FTD BGP configureren via IPSec VPN

Inleiding

Dit document beschrijft hoe u de BGP-buurten (Border Gateway Protocol) via een IPsec site-to-site VPN-tunnelheid tussen twee Cisco FirePower Threat Defense (FTD).

Voorwaarden

Vereisten

Cisco raadt kennis van de volgende onderwerpen aan:

• BGP-configuraties voor FTD
• IPsec site-to-site VPN-tunnelconfiguraties op FTD

Gebruikte componenten

De informatie in dit document is gebaseerd op Cisco FTDv met 6.4.0.7 en 6.4.0.9.

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.

Configureren

 In dit deel wordt de configuratie beschreven die op de FTD's nodig is om BGP-buren op te halen via een IPSec-tunnelband.

Netwerkdiagram

IPSec VPN configureren

Stap 1. Maak een nieuwe point-to-point VPN-topologie.

Navigeer naar Apparaten > VPN > Site-to-Site, en voeg een nieuw FirePower Threat Defense Devices VPN toe.

Stap 2. Configureer FTD1 als een van de eindpunten.

• Objectnetwerk FTD1-Outside-IP bevat het externe interface-IP adres van FTD1.
• Exemplaren obj-10.1.1.0 en obj-10.1.2.0 bevatten respectievelijk 10.1.1.0/24 en 10.1.2.0/24. VPN-verkeer wordt gegenereerd vanuit deze subnetten. In het configuratie gedeelte van BGP hier wordt BGP zo ingesteld dat deze subnetten aan de buren bekend worden gemaakt.

Stap 3. Configureer FTD2 als tweede eindpunt.

• Objectnetwerk FTD2-Outside-IP bevat het externe interface-IP adres van FTD2.
• Exemplaren obj-172.16.1.0 en obj-172.16.2.0 bevatten respectievelijk 172.16.1.0/24 en 172.16.2.0/24. VPN-verkeer wordt gegenereerd vanuit deze subnetten. In het configuratie gedeelte van BGP hier wordt BGP zo ingesteld dat deze subnetten aan de buren bekend worden gemaakt.

Stap 4. Configureer de IKE-parameters.

1. Configureer het IKEv2-beleid.
2. Configureer de verificatiemethode (PSK/certificaatmodel).

Stap 5. Configureer de gewenste IPSec-parameters.

1. Crypto kaarttype configureren (Statisch of Dynamisch)
2. IKEv2-modus (Tunnel of transport) configureren
3. IPSec-voorstellen configureren
4. Perfect voorwaartse geheimen inschakelen (optioneel)
5. Injectie omgekeerd pad inschakelen (optioneel)

Stap 6. Configureer geavanceerde instellingen indien nodig.

BGP configureren

Dit is de procedure om FTD1 en FTD2 te configureren.

Onder Apparaatbeheer en selecteer het apparaat en navigeer vervolgens naar Routing > BGP.

1. Schakel BGP in en stel het Autonomous System (AS) nummer in, zoals in deze afbeelding.

2. Navigeer naar BGP > IPv4 en stel BGP IPv4 in op de FTD, zoals in deze afbeelding getoond.

3. Voeg onder het tabblad Buren de andere FTD toe als buurman en laat de buur toe, zoals in deze afbeelding.

4. Voeg onder het tabblad Netwerken de netwerken toe die u via BGP wilt adverteren.

5. Alle andere BGP-instellingen zijn optioneel en u kunt deze in uw eigen omgeving configureren.

Definitieve configuratie van beide apparaten

FTD1

!--- FTD Version ---!

ftd1# show version
----------------------[ ftd1 ]----------------------
Model                     : Cisco Firepower Threat Defense for VMWare (75) Version 6.4.0.7 (Build 53)
UUID                      : cbd4966c-daf4-11ea-8637-c8977622bc2d
Rules update version      : 2018-10-10-001-vrt
VDB version               : 309
----------------------------------------------------
Cisco Adaptive Security Appliance Software Version 9.12(2)151 


!--- Configure the Inside and outside interface ---!

