Unbound is an implementation of a DNS resolver that does caching and DNSSEC validation. It’is written and maintained by NLnet Labs. It’s recursive and caching so if you need an authoritative DNS nameserver please consider using NSD and reading my article “How to configure master and slave NSD on FreeBSD 9.0 “.

I’m going to lead you through an easy step by step guide: install, configure and run Unbound in a chrooted environment with DNSSEC validation.

Install Unbound using the port provided by FreeBSD

cd /usr/ports/dns/unbound
make install clean

Now change directory to prepare the tree to allow a chrooted Unbound:

cd /usr/local/etc/unbound
cp unbound.conf.sample unbound.conf
mkdir dev log run
echo "devfs /usr/local/etc/unbound/dev devfs rw 0 0" >> /etc/fstab
echo 'devfs_set_rulesets="/usr/local/etc/unbound/dev=devfsrules_unbound"' >> /etc/rc.conf
echo '[devfsrules_unbound=5]
add path log unhide
add path null unhide
add path zero unhide
add path crypto unhide
add path random unhide
add path urandom unhide' >> /etc/defaults/devfs.rules
mount /usr/local/etc/unbound/dev
/etc/rc.d/devfs restart

Fetch some files Unbound needs:
named.cache from Internic to provide recursion
fetch ftp://ftp.internic.net/domain/named.cache

root.key from IANA to verify DNSSEC extensions
unbound-anchor -a "/usr/local/etc/unbound/root.key"

dlv.isc.org.key from ISC to verify DNSSEC extensions
fetch http://ftp.isc.org/www/dlv/dlv.isc.org.key

Generate the keys Unbound needs to be safely controlled via unbound-control:
unbound-control-setup

You can now edit unbound.conf:
vi unbound.conf

Feel free to use the following one slightly edited to run chrooted with DNSSEC validation and to serve clients from 192.0.2.0/24 subnet:

