Tuesday, September 27, 2022

How To Create VPN Tunnel Between Two Sites

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Understanding Ike And Ipsec Packet Processing

Part 1 : How to setup a Site-to-Site VPN tunnel between two cisco routers

An IPsec VPN tunnel consists of tunnel setup and applied security. During tunnel setup, the peers establish security associations , which define the parameters for securing traffic between themselves. After the tunnel is established, IPsec protects the traffic sent between the two tunnel endpoints by applying the security parameters defined by the SAs during tunnel setup. Within the Junos OS implementation, IPsec is applied in tunnel mode, which supports the Encapsulating Security Payload and Authentication Header protocols.

This topic includes the following sections:

Now Repeat Same Steps In R2

Step 1. Configuring IPSec Phase 1

Step 2. Configuring IPSec Phase 2

Step 3. Configuring Extended ACL for interesting traffic.

Step 4. Configure Crypto Map.

Step 5. Apply Crypto Map to outgoing interface

Step 6. Exclude VPN traffic from NAT Overload.

Verification and testing.

To test the VPN connection lets ping from R1 to PC2.

As you can see, the ping from R1 to PC2 is successful. Dont forget to ping from inside IP address while testing the VPN tunnel from the router. You can also ping from PC1 to PC2.

To verify the IPSec Phase 1 connection, type show crypto isakmp sa as shown below.

To verify IPSec Phase 2 connection, type show crypto ipsec sa as shown below.

You can also view active IPSec sessions using show crypto session command as shown below.

Ipsec VPN Feature Support On Srx5000 Line Of Devices With Srx5k

This topic provides you a summary of IPsec VPN features and configurations that are not supported of SRX5000 line of devices with SPC3 and on vSRX instances.

IPsec VPN feature is supported by two processes, iked andikemd on SRX5K-SPC3 and vSRX instances. A single instance ofiked and ikemd will run on the Routing Engine at a time.

To restart ikemd process in the Routine Engine use therestart ike-config-management command.

To restart iked process in the Routing Engine use therestart ike-key-management command.

If you want to use KMD process to enable IPsec VPN features on SRX5000 line of devices without a SPC3 card, you must run the request system software delete junos-ike command. After running the command, you must reboot the device.

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Site To Site VPN Through Two Firewalls

Get answers from your peers

We have an outside fw and an inside fw something like this:

internet – outside fw – dmz – inside fw – lan

We need to create a site to site VPN connection to our head office. I want to approach this the right way so should I:

a- Create a site to site VPN on the outside fw and allow passthrough on the inside fw

b – Allow passthrough on the outside fw and create the site to site VPN on the inside fw

c – Create a site to site VPN on the outside fw to head office and create another site to site VPN from the outside fw to the inside fw

Which is the best method and which will be most reliable?


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I would get rid of one of the firewalls since one could manage access to the internet, DMZ, and the VPN.

What is the reason for having an extra firewall.

Site to Site VPN should be directly to the main firewall, no reason to have double NAT or secondary firewall.

SI System Integration d.o.o. is an IT service provider.

Option C doesn’t make much sense, would be just adding unnecessary latency.

Option B is cool, when the internal FW has a public IP on the DMZ side . If not, or your firewall must support NAT traversal – but than you loose on NAT.

I won’t go into the discussion, why there are two firewalls – sometimes it is just simply a requirement.

Thanks for the feedback guys.

Configuration Of VPN Between R1 And R2

Network Simulator Lab:Configuring site

Lets connect to R1 and start the configuration. First of all, I will create the ISKMP Phase 1 policy for remote router R1.

R1#conf tEnter configuration commands, one per line.  End with CNTL/Z.R1#crypto isakmp policy 1R1#encryption 3desR1#hash md5R1#group 2R1#lifetime 86400R1#authentication pre-shareR1#exitR1#crypto isakmp key  address

For details about above configuration commands, you can see the Site to Site IPsec VPN Tunnel section.

Now, I will create an extended access-list to identify the interesting traffic .

R1#ip access-list extended VPN-Traffic-To-R2R1#permit ip

The above access-list will allow only the traffic sourced from subnet and destined towards subnet to be sent over tunnel and this will also prevent the traffic destined towards internet not be encrypted.

Next step is to configure ISAKMP Phase-2.