interface GigabitEthernet0/0
 nameif outside
 cts manual
  propagate sgt preserve-untag
  policy static sgt disabled trusted
 security-level 0
 ip address 192.0.2.1 255.255.255.0
!
interface GigabitEthernet0/1
 nameif inside
 cts manual
  propagate sgt preserve-untag
  policy static sgt disabled trusted
 security-level 0
 ip address 10.1.1.1 255.255.255.0 


!--- Configure VPN ---!
!--- Configure IPSec Policy ---!
crypto ipsec ikev2 ipsec-proposal CSM_IP_1
protocol esp encryption des
protocol esp integrity sha-1


!--- Configure Crypto Map ---!
crypto map CSM_outside_map 1 match address CSM_IPSEC_ACL_2
crypto map CSM_outside_map 1 set peer 209.165.201.1
crypto map CSM_outside_map 1 set ikev2 ipsec-proposal CSM_IP_1
crypto map CSM_outside_map 1 set reverse-route


!--- Apply the Crypto Map to the outside interface ---!

crypto map CSM_outside_map interface outside


!--- Configure IKEv2 policy ---!
crypto ikev2 policy 80
encryption des
integrity sha
group 5
prf sha
lifetime seconds 86400


!--- Enable IKEv2 on the outside interface ---!

crypto ikev2 enable outside


!--- Configure BGP Router Process ---!

router bgp 100
bgp log-neighbor-changes
bgp router-id 10.127.248.35
address-family ipv4 unicast
neighbor 209.165.201.1 remote-as 100
neighbor 209.165.201.1 transport path-mtu-discovery disable
neighbor 209.165.201.1 activate
network 10.1.1.0 mask 255.255.255.0
network 10.1.2.0 mask 255.255.255.0
no auto-summary
no synchronization
exit-address-family
!


!--- Configure the necessary routes ---!

route outside 0.0.0.0 0.0.0.0 192.0.2.100 1
route inside 10.1.2.0 255.255.255.0 10.1.1.100 1

FTD2

!--- FTD Version ---!

ftd2# show version
----------------------[ ftd2 ]----------------------
Model                     : Cisco Firepower Threat Defense for VMWare (75) Version 6.4.0.9 (Build 62)
UUID                      : 4ebe8e3a-dd8d-11ea-a599-a348a450d5ff
Rules update version      : 2018-10-10-001-vrt
VDB version               : 309
----------------------------------------------------
Cisco Adaptive Security Appliance Software Version 9.12(2)33 


!--- Configure the Inside and outside interface ---!

interface GigabitEthernet0/0
 nameif outside
 cts manual
  propagate sgt preserve-untag
  policy static sgt disabled trusted
 security-level 0
 ip address 209.165.201.1 255.255.255.0
!
interface GigabitEthernet0/1
 nameif inside
 cts manual
  propagate sgt preserve-untag
  policy static sgt disabled trusted
 security-level 0
 ip address 172.16.1.1 255.255.255.0 


 !--- Configure VPN ---!
 !--- Configure IPSec Policy ---!

crypto ipsec ikev2 ipsec-proposal CSM_IP_1
protocol esp encryption des
protocol esp integrity sha-1


!--- Configure Crypto Map ---!

crypto map CSM_outside_map 2 match address CSM_IPSEC_ACL_2
crypto map CSM_outside_map 2 set peer 192.0.2.1
crypto map CSM_outside_map 2 set ikev2 ipsec-proposal CSM_IP_1
crypto map CSM_outside_map 2 set reverse-route


!--- Apply the Crypto Map to the outside interface ---!

crypto map CSM_outside_map interface outside


!--- Configure IKEv2 policy ---!

crypto ikev2 policy 80
encryption des
integrity sha
group 5
prf sha
lifetime seconds 86400


!--- Enable IKEv2 on the outside interface ---!

crypto ikev2 enable outside


!--- Configure BGP Router Process ---!

