Internet Protocol Security (IPsec) is een raamwerk van open standaarden dat beveiligde privé communicatie via IP-netwerken garandeert. Op basis van normen die zijn ontwikkeld door de Internet Engineering Task Force (IETF), garandeert IPsec vertrouwelijkheid, integriteit en authenticiteit van datacommunicatie via een openbaar IP-netwerk. IPsec vormt een noodzakelijke component voor een op standaarden gebaseerde, flexibele oplossing om een op het hele netwerk geldend veiligheidsbeleid te implementeren.
Dit document biedt een configuratievoorbeeld van IPsec tussen twee Cisco-kabelmodems. Deze configuratie maakt een encryptie-tunnel over een kabelnetwerk tussen twee Cisco uBR9xx Series kabelmodemrouters. Al het verkeer tussen de twee netwerken is versleuteld. Maar verkeer dat bestemd is voor andere netwerken mag niet worden versleuteld. Voor kleine Office-, startkantoor- (SOHO)-gebruikers kan u virtuele particuliere netwerken (VPN’s) via een kabelnetwerk maken.
Er zijn geen specifieke vereisten van toepassing op dit document.
De modems moeten aan deze vereisten voldoen om IPsec op twee kabelmodems te configureren:
Cisco uBR904, uBR905 of uBR924 in routingmodus
IPsec 56-functieset
Cisco IOS® softwarerelease 12.0(5)T of hoger
Daarnaast moet u een Cable Modem Termination System (CMTS) hebben, dat is elke DOCSIS-conforme head-end kabelrouter (Data-over-Cable Service Interface Specifications), zoals Cisco uBR7246, Cisco uBR7223 of Cisco uBR7246VXR.
De informatie in dit document is gebaseerd op de apparaten in een specifieke laboratoriumomgeving. Alle apparaten die in dit document worden beschreven, hadden een opgeschoonde (standaard)configuratie. Als uw netwerk live is, moet u de potentiële impact van elke opdracht begrijpen.
Het voorbeeld in dit document gebruikt een uBR904-kabelmodem, een uBR924-kabelmodem en een uBR7246VXR CMTS. De kabelmodems voeren Cisco IOS-softwarerelease 12.1(6)E uit en de CMTS voert Cisco IOS-softwarerelease 12.1(4)EC uit.
Opmerking: Dit voorbeeld wordt gedaan met handmatige configuratie op de kabelmodems door de console poort. Als een geautomatiseerd proces wordt uitgevoerd via het DOCSIS-configuratiebestand (het ios.cfg-script is gemaakt met de IPsec-configuratie) dan kunnen de toegangslijsten 100 en 101 niet worden gebruikt. Dit komt doordat de Cisco-implementatie van de Simple Network Management Protocol (SNMP) docsDevNmAccess-tabel Cisco IOS-toegangslijsten gebruikt. Er wordt één toegangslijst per interface gemaakt. Op uBR904, 924 en 905 worden de eerste twee toegangslijsten over het algemeen gebruikt (100 en 101). Op een kabelmodem die Universal Serial Bus (USB) ondersteunt, zoals CVA120, worden drie toegangslijsten gebruikt (100, 101 en 102).
Deze sectie bevat informatie over het configureren van de functies die in dit document worden beschreven.
N.B.: Gebruik het Opdrachtupgereedschap (alleen geregistreerde klanten) om meer informatie te vinden over de opdrachten in dit document.
Het netwerk in dit document is als volgt opgebouwd:
Opmerking: Alle IP-adressen in dit diagram hebben een 24-bits masker.
