Troubleshooting Linux Firewalls

Index

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Layer 2

    transparent firewalls. [See transparent firewalls]length

    of names         DNS lookups

liability     down stream liability

libpcap librarylibraries     libpcap

Linux     ECNlisting

     current NAT and rule packet counters 2nd

     current NAT entries with iptables 2nd

loading

    iptables modules         example firewall 2nd

local firewall security 2nd

local systems     SSH 2nd 3rd

local web servers     running 2nd

log monitoring tools 2nd logchecklogging

     diagnostic logging 2nd 3rd 4th

         catch all rule 2nd

         iptables TRACE patch 2nd

         scripts for 2nd 3rd

logwatch

lookup failures

    DNS

         internal hosts communicating to external name servers

         name length

         name servers running on firewalls 2nd

         name servers running on internal and/or DMZ networks 2nd