R1#R1#crypto ipsec transform-set set1 esp-3des esp-md5-hmacR1#exitR1#crypto map CMAP 10 ipsec-isakmp% NOTE: This new crypto map will remain disabled until a peer  and a valid access list have been configured.R1#description ### Tunnel to R2 Router ###R1#set peer transform-set set1R1#match address VPN-Traffic-To-R2R1#endR1#

Remember that set1 is the name of transform set which will be used for ISAKMP policy 1, CMAP is the name of crypto-map and 10 is the sequence number.

For detailed NAT configuration, you can take a look at this section.

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How To Set Up Openvpn Access Server For Site

We are assuming that you already have an OpenVPN Access Server installation working, and that it is installed in your private network behind a router with Internet access and has a private IP address, with port forwarding set up so that it can be reached from the outside, and with appropriate settings made so that it is actually reachable with an OpenVPN client program from the outside. In other words, that you have an OpenVPN Access Server installation that works and lets OpenVPN clients connect. If you haven’t installed Access Server yet then please do so first. See the Access Server installation options page for more information.

This section here describes which settings to configure in the OpenVPN Access Server to make a site-to-site setup possible. We are going to assume we’re setting up the site-to-site setup as shown in the pictures above, with the subnets used there. If your subnets are different, and they very likely are, you should adjust as needed to match your situation. Important note: it is required for site-to-site to work that the subnets are different in the two networks.

  • Network with subnet mask through gateway
  • Network with subnet mask through gateway

Does Your Business Need One

This depends on a number of factors, but usually will come down to the following considerations, namely:

  • Size of the business
  • Number of locations/offices
  • Sensitivity of data being shared

If your business is small, functioning in one office with little data sharing outside of your premises, then its unlikely that a site-to-site VPN will be necessary.

If, however, youre a growing company that has ambitions to grow into a larger organization in multiple locations, or perhaps already operating in multiple locations, then a site-to-site VPN would be a sensible investment for now and for the future.

As far as data is concerned, its worth considering how important safeguarding that data is.

For businesses operating in some industries, like healthcare or finance, data protection is absolutely crucial, and not looking after customer records in the most secure manner can be dangerous.

This goes for many businesses of other verticals, too, many of which handle significant amounts of customer data and can face hefty fines or worse if they dont have the right security measures in place.

In 2020, its simply asking for trouble to be sharing unencrypted sensitive data outside of a secured network, so if this applies, then its worth getting a site-to-site VPN to ensure the safety of your customers detailsand the security of your organization.

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Connection Between Two Private Networks Using Ipsec VPN

This example tells how to create IPSec VPN tunnels to encrypt and protect the communication between two private networks . Usually, IPSec VPN tunnel is to connect the Device A in a branch office and the Device B in the headquarters.

* Note: This topology uses laboratory environment. In this recipe, represents public network.

How To Securely Join Two Networks Together Over The Internet

Part 4- Creating Site 2 Site VPN Tunnel between On-premises and Azure

Let’s say there are two locations. Both locations have their own fast Internet connections. How do you join these two networks together such that every computer can see every other computer?

Do you need a domain controller, or can you do this with workgroups?

The obvious solution seems to be VPN, but can VPN be implemented on the routers only? Can the computers on the network be configuration-free?

can VPN be implemented on the routers only? Can the computers on the network be configuration free?

Yes. Assuming reasonable routers and a reasonable network layout. If your sites are all sharing the same IP range then you’ll have to do full NAT and things get messy.

If you provisioned each site in its own subnet, then this is simple, and your only considerations are:

  • minimising traffic over the VPN
  • security of the VPN
  • integrating systems across the VPN

The standard solution is to use use a VPN between two routers, and you adjust the routing so all LAN-to-LAN traffic crosses the VPN.

Domains/Workgroups are really not related at all. A more relevant bit of information would be what type of routers both sites have, and if they can create L2TP, PPTP, or some other encrypted tunnel, or if they are running a standard OS like Linux where you can install software. There are many routers that already support VPN connections. Even some home-routers can do it if you install custom firmware. You can create a VPN between your servers, though getting the routing right may be a bit tricky.

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Configuring Site To Site Ipsec VPN Tunnel Between Cisco Routers

Written by Administrator. Posted in Cisco Routers – Configuring Cisco Routers

Site-to-Site IPSec VPN Tunnels are used to allow the secure transmission of data, voice and video between two sites . The VPN tunnel is created over the Internet public network and encrypted using a number of advanced encryption algorithms to provide confidentiality of the data transmitted between the two sites.

