KB ID 0000070
Note: IPSEC VPN is still possible, but getting Windows clients is a little sketchy, and you will have to mess about with them to get them to work on modern versions of Windows. (Mac OSX and iPhone/iPad can connect with their built in VPN software though).
It also uses the Cisco VPN client – This is no longer available form Cisco see the following article.
Step1 Configure the ASA5500
2. Select “Remote Access”. > Next.
3. Select Cisco VPN Client. > Next.
4. Enter a Pre Shared Key e.g. thisisthepresharedkey > And then give the Tunnel group a name e.g. “RemoteVPN”. > Next.
5. Select “Authenticate using the local user database”. > Next.
6. Now create a user, for this exercise I’ve created a user called user1 with a password of password1
7. Click Add. > Next.
8. Now we need to create some IP addresses that the remote clients will use when connected. > Click New
9. Give the Pool a name e.g. RemotePool and set the start and end IP addresses you want to lease (note these DONT have to be on the same network as your internal IP’s – In fact, for auditing its good practice to make them different). > Enter a Subnet Mask. > OK.
10 Click Next.
14. You can choose what IP addresses you want the remote VPN clients to have access to, first change the dropdown to “Inside”, here I want them to have access to the entire network behind the ASA so I will choose 10.254.254.0 with a mask of 255.255.255.0 > Click Add. > Next.
NOTE If you do not tick the box to enable “Split Tunneling” then the client cannot browse the internet etc while connected via VPN.
15. Review the information at the end of the wizard. > Finish
16. Now you need to save the changes you have just made, From the ASDM Select File > “Save running configuration to flash”
Step 2 Configure the Client VPN Software on the remote client.
Also See THIS VIDEO
1. I’ll assume you have the software installed you can get it from two places, On the CD that came with the ASA, or download it direct from Cisco (NOTE this needs a valid Cisco CCO account and a service contract). > Click New.
2. Under connection entry give the connection a name e.g. “Remote VPN to Office” > Under “Host” enter the Public IP of the ASA (NOTE I’ve blurred this one out to protect my IP address). > Under “Name” enter the name you created earlier (Step 1 number 4) > Under Password use the password you created earlier (Step 1 number 4) and enter it a second time to confirm. NOTE these are NOT the usernames and passwords you created in Step 1 number 6. > Click Transport Tab.
3 Accept the defaults but tick “Allow LAN access if you want to be able to access YOUR drives etc from the network behind the ASA” > Save.
4. Select the Connection you have just created. > Connect.
5. Enter the username and password you created earlier (Step 1 Number 6) of user1 and password1. > OK.
6 After a few seconds (provided the details were all right) it will connect, hover over the padlock in your task tray and it should say “VPN Client – Connected”.
Create Additional Users on the ASA
1. Open the ASDM and navigate to Configuration > VPN > General > Users > Add.
2. Give the user a name > Enter and confirm a password > Set the Privilege Level to 0 > Then Select the VPN Policy Tab
3. > Under Group Policy untick “Inherit” > Select RemoteVPN (the policy you set in Step1 Number 4) > OK.
4. You will now see the user listed (Don’t forget to save the settings, (File > “Save Running Configuration to Flash”).
Setup ASA 5500 IPSEC Remote VPN From Command Line
ip local pool IPSEC-VPN-POOL 10.254.250.1-10.254.250.100 mask 255.255.255.0 ! access-list ACL-SPLIT-TUNNEL standard permit 10.254.254 255.255.255.0 ! object network Obj-Remote-IPSEC-VPN subnet 10.254.250.0 255.255.255.128 ! object network Obj-Local-LAN subnet 10.254.254.0 255.255.255.0 ! group-policy IPSEC-Remote-VPN internal group-policy IPSEC-Remote-VPN attributes von-tunnel-protocol ikev1 split-tunnel-policy tunnelspecified split-tunnel-network-list value ACL-SPLIT-TUNNEL dns-server value 188.8.131.52 default-domain value petenetlive.com vpn-simultaneous-logins 5 ! tunnel-group IPSEC-Remote-VPN type remote-access tunnel-group IPSEC-Remote-VPN general-attributes default-group-policy IPSEC-Remote-VPN address-pool IPSEC-VPN-POOL tunnel-group IPSEC-Remote-VPN ipsec-attributes ikev1 pre-shared-key 123456 ! crypto ikev1 policy 10 authentication pre-share encryption 3des hash sha group 2 lifetime 86400 ! crypto ikev1 enable outside ! crypto ipsec ikev1 transform-set ESP-3DES-SHA esp-3des esp-sha-hmac ! crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set pfs group2 crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set ikev1 transform-set ESP-3DES-SHA crypto map outside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP crypto map outside_map interface outside ! nat (inside,outside) 1 source static Obj-Local-LAN Obj-Local-LAN destination static Obj-Remote-IPSEC-VPN Obj-Remote-IPSEC-VPN no-proxy-arp route-lookup ! crypto isakmp nat-traversal 20 ! username TestUser password Password123 privilege 0 username TestUser attributes vpn-group-policy IPSEC-Remote-VPN
Below, is the commands required for an ASA running code OLDER than version 8.3
access-list splitvpn standard permit 10.254.254.0 255.255.255.0 access-list nonat extended permit ip 10.254.254.0 255.255.255.0 10.254.250.0 255.255.255.0 ip local pool VPNPool 10.254.250.1-10.254.250.254 mask 255.255.255.0 nat (inside) 0 access-list nonat group-policy remotevpn internal group-policy remotevpn attributes dns-server value 10.254.254.10 ipsec-udp enable split-tunnel-policy tunnelspecified split-tunnel-network-list value splitvpn split-dns value petenetlive.com username user1 password IzFIX6IZbh5HBYwq encrypted privilege 0 username user1 attributes vpn-group-policy remotevpn sysopt connection tcpmss 1200 crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac crypto dynamic-map dynmap 20 set transform-set ESP-3DES-SHA crypto map outside_map 64553 ipsec-isakmp dynamic dynmap crypto map outside_map interface outside crypto isakmp identity hostname crypto isakmp enable outside crypto isakmp policy 10 authentication pre-share encryption 3des hash sha group 2 lifetime 86400 crypto isakmp nat-traversal 20 tunnel-group remotevpn type ipsec-ra tunnel-group remotevpn general-attributes address-pool vpnpool default-group-policy remotevpn tunnel-group remotevpn ipsec-attributes pre-shared-key thisisthepresharedkey
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Original article written 21/01/10 updated 07/06/11