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Resetting a PPPoE session ····································································································································· 53

Displaying and maintaining PPPoE ······························································································································ 54

Displaying and maintaining PPPoE server ·········································································································· 54

Displaying and maintaining PPPoE client ··········································································································· 54

PPPoE configuration examples ······································································································································ 55

PPPoE server configuration example ··················································································································· 55

PPPoE server IP address assignment through the local DHCP server configuration example ······················· 56

PPPoE server IP address assignment through a remote DHCP server configuration example ······················· 57

PPPoE server IPv6 address assignment through ND and IPv6CP negotiation configuration example ········· 59

PPPoE server IPv6 address assignment through DHCPv6 configuration example ·········································· 60

Example for configuring PPPoE server IPv6 address assignment through prefix delegation by DHCPv6 ··· 61

PPPoE client in permanent mode configuration example ·················································································· 62

PPPoE client in on-demand mode configuration example ················································································· 64

PPPoE client in diagnostic mode configuration example ·················································································· 65

Configuration example for connecting a LAN to the Internet through an ADSL modem ······························· 66

Configuring L2TP ························································································································································ 70

Overview ········································································································································································· 70

Typical L2TP networking ······································································································································· 70

L2TP message types and encapsulation structure ······························································································ 71

L2TP tunnel and session ········································································································································ 71

L2TP tunneling modes and tunnel establishment process ·················································································· 71

L2TP features ·························································································································································· 75

Protocols and standards ······································································································································· 77

Command and hardware compatibility ······················································································································ 77

L2TP configuration task list ············································································································································ 77

Configuring basic L2TP capabilities ····························································································································· 78

Configuring an LAC ······················································································································································· 79

Configuring an LAC to initiate tunneling requests for a user ············································································ 79

Specifying LNS IP addresses ································································································································ 79

Configuring the source IP address of L2TP tunnel packets ················································································ 80

Enabling transferring AVP data in hidden mode ······························································································· 80

Configuring AAA authentication on an LAC ······································································································ 80

Configuring an LAC to automatically establish an L2TP tunnel ········································································ 81

Configuring an LNS ······················································································································································· 82

Creating a VT interface ········································································································································ 82

Configuring a VA pool ········································································································································· 83

Configuring an LNS to accept L2TP tunneling requests from a specific LAC ·················································· 83

Configuring user authentication on an LNS ······································································································· 84

Configuring AAA authentication on an LNS ······································································································ 85

Configuring optional L2TP parameters ························································································································ 86

Configuring L2TP tunnel authentication ··············································································································· 86

Setting the Hello interval ······································································································································· 86

Enabling session flow control ······························································································································· 86

Setting the DSCP value of L2TP packets ·············································································································· 87

Assigning a tunnel peer to a VPN ······················································································································· 87

Setting the TSA ID of the LTS ································································································································ 88

Displaying and maintaining L2TP ································································································································· 88

L2TP configuration examples ········································································································································ 89

Configuration example for NAS-initiated L2TP tunnel ······················································································· 89

Configuration example for client-initiated L2TP tunnel ······················································································ 91

Configuration example for LAC-auto-initiated L2TP tunnel ················································································ 92

Troubleshooting L2TP ····················································································································································· 94