no ip address shutdown framing c-bit cablelength 10 dsu bandwidth 44210 ! !--- Define RIP Routing Protocol on the router. !--- This example shows Version 2 for classless routing. router rip version 2 network 10.0.0.0 no auto-summary ! ip classless ip route 0.0.0.0 0.0.0.0 10.32.1.1 no ip http server ! !--- Encryption access-list that is used !--- to encrypt the GRE packets. access-list 100 permit gre host 10.32.1.162 host 10.32.1.161 ! ! line con 0 exec-timeout 0 0 transport input none line aux 0 line vty 5 15 ! end |
| VPN 5000 Concentrator |
|---|
show configuration Edited Configuration not Present, using Running [ IP Ethernet 0:0 ] SubnetMask = 255.255.255.0 IPAddress = 1.1.1.1 [ IP Ethernet 1:0 ]Mode = Routed SubnetMask = 255.255.128.0 IPAddress = 10.32.1.161 [ General ] VPNGateway = 10.32.1.1 EnablePassword = <removed> Password = <removed> EthernetAddress = 00:00:a5:e9:c8:00 DeviceType = VPN 5002/8 Concentrator ConfiguredOn = Timeserver not configured ConfiguredFrom = Command Line, from Console [ IKE Policy ] Protection = SHA_DES_G1 [ IP Static ] 0.0.0.0 0.0.0.0 10.32.1.1 1 redist=none [ Context List ] flash://rip.cfg [ Logging ] Enabled = On Level = 7 Configuration size is 822 out of 65500 bytes. VPN5002_8_A5E9C800: Main# |
| CVC |
|---|
show configuration Edited Configuration not Present, using Running [ General ] Context = "rip" [ IP Ethernet 1:0.1 ] VLANID = 124 Encapsulation = dot1q Mode = Routed SubnetMask = 255.255.255.0 IPAddress = 172.18.124.219 [ IP Static ] [ Tunnel Partner VPN 1 ] InactivityTimeout = 120 Transform = esp(sha,des) KeyManage = ReliablePeer = "10.31.0.0/17" LocalAccess = "10.5.1.0/24" SharedKey = "cisco123" Mode = Main TunnelType = GREinIPSec BindTo = "Ethernet 1:0" Partner = 10.32.1.162 [ IP VPN 1 ] RIPIn = On RIPOut = On RIPVersion = V2 DirectedBroadcast = Off Numbered = On Mode = Routed SubnetMask = 255.255.255.0 IPAddress = 10.1.1.1 [ IP Ethernet 1:0.2 ] Mode = Routed SubnetMask = 255.255.255.0 IPAddress = 20.20.20.20 Configuration size is 1127 out of 65500 bytes. VPN5002_8_A5E9C800: rip# |
Verificar
Esta seção fornece informações que você pode usar para confirmar se sua configuração está funcionando adequadamente.
A Output Interpreter Tool (somente clientes registrados) oferece suporte a determinados comandos show, o que permite exibir uma análise da saída do comando show.
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show ip route — Mostra o estado atual da tabela de roteamento.
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show crypto engine connection ative — Mostra o contador de criptografia/descriptografia de pacotes por associação de segurança IPSec.
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show crypto ipsec sa — Mostra todas as associações de segurança IPSec atuais.
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show system log buffer — Mostra informações básicas do syslog.
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vpn trace dump — Mostra informações detalhadas sobre processos VPN.
03-vpn-7140#show ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is 10.32.1.1 to network 0.0.0.0 20.0.0.0/24 is subnetted, 1 subnets R 20.20.20.0 [120/1] via 10.1.1.1, 00:00:10, Tunnel0 172.18.0.0/16 is variably subnetted, 2 subnets, 2 masks R 172.18.124.0/24 [120/1] via 10.1.1.1, 00:00:10, Tunnel0 10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks R 10.0.0.0/24 [120/2] via 10.1.1.1, 00:00:10, Tunnel0 C 10.1.1.0/24 is directly connected, Tunnel0 C 10.31.0.0/17 is directly connected, FastEthernet0/1 C 10.32.0.0/17 is directly connected, FastEthernet0/0 S* 0.0.0.0/0 [1/0] via 10.32.1.1 03-vpn-7140#
03-vpn-7140#show crypto enggine connection active ID Interface IP-Address State Algorithm Encrypt Decrypt 3 FastEthernet0/0 10.32.1.162 set HMAC_SHA+DES_56_CB 0 0 4 FastEthernet0/0 10.32.1.162 set HMAC_SHA+DES_56_CB 0 0 5 FastEthernet0/0 10.32.1.162 set HMAC_SHA+DES_56_CB 0 0 2098 FastEthernet0/0 10.32.1.162 set HMAC_SHA+DES_56_CB 0 1892 2099 FastEthernet0/0 10.32.1.162 set HMAC_SHA+DES_56_CB 11552 0
