DMVPN - IPv6 - VRF

Publié le par Lisa

In my today lab I will try to implement DMVPN with some additional features like VRF and IPv6. As you see in the below picture, routers can establish secure connection over ASA.

My basic ip/ipv6 configuration:

hub:

hostname R1 ! vrf definition GREEN ! address-family ipv6 exit-address-family ! ip vrf RED ! ipv6 unicast-routing ! interface Loopback100 vrf forwarding GREEN no ip address ipv6 address 2001:100::1/64 ! interface FastEthernet0/0 ip vrf forwarding RED ip address 5.5.5.1 255.255.255.0 speed auto duplex auto ! ip route vrf RED 0.0.0.0 0.0.0.0 5.5.5.2

next the spoke1:

hostname R2 ! vrf definition GREEN ! address-family ipv6 exit-address-family ! ip vrf RED ! ipv6 unicast-routing ! interface Loopback100 vrf forwarding GREEN no ip address ipv6 address 2001:200::2/64 ! interface FastEthernet0/0 ip vrf forwarding RED ip address 6.6.6.1 255.255.255.0 duplex auto speed auto ! ip route vrf RED 0.0.0.0 0.0.0.0 6.6.6.2

and the spoke2:

hostname R3 ! vrf definition GREEN ! address-family ipv6 exit-address-family ! ip vrf RED ! ipv6 unicast-routing ! interface Loopback100 vrf forwarding GREEN no ip address ipv6 address 2001:300::3/64 ipv6 enable ! interface FastEthernet0/0 ip vrf forwarding RED ip address 7.7.7.1 255.255.255.0 duplex auto speed auto ! ip route vrf RED 0.0.0.0 0.0.0.0 7.7.7.2

Let’s test the basic connectivity:

R1#ping vrf RED 6.6.6.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 6.6.6.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 60/64/68 ms R1# R1#ping vrf RED 7.7.7.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 7.7.7.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 28/68/108 ms R1#

ASA configuration:

! interface GigabitEthernet0 nameif spoke1 security-level 0 ip address 6.6.6.2 255.255.255.0 ! interface GigabitEthernet1 nameif spoke2 security-level 0 ip address 7.7.7.2 255.255.255.0 ! interface GigabitEthernet2 nameif inside security-level 100 ip address 5.5.5.2 255.255.255.0 !

Let’s start DMVPN part:

Hub:

! interface Tunnel0 vrf forwarding GREEN no ip address no ip redirects ipv6 address FE80::2001 link-local ipv6 address 2001:DB8:1:1::1/64 ipv6 nhrp authentication cisco123 ipv6 nhrp map multicast dynamic ipv6 nhrp network-id 100 tunnel source FastEthernet0/0 tunnel mode gre multipoint tunnel vrf RED !

spoke1:

! interface Tunnel0 vrf forwarding GREEN no ip address no ip redirects ipv6 address FE80::2002 link-local ipv6 address 2001:DB8:1:1::2/64 ipv6 nhrp authentication cisco123 ipv6 nhrp map multicast 5.5.5.1 ipv6 nhrp map 2001:DB8:1:1::1/64 5.5.5.1 ipv6 nhrp network-id 100 ipv6 nhrp nhs 2001:DB8:1:1::1 tunnel source FastEthernet0/0 tunnel mode gre multipoint tunnel vrf RED !

spoke2:

! interface Tunnel0 vrf forwarding GREEN no ip address no ip redirects ipv6 address FE80::2003 link-local ipv6 address 2001:DB8:1:1::3/64 ipv6 nhrp authentication cisco123 ipv6 nhrp map multicast 5.5.5.1 ipv6 nhrp map 2001:DB8:1:1::1/64 5.5.5.1 ipv6 nhrp network-id 100 ipv6 nhrp nhs 2001:DB8:1:1::1 tunnel source FastEthernet0/0 tunnel mode gre multipoint tunnel vrf RED !

