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![Security for VPNs with IPsec Configuration Guide, Cisco IOS Release 15M&T - L2TP IPsec Support for NAT and PAT Windows Clients [Support] - Cisco](https://www.cisco.com/c/dam/en/us/td/i/100001-200000/130001-140000/135001-136000/135045.ps/_jcr_content/renditions/135045.jpg "Security for VPNs with IPsec Configuration Guide, Cisco IOS Release 15M&T - L2TP IPsec Support for NAT and PAT Windows Clients [Support] - Cisco")