This article will show how to setup and configure two Cisco routers to create a permanent secure site-to-site VPN tunnel over the Internet, using the IP Security protocol. In this article we assume both Cisco routers have a static public IP address. Readers interested in configuring support for dynamic public IP address endpoint routers can refer to our Configuring Site to Site IPSec VPN with Dynamic IP Endpoint Cisco Routers article.

IPSec VPN tunnels can also be configured using GRE Tunnels with IPsec. GRE tunnels greatly simply the configuration and administration of VPN tunnels and are covered in our Configuring Point-to-Point GRE VPN Tunnels article. Lastly, DMVPNs a new VPN trend that provide major flexibility and almost no administration overhead can also be examined by reading our Understanding Cisco Dynamic Multipoint VPN , Dynamic Multipoint VPN Deployment Models & Architectures and Configuring Cisco Dynamic Multipoint VPN – Hub, Spokes , mGRE Protection and Routing – DMVPN Configuration articles.

Establishing And Verifying The Ipsec VPN Tunnel

At this point, weve completed our configuration and the VPN Tunnel is ready to be brought up. To initiate the VPN Tunnel, we need to force one packet to traverse the VPN and this can be achieved by pinging from one router to another:

ping source fastethernet0/0.!!!!

The first icmp echo received a timeout, but the rest received a reply, as expected. The time required to bring up the VPN Tunnel is sometimes slightly more than 2 seconds, causing the first ping to timeout.

To verify the VPN Tunnel, use the show crypto session command:

show crypto session

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Set Up An Ipsec Tunnel

  • Select
  • On the General tab, enter a Name
  • thatwill be used to set up the IPSec tunnel.To create a new tunnel interface:
  • Select
  • field,specify a numeric suffix, such as .2
  • On the Config tab, select the Security Zone drop-downto define the zone as follows:
  • Use your trust zone as the termination point for thetunnelCreate a separatezone for VPN tunnel termination

  • In the Virtual Router drop-down, selectdefault.
  • If you want to assign an IPv4address to the tunnel interface, select the IPv4 tab, and Add theIP address and network mask, for example
  • ) Enable IPv6 on the tunnel interface.
  • Select the IPv6 tab on Network
  • Select the check box to Enable IPv6 onthe interface.This option allows you to route IPv6 traffic over an IPv4IPSec tunnel and will provide confidentiality between IPv6 networks.The IPv6 traffic is encapsulated by IPv4 and then ESP. To routeIPv6 traffic to the tunnel, you can use a static route to the tunnel,or use OSPFv3, or use a Policy-Based Forwarding rule to directtraffic to the tunnel.
  • Enter the 64-bit extended unique InterfaceID in hexadecimal format, for example, 00:26:08:FF:FE:DE:4E:29.By default, the firewall will use the EUI-64 generated from thephysical interfaces MAC address.
  • To assign an IPv6 tothe tunnel interface, Add the IPv6 addressand prefix length, for example 2001:400:f00::1/64. If Prefix isnot selected, the IPv6 address assigned to the interface will bewholly specified in the address text box.
  • Select
  • Configure Site To Site VPN With Ipsec In Cisco

    how to configure site to site ipsec vpn using cisco packet ...

    IPSec VPN is a security feature that allow you to create secure communication link between two different networks located at different sites. Cisco IOS routers can be used to setup VPN tunnel between two sites. Traffic like data, voice, video, etc. can be securely transmitted through the VPN tunnel. In this post, I will show steps to Configure Site to Site IPSec VPN Tunnel in Cisco IOS Router. You can also setup Configure IPSec VPN With Dynamic IP in Cisco IOS Router.Configure Site to Site IPSec VPN Tunnel in Cisco IOS Router

    Diagram below shows our simple scenario. The two sites have static public IP address as shown in the diagram. R1 is configured with and R2 is configured with IP address. As of now, both routers have very basic setup like, IP addresses, NAT Overload, default route, hostnames, SSH logins, etc.

    There are two phases in IPSec configuration called Phase 1 and Phase 2. Lets start the configuration with R1. Before you start configuring the IPSec VPN, make sure both routers can reach each other. I have already verified that both routers can ping each other so lets start the VPN configuration.

    Step 1. Configuring IPSec Phase 1

    Here is the details of each commands used above,

    Step 2. Configuring IPSec Phase 2

    Here is the detail of command used above,

    Step 3. Configuring Extended ACL for interesting traffic.