Dit document gebruikt deze configuraties:
uBR924-1 |
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service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname ubr924-1 ! enable password ww ! ! ! ! clock timezone - -8 ip subnet-zero no ip finger ! ip audit notify log ip audit po max-events 100 ! ! crypto isakmp policy 10 !--- Creates an Internet Key Exchange (IKE) policy with the specified priority !--- number of 10. The range for the priority is 1 to 10000, where 1 is the !--- highest priority. This command also enters Internet Security Association !--- and Key Management Protocol (ISAKMP) policy configuration command mode. hash md5 !--- Specifies the MD5 (HMAC variant) hash algorithm for packet authentication. authentication pre-share !--- Specifies that the authentication keys are pre-shared, as opposed to !--- dynamically negotiated using Rivest, Shamir, and Adelman (RSA) public !--- key signatures. group 2 !--- Diffie-Hellman group for key negotiation. lifetime 3600 !--- Defines how long, in seconds, each security association should exist before !--- it expires. Its range is 60 to 86400, and in this case, it is 1 hour. crypto isakmp key mykey address 18.18.18.18 !--- Specifies the pre-shared key that should be used with the peer at the !--- specific IP address. The key can be any arbitrary alphanumeric key up to !--- 128 characters. The key is case-sensitive and must be entered identically !--- on both routers. In this case, the key is mykey and the peer is the !--- Ethernet address of uBR904-2 . ! crypto IPSec transform-set TUNNELSET ah-md5-hmac esp-des !--- Establishes the transform set to use for IPsec encryption. As many as !--- three transformations can be specified for a set. Authentication Header !--- and ESP are in use. Another common transform set used in industry is !--- esp-des esp-md5-hmac. ! crypto map MYMAP local-address Ethernet0 !--- Creates the MYMAP crypto map and applies it to the Ethernet0 interface. crypto map MYMAP 10 ipsec-isakmp !--- Creates a crypto map numbered 10 and enters crypto map configuration mode. set peer 18.18.18.18 !--- Identifies the IP address for the destination peer router. In this case, !--- the Ethernet interface of the remote cable modem (ubr904-2) is used. set transform-set TUNNELSET !--- Sets the crypto map to use the transform set previously created. match address 101 !--- Sets the crypto map to use the access list that specifies the type of !--- traffic to be encrypted. !--- Do not use access lists 100, 101, and 102 if the IPsec config is !--- downloaded through the ios.cfg in the DOCSIS configuration file. ! ! ! ! voice-port 0 input gain -2 output attenuation 0 ! voice-port 1 input gain -2 output attenuation 0 ! ! ! interface Ethernet0 ip address 19.19.19.19 255.255.255.0 ip rip send version 2 ip rip receive version 2 no ip route-cache no ip mroute-cache ! interface cable-modem0 ip rip send version 2 ip rip receive version 2 no ip route-cache no ip mroute-cache cable-modem downstream saved channel 525000000 39 1 cable-modem mac-timer t2 40000 no cable-modem compliant bridge crypto map MYMAP !--- Applies the previously created crypto map to the cable interface. ! router rip version 2 network 19.0.0.0 network 172.16.0.0 ! ip default-gateway 172.16.31.1 ip classless ip http server ! access-list 101 permit ip 19.19.19.0 0.0.0.255 18.18.18.0 0.0.0.255 !--- Access list that identifies the traffic to be encrypted. In this case, !--- it is setting traffic from the local Ethernet network to the remote !--- Ethernet network. snmp-server manager ! line con 0 transport input none line vty 0 4 password ww login ! end |
De configuratie van de andere kabelmodem is zeer gelijkaardig, dus de meeste commentaren in de vorige configuratie worden weggelaten.
uBR904-2 |
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version 12.1 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname ubr904-2 ! enable password ww ! ! ! ! ! clock timezone - -8 ip subnet-zero no ip finger ! ! ! crypto isakmp policy 10 hash md5 authentication pre-share group 2 lifetime 3600 crypto isakmp key mykey address 19.19.19.19 ! ! crypto IPSec transform-set TUNNELSET ah-md5-hmac ESP-Des ! crypto map MYMAP local-address Ethernet0 crypto map MYMAP 10 ipsec-isakmp set peer 19.19.19.19 !--- Identifies the IP address for the destination peer router. In this case, !--- the Ethernet interface of the remote cable modem (uBR924-1) is used. set transform-set TUNNELSET match address 101 ! ! ! ! interface Ethernet0 ip address 18.18.18.18 255.255.255.0 ip rip send version 2 ip rip receive version 2 ! interface cable-modem0 ip rip send version 2 ip rip receive version 2 no keepalive cable-modem downstream saved channel 555000000 42 1 cable-modem Mac-timer t2 40000 no cable-modem compliant bridge crypto map MYMAP ! router rip version 2 network 18.0.0.0 network 172.16.0.0 ! ip default-gateway 172.16.30.1 ip classless no ip http server ! access-list 101 permit ip 18.18.18.0 0.0.0.255 19.19.19.0 0.0.0.255 snmp-server manager ! line con 0 transport input none line vty 0 4 password ww login ! end |
CMTS uBR7246VXR runt ook Routing Information Protocol (RIP) versie 2, zodat de routing werkt. Dit is de RIP-configuratie die op de CMTS wordt gebruikt:
uBR7246VXR router |
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router rip version 2 network 172.16.0.0 no auto-summary |
Gebruik dit gedeelte om te bevestigen dat de configuratie correct werkt.
Zo controleert u of IPsec werkt:
Controleer deze dingen:
De Cisco IOS-software ondersteunt IPsec.
De draaiende configuratie is correct.
Interfaces zijn omhoog.
