IPsec

{{#allow-groups:user}}

We make a cisco 2811 router into an ipsec host.

General info

WAN interface: fa0/0

LAN interface: fa0/1

Configuring

First we setup our network connections

interface FastEthernet0/0
 description *allworkandnoplaymakestranslatoradullboy*
 ip address 10.10.10.2 255.255.255.0
 ip nat outside
 ipv6 ospf cost 1
 crypto map ipsecmap

interface FastEthernet0/1
 description *areallydullboy*
 ip address 192.168.100.1 255.255.255.0
 ip nat inside

We enable aaa new-model simply by running the command

 aaa new-model

We aren't talking about an AA-club, AAA stand for authentication-authorization-accounting. It is often used when fiddling with authentication and the likes.

Now we define logins to be locally sourced and not for instance from a radius server.

 aaa authentication login IPsecE local
 aaa authorization network IPsecO local

We tell the router to ALWAYS use esp-3des esp-md5-hmac encryption.

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

We create a dynamic field which makes ipsec use example encryption.

 crypto dynamic-map TestMap 7
 set transform-set Example 

We make a isakmp policy which defines the connection's tweaks:

 crypto isakmp policy 7
 encr 3des
 authentication pre-share
 group 2

Sitten luodaan ryhmä ipseciä varten

crypto isakmp client configuration group Testaajat
 key Avain
 pool testipool
 netmask 255.255.255.0

Tehdään osoiteavaruus nimellä testipool, josta tulee osoitteet asiakkaille.

ip local pool testipool 192.168.70.20 192.168.70.30

Tehdään taas kartta ja tutkitaan mitä olemme tehneet.

crypto map ipsecmap client authentication list IpsecE
crypto map ipsecmap isakmp authorization list IpsecO
crypto map ipsecmap client configuration address respond
crypto map ipsecmap 7 ipsec-isakmp dynamic TestiMap

NAT tarvitsee vielä pistää pystyyn.

ip access-list extended nonat
 deny ip 192.168.100.0 0.0.0.255 192.168.70.0 0.0.0.255
 permit ip any any

ip nat inside source list nonat interface FastEthernet0/0 overload

Tehdään vielä käyttäjä.

username johannes password 0 Qwerty1

Testataan nyt VPN:äämme

Laitetaan tiedot kohdalleen

Ja sisälle päästiin.