router bgp 100
bgp log-neighbor-changes
bgp router-id 10.127.248.36
address-family ipv4 unicast
neighbor 192.0.2.1 remote-as 100
neighbor 192.0.2.1 transport path-mtu-discovery disable
neighbor 192.0.2.1 activate
network 172.16.1.0 mask 255.255.255.0
network 172.16.2.0 mask 255.255.255.0
no auto-summary
no synchronization
exit-address-family


!--- Configure the necessary routes ---!

route outside 0.0.0.0 0.0.0.0 209.165.201.100 1
route inside 172.16.2.0 255.255.255.0 172.16.1.100 1

Verifiëren

FTD1

!--- Check the IKEv2 sa with remote peer ---!

ftd1# show crypto ikev2 sa

IKEv2 SAs:

Session-id:34, Status:UP-ACTIVE, IKE count:1, CHILD count:1

Tunnel-id Local Remote Status Role
315310279 192.0.2.1/500 209.165.201.1/500 READY INITIATOR
Encr: DES, Hash: SHA96, DH Grp:5, Auth sign: PSK, Auth verify: PSK
Life/Active Time: 86400/32514 sec
Child sa: local selector 192.0.2.1/0 - 192.0.2.1/65535
remote selector 209.165.201.1/0 - 209.165.201.1/65535
ESP spi in/out: 0xd8ba0545/0x4b6beb6c


!--- Check the IPSec sa with remote peer and check the number of encrypts and decrypts---!

ftd1# show crypto ipsec sa
interface: outside
Crypto map tag: CSM_outside_map, seq num: 1, local addr: 192.0.2.1

access-list CSM_IPSEC_ACL_2 extended permit ip host 192.0.2.1 host 209.165.201.1
local ident (addr/mask/prot/port): (192.0.2.1/255.255.255.255/0/0)
remote ident (addr/mask/prot/port): (209.165.201.1/255.255.255.255/0/0)
current_peer: 209.165.201.1


#pkts encaps: 1110, #pkts encrypt: 1110, #pkts digest: 1110
#pkts decaps: 1111, #pkts decrypt: 1111, #pkts verify: 1111
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 1110, #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
#TFC rcvd: 0, #TFC sent: 0
#Valid ICMP Errors rcvd: 0, #Invalid ICMP Errors rcvd: 0
#send errors: 0, #recv errors: 0

local crypto endpt.: 192.0.2.1/500, remote crypto endpt.: 209.165.201.1/500
path mtu 1500, ipsec overhead 58(36), media mtu 1500
PMTU time remaining (sec): 0, DF policy: copy-df
ICMP error validation: disabled, TFC packets: disabled
current outbound spi: 4B6BEB6C
current inbound spi : D8BA0545

inbound esp sas:
spi: 0xD8BA0545 (3636069701)
SA State: active
transform: esp-des esp-sha-hmac no compression
in use settings ={L2L, Tunnel, IKEv2, }
slot: 0, conn_id: 1515, crypto-map: CSM_outside_map
sa timing: remaining key lifetime (kB/sec): (4101105/21619)
IV size: 8 bytes
replay detection support: Y
Anti replay bitmap:
0xFFFFFFFF 0xFFFFFFFF
outbound esp sas:
spi: 0x4B6BEB6C (1265363820)
SA State: active
transform: esp-des esp-sha-hmac no compression
in use settings ={L2L, Tunnel, IKEv2, }
slot: 0, conn_id: 1515, crypto-map: CSM_outside_map
sa timing: remaining key lifetime (kB/sec): (4239345/21619)
IV size: 8 bytes
replay detection support: Y
Anti replay bitmap:
0x00000000 0x00000001


!--- Check the BGP router summary ---!

ftd1# show bgp summary
BGP router identifier 10.127.248.35, local AS number 100
BGP table version is 43, main routing table version 43
4 network entries using 800 bytes of memory
4 path entries using 320 bytes of memory
2/2 BGP path/bestpath attribute entries using 416 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 1536 total bytes of memory
BGP activity 20/16 prefixes, 26/22 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
209.165.201.1 4 100 494 488 43 0 0 09:01:15 2


!--- Check the BGP neighborship ---!