Routing werkt.
De toegangslijst die is gedefinieerd om verkeer te versleutelen, is correct.
Maak verkeer en kijk naar Encrypt en Decrypt, om de hoeveelheid te zien die stijgt.
Zet de debugs aan voor crypto.
Het Uitvoer Tolk (uitsluitend geregistreerde klanten) (OIT) ondersteunt bepaalde show opdrachten. Gebruik de OIT om een analyse van tonen opdrachtoutput te bekijken.
Geef de show versie opdracht op in beide kabelmodems.
ubr924-1#show version Cisco Internetwork Operating System Software IOS (tm) 920 Software (UBR920-K1O3SV4Y556I-M), Version 12.1(6), RELEASE SOFTWARE (fc1) Copyright (c) 1986-2000 by Cisco Systems, Inc. Compiled Wed 27-Dec-00 16:36 by kellythw Image text-base: 0x800100A0, data-base: 0x806C1C20 ROM: System Bootstrap, Version 12.0(6r)T3, RELEASE SOFTWARE (fc1) ubr924-1 uptime is 1 hour, 47 minutes System returned to ROM by reload at 10:39:05 - Fri Feb 9 2001 System restarted at 10:40:05 - Fri Feb 9 2001 System image file is "flash:ubr920-k1o3sv4y556i-mz.121-6" cisco uBR920 CM (MPC850) processor (revision 3.e) with 15872K/1024K bytes of memory. Processor board ID FAA0422Q04F Bridging software. 1 Ethernet/IEEE 802.3 interface(s) 1 Cable Modem network interface(s) 3968K bytes of processor board System flash (Read/Write) 1536K bytes of processor board Boot flash (Read/Write) Configuration register is 0x2102
UBR924-1 voert Cisco IOS-softwarerelease 12.1(6)E uit met de WAARDE SMALL OFFICE/VOICE/FW IPSec 56 functieset.
ubr904-2#show version Cisco Internetwork Operating System Software IOS (TM) 900 Software (UBR900-K1OY556I-M), Version 12.1(6), RELEASE SOFTWARE (fc1) Copyright (c) 1986-2000 by cisco Systems, Inc. Compiled Wed 27-DEC-00 11:06 by kellythw Image text-base: 0x08004000, database: 0x085714DC ROM: System Bootstrap, Version 11.2(19980518:195057), RELEASED SOFTWARE ROM: 900 Software (UBR900-RBOOT-M), Version 11.3(11)NA, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1) ubr904-2 uptime is 1 hour, 48 minutes System returned to ROM by reload at 10:38:44 - Fri Feb 9 2001 System restarted at 10:40:37 - Fri Feb 9 2001 System image file is "flash:ubr900-k1oy556i-mz.121-6" cisco uBR900 CM (68360) processor (revision D) with 8192K bytes of memory. Processor board ID FAA0235Q0ZS Bridging software. 1 Ethernet/IEEE 802.3 interface(s) 1 Cable Modem network interface(s) 4096K bytes of processor board System flash (Read/Write) 2048K bytes of processor board Boot flash (Read/Write) Configuration register is 0x2102
UBR904-2 voert Cisco IOS-softwarerelease 12.1(6)E uit met KLEIN KANTOOR/FW IPSec 56 functieset.
ubr924-1#show ip interface brief Interface IP-Address OK? Method Status Protocol Ethernet0 19.19.19.19 YES NVRAM up up cable-modem0 172.16.31.20 YES unset up up ubr904-2#show ip interface brief Interface IP-Address OK? Method Status Protocol Ethernet0 18.18.18.18 YES NVRAM up up cable-modem0 172.16.30.18 YES unset up up
Van de laatste opdracht, kunt u zien dat de Ethernet interfaces omhoog zijn. De IP adressen van de Ethernet interfaces werden handmatig ingevoerd. De kabelinterfaces zijn ook omhoog en ze hebben hun IP-adressen door DHCP geleerd. Omdat deze kabeladressen dynamisch toegewezen worden, kunnen zij niet als peers in de configuratie van IPSec worden gebruikt.
