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L2TP (Layer 2 Tunneling Protocol), 252
LAND attacks, 25
Language, general, 531
LANguard tool (GFI), 979
Large-packet ping attacks, 25
LAT. see Local Address Table (LAT)
Layer 2 Tunneling Protocol (L2TP), 252
LDAP. see Lightweight Directory Access Protocol (LDAP)
LDAP account management panel (FireWall-1), 521
LEDs, meanings of, 372
Left angle bracket (<), 321
Legacy mode. see ClusterXL (Check Point)
lib directory, 622
libpcap packet capture library, 1212–1215, 1217
License Repository, 522–523
Licenses
15-day trial period, 743
configuration of, 628–629
expired, 523
Server, ISA, installation of, 849
VPN-1/FireWall-1 NG, 423–424
VPN-1/FireWall-1 NG on Solaris, 466–467
VPN-1/FireWall-1 NG on Windows, 444–446
Licensing
DVMRP and IGRP routing protocols, 678
management of, 521
PIX 500 series firewalls, 259–261
Lightweight Directory Access Protocol (LDAP), 333–334, 512, 521, 530
Linux firewalls
anti-spoofing rules, 152–155
chains, user-defined, 139
connectivity, troubleshooting, 175
GUI tools, 159–160
Heimdall Linuxconf Firewall, 160
interface, specifying, 139–140
kernel, configuring, 137
logging tools, 207–208
logs, viewing with firelogd, 186–191
logs, viewing with fwlogwatch, 191–207
multiple terminals, 178
Netcat testing tool, 178–182
packet accounting, 137, 155–156
packet-filtering rules, 147
packet generators, 177
packets, logging, 146–147
policies, setting, 140–143
port scanners, 177
requirements, 131
rule checkers, 176
scripts, 159–160
SendIP packet forger, 182–185
tables and chains, 138
targets, built-in, 139
Telnet for testing, 177
testing, 172–173
type of service (ToS), 156–159
see also Ipchains; Iptables
Linux operating system
distributions, 1210–1212
installation, 1216–1217
Listening port, SSL, 1142
Literal port names, 286
Literal protocol names, 285
Load-balancing
ISA Server, 968–970
Windows 2000, 969
Load-sharing versus high availability, 715, 727
Local Address Table (LAT), 824–825, 851, 1007–1008
Local gateways, 583–584, 586–587, 593
Log and Alert panel (FireWall-1), 521
log directory, 622
Log Viewer tool, 524–525
logging command (PIX firewalls), 266
LogGrep log tool, 207
Logical server group, 501–502
login command (PIX firewalls), 265
Logins, failed, tolerance for, 520
logout command (PIX firewalls), 265, 266
Logs
checking, 382
extensive, 535
ISA Server, 819
maintaining, 623
minimizing, 409
performance, ISA Server, 958–961
viewing with firelogd, 186–191
Windows 2000 Event Viewer, 997–998
see also System logging, IPSO
Loopback address, 664
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