ftd1# show bgp neighbors

BGP neighbor is 209.165.201.1, context single_vf, remote AS 100, internal link
BGP version 4, remote router ID 10.127.248.36
BGP state = Established, up for 09:01:18
Last read 00:00:52, last write 00:00:12, hold time is 180, keepalive interval is 60 seconds
Neighbor sessions:
1 active, is not multisession capable (disabled)
Neighbor capabilities:
Route refresh: advertised and received(new)
Four-octets ASN Capability: advertised and received
Address family IPv4 Unicast: advertised and received
Multisession Capability:
Message statistics:
InQ depth is 0
OutQ depth is 0

Sent Rcvd
Opens: 1 1
Notifications: 0 0
Updates: 3 3
Keepalives: 484 490
Route Refresh: 0 0
Total: 488 494
Default minimum time between advertisement runs is 0 seconds

For address family: IPv4 Unicast
Session: 209.165.201.1
BGP table version 43, neighbor version 43/0
Output queue size : 0
Index 19
19 update-group member
Sent Rcvd
Prefix activity: ---- ----
Prefixes Current: 2 2 (Consumes 160 bytes)
Prefixes Total: 2 2
Implicit Withdraw: 0 0
Explicit Withdraw: 0 0
Used as bestpath: n/a 2
Used as multipath: n/a 0

Outbound Inbound
Local Policy Denied Prefixes: -------- -------
Bestpath from this peer: 2 n/a
Invalid Path: 1 n/a
Total: 3 0
Number of NLRIs in the update sent: max 1, min 0

Address tracking is enabled, the RIB does have a route to 209.165.201.1
Connections established 2; dropped 1
Last reset 09:01:34, due to Peer closed the session of session 1
Transport(tcp) path-mtu-discovery is disabled
Graceful-Restart is disabled


!--- Check the routes learned from BGP ---!

ftd1# sh route bgp

Codes: L - local, C - connected, S - static, 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, V - VPN
i - IS-IS, su - IS-IS summary, 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, + - replicated route
Gateway of last resort is 192.0.2.100 to network 0.0.0.0

B 172.16.1.0 255.255.255.0 [200/0] via 209.165.201.1, 00:00:57
B 172.16.2.0 255.255.255.0 [200/0] via 172.16.1.100, 09:01:23

FTD2

!--- Check the IKEv2 sa with remote peer ---!


ftd2# show crypto ikev2 sa

IKEv2 SAs:

Session-id:34, Status:UP-ACTIVE, IKE count:1, CHILD count:1

Tunnel-id Local Remote Status Role
862624945 209.165.201.1/500 192.0.2.1/500 READY RESPONDER
Encr: DES, Hash: SHA96, DH Grp:5, Auth sign: PSK, Auth verify: PSK
Life/Active Time: 86400/32429 sec
Child sa: local selector 209.165.201.1/0 - 209.165.201.1/65535
remote selector 192.0.2.1/0 - 192.0.2.1/65535
ESP spi in/out: 0x4b6beb6c/0xd8ba0545


!--- Check the IPSec sa with remote peer and check the number of encrypts and decrypts---!


ftd2# show crypto ipsec sa
interface: outside
Crypto map tag: CSM_outside_map, seq num: 2, local addr: 209.165.201.1

access-list CSM_IPSEC_ACL_2 extended permit ip host 209.165.201.1 host 192.0.2.1
local ident (addr/mask/prot/port): (209.165.201.1/255.255.255.255/0/0)
remote ident (addr/mask/prot/port): (192.0.2.1/255.255.255.255/0/0)
current_peer: 192.0.2.1


