GRA11 Client Configuration

Oct 13, 2025 by leolavanderia.com.br 85 views

Introduction

In this article, we will explore the configuration of StrongSwan for site-to-site VPN connections. StrongSwan is a popular open-source IPsec VPN solution that provides secure and reliable connectivity between multiple sites. However, configuring StrongSwan can be a complex task, especially when dealing with site-to-site connections. In this article, we will focus on troubleshooting a common issue where the client cannot ping the opposite StrongSwan server.

Understanding the Problem

The problem we are trying to solve is a common issue in StrongSwan site-to-site configurations. The client, in this case, GRA11, is unable to ping the opposite StrongSwan server. This issue can be caused by various factors, including misconfigured IPsec policies, incorrect firewall rules, or issues with the StrongSwan configuration.

GRA11 Client Configuration

The GRA11 client is running Ubuntu 22.04, and its public IP address is 54.37... The client's configuration is as follows:

conn ikev2-vpn
  auto=add
  ike=aes256-sha256-modp2048!
  esp=aes256-sha256!
  dpdaction=clear
  left=%any
  leftsubnet=0.0.0.0/0
  leftauth=secret
  leftid=54.37...
  right=192.168.1.100
  rightsubnet=192.168.1.0/24
  rightauth=secret
  rightid=192.168.1.100
  keyexchange=ike
  ikev2-strictcrlchecking=no
  ikev2-rekey=no
  dpddelay=300s
  dpdtimeout=120s
  dpdmaxfail=5
  rekey=no
  rekey=no
  rekey=no

StrongSwan Server Configuration

The StrongSwan server is also running Ubuntu 22.04, and its public IP address is 54.37... The server's configuration is as follows:

conn ikev2-vpn
  auto=add
  ike=aes256-sha256-modp2048!
  esp=aes256-sha256!
  dpdaction=clear
  left=%any
  leftsubnet=0.0.0.0/0
  leftauth=secret
  leftid=54.37...
  right=192.168.1.100
  rightsubnet=192.168.1.0/24
  rightauth=secret
  rightid=192.168.1.100
  keyexchange=ike
  ikev2-strictcrlchecking=no
  ikev2-rekey=no
  dpddelay=300s
  dpdtimeout=120s
  dpdmaxfail=5
  rekey=no
  rekey=no
  rekey=no

Troubleshooting the Issue

To troubleshoot the issue, we need to check the following:

IPsec policies: Ensure that the IPsec policies are correctly configured on both the client and the server. The policies should match the IP addresses and subnets specified in the configuration.
Firewall rules: Disable the firewall on both the client and the server to ensure that there are no firewall rules blocking the IPsec traffic.
StrongSwan configuration: Verify that the StrongSwan configuration is correct and matches the client's configuration.
IKEv2 authentication: Ensure that the IKEv2 authentication is working correctly by checking the authentication logs.

Resolving the Issue

To resolve the issue, we need to:

Check the IPsec policies: Verify that the IPsec policies are correctly configured on both the client and the server.
Disable the firewall: Disable the firewall on both the client and the server to ensure that there are no firewall rules blocking the IPsec traffic.
Verify the StrongSwan configuration: Verify that the StrongSwan configuration is correct and matches the client's configuration.
Check the IKEv2 authentication: Ensure that the IKEv2 authentication is working correctly by checking the authentication logs.

Conclusion

In this article, we explored the configuration of StrongSwan for site-to-site VPN connections. We also discussed the common issue where the client cannot ping the opposite StrongSwan server. By following the troubleshooting steps and resolving the issue, we can ensure that the site-to-site VPN connection is working correctly.

Additional Resources

For more information on StrongSwan and site-to-site VPN connections, please refer to the following resources:

StrongSwan documentation: https://strongswan.org/
Ubuntu documentation: https://ubuntu.com/
IPsec documentation: https://en.wikipedia.org/wiki/IPsec

Example Use Cases

Site-to-site VPN connection between two offices
Remote access VPN connection for employees
Secure communication between multiple sites

Code Snippets

The following code snippets are used in this article:

conn ikev2-vpn
  auto=add
  ike=aes256-sha256-modp2048!
  esp=aes256-sha256!
  dpdaction=clear
  left=%any
  leftsubnet=0.0.0.0/0
  leftauth=secret
  leftid=54.37...
  right=192.168.1.100
  rightsubnet=192.168.1.0/24
  rightauth=secret
  rightid=192.168.1.100
  keyexchange=ike
  ikev2-strictcrlchecking=no
  ikev2-rekey=no
  dpddelay=300s
  dpdtimeout=120s
  dpdmaxfail=5
  rekey=no
  rekey=no
  rekey=no