On ASA I see following messages:

%ASA-3-106010: Deny inbound protocol 47 src spoke1:6.6.6.1 dst inside:5.5.5.1 %ASA-3-106010: Deny inbound protocol 47 src spoke2:7.7.7.1 dst inside:5.5.5.1

Let’s fix it:

access-list SPOKE1 ext permit gre host 6.6.6.1 host 5.5.5.1 access-group SPOKE1 in inter spoke1 access-list SPOKE2 ext permit gre host 7.7.7.1 host 5.5.5.1 access-group SPOKE2 in inter spoke2

It works fine:

asa1(config)# sh conn 4 in use, 4 most used GRE spoke2 7.7.7.1:0 inside 5.5.5.1:0, idle 0:00:54, bytes 168, flags E GRE spoke1 6.6.6.1:0 inside 5.5.5.1:0, idle 0:01:22, bytes 168, flags E GRE spoke2 7.7.7.1:0 inside 5.5.5.1:0, idle 0:00:54, bytes 232, flags E GRE spoke1 6.6.6.1:0 inside 5.5.5.1:0, idle 0:01:22, bytes 232, flags E asa1(config)#

I check now DMVPN (unprotected yet) status on all peers:

1) hub

R1#sh dmvpn Legend: Attrb --> S - Static, D - Dynamic, I - Incomplete N - NATed, L - Local, X - No Socket # Ent --> Number of NHRP entries with same NBMA peer NHS Status: E --> Expecting Replies, R --> Responding, W --> Waiting UpDn Time --> Up or Down Time for a Tunnel ========================================================================== Interface: Tunnel0, IPv6 NHRP Details Type:Hub, Total NBMA Peers (v4/v6): 2 1.Peer NBMA Address: 6.6.6.1 Tunnel IPv6 Address: 2001:DB8:1:1::2 IPv6 Target Network: 2001:DB8:1:1::2/128 # Ent: 1, Status: UP, UpDn Time: 00:00:20, Cache Attrib: D 2.Peer NBMA Address: 7.7.7.1 Tunnel IPv6 Address: 2001:DB8:1:1::3 IPv6 Target Network: 2001:DB8:1:1::3/128 # Ent: 1, Status: UP, UpDn Time: 00:02:47, Cache Attrib: D R1# R1#sh dmvpn detail Legend: Attrb --> S - Static, D - Dynamic, I - Incomplete N - NATed, L - Local, X - No Socket # Ent --> Number of NHRP entries with same NBMA peer NHS Status: E --> Expecting Replies, R --> Responding, W --> Waiting UpDn Time --> Up or Down Time for a Tunnel ========================================================================== Interface Tunnel0 is up/up, Addr. is 2001:DB8:1:1::1, VRF "GREEN" Tunnel Src./Dest. addr: 5.5.5.1/MGRE, Tunnel VRF "RED" Protocol/Transport: "multi-GRE/IP", Protect "" Interface State Control: Disabled nhrp event-publisher : Disabled Type:Hub, Total NBMA Peers (v4/v6): 2 1.Peer NBMA Address: 6.6.6.1 Tunnel IPv6 Address: 2001:DB8:1:1::2 IPv6 Target Network: 2001:DB8:1:1::2/128 # Ent: 2, Status: UP, UpDn Time: 00:05:06, Cache Attrib: D 2.Peer NBMA Address: 6.6.6.1 Tunnel IPv6 Address: 2001:DB8:1:1::2 IPv6 Target Network: FE80::2002/128 # Ent: 0, Status: UP, UpDn Time: 00:05:06, Cache Attrib: D 3.Peer NBMA Address: 7.7.7.1 Tunnel IPv6 Address: 2001:DB8:1:1::3 IPv6 Target Network: 2001:DB8:1:1::3/128 # Ent: 2, Status: UP, UpDn Time: 00:07:33, Cache Attrib: D 4.Peer NBMA Address: 7.7.7.1 Tunnel IPv6 Address: 2001:DB8:1:1::3 IPv6 Target Network: FE80::2003/128 # Ent: 0, Status: UP, UpDn Time: 00:07:33, Cache Attrib: D Crypto Session Details: -------------------------------------------------------------------------------- Pending DMVPN Sessions: R1#

