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H.32X Series Standards, 904
H.323 Gatekeepers
Administration tool, 851
object, 887, 903–904
service, 851
HA. see High availability (HA)
HA New or Legacy mode. see ClusterXL (Check Point)
Hackers
hybrid, 15
profit-motivated, 13–14
recreational, 13
vengeful, 14–15
Half scans, 16
Handshake, 243
Hardware
monitoring available space, 174
solutions for HA, 575
troubleshooting, 370–378
Hardware Compatibility List (HCL), 1006
Hash functions, 581–582, 786
Header fields
Internet Protocol (IP), 247
Transmission Control Protocol (TCP), 248
Heartbeat checks, interval between, 521
Heimdall Linuxconf Firewall, 160
help command (PIX firewalls), 265, 266
Help files, ISA Server, 999–1002
HIDS (host-based intrusion detection system), 115
High availability (HA)
bootups, 559
configuration panels (FireWall-1), 521
description, 715
hardware solutions, 575
performance tuning, 799–807
PIX firewalls, 254
routing failover, 574–575
security policies, 551
UAS High Availability group, 500
see also Check Point High Availability (CPHA) module
High availability or load-sharing for clusters, 715, 727
History
of firewalls, 58
of insecurity, 4–8
of routers, 244
history command (PIX firewalls), 265
Host-based intrusion detection system (HIDS), 115
Host keys, 667
hostname command (PIX firewalls), 268
Hosts table in IPSO, 664–665
Hot Standby Routing Protocol (HSRP), 574
HTTP. see Hypertext Transfer Protocol (HTTP)
HTTPS
enabling for Voyager, 672–674
and HTTP, 545–546
Hubs or network switches for clusters, 719
Hybrid hackers, 15
Hyperterm program, 257–258
Hypertext Transfer Protocol (HTTP)
bridging SSL connections as, 948–950
connection failure, 720
HTTPS, 545–546
PIX firewalls, 321–322
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