NAME

       sanewall-protection - add extra protections to a definition

SYNOPSIS

       protection [reverse] flood-protection-type [requests/period [burst]]

       protection [reverse] strong [requests/period [burst]]

       protection [reverse] {bad-packets | packet-protection-type }

DESCRIPTION

       The protection subcommand sets protection rules on an interface or router.

       Flood protections honour the options requests/period and burst. They are used to limit the rate of
       certain types of traffic.

       The default rate Sanewall uses is 100 operations per second with a burst of 50. Run iptables -m limit
       --help for more information.

       The protection type strong will switch on all protections (both packet and flood protections) except
       all-floods. It has aliases full and all.

       The protection type bad-packets will switch on all packet protections but not flood protections.

       You can specify multiple protection types by using multiple protection commands or in a single command by
       enclosing the types in quotes.

           Note

           On a router, protections are normally set up on inface.

           The reverse option will set up the protections on outface. You must use it as the first keyword.

PACKET PROTECTION TYPES

       invalid
           Drops all incoming invalid packets, as detected INVALID by the connection tracker.

           See also SANEWALL_DROP_INVALID in control variables: sanewall-variables(5) which allows setting this
           function globally.

       fragments
           Drops all packet fragments.

           This rule will probably never match anything since iptables(8) reconstructs all packets automatically
           before the firewall rules are processed whenever connection tracking is running.

       new-tcp-w/o-syn
           Drops all TCP packets that initiate a socket but have not got the SYN flag set.

       malformed-xmas
           Drops all TCP packets that have all TCP flags set.

       malformed-null
           Drops all TCP packets that have all TCP flags unset.

       malformed-bad
           Drops all TCP packets that have illegal combinations of TCP flags set.

FLOOD PROTECTION TYPES

       icmp-floods [requests/period [burst]]
           Allows only a certain amount of ICMP echo requests.

       syn-floods [requests/period [burst]]
           Allows only a certain amount of new TCP connections.

           Be careful to not set the rate too low as the rule is applied to all connections regardless of their
           final result (rejected, dropped, established, etc).

       all-floods [requests/period [burst]]
           Allows only a certain amount of new connections.

           Be careful to not set the rate too low as the rule is applied to all connections regardless of their
           final result (rejected, dropped, established, etc).

EXAMPLES

           protection strong

           protection "invalid new-tcp-w/o-syn"

           protection syn-floods 90/sec 40

BUGS

       When using multiple types in a single command, if the quotes are forgotten, incorrect rules will be
       generated without warning.

       When using multiple types in a single command, Sanewall will silently ignore any types that come after a
       group type (bad-packets, strong and its aliases). Only use group types on their own line.

SEE ALSO

           Sanewall program: sanewall(1)
           Sanewall configuration: sanewall.conf(5)
           interface definition: sanewall-interface(5)
           router definition: sanewall-router(5)

AUTHOR

       Sanewall Team

COPYRIGHT

       Copyright © 2012, 2013 Phil Whineray <phil@sanewall.org>

Sanewall 1.0.2                                  Built 01 Jun 2013                         PROTECTION COMMAND:(5)