2) spoke1

R2#sh dmvpn Legend: Attrb --> S - Static, D - Dynamic, I - Incomplete N - NATed, L - Local, X - No Socket # Ent --> Number of NHRP entries with same NBMA peer NHS Status: E --> Expecting Replies, R --> Responding, W --> Waiting UpDn Time --> Up or Down Time for a Tunnel ========================================================================== Interface: Tunnel0, IPv6 NHRP Details Type:Spoke, Total NBMA Peers (v4/v6): 1 1.Peer NBMA Address: 5.5.5.1 Tunnel IPv6 Address: 2001:DB8:1:1::1 IPv6 Target Network: 2001:DB8:1:1::/64 # Ent: 1, Status: UP, UpDn Time: 00:02:59, Cache Attrib: S R2# R2#sh dmvpn detail Legend: Attrb --> S - Static, D - Dynamic, I - Incomplete N - NATed, L - Local, X - No Socket # Ent --> Number of NHRP entries with same NBMA peer NHS Status: E --> Expecting Replies, R --> Responding, W --> Waiting UpDn Time --> Up or Down Time for a Tunnel ========================================================================== Interface Tunnel0 is up/up, Addr. is 2001:DB8:1:1::2, VRF "GREEN" Tunnel Src./Dest. addr: 6.6.6.1/MGRE, Tunnel VRF "RED" Protocol/Transport: "multi-GRE/IP", Protect "" Interface State Control: Disabled nhrp event-publisher : Disabled IPv6 NHS: 2001:DB8:1:1::1 RE priority = 0 cluster = 0 Type:Spoke, Total NBMA Peers (v4/v6): 1 1.Peer NBMA Address: 5.5.5.1 Tunnel IPv6 Address: 2001:DB8:1:1::1 IPv6 Target Network: 2001:DB8:1:1::/64 # Ent: 2, Status: UP, UpDn Time: 00:04:37, Cache Attrib: S 2.Peer NBMA Address: 5.5.5.1 Tunnel IPv6 Address: FE80::2001 IPv6 Target Network: FE80::2001/128 # Ent: 0, Status: NHRP, UpDn Time: never, Cache Attrib: S Crypto Session Details: -------------------------------------------------------------------------------- Pending DMVPN Sessions: R2#

3) spoke2

R3#sh dmvpn Legend: Attrb --> S - Static, D - Dynamic, I - Incomplete N - NATed, L - Local, X - No Socket # Ent --> Number of NHRP entries with same NBMA peer NHS Status: E --> Expecting Replies, R --> Responding, W --> Waiting UpDn Time --> Up or Down Time for a Tunnel ========================================================================== Interface: Tunnel0, IPv6 NHRP Details Type:Spoke, Total NBMA Peers (v4/v6): 1 1.Peer NBMA Address: 5.5.5.1 Tunnel IPv6 Address: 2001:DB8:1:1::1 IPv6 Target Network: 2001:DB8:1:1::/64 # Ent: 1, Status: UP, UpDn Time: 00:05:44, Cache Attrib: S R3# R3#sh dmvpn detail Legend: Attrb --> S - Static, D - Dynamic, I - Incomplete N - NATed, L - Local, X - No Socket # Ent --> Number of NHRP entries with same NBMA peer NHS Status: E --> Expecting Replies, R --> Responding, W --> Waiting UpDn Time --> Up or Down Time for a Tunnel ========================================================================== Interface Tunnel0 is up/up, Addr. is 2001:DB8:1:1::3, VRF "GREEN" Tunnel Src./Dest. addr: 7.7.7.1/MGRE, Tunnel VRF "RED" Protocol/Transport: "multi-GRE/IP", Protect "" Interface State Control: Disabled nhrp event-publisher : Disabled IPv6 NHS: 2001:DB8:1:1::1 RE priority = 0 cluster = 0 Type:Spoke, Total NBMA Peers (v4/v6): 1 1.Peer NBMA Address: 5.5.5.1 Tunnel IPv6 Address: 2001:DB8:1:1::1 IPv6 Target Network: 2001:DB8:1:1::/64 # Ent: 2, Status: UP, UpDn Time: 00:06:16, Cache Attrib: S 2.Peer NBMA Address: 5.5.5.1 Tunnel IPv6 Address: FE80::2001 IPv6 Target Network: FE80::2001/128 # Ent: 0, Status: NHRP, UpDn Time: never, Cache Attrib: S Crypto Session Details: -------------------------------------------------------------------------------- Pending DMVPN Sessions: R3#

