Troubleshooting Linux Firewalls

Index

[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z]

odd port detection rules

     example firewall 2ndOpen System Interconnection. [See OSI model]

openswan 2nd     securing wireless networks 2nd 3rd 4th 5th 6th 7th

order of rules 2nd OSI (Open System Interconnection) model

OSI model     troubleshooting         application layers

         drivers         physical connectivity         presentation layers

         session layers

         TCP layers

outbound

     blocking clients from accessing websites 2nd     blocking DHCP 2nd

    FTP

         connections are established, but directories cannot be listed, and files cannot be downloaded 2nd 3rd     inaccessibility of websites

outbound web traffic    transparent proxy servers

         squid 2nd 3rd OUTSIDE-IN test OUTSIDE-IN tests 2nd

     reading output from nmap 2nd 3rd