ubr924-1#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 - ISIS level-1, L2 - ISIS level-2, ia - ISIS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is 172.16.31.1 to network 0.0.0.0 19.0.0.0/24 is subnetted, 1 subnets C 19.19.19.0 is directly connected, Ethernet0 R 18.0.0.0/8 [120/2] via 172.16.31.1, 00:00:23, cable-modem0 172.16.0.0/16 is variably subnetted, 4 subnets, 3 masks R 172.16.135.0/25 [120/1] via 172.16.31.1, 00:00:23, cable-modem0 R 172.16.29.0/27 [120/1] via 172.16.31.1, 00:00:23, cable-modem0 R 172.16.30.0/24 [120/1] via 172.16.31.1, 00:00:23, cable-modem0 C 172.16.31.0/24 is directly connected, cable-modem0 R 192.168.99.0/24 [120/3] via 172.16.31.1, 00:00:24, cable-modem0 10.0.0.0/24 is subnetted, 2 subnets R 10.10.10.0 [120/2] via 172.16.31.1, 00:00:24, cable-modem0 S* 0.0.0.0/0 [1/0] via 172.16.31.1
Je kunt aan deze output zien dat uBR924-1 leert over route 18.18.18.0, de Ethernet interface van uBR904-2.
ubr904-2#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 - ISIS, L1 - ISIS level-1, L2 - ISIS level-2, IA - ISIS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is 172.16.30.1 to network 0.0.0.0 R 19.0.0.0/8 [120/2] via 172.16.30.1, 00:00:17, cable-modem0 18.0.0.0/24 is subnetted, 1 subnets C 18.18.18.0 is directly connected, Ethernet0 172.16.0.0/16 is variably subnetted, 4 subnets, 3 masks R 172.16.135.0/25 [120/1] via 172.16.30.1, 00:00:17, cable-modem0 R 172.16.29.224/27 [120/1] via 172.16.30.1, 00:00:17, cable-modem0 C 172.16.30.0/24 is directly connected, cable-modem0 R 172.16.31.0/24 [120/1] via 172.16.30.1, 00:00:17, cable-modem0 R 192.168.99.0/24 [120/3] via 172.16.30.1, 00:00:18, cable-modem0 10.0.0.0/24 is subnetted, 1 subnets R 10.10.10.0 [120/2] via 172.16.30.1, 00:00:18, cable-modem0 S* 0.0.0.0/0 [1/0] via 172.16.30.1
Van de routingtabel van uBR904-2, kunt u zien dat het netwerk voor Ethernet van uBR924-1 in de routingtabel is.
Opmerking: Er kunnen gevallen zijn waarin u geen routingprotocol tussen de twee kabelmodems kunt uitvoeren. In dergelijke gevallen moet u statische routes op CMTS aan direct verkeer voor de Ethernet interfaces van de kabelmodems toevoegen.
Het volgende om te controleren is de certificering van de toegangslijst. geef de opdracht toegangslijsten op beide routers uit.
ubr924-1#show access-lists Extended IP access list 101 permit ip 19.19.19.0 0.0.0.255 18.18.18.0 0.0.0.255 (2045 matches) ubr904-2#show access-lists Extended IP access list 101 permit ip 18.18.18.0 0.0.0.255 19.19.19.0 0.0.0.255 (2059 matches)
De toegangslijst stelt de IPsec-sessie in wanneer het LAN achter uBR924-1 (19.19.19.0) IP-verkeer naar het LAN achter uBR904-2 (18.18.18.0) en vice versa stuurt. Gebruik 'geen' op de toegangslijsten, omdat dit problemen veroorzaakt. Zie IPsec-netwerkbeveiliging configureren voor meer informatie.
Er is geen IPsec-verkeer. Geef de actieve opdracht van de sleutelverbinding uit.
ubr924-1#show crypto engine connection active ID Interface IP-Address State Algorithm Encrypt Decrypt 1 set HMAC_MD5+DES_56_CB 0 0 ubr904-2#show crypto engine connection active ID Interface IP-Address State Algorithm Encrypt Decrypt 1 set HMAC_MD5+DES_56_CB 0 0
Er zijn geen IPsec-verbindingen omdat er geen verkeer is dat de toegangslijsten heeft aangepast.
Opmerking: Raadpleeg Belangrijke informatie over debug Commands voordat u debug-opdrachten gebruikt.
De volgende stap is het aanzetten van een aantal crypto-debugs om interessant verkeer te genereren.
In dit voorbeeld worden deze apparaten ingeschakeld:
debug van crypto-motor
debug van crypto IPsec
debug van crypto-sleuteluitwisseling
debug van crypto isakmp
U moet eerst wat interessant verkeer genereren om de output van de debugs te zien. Geef een uitgebreid ping uit van de Ethernet poort van uBR904-2 naar de PC op uBR924-1 (IP-adres 19.19.19.1).