I check now the NHRP status and as you see below the NHRP mappings is done for link-local address too:

1) hub

R1#sh ipv6 nhrp 2001:DB8:1:1::2/128 via 2001:DB8:1:1::2 Tunnel0 created 00:10:16, expire 01:50:19 Type: dynamic, Flags: unique registered used NBMA address: 6.6.6.1 2001:DB8:1:1::3/128 via 2001:DB8:1:1::3 Tunnel0 created 00:12:08, expire 01:47:51 Type: dynamic, Flags: unique registered used NBMA address: 7.7.7.1 FE80::2002/128 via 2001:DB8:1:1::2 Tunnel0 created 00:09:41, expire 01:50:19 Type: dynamic, Flags: unique registered NBMA address: 6.6.6.1 FE80::2003/128 via 2001:DB8:1:1::3 Tunnel0 created 00:12:08, expire 01:47:51 Type: dynamic, Flags: unique registered NBMA address: 7.7.7.1 R1# R1#sh ipv6 nhrp multicast I/F NBMA address Tunnel0 7.7.7.1 Flags: dynamic Tunnel0 6.6.6.1 Flags: dynamic R1#

2) spoke1

R2#sh ipv6 nhrp 2001:DB8:1:1::/64 via 2001:DB8:1:1::1 Tunnel0 created 00:11:48, never expire Type: static, Flags: used NBMA address: 5.5.5.1 FE80::2001/128 via FE80::2001 Tunnel0 created 00:11:47, never expire Type: static, Flags: NBMA address: 5.5.5.1 R2# R2#sh ipv6 nhrp multicast I/F NBMA address Tunnel0 5.5.5.1 Flags: static R2#

3) spoke2

R3#sh ipv6 nhrp 2001:DB8:1:1::/64 via 2001:DB8:1:1::1 Tunnel0 created 00:33:06, never expire Type: static, Flags: used NBMA address: 5.5.5.1 FE80::2001/128 via FE80::2001 Tunnel0 created 00:14:56, never expire Type: static, Flags: NBMA address: 5.5.5.1 R3# R3#sh ipv6 nhrp multicast I/F NBMA address Tunnel0 5.5.5.1 Flags: static R3#

Let’s test ipv6 connectivity:

R1#ping vrf GREEN ipv6 2001:DB8:1:1::2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:DB8:1:1::2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 152/157/168 ms R1# R1#ping vrf GREEN ipv6 2001:DB8:1:1::3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:DB8:1:1::3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 124/146/160 ms R1#

Now my peers need to learn about their LAN’s. I will static routes:

R1:

ipv6 route vrf GREEN 2001:200::/64 Tunnel0 2001:DB8:1:1::2 ipv6 route vrf GREEN 2001:300::/64 Tunnel0 2001:DB8:1:1::3

R2:

ipv6 route vrf GREEN 2001:100::/64 Tunnel0 2001:DB8:1:1::1 ipv6 route vrf GREEN 2001:300::/64 Tunnel0 2001:DB8:1:1::3

R3:

ipv6 route vrf GREEN 2001:100::/64 Tunnel0 2001:DB8:1:1::1 ipv6 route vrf GREEN 2001:200::/64 Tunnel0 2001:DB8:1:1::2

As you see the IPv6 routing works fine:

R1#ping vrf GREEN ipv6 2001:200::2 source loop100 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:200::2, timeout is 2 seconds: Packet sent with a source address of 2001:100::1%GREEN !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 136/148/152 ms R1# R1# R1#ping vrf GREEN ipv6 2001:300::3 source loop100 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:300::3, timeout is 2 seconds: Packet sent with a source address of 2001:100::1%GREEN !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 140/169/224 ms R1#

