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Select VPN > IPsec > IPsec Policies.
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Click Add IPsec Policy.
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For Policy Name, type L2TPipsec.
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For Action, select Apply.
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For Position, type 1.
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For Traffic Selector, configure these settings:
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For Protocol, select UDP.
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For Local Address, select localVPNgate.
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Leave the Local Port field blank.
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For Remote Address, select L2TPclients.
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For Remote Port, type 1701.

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You cannot select (115) L2TP for the traffic selector in this case, because you need L2TP to operate at Layer 4 instead of Layer 3.
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For Proposal, select TResp3Dmd5.
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Click Next.
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Under Filter Actions, select IPsec Negotiation.
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Click the IP Filter List tab and click Add.
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On the IP Filter List window, for Name type L2TP over IPsec and click Add.
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On the Addressing tab, under Source address, select My IP address.
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Under Destination Address, select A specific IP Address.
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For IP address type 172.24.22.99.
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Click the Protocol tab.
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For Select a protocol type, select UDP.
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Under Set the IP protocol port configure the following:
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Select From this port and type 1701.
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Select To this port and type 1701.
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Click OK twice.
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Under IP Filter Lists, select L2TP over IPsec.
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Click Close twice.
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