- Luis O P Carvalho
- IT Analyst; Lic. Computer Science, Bel. in Theology, Esp. Biblical Theology, Esp. in New Testament Theology, Esp. in Systematic Theology and Esp. Computer Network.
Como configurar o Túnel VPN IPSec Site-to-Site PFSense para acesso remoto
Internet Protocol security (IPsec) uses cryptographic security mechanism to protect communications over Internet Protocol (IP) networks. IPSec protocol allows you to authenticate and encrypt all IP traffic between your local office/datacenter/SOHO and remote location. You can pass all traffic over the Internet or through networks which would otherwise be considered insecure.
In this faq, you will set up the VPN using PFSense in tunnel mode (network-to-network VPNs) and use the ESP protocol in order to encrypt the VPN traffic as it traverses the Internet.
Our sample setup
Above is a very simple site-to-site VPN, with a security gateway (SOHO and Remote IDC) linking two remote private networks 192.168.1.0/24 and 10.10.29.64/26. Remote IDC VPN is powered by either a Cisco/OpenBSD based system and local SOHO vpn (PFSense) gateways are already configured. From the above, you can see the IPSec config on is as follows:
VPN config provided by a CISCO/OpenBSD gateway located in remote IDC
Phase 1:
| Phase 1 config | Savings |
|---|---|
| Your peer IPv4 address | 122.16.7.42 |
| Cisco/OpenBSD gateway IPv4 address | 173.191.1.42 |
| Preshared Key | YOUR-super-secret-password-key |
| Encryption | 3DES |
| Authentication | MD5 |
| Diffie-Hellman Group | 2 |
| Keylife | 14400 |
Phase 2:
| Phase 2 config | Values |
|---|---|
| Encryption | 3DES |
| Authentication | MD5 |
| Perfect Forward Secrecy (PFS) | Yes |
| Diffie-Hellman Group | 2 |
| Keylife | 3600 |
| SOHO Subnets | 192.168.1.0/24 |
| Remote Subnets | 10.10.29.64/26 and 10.12.249.192/26 |
PFSense appliance VPN IPSec configuration
pfSense must be setup and working properly for the existing local network environment. Both locations must be using non-overlapping LAN IP subnets. For demo purpose my PFSense appliance located at https://192.168.1.254/.
Step #1: Login to admin webui
Fire a browser and type the following url:
Sample outputs:
https://192.168.1.254/Sample outputs:
Step #2: Setup the VPN Tunnel
Click on VPN > IPSec:
You will see screen as follows. Make sure you check Enable IPsec and click Save to enable IPsec:
Step #3: Configure a new tunnel
Click on + button (see fig.04) to add a new IPsec tunnel Phase 1 configuration. Make sure Interface set to “WAN”, Remote Gateway to “173.191.1.42”, Authentication Method to Pre-Shared key to “YOUR-super-secret-password-key”, Encryption to “3DES”, Authentication to “MD5”, Diffie-Hellman Group to “2”, Keylife to “14400”, and finally press the Save button.
You will see the message as follows on screen:
Click on the Apply changes button:
Step #4: Create a new Phase 2 config
To create a new Phase 2, click the large + inside the Phase 1 entry in the list, on the left-hand side. This expands the list to display all Phase 2 entries for this Phase 1. Click the + button on the right to add a new entry:
The Phase 2 information must be set as described in Phase 2 config table (see above):
You must set remote network as “10.10.29.64/26”, Protcol to “ESP”, Encrption algorithmes to “3DES”, Hash algothrithms to “MD5”, PFS key group to “2”, lifetime to “3600” and finally click on the Save button and Apply changes button to activate the tunnel.
Step #5: Add IPSec firewall rules
By default firewall rules are automatically added to the WAN to allow the tunnel to connect, but if the option to disable automatic VPN rules is checked, then manual rules may be required. The following rules added by the firewall (you can see them by typing the pfctl -sr | grep -i ipsec command at PFSense console)
To setup IPSec firewall rules as per your needs, click on the Firewall > Rules and IPsec tab. Setup rules as per your needs.
How do I see the current status of the IPSec vpn?
Click on the Status > IPSec:
You will see the screen as follows:
Give it a few seconds to connect to the remote side. Once connected you will see the status as follows:
How do I test my vpn setup?
Try to ping or ssh into one of the remote server:
$ ping -c2 10.10.29.68 PING 10.10.29.68 (10.10.29.68): 56 data bytes 64 bytes from 10.10.29.68: icmp_seq=0 ttl=60 time=267.420 ms 64 bytes from 10.10.29.68: icmp_seq=1 ttl=60 time=271.900 ms --- 10.10.29.68 ping statistics --- 2 packets transmitted, 2 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 267.420/269.660/271.900/2.240 ms $ ssh root@10.10.29.68
And, there you have it, VPN up and running from your SOHO.
fonte: https://www.cyberciti.biz
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