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I have centos server and installed the VPN client(cisco-vpnclient) and able to connect to the server on the other side using private address and the server on the other side pingable using the private address .

The question

But the other side can not connect to my server using private address such as: when the other side try to ping my server using the private ip do not get any response.

is VPN client working one way ( just send the data to VPN server and do not receive the data) ?

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It depends on the configuration of both the machine which you are VPNing from as well as the VPN, but it can be setup to allow communication in both directions.

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It does depend greatly on the configuration of the vpn. You'll want to look (with enable access) at the VPN endpoint, show access-lists and perhaps show run and see where access has been permitted too.

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