ubr904-2#ping ip Target IP address: 19.19.19.1 !--- IP address of PC1 behind the Ethernet of uBR924-1. Repeat count [5]: 100 !--- Sends 100 pings. Datagram size [100]: Timeout in seconds [2]: Extended commands [n]: y Source address or interface: 18.18.18.18 !--- IP address of the Ethernet behind uBR904-2. Type of service [0]: Set DF bit in IP header? [no]: Validate reply data? [no]: Data pattern [0xABCD]: Loose, Strict, Record, Timestamp, Verbose[none]: Sweep range of sizes [n]: Type escape sequence to abort. Sending 100, 100-byte ICMP Echos to 19.19.19.1, timeout is 2 seconds:
UBR924-2 toont deze debug uitvoer:
ubr904-2# 01:50:37: IPSec(sa_request): , (key eng. msg.) src= 18.18.18.18, dest= 19.19.19.19, src_proxy= 18.18.18.0/255.255.255.0/0/0 (type=4), dest_proxy= 19.19.19.0/255.255.255.0/0/0 (type=4), protocol= AH, transform= ah-md5-hmac , lifedur= 3600s and 4608000kb, spi= 0x19911A16(428939798), conn_id= 0, keysize= 0, flags= 0x4004 01:50:37: IPSec(sa_request): , (key Eng. msg.) src= 18.18.18.18, dest= 19.19.19.19, src_proxy= 18.18.18.0/255.255.255.0/0/0 (type=4), dest_proxy= 19.19.19.0/255.255.255.0/0/0 (type=4), protocol= ESP, transform= ESP-Des , lifedur= 3600s and 4608000kb, spi= 0x7091981(118036865), conn_id= 0, keysize= 0, flags= 0x4004 01:50:37: ISAKMP: received ke message (1/2) 01:50:37: ISAKMP (0:1): sitting IDLE. Starting QM immediately (QM_IDLE) 01:50:37: ISAKMP (0:1): beginning Quick Mode exchange, M-ID of 1108017901 01:50:37: CryptoEngine0: generate hmac context for conn id 1 01:50:37: ISAKMP (1): sending packet to 19.19.19.19 (I) QM_IDLE 01:50:37: ISAKMP (1): received packet from 19.19.19.19 (I) QM_IDLE 01:50:37: CryptoEngine0: generate hmac context for conn id 1 01:50:37: ISAKMP (0:1): processing SA payload. message ID = 1108017901 01:50:37: ISAKMP (0:1): Checking IPSec proposal 1 01:50:37: ISAKMP: transform 1, AH_MD5 01:50:37: ISAKMP: attributes in transform: 01:50:3.!!!!!!!!!!!!!!!!!!!!!!!7: ISAKMP: encaps is 1 01:50:37: ISAKMP: SA life type in seconds 01:50:37: ISAKMP: SA life duration (basic) of 3600 01:50:37: ISAKMP: SA life type in kilobytes 01:50:37: ISAKMP: SA life duration (VPI) of 0x0 0x46 0x50 0x0 01:50:37: ISAKMP: authenticator is HMAC-MD5 01:50:37: validate proposal 0 01:50:37: ISAKMP (0:1): atts are acceptable. 01:50:37: ISAKMP (0:1): Checking IPSec proposal 1 01:50:37: ISAKMP: transform 1, ESP_DES 01:50:37: ISAKMP: attributes in transform: 01:50:37: ISAKMP: encaps is 1 01:50:37: ISAKMP: SA life type in seconds 01:50:37: ISAKMP: SA life duration (basic) of 3600 01:50:37: ISAKMP: SA life type in kilobytes 01:50:37: ISAKMP: SA life duration (VPI) of 0x0 0x46 0x50 0x0 01:50:37: validate proposal 0 01:50:37: ISAKMP (0:1): atts are acceptable. 01:50:37: IPSec(validate_proposal_request): proposal part #1, (key Eng. msg.) dest= 19.19.19.19, src= 18.18.18.18, dest_proxy= 19.19.1!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Success rate is 99 percent (99/100), round-trip min/avg/max = 30/40/70 ms ubr904-2#
Merk op dat het eerste ping mislukt is. Dat komt omdat het de verbinding moet leggen.
