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So this is a lab setup I practiced DMVPN with EIGRP below I have the configuration if you want to follow what I have done.

Static routes were used for the basic connectivity then EIGRP was used to build the DMVPN. I highly recommend that if you have very little experience with this kind of configuration to first do some reading or viewing some videos on YouTube.

Below is some of the configuration used:

MVPN Crypto config hub

crypto isakmp policy 1  authentication pre-share  encryption aes  hash sha  group 5  lifetime 1800  exit  crypto isakmp key 0 cisco address 102.1.1.100  crypto isakmp key 0 cisco address 103.1.1.100  crypto isakmp key 0 cisco address 104.1.1.100  crypto ipsec transform-set t-set esp-aes esp-sha-hmac  mode transport  exit  crypto ipsec profile cisco  set transform-set t-set  exit

 **************************************************************  spoke

 crypto isakmp policy 1  authentication pre-share  encryption aes  hash sha  group 5  lifetime 1800  exit  crypto isakmp key 0 cisco address 101.1.1.100  crypto isakmp key 0 cisco address 103.1.1.100  crypto isakmp key 0 cisco address 104.1.1.100  crypto ipsec transform-set t-set esp-aes esp-sha-hmac  mode transport  exit  crypto ipsec profile cisco  set transform-set t-set  exit

 ************************************************************   soke

 crypto isakmp policy 1  authentication pre-share  encryption aes  hash sha  group 5  lifetime 1800  exit  crypto isakmp key 0 cisco address 101.1.1.100  crypto isakmp key 0 cisco address 102.1.1.100  crypto isakmp key 0 cisco address 104.1.1.100  crypto ipsec transform-set t-set esp-aes esp-sha-hmac  mode transport  exit  crypto ipsec profile cisco  set transform-set t-set  exit

 ***************************************************************

 spoke

 crypto isakmp policy 1  authentication pre-share  encryption aes  hash sha  group 5  lifetime 1800  exit  crypto isakmp key 0 cisco address 101.1.1.100  crypto isakmp key 0 cisco address 102.1.1.100  crypto isakmp key 0 cisco address 103.1.1.100  crypto ipsec transform-set t-set esp-aes esp-sha-hmac  mode transport  exit  crypto ipsec profile cisco  set transform-set t-set  exit

 ****************************************************************

 Routing hub

 router eigrp 100  no auto-summary  network 192.168.1.0  network 192.168.101.0  exit

 ****************************************************************

 Spoke

 router eigrp 100  no auto-summary  network 192.168.1.0  network 192.168.102.0  exit

 *******************************************************************

 spoke

 router eigrp 100  no auto-summary  network 192.168.1.0  network 192.168.103.0  exit

 ******************************************************************

 Spoke

 router eigrp 100  no auto-summary  network 192.168.1.0  network 192.168.104.0  exit

 ******************************************************************

 interface tunnel configuration

  int t0  ip address 192.168.1.2 255.255.255.0  tunnel source serial 0/0  tunnel mode gre multipoint  tunnel key 1  ip nhrp map 192.168.1.1 101.1.1.100  ip nhrp map multicast 101.1.1.100  ip nhrp authentication cisco  ip nhrp network-id 1  ip nhrp holdtime 300  tunnel protection ipsec profile cisco  ip nhrp nhs 192.168.1.1

 *********************************************************************

 interface tunnel configuration

  int t0  ip address 192.168.1.3 255.255.255.0  tunnel source serial 0/0  tunnel mode gre multipoint  tunnel key 1  ip nhrp map 192.168.1.1 101.1.1.100  ip nhrp map multicast 101.1.1.100  ip nhrp authentication cisco  ip nhrp network-id 1  ip nhrp holdtime 300  tunnel protection ipsec profile cisco  ip nhrp nhs 192.168.1.1

