Proof of encryption for the DMVPN Tunnel

I've been setting up VPN for a short time and Im trying to get a better

understanding of mechanics.

I configured DMVPN between a router HQ and two branches. Im running eigrp between routers by gre tunnel interfaces. I can see neighbors eigrp via the tunnel which is good. The part is Im trying to understand, I have not created any ACL and I seem to form relationships neighbor eigrp in the tunnels. If I ping or telnet from the HQ router to one of the branches, I assume that Im going through the tunnel and the traffic is encrypted. I would like to be able to prove and to see evidence.

I have to have ACL is configured to tell the router what to encrypt? Or the fact that the tunnel has a profile applied crypto doesn't take care of it?

I did a test and telneted from Headquarters to Division 1 to aid private addresses that were sent through the tunnel and then entered the command

SH crypto ipsec his. My telnet source address is the closure of the router which is 172.22.3.1 I though I'd see 172.22.3.1 or 172.22.1.1 in the out command has turned down and I do not have that make me wonder if the traffic is being encryption. Maybe my configs are incorrect or I need a different show command?

I have attached my router configs also. If someone could help understand me a little more it would be appreciated.

Andy

Lab-HQ-rtr #telnet 172.22.1.1 it's Branch1rtr
172.22.1.1 by train... Open

User access audit

Username: andrewb
Password:

Lab-branch1-rtr #sh crypto ipsec his

Interface: Tunnel0
Tag crypto map: addr Tunnel0-head-0, local 50.50.50.1

protégé of the vrf: (none)
local ident (addr, mask, prot, port): (50.50.50.1/255.255.255.255/47/0) * thought I'd see the src and dst the telnet address *

Remote ident (addr, mask, prot, port): (50.50.50.3/255.255.255.255/47/0)
current_peer 50.50.50.3 port 500
LICENCE, flags is {origin_is_acl},
#pkts program: 14307, #pkts encrypt: 14307, #pkts digest: 14307
#pkts decaps: 14286, #pkts decrypt: 14286, #pkts check: 14286
compressed #pkts: 0, unzipped #pkts: 0
#pkts uncompressed: 0, #pkts compr. has failed: 0
#pkts not unpacked: 0, #pkts decompress failed: 0
#send 24, #recv errors 0

local crypto endpt. : 50.50.50.1, remote Start crypto. : 50.50.50.3
Path mtu 1500, mtu 1500 ip, ip mtu IDB Serial0/0/0
current outbound SPI: 0x61D48BA8 (1641319336)

SAS of the esp on arrival:
SPI: 0x555FD9F (89521567)
transform: esp-3des esp-sha-hmac.
running parameters = {Transport}
Conn ID: 2037, flow_id: VPN:37 on board, card crypto: head-Tunnel0-0
calendar of his: service life remaining (k/s) key: (4598507/3044)
Size IV: 8 bytes
support for replay detection: Y
Status: ACTIVE

the arrival ah sas:

SAS of the CFP on arrival:

outgoing esp sas:
SPI: 0x61D48BA8 (1641319336)
transform: esp-3des esp-sha-hmac.
running parameters = {Transport}
Conn ID: 2038, flow_id: VPN:38 on board, card crypto: head-Tunnel0-0
calendar of his: service life remaining (k/s) key: (4598507/3033)
Size IV: 8 bytes
support for replay detection: Y
Status: ACTIVE

outgoing ah sas:

outgoing CFP sas:
Lab-branch1-rtr #.

Lab-HQ-rtr #sh ip route
C 50.50.50.0 is directly connected, Serial0/0/0
172.22.0.0/16 is variably divided into subnets, 4 subnets, 2 masks
C 172.22.3.1/32 is directly connected, Loopback0
D 172.22.2.1/32 [90/2944000] via 192.168.254.2, 21:18:04, Tunnel0
D 172.22.1.1/32 [90/2944000] via 192.168.254.1, 21:19, Tunnel0
D 172.22.64.32/27 [90/2816256] via 192.168.254.2, 21:18:04, Tunnel0
[90/2816256] via 192.168.254.1, 21:18:04, Tunnel0
10.0.0.0/24 is divided into subnets, 5 subnets
D 10.10.10.0 [90/2816256] via 192.168.254.1, 21:19, Tunnel0
D 10.10.20.0 [90/2816256] via 192.168.254.1, 21:19, Tunnel0
D 10.10.30.0 [90/2816256] via 192.168.254.2, 21:18:04, Tunnel0
D 10.10.40.0 [90/2816256] via 192.168.254.2, 21:18:04, Tunnel0
D 10.10.50.0 [90/2816256] via 192.168.254.1, 21:19:02, Tunnel0
C 192.168.254.0/24 is directly connected, Tunnel0
C 192.168.1.0/24 is directly connected, FastEthernet0/0

IPv4 Crypto ISAKMP Security Association
status of DST CBC State conn-id slot
50.50.50.3 50.50.50.2 QM_IDLE 1002 ASSETS 0
50.50.50.3 50.50.50.1 QM_IDLE 1001 ASSETS 0

Hi Andy,.

DMVPN will use routing to control this traffic will be encrypted. You can add ACLs as the regular crypto-plan to specify the traffic of interest, but which is not must have.

When the traffic leaving the router, it will do the routing research first; If the next hop points on your tunnel interface and the traffic is encapsulated and encrypted; If the next hop points to another interface, the traffic will leave the router without encryption.

ISAKMP SAs are built between your tunnel end points, as see you in the output of "show isakmp crypto his." You can check the traffic was encrypted or not by looking at the
#pkts program: 14307, #pkts encrypt: 14307, #pkts digest: 14307
#pkts decaps: 14286, #pkts decrypt: 14286, #pkts check: 14286

If you really want to see the package, you can EXTEND it to a monitor station traffic.

HTH,

Lei Tian

Tags: Cisco Security

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