Troubleshooting Linux Firewalls

Index

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package management tools

     apt-get 2nd     emerge 2nd 3rd

     red carpet 2nd     up2date

     yum 2nd packet filtering

packet filtering firewalls 2ndpacket sniffers. [See sniffers]packets

     forwarding for some other host to some other host (FORWARD)    invalid packets rules         example firewall 2nd

     IP packets 2nd

     sent by firewall from a local process to a remote system (OUTPUT)

     sent to service running on firewall from remote host (INPUT)

    shunning         example firewall 2nd

    silently dropping packets

         example firewall 2nd    small packets rules

         example firewall 2nd    string-matching rules

         example firewall 2nd 3rd     TCP     troubleshooting packets that do not pass in or out of a firewall 2nd 3rd 4th 5th 6th

parsing

    rules

         netfilter 2nd 3rd 4th 5th 6th 7th 8th 9th

patch maintenance

patching

     reliance on 2nd

patching iptables

     TRACE patch 2nd

physical connectivity

     troubleshooting OSI model

ping 2nd 3rd 4th 5th

     network diagnostics 2nd

PKI (Public Key Infrastructure)plans     documenting risk management 2nd 3rd

Point to Point Tunneling Protocol. [See PPTP]

policies    implementing

         securing the enterprise

polite rules

     example firewall 2nd

port 80

     filtering out

port scan rules     example firewall 2nd 3rd

PORT STATE SERVICE 2nd POSTROUTING chains

PPTP     (Point to Point Tunneling Protocol)

     connections through firewall 2nd 3rd 4th     internal VPN routing 2nd 3rd 4th     NAT/MASQ firewall connections 2nd 3rd

pptpclient PREROUTING PREROUTING chains

presentation layers

     troubleshooting OSI model

preventing

     networks from being added to routesprivilege

     running services with least privilege 2nd

probing tools 2nd problem solving methodology 2nd

procedures    implementing

         securing the enterpriseprocesses     SMTP 2nd 3rd

protecting

    services

         with TCP wrappers and firewall rules 2nd 3rd 4th 5th 6th 7th 8th

protocols

    ICMP. [See ICMP]

    IP. [See IP]

    TCP. [See TCP]

    UDP. [See UDP]

proxyarp

     disabling

proxys

     GnomeMeeting 2nd 3rd

Public Key Infrastructure (PKI)