Index N

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NAMEINARGS flag for xinetd 
NAT gateway, canonical client hostname and 
National Infrastructure Protection Center (NIPC) (U.S.) 
    home page 
National Institutes of Health, ÒNetwork and Network Monitoring SoftwareÓ page 
nc command
    -u option (for UDP ports) 
    probing ports with 
netgroups
    customizing shosts.equiv file to restrict hostbased authentication 
    defining 
Netscape, certificate storage 
netstat command
    --all option 
    --inet option (printing active connections) 
    --listening option 
    -e option (adding username) 
    -p option (process ID and command name for each socket) 
    /proc files, reading 
    conversion of IP addresses to hostnames 
    examining network state on your machines 
    printing summary of network use 
    summary for networking on a machine 
network (/etc/init.d startup file) 
network configuration of your systems, attack vulnerability and 
network filesystems
    remote integrity checks 
    searching 
    snooping with filesnarf 
network interfaces 
    bringing up 
network intrusion detection systems (NIDS) 
    attacks against 
    rapid development in 
    Snort  [See Snort]
network monitoring tools
    NIH page 
    web page information on 
network protocols, detecting insecure 
network script 
network services, access control facilities 
network switches, packet sniffers and 
networking
    /proc/net/tcp and /proc/net/upd files 
    disabling for secure integrity checks 
    monitoring and intrusion detection  [See intrusion detection for networks monitoring systems for suspicious activity]
    summary for, printing with netstat 
networks
    access control  [See also firewalls]
        adding a new service (inetd) 
        adding a new service (xinetd) 
        denial-of-service attacks, preventing 
        enabling/disabling a service 
        levels of control 
        listing network interfaces 
        logging access to services 
        prohibiting root logins on terminal devices 
        redirecting connections to another socket 
        restricting access by remote hosts (inetd) 
        restricting access by remote hosts (xinetd with libwrap) 
        restricting access by remote hosts (xinetd with tcpd) 
        restricting access by remote hosts (xinetd) 
        restricting access by remote users 
        restricting access to service by time of day 
        restricting access to SSH server by account 
        restricting access to SSH server by host 
        restricting services to specific directories 
        starting/stopping network interface 
    hacks, system recovery from 
    intrusion detection  [See intrusion detection for networks Snort]
    local activities, examining 
        /proc filesystem 
        lsof command, examining processes 
        printing summary of use with netstat 
    monitoring traffic on 
        observing via GUI 
        searching for strings in 
    protecting outgoing traffic 
        authenticating between SSH2 client and OpenSSH server 
        authenticating between SSH2 server and OpenSSH client with OpenSSH key 
        authenticating between SSH2 server and OpenSSH client with SSH2 key 
        authenticating by public key in OpenSSH 
        authenticating by trusted host 
        authenticating in cron jobs 
        authenticating interactively without password 
        copying files remotely 
        invoking remote programs 
        keeping track of passwords 
        logging into remote host 
        SSH client defaults, changing 
        SSH, using 
        tailoring SSH per host 
        terminating SSH agent on logout 
        tunneling TCP connection through SSH 
    refusal of connections by system logger 
    tracing system calls  2nd 
Newsgroups application (Mozilla) 
NFS  [See network filesystems]
ngrep program 
    -A option, printing extra packets for trailing context 
    -T option (relative times between packets) 
    -t option (timestamps) 
    -X option (searching for binary data) 
    detecting use of insecure protocols 
    download site 
    home page for 
    libcap-format network trace files 
    searching network traffic for data matching extended regular expressions 
NIDS  [See network intrusion detection systems Snort]
nmap command 
    -r option, sequential port scan 
    host discovery, use of TCP and ICMP pings 
    information gathered in network security testing 
    probing a single target 
    running as root 
    scanning range of addresses 
    stealth options, using to test logging and intrusion detection 
    testing for open ports 
        -O option for operating system fingerprints 
        -sU options (for UDP ports) 
        customizing number and ranges of ports scanned 
        port scans 
    testing for vulnerabilities of specific network services 
nmapfe program  2nd 
nmh (mail handler) 
NNTP, tunneling with SSH  2nd 
no_access keyword, xinetd.conf 
non-local mail (acceptance by SMTP server) 
noninteractive commands, invoking securely on remote machine 
NOPASSWD tag (sudo command) 
notice priority, system messages 
null-terminated filenames