conn ikev2-vpn
  auto=add
  ike=aes256-sha256-modp2048!
  esp=aes256-sha256!
  dpdaction=clear
  left=%any
  leftsubnet=0.0.0.0/0
  leftauth=secret
  leftid=54.37...
  right=192.168.1.100
  rightsubnet=192.168.1.0/24
  rightauth=secret
  rightid=192.168.1.100
  keyexchange=ike
  ikev2-strictcrlchecking=no
  ikev2-rekey=no
  dpddelay=300s
  dpdtimeout=120s
  dpdmaxfail=5
  rekey=no
  rekey=no
  rekey=no
```<br/>
**StrongSwan Site to Site Configuration: Client Cannot Ping Opposite StrongSwan Server - Q&A**
=====================================================================================
Introduction
In our previous article, we explored the configuration of StrongSwan for site-to-site VPN connections and discussed the common issue where the client cannot ping the opposite StrongSwan server. In this article, we will provide a Q&A section to help you better understand the configuration and troubleshooting process.
Q: What is the difference between a site-to-site VPN and a remote access VPN?
A: A site-to-site VPN is used to connect multiple sites or offices together, while a remote access VPN is used to connect individual users or devices to a network.
Q: What is the purpose of the conn ikev2-vpn configuration?
A: The conn ikev2-vpn configuration is used to define the IPsec policy for the site-to-site VPN connection. It specifies the encryption algorithms, authentication methods, and other settings for the connection.
Q: Why is the leftsubnet parameter set to 0.0.0.0/0?
A: The leftsubnet parameter is set to 0.0.0.0/0 to specify that the client's subnet is the entire IPv4 address space. This allows the client to access any IP address on the network.
Q: What is the purpose of the rightsubnet parameter?
A: The rightsubnet parameter is used to specify the subnet of the server. In this case, it is set to 192.168.1.0/24, which means that the server's subnet is the 192.168.1.0 network with a subnet mask of 24.
Q: Why is the ikev2-strictcrlchecking parameter set to no?
A: The ikev2-strictcrlchecking parameter is set to no to disable strict CRL checking. This allows the client to connect to the server even if the CRL is not available.
Q: What is the purpose of the dpddelay parameter?
A: The dpddelay parameter is used to specify the delay between DPD (Dead Peer Detection) messages. In this case, it is set to 300s, which means that DPD messages will be sent every 5 minutes.
Q: Why is the dpdtimeout parameter set to 120s?
A: The dpdtimeout parameter is set to 120s to specify the timeout for DPD messages. If a DPD message is not received within this time, the connection will be terminated.
Q: What is the purpose of the dpdmaxfail parameter?
A: The dpdmaxfail parameter is used to specify the maximum number of failed DPD messages allowed before the connection is terminated. In this case, it is set to 5, which means that the connection will be terminated after 5 failed DPD messages.
Q: How do I troubleshoot the issue if the client cannot ping the opposite StrongSwan server?
A: To troubleshoot the issue, you can check the following:

IPsec policies: Ensure that the IPsec policies are correctly configured on both the client and the server.
Firewall rules: Disable the firewall on both the client and the server to ensure that there are no firewall rules blocking the IPsec traffic.
StrongSwan configuration: Verify that the StrongSwan configuration is correct and matches the client's configuration.
IKEv2 authentication: Ensure that the IKEv2 authentication is working correctly by checking the authentication logs.

Conclusion
In this article, we provided a Q&A section to help you better understand the configuration and troubleshooting process for StrongSwan site-to-site VPN connections. We hope that this article has been helpful in resolving any issues you may have encountered.
Additional Resources
For more information on StrongSwan and site-to-site VPN connections, please refer to the following resources:

StrongSwan documentation: <https://strongswan.org/&gt;
Ubuntu documentation: <https://ubuntu.com/&gt;
IPsec documentation: <https://en.wikipedia.org/wiki/IPsec&gt;

Example Use Cases

Site-to-site VPN connection between two offices
Remote access VPN connection for employees
Secure communication between multiple sites

Code Snippets
The following code snippets are used in this article:
conn ikev2-vpn
  auto=add
  ike=aes256-sha256-modp2048!
  esp=aes256-sha256!
  dpdaction=clear
  left=%any
  leftsubnet=0.0.0.0/0
  leftauth=secret
  leftid=54.37...
  right=192.168.1.100
  rightsubnet=192.168.1.0/24
  rightauth=secret
  rightid=192.168.1.100
  keyexchange=ike
  ikev2-strictcrlchecking=no
  ikev2-rekey=no
  dpddelay=300s
  dpdtimeout=120s
  dpdmaxfail=5
  rekey=no
  rekey=no
  rekey=no
</code></pre>
<pre><code class="hljs">conn ikev2-vpn
  auto=add
  ike=aes256-sha256-modp2048!
  esp=aes256-sha256!
  dpdaction=clear
  left=%any
  leftsubnet=0.0.0.0/0
  leftauth=secret
  leftid=54.37...
  right=192.168.1.100
  rightsubnet=192.168.1.0/24
  rightauth=secret
  rightid=192.168.1.100
  keyexchange=ike
  ikev2-strictcrlchecking=no
  ikev2-rekey=no
  dpddelay=300s
  dpdtimeout=120s
  dpdmaxfail=5
  rekey=no
  rekey=no
  rekey=no
</code></pre>


                
                    
                        

                    
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