As you see the DMVPN works in the phase 1:

R2#traceroute vrf GREEN ipv6 2001:300::3 Type escape sequence to abort. Tracing the route to 2001:300::3 1 2001:DB8:1:1::1 128 msec 124 msec 136 msec 2 2001:DB8:1:1::3 252 msec 172 msec 236 msec R2#

The last step is adding the IPsec. Because we have two VRFs here I need to start with a keyring:

crypto keyring KEYRING vrf RED pre-shared-key address 0.0.0.0 0.0.0.0 key cisco123

then VRF-aware ISAKMP profile:

crypto isakmp profile ISAKMP-PROFILE keyring KEYRING match identity address 0.0.0.0 RED

basic isakmp and ipsec policy:

crypto isakmp policy 10 encr 3des authentication pre-share group 2 ! crypto ipsec transform-set TS esp-3des esp-sha-hmac

and then IPsec profile:

crypto ipsec profile IPSEC-PROFILE set transform-set TS set isakmp-profile ISAKMP-PROFILE

and next I apply the profile on the tunnel interface:

interface tunnel0 tunnel protection ipsec profile IPSEC-PROFILE

I enable debug to see what is going on:

R1#debug crypto isakmp Crypto ISAKMP debugging is on R1# *Jan 6 01:05:03.353: ISAKMP (1002): received packet from 6.6.6.1 dport 500 sport 500 RED (R) QM_IDLE *Jan 6 01:05:03.357: ISAKMP:(1002):deleting node 1192631245 error FALSE reason "QM done (await)" *Jan 6 01:05:03.357: ISAKMP:(1002):Node 1192631245, Input = IKE_MESG_FROM_PEER, IKE_QM_EXCH *Jan 6 01:05:03.361: ISAKMP:(1002):Old State = IKE_QM_R_QM2 New State = IKE_QM_PHASE2_COMPLETE *Jan 6 01:05:04.025: ISAKMP:(0): retransmitting phase 1 MM_NO_STATE... *Jan 6 01:05:04.025: ISAKMP (0): incrementing error counter on sa, attempt 1 of 5: retransmit phase 1 *Jan 6 01:05:04.029: ISAKMP:(0): retransmitting phase 1 MM_NO_STATE R1# *Jan 6 01:05:04.029: ISAKMP:(0): sending packet to 7.7.7.1 my_port 500 peer_port 500 (I) MM_NO_STATE *Jan 6 01:05:04.033: ISAKMP:(0):Sending an IKE IPv4 Packet. R1#

Hm, I think I have to check my ASA:

%ASA-4-106023: Deny udp src spoke1:6.6.6.1/500 dst inside:5.5.5.1/500 by access-group "SPOKE1" [0x0, 0x0] %ASA-4-106023: Deny icmp src spoke2:7.7.7.1 dst inside:5.5.5.1 (type 3, code 3) by access-group "SPOKE2" [0x0, 0x0] %ASA-4-106023: Deny protocol 50 src spoke1:6.6.6.1 dst inside:5.5.5.1 by access-group "SPOKE1" [0x0, 0x0] %ASA-4-106023: Deny protocol 50 src spoke1:6.6.6.1 dst inside:5.5.5.1 by access-group "SPOKE1" [0x0, 0x0] %ASA-4-106023: Deny protocol 50 src spoke1:6.6.6.1 dst inside:5.5.5.1 by access-group "SPOKE1" [0x0, 0x0] %ASA-4-106023: Deny protocol 50 src spoke1:6.6.6.1 dst inside:5.5.5.1 by access-group "SPOKE1" [0x0, 0x0] %ASA-4-106023: Deny icmp src spoke2:7.7.7.1 dst inside:5.5.5.1 (type 3, code 3) by access-group "SPOKE2" [0x0, 0x0]

At the moment only GRE is allowed and I have to add UDP/500 and ESP:

access-list SPOKE1 ext permit udp host 6.6.6.1 host 5.5.5.1 eq 500 access-list SPOKE1 ext permit esp host 6.6.6.1 host 5.5.5.1 access-list SPOKE2 ext permit udp host 7.7.7.1 host 5.5.5.1 eq 500 access-list SPOKE2 ext permit esp host 7.7.7.1 host 5.5.5.1

