Index_L

L

L2TP (Layer Two Tunneling Protocol). See also L2TP/IPSec (Layer Two Tunneling Protocol/ Internet Protocol Security)

Connection Manager, 142, 168

deployment, 217

described, 18, 23

ports, 81

quarantine features, 142, 168

site-to-site VPNs, 299

troubleshooting, 299

tunneling, 18–20

VPN servers, 81

L2TP/IPSec (Layer Two Tunneling Protocol/ Internet Protocol Security). See also L2TP (Layer Two Tunneling Protocol)

advantages, 25, 38, 52, 55

authentication, 40, 301–302

certificates, 28–30, 69, 96, 99, 201

clients, 64, 70, 250

Connection Manager, 67, 128, 129, 140

deployment, 102, 118, 205, 214, 217, 221

Downlevel VPN Client for Microsoft Windows, 52

encryption, 42

extranets, 269–270

future directions, 58

interoperability, 51–53, 57–59

IPSec TM, 26

NAT-T, 72

OSPF, 240

packet filtering, 44

policies, 118

PPTP, 24–28, 76

preshared keys, 28–30

quarantine features, 140

routing, 183, 217, 221

site-to-site VPNs, 184, 188–191, 201, 217, 221, 240

L2TP/IPSec (Layer Two Tunneling Protocol/ Internet Protocol Security) (continued)

troubleshooting, 285, 288, 299, 301–302

unable to connect problems, 301–302

vendors, 59

when to use, 75–77

LANs (local-area networks), 14, 29, 250, 256

site-to-site VPNs, 15, 175, 181, 297, 309

troubleshooting, 297, 309

VPN servers, 79

latency, 233

Layer Two Tunneling Protocol (L2TP). See L2TP (Layer Two Tunneling Protocol)

Layer Two Tunneling Protocol/Internet Protocol Security (L2TP/IPSec). See L2TP/IPSec (Layer Two Tunneling Protocol/Internet Protocol Security)

LCP (Link Control Protocol), 20

LDAP (Lightweight Directory Access Protocol), 56

leased lines, 13

License Agreement page, 164

Lightweight Directory Access Protocol (LDAP). See LDAP (Lightweight Directory Access Protocol)

Link Control Protocol (LCP). See LCP (Link Control Protocol)

link state advertisement (LSA). See LSA (link state advertisement)

load balancing, 31

Local File object, 90, 195, 196, 279

local-area networks (LANs). See LANs (local-area networks)

lockout features, 47, 283, 297

Log Additional Routing And Remote Access Information option, 280, 281

Log All Events option, 279

Log Errors And Warnings option, 279

Log File tab, 115, 225

log files

AAA infrastructure, 95, 195

accounting providers, 90

configuring, 115, 224

deployment, 115

enabling, 115

IAS, 90, 95

local, 90

Oakley, 281, 302

saving, 279

site-to-site VPNs, 180, 195

SQL-XML, 90, 95

troubleshooting, 278–280

LogFiles folder, 279

Logging tab, 279, 280

logon. See also authentication; passwords

ISPs, 69

single sign-on, 69

site-to-site VPNs, 178, 198

user accounts, 198

LSA (link state advertisement), 239