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# Index: I

ICMP (Internet Control Message Protocol)
  2.10. Network Management Services
  6.3.3.3. ICMP
  C.5.2. Internet Control Message Protocol
  echo
    8.12.3. ping
    (see also ping program)
  packets, configuring : 8.12.5. Other ICMP Packets
  returning error codes : 6.4.2. Returning ICMP Error Codes
immutable attribute (BSD 4.4-Lite) : 5.8.4.3. Mount filesystems as read-only
inbound
  packets : 6.2.2. Be Careful of `Inbound' Versus `Outbound' Semantics
    filtering rules for : 6.8.6. It Should Apply Rules Separately to Incoming and Outgoing Packets, on a Per-Interface Basis
    Telnet : 6.7.2. Inbound Telnet Service
  services : 10. Authentication and Inbound Services
incident response teams
  13.1.4.2. CERT-CC or other incident response teams
  13.4.4.2. CERT-CC and other incident response teams
  A.5. Response Teams and Other Organizations
  resources for : A.2.2. info.cert.org
incidents
  accidental : 1.2.3. Stupidity and Accidents
  command channel : 8.1. Electronic Mail
  contacting service providers about : 13.4.4.3. Vendors and service providers
  data-driven attacks : 8.1. Electronic Mail
  detecting, plan for : 13.4.1. Planning for Detection
  documenting
    13.1.5. Snapshot the System
    13.1.7. Document the Incident
    planning for : 13.4.5. Planning for Snapshots
  evaluating, plan for : 13.4.2. Planning for Evaluation of the Incident
  having tools and supplies for : 13.5.5. Keeping a Cache of Tools and Supplies
  hijacking : 10.1.1. Hijacking
  intrusions : 1.2.1.1. Intrusion
  multiple failed attacks : 12.2.3. The Good, the Bad, and the Ugly
  notifying people about
    13.1.4. Make `Incident in Progress' Notifications
    13.4.4. Planning for Notification of People Who Need to Know
  password attacks : 10.3.1. One-Time Passwords
  practicing drills for : 13.5.7. Doing Drills
  recovering from : 13.1.6. Restore and Recover
    planning to : 13.4.6. Planning for Restoration and Recovery
  responding to
    12.2.5. Responding to Attacks
    13. Responding to Security Incidents
  reviewing response strategies : 13.4.8. Periodic Review of Plans
  types of : 1.2. What Are You Trying To Protect Against?
incoming directories, FTP : 8.2.1.6. Be careful of writable directories in the anonymous FTP area
inetd : 5.8.2.1. How are services managed?
  modifying for anonymous FTP : 8.2.1.3. Providing anonymous FTP service
information lookup services
  configuring : 8.8. Information Lookup Services
information theft : 1.2.1.3. Information Theft
  espionage : 1.2.2.4. Spies (Industrial and Otherwise)
insecure networks : 4.4.2. Insecure Networks
installing
  filesystems as read-only : 5.8.4.3. Mount filesystems as read-only
  Internet services : 5.8.3. Installing and Modifying Services
  kernel : 5.8.4.1. Reconfigure and rebuild the kernel
  operating system : 5.8.1.1. Start with a minimal clean operating system installation
  software on machine : 5.8.4. Reconfiguring for Production
intelligent proxy servers : 7.3.3. Intelligent Proxy Servers
interior router : 4.2.3.3. Interior router
  configuring : 9.1.2.1. Interior Router
  merging with bastion host : 4.3.4. It's Dangerous to Merge the Bastion Host and the Interior Router
  merging with exterior router : 4.3.2. It's OK to Merge the Interior Router and the Exterior Router
  multiple : 4.3.5. It's Dangerous to Use Multiple Interior Routers
internal
  bastion hosts : 5.2.3. Internal Bastion Hosts
  clients, and proxying : 7.4.5. Internal Versus External Clients
  firewalls : 4.4. Internal Firewalls
    bastion hosts on : 4.4.6. An Internal Firewall May or May Not Need Bastion Hosts
  news server : 8.5.3.4. Relaying news through your bastion host to an internal news server
Internet
  conferencing services, real-time : 2.8. Real-Time Conferencing Services
  connections to unbuilt bastion host : 5.8. Building a Bastion Host
  Control Message Protocol : (see ICMP)
  defense in depth : 3.2. Defense in Depth
  email over : (see email)
  firewalls : (see firewalls)
  future of IP addresses : 4.5. What the Future Holds
  layer, TCP/IP : C.5. Internet Layer
  logging activity on : (see logs)
  multicasting : 8.9.3. The Multicast Backbone (MBONE)
  multiple connections to : 4.3.6. It's OK to Use Multiple Exterior Routers
  Protocol : (see IP)
  Relay Chat : (see IRC)
  routing architecture : C.10. Internet Routing Architecture
  search programs for : 2.6. Other Information Services
  security resource : A.3.5. CERT-Advisory
  services : (see services, Internet)
  WWW : (see WWW (World Wide Web))
intruders
  pursuing and capturing : 13.3. Pursuing and Capturing the Intruder
  recovering from : 13.1.6. Restore and Recover
  reviewing response strategies : 13.4.8. Periodic Review of Plans
  types of : 1.2.2. Types of Attackers
intrusions : (see incidents)
IP (Internet Protocol)
  6.3.2. IP
  C.5.1. Internet Protocol
  addresses
    6.3.6. IP Version 6
    C.9. The IP Address
  encryption : 10.5.2. What Do You Encrypt?
  fragmentation : 6.3.2.2. IP fragmentation
  multicasting : 8.9.3. The Multicast Backbone (MBONE)
  nested over IP : 6.3.3.5. IP over IP
  packet layer : 6.3.1.2. IP layer
  packet routes to : (see traceroute program)
  routers : C.5.1.2. Routing datagrams
  source route option : 6.3.2.1. IP options
  status and control messages : 6.3.3.3. ICMP
  Version 6 (IPv6) : 6.3.6. IP Version 6
IP addresses : 2.9. Name Service
  future of : 4.5. What the Future Holds
  private : 4.5. What the Future Holds
IRC (Internet Relay Chat) : 2.8. Real-Time Conferencing Services
  configuring : 8.9.2. Internet Relay Chat (IRC)
ISS (Internet Security Scanner) : B.2.5. ISS

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