I found one mistake in my config -> missing IVRF:

R2#sh crypto session detail Crypto session current status Code: C - IKE Configuration mode, D - Dead Peer Detection K - Keepalives, N - NAT-traversal, T - cTCP encapsulation X - IKE Extended Authentication, F - IKE Fragmentation Interface: Tunnel0 Profile: ISAKMP-PROFILE Uptime: 00:01:00 Session status: UP-ACTIVE Peer: 5.5.5.1 port 500 fvrf: RED ivrf: (none) Phase1_id: 5.5.5.1 Desc: (none) IKEv1 SA: local 6.6.6.1/500 remote 5.5.5.1/500 Active Capabilities:(none) connid:1003 lifetime:23:58:58 IPSEC FLOW: permit 47 host 6.6.6.1 host 5.5.5.1 Active SAs: 4, origin: crypto map Inbound: #pkts dec'ed 1 drop 0 life (KB/Sec) 4342102/3540 Outbound: #pkts enc'ed 2 drop 0 life (KB/Sec) 4342102/3540 R2#

but when I tried to add the GREEN VRF under ISAKMP profile I found I can’t:

R1#conf t Enter configuration commands, one per line. End with CNTL/Z. R1(config)#crypto isakmp profile ISAKMP-PROFILE R1(conf-isa-prof)# R1(conf-isa-prof)#vrf GREEN % vrf GREEN not configured R1(conf-isa-prof)#do sh run | i vrf vrf definition GREEN ip vrf RED ... R1(conf-isa-prof)# R1(conf-isa-prof)#exit

I used the new command because it has to work with IPv6 but ISAKMP profile isn’t compatible with the command.

From Cisco doc:

If the IKEv2 profile is used for tunnel protection, the Inside VRF (IVRF) for the tunnel interface should be configured on the tunnel interface.

I try do the same on ISAKMP (no IVRF on ISAKMP profile).

As you see there is connection between Loop100 (vrf GREEN):

R2#ping vrf GREEN ipv6 2001:100::1 source loop100 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:100::1, timeout is 2 seconds: Packet sent with a source address of 2001:200::2%GREEN .!!!! Success rate is 80 percent (4/5), round-trip min/avg/max = 120/129/140 ms R2#

but you can’t see the IVRF here:

R1#sh crypto session detail Crypto session current status Code: C - IKE Configuration mode, D - Dead Peer Detection K - Keepalives, N - NAT-traversal, T - cTCP encapsulation X - IKE Extended Authentication, F - IKE Fragmentation Interface: Tunnel0 Session status: DOWN Peer: 7.7.7.1 port 500 fvrf: RED ivrf: (none) Desc: (none) Phase1_id: (none) IPSEC FLOW: permit 47 host 5.5.5.1 host 7.7.7.1 Active SAs: 0, origin: crypto map Inbound: #pkts dec'ed 0 drop 0 life (KB/Sec) 0/0 Outbound: #pkts enc'ed 0 drop 0 life (KB/Sec) 0/0 Interface: Tunnel0 Profile: ISAKMP-PROFILE Uptime: 00:08:33 Session status: UP-ACTIVE Peer: 6.6.6.1 port 500 fvrf: RED ivrf: (none) Phase1_id: 6.6.6.1 Desc: (none) IKEv1 SA: local 5.5.5.1/500 remote 6.6.6.1/500 Active Capabilities:(none) connid:1001 lifetime:23:51:16 IPSEC FLOW: permit 47 host 5.5.5.1 host 6.6.6.1 Active SAs: 2, origin: crypto map Inbound: #pkts dec'ed 17 drop 3 life (KB/Sec) 4292794/3086 Outbound: #pkts enc'ed 17 drop 0 life (KB/Sec) 4292795/3086 R1#

Be aware the line is incorrect:

Peer: 6.6.6.1 port 500 fvrf: RED ivrf: (none)

and to check the real VRF you need to check configuration or:

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