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https://www.cisco.com/en/US/docs/ios-xml/ios/mp_l3_vpns/configuration/15-1s/ir-l3vpn-mgre.html Dynamic Layer 3 VPNs with Multipoint GRE Tunnels [Support] - Cisco Systems layer 3 gre tunnels dynamic vpns https://lkml.org/lkml/2002/2/1/248 LKML: andrew may: Re: Memory leaks with GRE Tunnels andrew may memory leaks lkml gre tunnels