03-vpn-7140#show crypto ipsec sa
interface: FastEthernet0/0
Crypto map tag: temp, local addr. 10.32.1.162
local ident (addr/mask/prot/port): (10.32.1.162/255.255.255.255/0/0)
remote ident (addr/mask/prot/port): (10.32.1.161/255.255.255.255/0/0)
current_peer: 10.32.1.161
PERMIT, flags={transport_parent,}
#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 compr. failed: 0, #pkts decompress failed: 0
#send errors 0, #recv errors 0
local crypto endpt.: 10.32.1.162, remote crypto endpt.: 10.32.1.161
path mtu 1500, media mtu 1500
current outbound spi: 0
inbound esp sas:
inbound ah sas:
inbound pcp sas:
outbound esp sas:
outbound ah sas:
outbound pcp sas:
local ident (addr/mask/prot/port): (10.32.1.162/255.255.255.255/47/0)
remote ident (addr/mask/prot/port): (10.32.1.161/255.255.255.255/47/0)
current_peer: 10.32.1.161
PERMIT, flags={origin_is_acl,transport_parent,}
#pkts encaps: 12912, #pkts encrypt: 12912, #pkts digest 12912
#pkts decaps: 2382, #pkts decrypt: 2382, #pkts verify 2382
#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.: 10.32.1.162, remote crypto endpt.: 10.32.1.161
path mtu 1500, media mtu 1500
current outbound spi: 101
inbound esp sas:
spi: 0x4624F3AD(1176826797)
transform: esp-des esp-sha-hmac ,
in use settings ={Transport, }
slot: 0, conn id: 2098, flow_id: 69, crypto map: temp
sa timing: remaining key lifetime (k/sec): (1048130/3179)
IV size: 8 bytes
replay detection support: Y
inbound ah sas:
inbound pcp sas:
outbound esp sas:
spi: 0x101(257)
transform: esp-des esp-sha-hmac ,
in use settings ={Transport, }
slot: 0, conn id: 2099, flow_id: 70, crypto map: temp
sa timing: remaining key lifetime (k/sec): (1046566/3179)
IV size: 8 bytes
replay detection support: Y
outbound ah sas:
outbound pcp sas:
interface: Tunnel0
Crypto map tag: temp, local addr. 10.32.1.162
local ident (addr/mask/prot/port): (10.32.1.162/255.255.255.255/0/0)
remote ident (addr/mask/prot/port): (10.32.1.161/255.255.255.255/0/0)
current_peer: 10.32.1.161
PERMIT, flags={transport_parent,}
#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 compr. failed: 0, #pkts decompress failed: 0
#send errors 0, #recv errors 0
local crypto endpt.: 10.32.1.162, remote crypto endpt.: 10.32.1.161
path mtu 1500, media mtu 1500
current outbound spi: 0
inbound esp sas:
inbound ah sas:
inbound pcp sas:
outbound esp sas:
outbound ah sas:
outbound pcp sas:
local ident (addr/mask/prot/port): (10.32.1.162/255.255.255.255/47/0)
remote ident (addr/mask/prot/port): (10.32.1.161/255.255.255.255/47/0)
current_peer: 10.32.1.161
PERMIT, flags={origin_is_acl,transport_parent,}
#pkts encaps: 13017, #pkts encrypt: 13017, #pkts digest 13017
#pkts decaps: 2410, #pkts decrypt: 2410, #pkts verify 2410
#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.: 10.32.1.162, remote crypto endpt.: 10.32.1.161
path mtu 1500, media mtu 1500
current outbound spi: 101
inbound esp sas:
spi: 0x4624F3AD(1176826797)
transform: esp-des esp-sha-hmac ,
in use settings ={Transport, }
slot: 0, conn id: 2098, flow_id: 69, crypto map: temp
sa timing: remaining key lifetime (k/sec): (1048124/3176)
IV size: 8 bytes
replay detection support: Y
inbound ah sas:
inbound pcp sas:
outbound esp sas:
spi: 0x101(257)
transform: esp-des esp-sha-hmac ,
in use settings ={Transport, }
slot: 0, conn id: 2099, flow_id: 70, crypto map: temp
sa timing: remaining key lifetime (k/sec): (1046566/3176)
IV size: 8 bytes
replay detection support: Y
outbound ah sas:
outbound pcp sas:
Troubleshooting
Esta seção fornece informações que podem ser usadas para o troubleshooting da sua configuração.
Comandos para Troubleshooting
A Output Interpreter Tool (somente clientes registrados) oferece suporte a determinados comandos show, o que permite exibir uma análise da saída do comando show.
Observação: antes de emitir comandos debug, consulte Informações importantes sobre comandos debug.
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debug crypto isakmp (Cisco IOS Router) — Exibe informações detalhadas sobre a negociação da fase I (Main Mode) do Internet Key Exchange (IKE).
