Destination network administratively prohibited, ICMP Destination Unreachable
Destination network unknown, ICMP Destination Unreachable
Fragmentation needed and DF set, ICMP Destination Unreachable
Host precedence violation, ICMP Destination Unreachable
Host unreachable, ICMP Destination Unreachable
Host unreachable for TOS, ICMP Destination Unreachable
Network unreachable, ICMP Destination Unreachable
Network unreachable for TOS, ICMP Destination Unreachable
Port unreachable, ICMP Destination Unreachable
Precedence cutoff in effect, ICMP Destination Unreachable
Protocol unreachable, ICMP Destination Unreachable
Source host isolated, ICMP Destination Unreachable
Source route failed, ICMP Destination Unreachable
Destination-port match, TCP matches, UDP matches, SCTP matches, Multiport match
Detailed explanations, Detailed explanations of special commands
Listing rule-sets, Listing your active rule-set
Updating and flushing, Updating and flushing your tables
DHCP, MASQUERADE target, Configuration options, Displacement of rules to different chains
Differentiated Services, IP headers
DiffServ, IP headers
Displacement, Displacement of rules to different chains
Dmesg, LOG target options
DNAT, Terms used in this document, What is an IP filter, What NAT is used for and basic terms and expressions
DNAT target, General, Nat table, DNAT target, PREROUTING chain of the nat table
--to-destination, DNAT target
DNAT target examples, DNAT target
DNS, IP characteristics, The UDP chain
Drawbacks with iptables-restore, Drawbacks with restore
Drop, IP filtering terms and expressions
DROP target, DROP target, The UDP chain, FORWARD chain, OUTPUT chain
DSCP, IP headers
Dscp match, Dscp match
--dscp, Dscp match
--dscp-class, Dscp match
DSCP target, DSCP target
--set-dscp, DSCP target
--set-dscp-class, DSCP target
Dscp-class match, Dscp match
Dst-range match, IP range match
Dst-type match, Addrtype match
Dynamic Host Configuration Protocol (DHCP), rc.DHCP.firewall.txt
E
e-mail, How to plan an IP filter
Easy Firewall Generator, Easy Firewall Generator
ECE, TCP headers
Echo, Bash debugging tips