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What's new in 5.1
=================
General
-------
* all of the tuneables can now be set at any time, not just whilst disabled
or prior to loading rules;
* group identifiers may now be a number or name (universal);
* man pages rewritten
* tunables can now be set via ipf.conf;
Logging
-------
* ipmon.conf can now be used to generate SNMPv1 and SNMPv2 traps using
information from log entries from the kernel;
NAT changes
-----------
* DNS proxy for the kernel that can block queries based on domain names;
* FTP proxy can be configured to limit data connections to one or many
connections per client;
* NAT on IPv6 is now supported;
* rewrite command allows changing both the source and destination address
in a single NAT rule;
* simple encapsulation can now be configured with ipnat.conf,
* TFTP proxy now included;
Packet Filtering
----------------
* acceptance of ICMP packets for "keep state" rules can be refined through
the use of filtering rules;
* alternative form for writing rules using simple filtering expressions;
* CIPSO headers now recognised and analysed for filtering on DOI;
* comments can now be a part of a rule and loaded into the kernel and
thus displayed with ipfstat;
* decapsulation rules allow filtering on inner headers, providing they
are not encrypted;
* interface names, aside from that the packet is on, can be present in
filter rules;
* internally now a single list of filter rules, there is no longer an
IPv4 and IPv6 list;
* rules can now be added with an expiration time, allowing for their
automatic removal after some period of time;
* single file, ipf.conf, can now be used for both IPv4 and IPv6 rules;
* stateful filtering now allows for limits to be placed on the number
of distinct hosts allowed per rule;
Pools
-----
* addresses added to a pool via the command line (only!) can be given
an expiration timeout;
* destination lists are a new type of address pool, primarily for use with
NAT rdr rules, supporting newer algorithms for target selection;
* raw whois information saved to a file can be used to populate a pool;
Solaris
-------
* support for use in zones with exclusive IP instances fully supported.
Tools
-----
* use of matching expressions allows for refining what is displayed or
flushed;
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