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debug crypto ipsec (Cisco IOS Router) — Exibe informações detalhadas sobre a negociação da fase II (Modo Rápido) do IKE.
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debug crypto engine (Cisco IOS Router) — Depura o processo de criptografia/descriptografia de pacotes e Diffie-Hellman (DH).
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debug ip rip (Cisco IOS Router) — Depura o protocolo de roteamento RIP.
Emita o comando show ip routing do VPN 5000 Concentrator.
VPN5002_8_A5E9C800: rip#show ip routing IP Routing Table for rip Directly Connected Routes: Destination Mask Ref Uses Type Interface 10.1.1.0 FFFFFF00 5 STIF VPN0:1 10.1.1.0 FFFFFFFF 0 STIF Local 10.1.1.1 @FFFFFFFF 5 LocalLocal 10.1.1.255 FFFFFFFF 0 STIF Local 20.20.20.0 FFFFFF00 1352 STIF Ether1:0.2 20.20.20.0 FFFFFFFF 0 STIF Local 20.20.20.20 @FFFFFFFF 14 LocalLocal 20.20.20.255 FFFFFFFF 1318 STIF Local 127.0.0.1 FFFFFFFF 0 STIF Local 172.18.124.0 FFFFFF00 13789 STIF Ether1:0.1 172.18.124.0 FFFFFFFF 0 STIF Local 172.18.124.219 @FFFFFFFF 6 LocalLocal 172.18.124.255 FFFFFFFF 13547 STIF Local 224.0.0.5 FFFFFFFF 0 STIF Local 224.0.0.6 FFFFFFFF 0 STIF Local 224.0.0.9 FFFFFFFF 15 STIF Local 255.255.255.255 @FFFFFFFF 221 LocalLocal Static Routes: Destination Mask Gateway Metric Ref Uses Type Interface 10.31.0.0 FFFF0000 Interface 1 0 Stat VPN0:1 10.32.1.162 @FFFFFFFF 10.32.1.161 2 0 *Stat VPN0:1 Dynamic Routes: Src/ Destination Mask Gateway Metric Ref Uses Type TTL Interface DEFAULT 10.1.1.2 1 293 RIP2 165 VPN0:1 10.0.0.0 FFFFFF00 172.18.124.216 1 0 RIP1 160 Ether1:0.1 10.31.0.0 FFFF8000 10.1.1.2 1 0 RIP2 165 VPN0:1 10.32.0.0 FFFF8000 10.1.1.2 1 0 RIP2 165 VPN0:1 Configured IP Routes: Destination Mask Gateway Metric IFnum Flags 10.31.0.0 FFFF0000 Interface 1 VPN 0:1 Redist = none Total Routes in use: 23 Mask -> @Host route Type -> Redist *rip #ospf
VPN5002_8_A5E9C800: rip#show vpn stat ver Current In High Running Script Script Script Active Negot Water Total Starts OK Error -------------------------------------------------------------- Users 0 0 0 0 0 0 0 Partners 1 0 1 1 1 0 0 Total 1 0 1 1 1 0 0 Stats VPN0:1 Wrapped 2697 Unwrapped 14439 BadEncap 0 BadAuth 0 BadEncrypt 0 rx IP 14439 rx IPX 0 rx Other 0 tx IP 2697 tx IPX 0 tx Other 0 IKE rekey 0 Input VPN pkts dropped due to no SA: 1 Input VPN pkts dropped due to no free queue entries: 0 IOP slot 1: Current In High Running Script Script Script Active Negot Water Total Starts OK Error -------------------------------------------------------------- Users 0 0 0 0 0 0 0 Partners 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Stats Wrapped Unwrapped BadEncap BadAuth BadEncrypt rx IP rx IPX rx Other tx IP tx IPX tx Other IKE rekey Input VPN pkts dropped due to no SA: 0 Input VPN pkts dropped due to no free queue entries: 0 IOP slot 2: Current In High Running Script Script Script Active Negot Water Total Starts OK Error -------------------------------------------------------------- Users 0 0 0 0 0 0 0 Partners 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Stats Wrapped Unwrapped BadEncap BadAuth BadEncrypt rx IP rx IPX rx Other tx IP tx IPX tx Other IKE rekey Input VPN pkts dropped due to no SA: 0 Input VPN pkts dropped due to no free queue entries: 0 IOP slot 3: Current In High Running Script Script Script Active Negot Water Total Starts OK Error -------------------------------------------------------------- Users 0 0 0 0 0 0 0 Partners 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Stats Wrapped Unwrapped BadEncap BadAuth BadEncrypt rx IP rx IPX rx Other tx IP tx IPX tx Other IKE rekey Input VPN pkts dropped due to no SA: 0 Input VPN pkts dropped due to no free queue entries: 0
Informações Relacionadas
Histórico de revisões
| Revisão | Data de publicação | Comentários |
|---|---|---|
1.0 |
09-Nov-2001 |
Versão inicial |
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