Linux® Firewalls: Enhancing Security with nftables and Beyond, Fourth Edition

Index

: (colon), command-line syntax, 62

[ ] (square brackets), command-line syntax, 62

# (pound sign), comment indicator, 297

| (pipe symbol), command-line syntax, 62

< > (angle brackets), command-line syntax, 62

0.0.0.0 IP address

definition, 110

denying packets addressed to, 109

255.255.255.255 IP address, denying packets originating from, 109

A

-a option, 224

-a (--handle) option, 85–86

-A option, 224

Accept packet and stop processing, 87

ACCEPT rule

defining a default policy, 106

definition, 351

accept statement, 87

accept-everything-by-default policy, 29–30, 351. See also Default policies.

ACK flag, 16, 351

add command

nftables, chain syntax, 86–87

nftables, table syntax, 85–86

Adding

chains to a table, 86–87

rules, 87

tables, 85–86

Address ...