EAP (Extensible Authentication Protocol), 19, 55
deployment, 217, 250, 253, 259, 260
described, 22, 40
site-to-site VPNs, 217
two-factor authentication, 22
EAP-MD5 (Extensible Authentication Protocol- Message Digest 5), 188
EAP-Response/Identity messages, 290, 304
EAP-TLS (EAP-Transport Layer Security)
authentication issues, 289–292
certificates, 74, 97, 98, 99
configuring, 98, 212, 213
deployment, 117, 206, 212, 213, 227, 249
described, 45
enabling, 227
MPPE, 40
policies, 117
site-to-site VPNs, 181, 183–184, 188, 202, 227,
302–306
smart cards, 74, 97
troubleshooting, 289–292, 302–306
ECI Telematics, 54
EIGRP (Enhanced Interior Gateway Protocol), 194
EKU (Enhanced Key Usage), 290, 304, 306
e-mail, key role of, 6
Enable Certificate Templates option, 208
Enable File Tracing option, 281
Enable Security On The Selected Interface By Setting Up Static Packet Filters option, 78, 179
EnableLogging registry setting, 282
encapsulation. See also ESP (Encapsulating Security Payload)
described, 17
tunneling, 12, 17
encryption. See also cryptography; encryption keys
certificates, 211, 213
Connection Manager, 141, 144
deployment, 118, 211, 213, 227, 250, 253, 259
described, 38, 41–43
IAS, 227
L2TP/IPSec, 25
policies, 118
PPTP, 24, 25
profiles, 92
quarantine features, 141, 144
requirements, 16
site-to-site VPNs, 177, 188, 197, 200, 227
strengths, 92, 197
tunneling, 20
encryption keys, 16, 20. See also encryption; private-key encryption; public-key encryption
generation timeframe, 43
length, 42
preshared, 54, 55
site-to-site VPNs, 188, 190
Enhanced Interior Gateway Protocol (EIGRP). See EIGRP (Enhanced Interior Gateway Protocol)
Enhanced Key Usage (EKU). See EKU (Enhanced Key Usage)
Enhanced Key Usage field, 290, 291, 304, 306
Enroll Certificates Automatically option, 109, 150
errors, destination unreachable, 71
ESP (Encapsulating Security Payload), 24, 25, 190, 226
Ethernet, 6, 240, 245
event logging, 279, 298
Everyone group, 287, 300
Export File Format page, 211
Export The Private Key option, 210
Extensible Authentication Protocol (EAP). See EAP (Extensible Authentication Protocol)
Extensible Authentication Protocol-Message Digest 5 (EAP-MD5). See EAP-MD5 (Extensible Authentication Protocol-Message Digest 5)
extranets
business partners, 265–270
deployment, 265-270
described, 48
domain configuration, 266
L2TP/IPSec, 269–270
packet filtering, 48
PPTP, 268–269
remote access policy configuration, 267
extrapolation layer, 229