#
# Example configuration file.
#
# See unbound.conf(5) man page, version 1.4.16.
#
# this is a comment.
#Use this to include other text into the file.
#include: "otherfile.conf"
# The server clause sets the main parameters.
server:
# whitespace is not necessary, but looks cleaner.
# verbosity number, 0 is least verbose. 1 is default.
verbosity: 2
# print statistics to the log (for every thread) every N seconds.
# Set to "" or 0 to disable. Default is disabled.
# statistics-interval: 0
# enable cumulative statistics, without clearing them after printing.
# statistics-cumulative: no
# enable extended statistics (query types, answer codes, status)
# printed from unbound-control. default off, because of speed.
# extended-statistics: no
# number of threads to create. 1 disables threading.
# num-threads: 1
# specify the interfaces to answer queries from by ip-address.
# The default is to listen to localhost (127.0.0.1 and ::1).
# specify 0.0.0.0 and ::0 to bind to all available interfaces.
# specify every interface[@port] on a new 'interface:' labelled line.
# The listen interfaces are not changed on reload, only on restart.
# interface: 192.0.2.153
# interface: 192.0.2.154
# interface: [email protected]
# interface: 2001:DB8::5
interface: 0.0.0.0
interface: ::0
# enable this feature to copy the source address of queries to reply.
# Socket options are not supported on all platforms. experimental.
# interface-automatic: no
# port to answer queries from
# port: 53
# specify the interfaces to send outgoing queries to authoritative
# server from by ip-address. If none, the default (all) interface
# is used. Specify every interface on a 'outgoing-interface:' line.
# outgoing-interface: 192.0.2.153
# outgoing-interface: 2001:DB8::5
# outgoing-interface: 2001:DB8::6
# number of ports to allocate per thread, determines the size of the
# port range that can be open simultaneously. About double the
# num-queries-per-thread, or, use as many as the OS will allow you.
# outgoing-range: 4096
# permit unbound to use this port number or port range for
# making outgoing queries, using an outgoing interface.
# outgoing-port-permit: 32768
# deny unbound the use this of port number or port range for
# making outgoing queries, using an outgoing interface.
# Use this to make sure unbound does not grab a UDP port that some
# other server on this computer needs. The default is to avoid
# IANA-assigned port numbers.
# outgoing-port-avoid: "3200-3208"
# number of outgoing simultaneous tcp buffers to hold per thread.
# outgoing-num-tcp: 10
# number of incoming simultaneous tcp buffers to hold per thread.
# incoming-num-tcp: 10
# buffer size for UDP port 53 incoming (SO_RCVBUF socket option).
# 0 is system default. Use 4m to catch query spikes for busy servers.
# so-rcvbuf: 0
# buffer size for UDP port 53 outgoing (SO_SNDBUF socket option).
# 0 is system default. Use 4m to handle spikes on very busy servers.
# so-sndbuf: 0
# EDNS reassembly buffer to advertise to UDP peers (the actual buffer
# is set with msg-buffer-size). 1480 can solve fragmentation (timeouts).
# edns-buffer-size: 4096
# buffer size for handling DNS data. No messages larger than this
# size can be sent or received, by UDP or TCP. In bytes.
# msg-buffer-size: 65552
# the amount of memory to use for the message cache.
# plain value in bytes or you can append k, m or G. default is "4Mb".
# msg-cache-size: 4m
# the number of slabs to use for the message cache.
# the number of slabs must be a power of 2.
# more slabs reduce lock contention, but fragment memory usage.
# msg-cache-slabs: 4
# the number of queries that a thread gets to service.
# num-queries-per-thread: 1024
# if very busy, 50% queries run to completion, 50% get timeout in msec
# jostle-timeout: 200
# the amount of memory to use for the RRset cache.
# plain value in bytes or you can append k, m or G. default is "4Mb".
# rrset-cache-size: 4m
# the number of slabs to use for the RRset cache.
# the number of slabs must be a power of 2.
# more slabs reduce lock contention, but fragment memory usage.
# rrset-cache-slabs: 4
# the time to live (TTL) value lower bound, in seconds. Default 0.
# If more than an hour could easily give trouble due to stale data.
# cache-min-ttl: 0
# the time to live (TTL) value cap for RRsets and messages in the
# cache. Items are not cached for longer. In seconds.
# cache-max-ttl: 86400
# the time to live (TTL) value for cached roundtrip times, lameness and
# EDNS version information for hosts. In seconds.
# infra-host-ttl: 900
# the number of slabs to use for the Infrastructure cache.
# the number of slabs must be a power of 2.
# more slabs reduce lock contention, but fragment memory usage.
# infra-cache-slabs: 4
# the maximum number of hosts that are cached (roundtrip, EDNS, lame).
# infra-cache-numhosts: 10000
# Enable IPv4, "yes" or "no".
# do-ip4: yes
# Enable IPv6, "yes" or "no".
# do-ip6: yes
# Enable UDP, "yes" or "no".
# do-udp: yes
# Enable TCP, "yes" or "no".
# do-tcp: yes
# upstream connections use TCP only (and no UDP), "yes" or "no"
# useful for tunneling scenarios, default no.
# tcp-upstream: no
# Detach from the terminal, run in background, "yes" or "no".
# do-daemonize: yes
# control which clients are allowed to make (recursive) queries
# to this server. Specify classless netblocks with /size and action.
# By default everything is refused, except for localhost.
# Choose deny (drop message), refuse (polite error reply),
# allow (recursive ok), allow_snoop (recursive and nonrecursive ok)
access-control: 0.0.0.0/0 refuse
access-control: 127.0.0.0/8 allow
access-control: ::0/0 refuse
access-control: ::1 allow
access-control: ::ffff:127.0.0.1 allow
access-control: 192.0.2.0/24 allow
# if given, a chroot(2) is done to the given directory.
# i.e. you can chroot to the working directory, for example,
# for extra security, but make sure all files are in that directory.
#
# If chroot is enabled, you should pass the configfile (from the
# commandline) as a full path from the original root. After the
# chroot has been performed the now defunct portion of the config
# file path is removed to be able to reread the config after a reload.
#
# All other file paths (working dir, logfile, roothints, and
# key files) can be specified in several ways:
# o as an absolute path relative to the new root.
# o as a relative path to the working directory.
# o as an absolute path relative to the original root.
# In the last case the path is adjusted to remove the unused portion.
#
# The pid file can be absolute and outside of the chroot, it is
# written just prior to performing the chroot and dropping permissions.
#
# Additionally, unbound may need to access /dev/random (for entropy).
# How to do this is specific to your OS.
#
# If you give "" no chroot is performed. The path must not end in a /.
chroot: "/usr/local/etc/unbound"