    Step 4. Configure Crypto Map.

    Here is the detail of command used above,

    Step 6. Exclude VPN traffic from NAT Overload.

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    Creating Ipsec Phase 2 On Pfsense #2 Remote Location

    Once again, click on +Show Phase 2 Entries and click on + Add P2.

    Now enter values like in the following example:

  • On Local network choose Network
  • Enter the Subnet of your Local Network
  • On Remote Network choose Network
  • Enter the Subnet of your Remote Network
  • Enter a description if you want.

    Scroll down to Phase 2 Proposal and enter the values like below.

  • Change AES Encryption to 256 bits
  • Change PFS key group to 15
  • Enter the pfSense #1 HQs IP Address to be pinged automatically
  • Hit Save& Apply Changes.
  • Now, in theory, a tunnel should be established between the two.

    Configuring The Wan: In Firewall To Allow Ipsec Traffic

    The tunnel isnt up! What we have to do now is configure the WAN_LOCAL firewall on both routers to allow IPSec traffic in to the router. Make sure that the firewall rule numbers you configure are higher priority than the default Drop invalid state rule.

    configureset firewall name WAN_LOCAL rule 15 set firewall name WAN_LOCAL rule 15 action acceptset firewall name WAN_LOCAL rule 15 description AllowIPSecset firewall name WAN_LOCAL rule 15 log disableset firewall name WAN_LOCAL rule 15 protocol udpset firewall name WAN_LOCAL rule 15 destination port 500,4500set firewall name WAN_LOCAL rule 16 set firewall name WAN_LOCAL rule 16 action acceptset firewall name WAN_LOCAL rule 16 description AllowESPset firewall name WAN_LOCAL rule 16 log disableset firewall name WAN_LOCAL rule 16 protocol espcommitexit

    Now that Ive applied the above rules to both routers, lets try that show vpn ipsec status command again.

    show vpn ipsec statusIPSec Process Running PID: 111401 Active IPsec TunnelsIPsec Interfaces :

    The tunnel is now up! Lets try to ping the local IP of R1 from R2.

    ping  56 bytes of data.^C--- ping statistics ---6 packets transmitted, 0 received, 100% packet loss, time 5008ms

    No responses were received, so I interrupted the pings with control-c. The requests timed out. Lets see if the traffic is actually traversing the tunnel. Well check this by running show vpn ipsec sa on R2.

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    Network Address Translation And Ipsec VPN Tunnels

    Network Address Translation is most likely to be configured to provide Internet access to internal hosts. When configuring a Site-to-Site VPN tunnel, it is imperative to instruct the router not to perform NAT on packets destined to the remote VPN network.

    This is easily done by inserting a deny statement at the beginning of the NAT access lists as shown below:

    For Site 1s router:

    ip nat inside source list 100 interface fastethernet0/1 overloadaccess-list 100 remark -==-access-list 100 deny ip 100 permit ip anyaccess-list 100 remark

    And Site 2s router:

    ip nat inside source list 100 interface fastethernet0/1 overloadaccess-list 100 remark -==-access-list 100 deny ip 100 permit ip anyaccess-list 100 remark

    Remote Access VPN Might Be Right For Your Business

    Part 2 : How to setup a Site-to-Site VPN tunnel between two cisco routers

    If your primary concern right now is protecting data handled by remote workers, then you might want to invest in a VPN that is remote access-based.

    As we briefly mentioned, a remote access VPN works in much the same way as a site-to-site VPN, onlyas the name impliesit can be logged into from anywhere and any device that has an internet connection.

    Difference between site-to-site and remote access VPN: With a site-to-site VPN, an encrypted tunnel using IPsec is created to establish a VPN between two servers in order to traffic data. With remote access VPN, an SSL VPN is typically used to form connections between the office network and individual endpoints.

    Secure access service edge is a platform that is geared towards companies that house a lot of their data in the cloud, and combines remote access VPNs with the security features that you would expert from a corporate firewall, like threat hunting and detection, next-gen antivirus, and more.

    If youre concerned about company data being handled remotely, then investing in a SASE system is likely the best option for dealing with a remote workforce for now and the futureitll allow you to have all the benefits of your office network security but through the cloud instead.

    While site-to-site VPNs are best suited to businesses which operate with multiple offices, remote access VPN is best suited to organizations which have remote workers, and a combination of the two is ideal for a company that has both.

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