UBR924-1 toont deze debug uitvoer:
ubr924-1# 01:50:24: ISAKMP (1): received packet from 18.18.18.18 (R) QM_IDLE 01:50:24: CryptoEngine0: generate hmac context for conn id 1 01:50:24: ISAKMP (0:1): processing SA payload. Message ID = 1108017901 01:50:24: ISAKMP (0:1): Checking IPSec proposal 1 01:50:24: ISAKMP: transform 1, AH_MD5 01:50:24: ISAKMP: attributes in transform: 01:50:24: ISAKMP: encaps is 1 01:50:24: ISAKMP: SA life type in seconds 01:50:24: ISAKMP: SA life duration (basic) of 3600 01:50:24: ISAKMP: SA life type in kilobytes 01:50:24: ISAKMP: SA life duration (VPI) of 0x0 0x46 0x50 0x0 01:50:24: ISAKMP: authenticator is HMAC-MD5 01:50:24: validate proposal 0 01:50:24: ISAKMP (0:1): atts are acceptable. 01:50:24: ISAKMP (0:1): Checking IPSec proposal 1 01:50:24: ISAKMP: transform 1, ESP_DES 01:50:24: ISAKMP: attributes in transform: 01:50:24: ISAKMP: encaps is 1 01:50:24: ISAKMP: SA life type in seconds 01:50:24: ISAKMP: SA life duration (basic) of 3600 01:50:24: ISAKMP: SA life type in kilobytes 01:50:24: ISAKMP: SA life duration (VPI) of 0x0 0x46 0x50 0x0 01:50:24: validate proposal 0 01:50:24: ISAKMP (0:1): atts are acceptable. 01:50:24: IPSec(validate_proposal_request): proposal part #1, (key Eng. msg.) dest= 19.19.19.19, src= 18.18.18.18, dest_proxy= 19.19.19.0/255.255.255.0/0/0 (type=4), src_proxy= 18.18.18.0/255.255.255.0/0/0 (type=4), protocol= AH, transform= ah-md5-hmac , lifedur= 0s and 0kb, spi= 0x0(0), conn_id= 0, keysize= 0, flags= 0x4 01:50:24: IPSec(validate_proposal_request): proposal part #2, (key Eng. msg.) dest= 19.19.19.19, src= 18.18.18.18, dest_proxy= 19.19.19.0/255.255.255.0/0/0 (type=4), src_proxy= 18.18.18.0/255.255.255.0/0/0 (type=4), protocol= ESP, transform= ESP-Des , lifedur= 0s and 0kb, spi= 0x0(0), conn_id= 0, keysize= 0, flags= 0x4 01:50:24: validate proposal request 0 01:50:24: ISAKMP (0:1): processing NONCE payload. Message ID = 1108017901 01:50:24: ISAKMP (0:1): processing ID payload. Message ID = 1108017901 01:50:24: ISAKMP (1): ID_IPV4_ADDR_SUBNET src 18.18.18.0/255.255.255.0 prot 0 Port 0 01:50:24: ISAKMP (0:1): processing ID payload. Message ID = 1108017901 01:50:24: ISAKMP (1): ID_IPV4_ADDR_SUBNET dst 19.19.19.0/255.255.255.0 prot 0 Port 0 01:50:24: ISAKMP (0:1): asking for 2 spis from IPSec 01:50:24: IPSec(key_engine): got a queue event... 01:50:24: IPSec(spi_response): getting spi 393021796 for SA from 18.18.18.18 to 19.19.19.19 for prot 2 01:50:24: IPSec(spi_response): getting spi 45686884 for SA from 18.18.18.18 to 19.19.19.19 for prot 3 01:50:24: ISAKMP: received ke message (2/2) 01:50:24: CryptoEngine0: generate hmac context for conn id 1 01:50:24: ISAKMP (1): sending packet to 18.18.18.18 (R) QM_IDLE 01:50:24: ISAKMP (1): received packet from 18.18.18.18 (R) QM_IDLE 01:50:24: CryptoEngine0: generate hmac context for conn id 1 01:50:24: IPSec allocate flow 0 01:50:24: IPSec allocate flow 0 01:50:24: ISAKMP (0:1): Creating IPSec SAs 01:50:24: inbound SA from 18.18.18.18 to 19.19.19.19 (proxy 18.18.18.0 to 19.19.19.0) 01:50:24: has spi 393021796 and conn_id 2000 and flags 4 01:50:24: lifetime of 3600 seconds 01:50:24: lifetime of 4608000 kilobytes 01:50:24: outbound SA from 19.19.19.19 to 18.18.18.18 (proxy 19.19.19.0 to 18.18.18.0) 01:50:24: has spi 428939798 and conn_id 2001 and flags 4 01:50:24: lifetime of 3600 seconds 01:50:24: