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Can you connect by IP Address? <br />
<br />
Can you / did you enable NAT Traversal in your VPN Tunnel? <br />
<br />
Is the setup Site to Site? &nbsp;Or Client to Gateway?
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Can you connect by IP Address?

Can you / did you enable NAT Traversal in your VPN Tunnel?

Is the setup Site to Site?  Or Client to Gateway?

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the first time we setup ER-6120, it was connecting, but the next day it was not pinging the local host. It is a client VPN, not a site-to-site. <br />
<br />
I asked client to update firmware on all of those routers, and the firmware is now up to date.<br />
<br />
The last info is that the client VPN connects, but can't ping local host. we enabled IPSEC pass-through on both routers.<br />
<br />
do not know where to &nbsp;enable &quot;NAT Traversal&quot; on the router though...
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the first time we setup ER-6120, it was connecting, but the next day it was not pinging the local host. It is a client VPN, not a site-to-site.

I asked client to update firmware on all of those routers, and the firmware is now up to date.

The last info is that the client VPN connects, but can't ping local host. we enabled IPSEC pass-through on both routers.

do not know where to  enable "NAT Traversal" on the router though...

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NAT Traversal only relates to Site to Site and you say this is client to Gateway. NAT Traversal should be handled by the client. <br />
<br />
What client software do you use? &nbsp;I use NCP Secure Entry (<a href="http://www.ncp-e.com" rel="ugc">www.ncp-e.com</a>).
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NAT Traversal only relates to Site to Site and you say this is client to Gateway. NAT Traversal should be handled by the client.

What client software do you use?  I use NCP Secure Entry (www.ncp-e.com [http://www.ncp-e.com]).

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we have used TheGreenBow VPN Client, did not test with any other VPN clients...
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we have used TheGreenBow VPN Client, did not test with any other VPN clients...

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Try a trial version of NCP to see if it works. It is bomb-proof for me.
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Try a trial version of NCP to see if it works. It is bomb-proof for me.

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I could, but the problem is most likely on the TP-LINK router...
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I could, but the problem is most likely on the TP-LINK router...

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<div class="content wysiwyg-content">
We have issues while setting up client VPN on TP-LINK TL-ER6120 and TL-ER6020 routers. Even when it is connected, we are unable to ping the inside hosts.
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We have issues while setting up client VPN on TP-LINK TL-ER6120 and TL-ER6020 routers. Even when it is connected, we are unable to ping the inside hosts.

Client IPSEC VPN on TP-LINK routers

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Internet Protocol Security (IPsec) is a protocol suite for secure Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session. IPsec includes protocols for establishing mutual authentication between agents at the beginning of the session and negotiation of cryptographic keys to be used during the session. IPsec can be used in protecting data flows between a pair of hosts (host-to-host), between a pair of security gateways (network-to-network), or between a security gateway and a host (network-to-host). IPsec is an end-to-end security scheme operating in the Internet Layer of the Internet Protocol Suite.

Internet Protocol Security

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.