#pkts encaps: 1107, #pkts encrypt: 1107, #pkts digest: 1107
#pkts decaps: 1106, #pkts decrypt: 1106, #pkts verify: 1106
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 1107, #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
#TFC rcvd: 0, #TFC sent: 0
#Valid ICMP Errors rcvd: 0, #Invalid ICMP Errors rcvd: 0
#send errors: 0, #recv errors: 0

local crypto endpt.: 209.165.201.1/500, remote crypto endpt.: 192.0.2.1/500
path mtu 1500, ipsec overhead 58(36), media mtu 1500
PMTU time remaining (sec): 0, DF policy: copy-df
ICMP error validation: disabled, TFC packets: disabled
current outbound spi: D8BA0545
current inbound spi : 4B6BEB6C

inbound esp sas:
spi: 0x4B6BEB6C (1265363820)
SA State: active
transform: esp-des esp-sha-hmac no compression
in use settings ={L2L, Tunnel, IKEv2, }
slot: 0, conn_id: 1516, crypto-map: CSM_outside_map
sa timing: remaining key lifetime (kB/sec): (4008945/21713)
IV size: 8 bytes
replay detection support: Y
Anti replay bitmap:
0xFFFFFFFF 0xFFFFFFFF
outbound esp sas:
spi: 0xD8BA0545 (3636069701)
SA State: active
transform: esp-des esp-sha-hmac no compression
in use settings ={L2L, Tunnel, IKEv2, }
slot: 0, conn_id: 1516, crypto-map: CSM_outside_map
sa timing: remaining key lifetime (kB/sec): (4239345/21713)
IV size: 8 bytes
replay detection support: Y
Anti replay bitmap:
0x00000000 0x00000001

 
!--- Check the BGP router summary ---!

ftd2# show bgp summary
BGP router identifier 10.127.248.36, local AS number 100
BGP table version is 44, main routing table version 44
3 network entries using 600 bytes of memory
3 path entries using 240 bytes of memory
2/2 BGP path/bestpath attribute entries using 416 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 1256 total bytes of memory
BGP activity 20/17 prefixes, 26/23 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
192.0.2.1 4 100 486 492 44 0 0 08:59:40 2


!--- Check the BGP neighborship ---!


ftd2# show bgp neighbors

BGP neighbor is 192.0.2.1, context single_vf, remote AS 100, internal link
BGP version 4, remote router ID 10.127.248.35
BGP state = Established, up for 08:59:42
Last read 00:00:53, last write 00:00:38, hold time is 180, keepalive interval is 60 seconds
Neighbor sessions:
1 active, is not multisession capable (disabled)
Neighbor capabilities:
Route refresh: advertised and received(new)
Four-octets ASN Capability: advertised and received
Address family IPv4 Unicast: advertised and received
Multisession Capability:
Message statistics:
InQ depth is 0
OutQ depth is 0

Sent Rcvd
Opens: 1 1
Notifications: 0 0
Updates: 2 3
Keepalives: 489 482
Route Refresh: 0 0
Total: 492 486
Default minimum time between advertisement runs is 0 seconds

For address family: IPv4 Unicast
Session: 192.0.2.1
BGP table version 44, neighbor version 44/0
Output queue size : 0
Index 19
19 update-group member
Sent Rcvd
Prefix activity: ---- ----
Prefixes Current: 1 2 (Consumes 160 bytes)
Prefixes Total: 1 2
Implicit Withdraw: 0 0
Explicit Withdraw: 0 0
Used as bestpath: n/a 2
Used as multipath: n/a 0

Outbound Inbound
Local Policy Denied Prefixes: -------- -------
Bestpath from this peer: 2 n/a
Invalid Path: 2 n/a
Total: 4 0
Number of NLRIs in the update sent: max 1, min 0

Address tracking is enabled, the RIB does have a route to 192.0.2.1
Connections established 2; dropped 1
Last reset 08:59:57, due to Peer closed the session of session 1
Transport(tcp) path-mtu-discovery is disabled
Graceful-Restart is disabled


!--- Check the routes learned from BGP ---!

ftd2# show route bgp

Codes: L - local, C - connected, S - static, 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, V - VPN
i - IS-IS, su - IS-IS summary, 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, + - replicated route
Gateway of last resort is 209.165.201.100 to network 0.0.0.0

B 10.1.1.0 255.255.255.0 [200/0] via 192.0.2.1, 08:59:46
B 10.1.2.0 255.255.255.0 [200/0] via 10.1.1.100, 08:59:46

Problemen oplossen

Er is momenteel geen specifieke troubleshooting-informatie beschikbaar voor deze configuratie.