lifetime of 4608000 kilobytes 01:50:24: ISAKMP (0:1): Creating IPSec SAs 01:50:24: inbound SA from 18.18.18.18 to 19.19.19.19 (proxy 18.18.18.0 to 19.19.19.0) 01:50:24: has spi 45686884 and conn_id 2002 and flags 4 01:50:24: lifetime of 3600 seconds 01:50:24: lifetime of 4608000 kilobytes 01:50:24: outbound SA from 19.19.19.19 to 18.18.18.18 (proxy 19.19.19.0 to 18.18.18.0) 01:50:24: has spi 118036865 and conn_id 2003 and flags 4 01:50:25: lifetime of 3600 seconds 01:50:25: lifetime of 4608000 kilobytes 01:50:25: ISAKMP (0:1): deleting node 1108017901 error FALSE reason "quick mode done (await()" 01:50:25: IPSec(key_engine): got a queue event... 01:50:25: IPSec(initialize_sas): , (key Eng. msg.) dest= 19.19.19.19, src= 18.18.18.18, dest_proxy= 19.19.19.0/255.255.255.0/0/0 (type=4), src_proxy= 18.18.18.0/255.255.255.0/0/0 (type=4), protocol= AH, transform= ah-md5-hmac , lifedur= 3600s and 4608000kb, spi= 0x176D0964(393021796), conn_id= 2000, keysize= 0, flags= 0x4 01:50:25: IPSec(initialize_sas): , (key Eng. msg.) src= 19.19.19.19, dest= 18.18.18.18, src_proxy= 19.19.19.0/255.255.255.0/0/0 (type=4), dest_proxy= 18.18.18.0/255.255.255.0/0/0 (type=4), protocol= AH, transform= ah-md5-hmac , lifedur= 3600s and 4608000kb, spi= 0x19911A16(428939798), conn_id= 2001, keysize= 0, flags= 0x4 01:50:25: IPSec(initialize_sas): , (key Eng. msg.) dest= 19.19.19.19, src= 18.18.18.18, dest_proxy= 19.19.19.0/255.255.255.0/0/0 (type=4), src_proxy= 18.18.18.0/255.255.255.0/0/0 (type=4), protocol= ESP, transform= ESP-Des , lifedur= 3600s and 4608000kb, spi= 0x2B92064(45686884), conn_id= 2002, keysize= 0, flags= 0x4 01:50:25: IPSec(initialize_sas): , (key Eng. msg.) src= 19.19.19.19, dest= 18.18.18.18, src_proxy= 19.19.19.0/255.255.255.0/0/0 (type=4), dest_proxy= 18.18.18.0/255.255.255.0/0/0 (type=4), protocol= ESP, transform= ESP-Des , lifedur= 3600s and 4608000kb, spi= 0x7091981(118036865), conn_id= 2003, keysize= 0, flags= 0x4 01:50:25: IPSec(create_sa): sa created, (sa) sa_dest= 19.19.19.19, sa_prot= 51, sa_spi= 0x176D0964(393021796), sa_trans= ah-md5-hmac , sa_conn_id= 2000 01:50:25: IPSec(create_sa): sa created, (sa) sa_dest= 18.18.18.18, sa_prot= 51, sa_spi= 0x19911A16(428939798), sa_trans= ah-md5-hmac , sa_conn_id= 2001 01:50:25: IPSec(create_sa): sa created, (sa) sa_dest= 19.19.19.19, sa_prot= 50, sa_spi= 0x2B92064(45686884), sa_trans= ESP-Des , sa_conn_id= 2002 01:50:25: IPSec(create_sa): sa created, (sa) sa_dest= 18.18.18.18, sa_prot= 50, sa_spi= 0x7091981(118036865), sa_trans= ESP-Des , sa_conn_id= 2003 ubr924-1#
Zodra de IPsec-tunnel is gecreëerd, kunt u de verbinding en de versleutelde en gedecrypteerde pakketten zien.
ubr924-1#show crypto engine connection active ID Interface IP-Address State Algorithm Encrypt Decrypt 1 set HMAC_MD5+DES_56_CB 0 0 2000 cable-modem0 172.16.31.20 set HMAC_MD5 0 99 2001 cable-modem0 172.16.31.20 set HMAC_MD5 99 0 2002 cable-modem0 172.16.31.20 set DES_56_CBC 0 99 2003 cable-modem0 172.16.31.20 set DES_56_CBC 99 0
De eerste lijn van 200x toont de 99 ontvangen pakketten. Ze moet de pakketten decrypteren om ze naar PC1 te verzenden. De tweede lijn toont 99 verzonden pakketten. Het moet de pakketten versleutelen voordat het naar uBR904-2 wordt verzonden. De derde en de vierde lijn voeren hetzelfde proces uit, maar met ESP-DES-transformatie in plaats van AH-MD5-HMAC.