 **************************************************************************

 interface tunnel configuration

  int t0  ip address 192.168.1.4 255.255.255.0  tunnel source serial 0/0  tunnel mode gre multipoint  tunnel key 1  ip nhrp map 192.168.1.1 101.1.1.100  ip nhrp map multicast 101.1.1.100  ip nhrp authentication cisco  ip nhrp network-id 1  ip nhrp holdtime 300  tunnel protection ipsec profile cisco  ip nhrp nhs 192.168.1.1  exit

 **************************************************************************

 R1#show ip eigrp neighbors IP-EIGRP neighbors for process 100 H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq                                            (sec)         (ms)       Cnt Num 2   192.168.1.4             Tu0               14 00:01:09  152  5000  0  3 1   192.168.1.3             Tu0               10 00:01:43   96  5000  0  3 0   192.168.1.2             Tu0               12 00:04:46   41  5000  0  3

*****************************************************************************

R1#show ip route eigrp D    192.168.104.0/24 [90/297270016] via 192.168.1.4, 00:02:05, Tunnel0 D    192.168.102.0/24 [90/297270016] via 192.168.1.2, 00:05:14, Tunnel0 D    192.168.103.0/24 [90/297270016] via 192.168.1.3, 00:02:40, Tunnel0 R1#

*****************************************************************************

R4#show crypto ipsec sa

interface: Tunnel0    Crypto map tag: Tunnel0-head-0, local addr 104.1.1.100

  protected vrf: (none)   local  ident (addr/mask/prot/port): (104.1.1.100/255.255.255.255/47/0)   remote ident (addr/mask/prot/port): (101.1.1.100/255.255.255.255/47/0)   current_peer 101.1.1.100 port 500     PERMIT, flags={origin_is_acl,}    #pkts encaps: 59, #pkts encrypt: 59, #pkts digest: 59    #pkts decaps: 60, #pkts decrypt: 60, #pkts verify: 60    #pkts compressed: 0, #pkts decompressed: 0    #pkts not compressed: 0, #pkts compr. failed: 0    #pkts not decompressed: 0, #pkts decompress failed: 0    #send errors 1, #recv errors 0

    local crypto endpt.: 104.1.1.100, remote crypto endpt.: 101.1.1.100     path mtu 1500, ip mtu 1500, ip mtu idb Serial0/0     current outbound spi: 0xA347CF36(2739392310)

    inbound esp sas:      spi: 0x37DB83F1(937133041)        transform: esp-aes esp-sha-hmac ,        in use settings ={Transport, }        conn id: 2001, flow_id: SW:1, crypto map: Tunnel0-head-0        sa timing: remaining key lifetime (k/sec): (4398054/3374)        IV size: 16 bytes        replay detection support: Y        Status: ACTIVE

    inbound ah sas:

    inbound pcp sas:

    outbound esp sas:      spi: 0xA347CF36(2739392310)        transform: esp-aes esp-sha-hmac ,        in use settings ={Transport, }        conn id: 2002, flow_id: SW:2, crypto map: Tunnel0-head-0        sa timing: remaining key lifetime (k/sec): (4398054/3372)        IV size: 16 bytes        replay detection support: Y        Status: ACTIVE

    outbound ah sas:

    outbound pcp sas: R4#

**********************************************************************************

R4#ping 192.168.102.1 source fastEthernet 0/0 repeat 1000

Type escape sequence to abort. Sending 1000, 100-byte ICMP Echos to 192.168.102.1, timeout is 2 seconds: Packet sent with a source address of 192.168.104.1 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!! Success rate is 100 percent (1000/1000), round-trip min/avg/max = 1/2/56 ms

***********************************************************************************

R4#show ip nhrp 192.168.1.1/32 via 192.168.1.1, Tunnel0 created 00:07:16, never expire  Type: static, Flags: authoritative used  NBMA address: 101.1.1.100 192.168.1.2/32 via 192.168.1.2, Tunnel0 created 00:00:30, expire 00:04:32  Type: dynamic, Flags: router  NBMA address: 102.1.1.100 R4#

************************************************************************************

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