Re: VPN(Site-to-site)

dibyam-baral · ‎12-19-2013

Someone please help me to built site to site vpn between 3 routers.I have tried alot but i failed.Its over me, you guys please help....

This is my topology.

Karsten Iwen · ‎12-19-2013

You probably struggeld with the crypto-maps?

Best to use VTIs where you build tunnel-interfaces between each pair of routers:

http://www.cisco.com/en/US/docs/ios-xml/ios/sec_conn_vpnips/configuration/15-mt/sec-ipsec-virt-tunnl.html

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dibyam-baral · ‎12-19-2013

This configuration is from router1

hostname R1

!

crypto isakmp policy 10

encr 3des

hash md5

authentication pre-share

group 2

!

crypto isakmp key dibyam address 10.10.10.2

crypto isakmp key dibyam address 10.10.10.3

!

crypto ipsec transform-set vpnset esp-3des esp-md5-hmac

!

crypto map vpnmap 10 ipsec-isakmp

set peer 10.10.10.2

set peer 10.10.10.3

set transform-set vpnset

match address 100

!

spanning-tree mode pvst

!

interface Loopback0

ip address 1.1.1.1 255.255.255.255

!

interface FastEthernet0/0

description connected to/form s1

ip address 10.10.10.1 255.255.255.0

duplex auto

speed auto

crypto map vpnmap

!

interface FastEthernet0/1

description connected to/from lan

ip address 192.168.1.100 255.255.255.0

duplex auto

speed auto

!

interface Vlan1

no ip address

shutdown

!

router rip

version 2

network 1.0.0.0

network 10.0.0.0

network 192.168.1.0

no auto-summary

!

ip classless

!

access-list 100 permit ip 192.168.1.0 0.0.0.255 192.168.2.0 0.0.0.255

access-list 100 permit ip 192.168.1.0 0.0.0.255 192.168.3.0 0.0.0.255

This configuration is from router2

hostname R2

!

crypto isakmp policy 10

encr 3des

hash md5

authentication pre-share

group 2

!

crypto isakmp key dibyam address 10.10.10.1

crypto isakmp key dibyam address 10.10.10.3

!

crypto ipsec transform-set vpnset esp-3des esp-md5-hmac

!

crypto map vpnmap 10 ipsec-isakmp

set peer 10.10.10.1

set peer 10.10.10.3

set transform-set vpnset

match address 100

!

spanning-tree mode pvst

!

interface Loopback0

ip address 2.2.2.2 255.255.255.255

!

interface FastEthernet0/0

description connected to/from s1

ip address 10.10.10.2 255.255.255.0

duplex auto

speed auto

crypto map vpnmap

!

interface FastEthernet0/1

description connected to/from lan

ip address 192.168.2.100 255.255.255.0

duplex auto

speed auto

!

interface Vlan1

no ip address

shutdown

!

router rip

version 2

network 2.0.0.0

network 10.0.0.0

network 192.168.2.0

no auto-summary

!

ip classless

!

access-list 100 permit ip 192.168.2.0 0.0.0.255 192.168.1.0 0.0.0.255

access-list 100 permit ip 192.168.2.0 0.0.0.255 192.168.3.0 0.0.0.255

This configuration is from router3

hostname R3

!

crypto isakmp policy 10

encr 3des

hash md5

authentication pre-share

group 2

!

crypto isakmp key dibyam address 10.10.10.1

crypto isakmp key dibyam address 10.10.10.2

!

crypto ipsec transform-set vpnset esp-3des esp-md5-hmac

!

crypto map vpnmap 10 ipsec-isakmp

set peer 10.10.10.1

set peer 10.10.10.2

set transform-set vpnset

match address 100

!

spanning-tree mode pvst

!

interface Loopback0

ip address 3.3.3.3 255.255.255.255

!

interface FastEthernet0/0

description connected to/from s1

ip address 10.10.10.3 255.255.255.0

duplex auto

speed auto

crypto map vpnmap

!

interface FastEthernet0/1

description connected to/from lan

ip address 192.168.3.100 255.255.255.0

duplex auto

speed auto

!

interface Vlan1

no ip address

shutdown

!

router rip

version 2

network 3.0.0.0

network 10.0.0.0

network 192.168.3.0

no auto-summary

!

ip classless

!

access-list 100 permit ip 192.168.3.0 0.0.0.255 192.168.1.0 0.0.0.255

access-list 100 permit ip 192.168.3.0 0.0.0.255 192.168.2.0 0.0.0.255

This configuration is from switch

VLAN Name Status Ports

---- -------------------------------- --------- -------------------------------

1 default active Fa0/4, Fa0/5, Fa0/6, Fa0/7

Fa0/8, Fa0/9, Fa0/10, Fa0/11

Fa0/12, Fa0/13, Fa0/14, Fa0/15

Fa0/16, Fa0/17, Fa0/18, Fa0/19

Fa0/20, Fa0/21, Fa0/22, Fa0/23

Fa0/24

100 VPN active Fa0/1, Fa0/2, Fa0/3

1002 fddi-default active

1003 token-ring-default active

1004 fddinet-default active

1005 trnet-default active

Karsten Iwen · ‎12-19-2013

Your crypto-maps are wrong. You need two sequences, one for each peer. Each sequence has hits own ACL and peer-setting. If it's for learning, continue with crypto-maps. If it's for production, go for virtual tunnel interfaces.

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Don't stop after you've improved your network! Improve the world by lending money to the working poor:
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dibyam-baral · ‎12-19-2013

like what,this!!!

crypto map vpnmap 10 ipsec-isakmp

set peer 10.10.10.2

set transform-set vpnset

match address 100

!

crypto map vpnmap 11 ipsec-isakmp

set peer 10.10.10.3

set transform-set vpnset

match address 100

access-list 100 permit ip 192.168.1.0 0.0.0.255 192.168.2.0 0.0.0.255

access-list 100 permit ip 192.168.1.0 0.0.0.255 192.168.3.0 0.0.0.255

Trust me, i have done but still no result.

Let me explain one thing,,,R1 can ping to R2 and R3 but R2 cant ping R3 and similarly R2 and R3 can ping R1.

There is no icmp connection between R2 and R3.

Karsten Iwen · ‎12-19-2013

Let me explain one thing,,,R1 can ping to R2 and R3 but R2 cant ping R3 and similarly R2 and R3 can ping R1.

so you don't even have reachability between yopur routers? How should the VPNs work then. Troubleshoot that first.

For the crypto-maps: You also need dedicated ACLs per peer:

crypto map vpnmap 12 ipsec-isakmp

set peer 10.10.10.2

set transform-set vpnset

match address 102

!

crypto map vpnmap 13 ipsec-isakmp

set peer 10.10.10.3

set transform-set vpnset

match address 103

access-list 102 permit ip 192.168.1.0 0.0.0.255 192.168.2.0 0.0.0.255

access-list 103 permit ip 192.168.1.0 0.0.0.255 192.168.3.0 0.0.0.255

--
Don't stop after you've improved your network! Improve the world by lending money to the working poor:
http://www.kiva.org/invitedby/karsteni