Opmerking: Als de transformatieset die op de kabelmodem is geconfigureerd ESP-DES ESP-MD5-HMAC is, zie je alleen twee autonome systemen (ASs), in tegenstelling tot de vier die in de vorige show-opdracht zijn getoond.
ubr904-2#show crypto engine connection active ID Interface IP-Address State Algorithm Encrypt Decrypt 1 set HMAC_MD5+DES_56_CB 0 0 2000 cable-modem0 172.16.30.18 set HMAC_MD5 0 99 2001 cable-modem0 172.16.30.18 set HMAC_MD5 99 0 2002 cable-modem0 172.16.30.18 set DES_56_CBC 0 99 2003 cable-modem0 172.16.30.18 set DES_56_CBC 99 0
Geef een uitgebreide ping uit aan PC2 van uBR924-1 om te zien of de tellers toename voor de gecodeerde en gedecrypteerde pakketten.
ubr924-1#ping ip Target IP address: 18.18.18.1 Repeat count [5]: 50 Datagram size [100]: Timeout in seconds [2]: Extended commands [n]: y Source address or interface: 19.19.19.19 Type of service [0]: Set DF bit in IP header? [no]: Validate reply data? [no]: Data pattern [0xABCD]: Loose, Strict, Record, Timestamp, Verbose[none]: Sweep range of sizes [n]: Type escape sequence to abort. Sending 50, 100-byte ICMP Echos to 18.18.18.1, timeout is 2 seconds: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Success rate is 100 percent (50/50), round-trip min/avg/max = 28/30/33 ms ubr924-1#show crypto engine connection active ID Interface IP-Address State Algorithm Encrypt Decrypt 1 set HMAC_MD5+DES_56_CB 0 0 2000 cable-modem0 172.16.31.20 set HMAC_MD5 0 149 2001 cable-modem0 172.16.31.20 set HMAC_MD5 149 0 2002 cable-modem0 172.16.31.20 set DES_56_CBC 0 149 2003 cable-modem0 172.16.31.20 set DES_56_CBC 149 0 ubr904-2#show crypto engine connection active ID Interface IP-Address State Algorithm Encrypt Decrypt 1 set HMAC_MD5+DES_56_CB 0 0 2000 cable-modem0 172.16.30.18 set HMAC_MD5 0 149 2001 cable-modem0 172.16.30.18 set HMAC_MD5 149 0 2002 cable-modem0 172.16.30.18 set DES_56_CBC 0 149 2003 cable-modem0 172.16.30.18 set DES_56_CBC 149 0
Een ander uitgebreid ping kan worden uitgegeven, om te zien dat de tellers opnieuw groeien. ditmaal moet u een 500-pakje pingelen van uBR904-2 naar de Ethernet-interface van uBR924-1 (19.19.19).
ubr904-2#ping ip Target IP address: 19.19.19.19 Repeat count [5]: 500 Datagram size [100]: 1000 Timeout in seconds [2]: Extended commands [n]: y Source address or interface: 18.18.18.18 Type of service [0]: Set DF bit in IP header? [no]: Validate reply data? [no]: Data pattern [0xABCD]: Loose, Strict, Record, Timestamp, Verbose[none]: Sweep range of sizes [n]: Type escape sequence to abort. Sending 500, 1000-byte ICMP Echos to 19.19.19.19, timeout is 2 seconds: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 01:59:06: IPSec(encapsulate): encaps area too small, moving to new buffer: idbtype 0, encaps_size 26, header size 60, avail 84!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!! Success rate is 100 percent (500/500), round-trip min/avg/max = 98/135/352 ms ubr904-2#show crypto engine connection active ID Interface IP-Address State Algorithm Encrypt Decrypt 1 set HMAC_MD5+DES_56_CB 0 0 2000 cable-modem0 172.16.30.18 set HMAC_MD5 0 649 2001 cable-modem0 172.16.30.18 set HMAC_MD5 649 0 2002 cable-modem0 172.16.30.18 set DES_56_CBC 0 649 2003 cable-modem0 172.16.30.18 set DES_56_CBC 649 0 ubr924-1#show crypto engine connection active ID Interface IP-Address State Algorithm Encrypt Decrypt 1 set HMAC_MD5+DES_56_CB 0 0 2000 cable-modem0 172.16.31.20 set HMAC_MD5 0 649 2001 cable-modem0 172.16.31.20 set HMAC_MD5 649 0 2002 cable-modem0 172.16.31.20 set DES_56_CBC 0 649 2003 cable-modem0 172.16.31.20 set DES_56_CBC 649 0
U kunt de heldere crypto isakmp uitgeven en crypto als opdrachten verwijderen om de verbindingen te ontgrendelen. Als er tijdens de verlooptijd geen verkeer via de IPsec-tunnel is, stelt IPsec de verbinding automatisch opnieuw in.
Er is momenteel geen specifieke informatie beschikbaar voor het oplossen van deze configuratie.