# if given, user privileges are dropped (after binding port),
# and the given username is assumed. Default is user "unbound".
# If you give "" no privileges are dropped.
username: "unbound"
# the working directory. The relative files in this config are
# relative to this directory. If you give "" the working directory
# is not changed.
directory: "/usr/local/etc/unbound"
# the log file, "" means log to stderr.
# Use of this option sets use-syslog to "no".
logfile: "/usr/local/etc/unbound/log/unbound.log"
# Log to syslog(3) if yes. The log facility LOG_DAEMON is used to
# log to, with identity "unbound". If yes, it overrides the logfile.
# use-syslog: yes
# print UTC timestamp in ascii to logfile, default is epoch in seconds.
# log-time-ascii: no
# print one line with time, IP, name, type, class for every query.
log-queries: yes
# the pid file. Can be an absolute path outside of chroot/work dir.
pidfile: "/usr/local/etc/unbound/run/unbound.pid"
# file to read root hints from.
# get one from ftp://FTP.INTERNIC.NET/domain/named.cache
root-hints: "/usr/local/etc/unbound/named.cache"
# enable to not answer id.server and hostname.bind queries.
# hide-identity: no
# enable to not answer version.server and version.bind queries.
# hide-version: no
# the identity to report. Leave "" or default to return hostname.
# identity: ""
# the version to report. Leave "" or default to return package version.
# version: ""
# the target fetch policy.
# series of integers describing the policy per dependency depth.
# The number of values in the list determines the maximum dependency
# depth the recursor will pursue before giving up. Each integer means:
# -1 : fetch all targets opportunistically,
# 0: fetch on demand,
# positive value: fetch that many targets opportunistically.
# Enclose the list of numbers between quotes ("").
# target-fetch-policy: "3 2 1 0 0"
# Harden against very small EDNS buffer sizes.
# harden-short-bufsize: no
# Harden against unseemly large queries.
# harden-large-queries: no
# Harden against out of zone rrsets, to avoid spoofing attempts.
# harden-glue: yes
# Harden against receiving dnssec-stripped data. If you turn it
# off, failing to validate dnskey data for a trustanchor will
# trigger insecure mode for that zone (like without a trustanchor).
# Default on, which insists on dnssec data for trust-anchored zones.
# harden-dnssec-stripped: yes
# Harden against queries that fall under dnssec-signed nxdomain names.
# harden-below-nxdomain: no
# Harden the referral path by performing additional queries for
# infrastructure data. Validates the replies (if possible).
# Default off, because the lookups burden the server. Experimental
# implementation of draft-wijngaards-dnsext-resolver-side-mitigation.
# harden-referral-path: no
# Use 0x20-encoded random bits in the query to foil spoof attempts.
# This feature is an experimental implementation of draft dns-0x20.
# use-caps-for-id: no
# Enforce privacy of these addresses. Strips them away from answers.
# It may cause DNSSEC validation to additionally mark it as bogus.
# Protects against 'DNS Rebinding' (uses browser as network proxy).
# Only 'private-domain' and 'local-data' names are allowed to have
# these private addresses. No default.
# private-address: 10.0.0.0/8
# private-address: 172.16.0.0/12
# private-address: 192.168.0.0/16
# private-address: 169.254.0.0/16
# private-address: fd00::/8
# private-address: fe80::/10
# Allow the domain (and its subdomains) to contain private addresses.
# local-data statements are allowed to contain private addresses too.
# private-domain: "example.com"
# If nonzero, unwanted replies are not only reported in statistics,
# but also a running total is kept per thread. If it reaches the
# threshold, a warning is printed and a defensive action is taken,
# the cache is cleared to flush potential poison out of it.
# A suggested value is 10000000, the default is 0 (turned off).
# unwanted-reply-threshold: 0
# Do not query the following addresses. No DNS queries are sent there.
# List one address per entry. List classless netblocks with /size,
# do-not-query-address: 127.0.0.1/8
# do-not-query-address: ::1
# if yes, the above default do-not-query-address entries are present.
# if no, localhost can be queried (for testing and debugging).
# do-not-query-localhost: yes
# if yes, perform prefetching of almost expired message cache entries.
# prefetch: no
# if yes, perform key lookups adjacent to normal lookups.
# prefetch-key: no
# module configuration of the server. A string with identifiers
# separated by spaces. "iterator" or "validator iterator"
# module-config: "validator iterator"
# File with trusted keys, kept uptodate using RFC5011 probes,
# initial file like trust-anchor-file, then it stores metadata.
# Use several entries, one per domain name, to track multiple zones.
#
# If you want to perform DNSSEC validation, run unbound-anchor before
# you start unbound (i.e. in the system boot scripts). And enable:
# Please note usage of unbound-anchor root anchor is at your own risk
# and under the terms of our LICENSE (see that file in the source).
auto-trust-anchor-file: "/usr/local/etc/unbound/root.key"
# File with DLV trusted keys. Same format as trust-anchor-file.
# There can be only one DLV configured, it is trusted from root down.
# Download http://ftp.isc.org/www/dlv/dlv.isc.org.key
dlv-anchor-file: "dlv.isc.org.key"
# File with trusted keys for validation. Specify more than one file
# with several entries, one file per entry.
# Zone file format, with DS and DNSKEY entries.
# Note this gets out of date, use auto-trust-anchor-file please.
# trust-anchor-file: ""
# Trusted key for validation. DS or DNSKEY. specify the RR on a
# single line, surrounded by "". TTL is ignored. class is IN default.
# Note this gets out of date, use auto-trust-anchor-file please.
# (These examples are from August 2007 and may not be valid anymore).
# trust-anchor: "nlnetlabs.nl. DNSKEY 257 3 5 AQPzzTWMz8qSWIQlfRnPckx2BiVmkVN6LPupO3mbz7FhLSnm26n6iG9N Lby97Ji453aWZY3M5/xJBSOS2vWtco2t8C0+xeO1bc/d6ZTy32DHchpW 6rDH1vp86Ll+ha0tmwyy9QP7y2bVw5zSbFCrefk8qCUBgfHm9bHzMG1U BYtEIQ=="
# trust-anchor: "jelte.nlnetlabs.nl. DS 42860 5 1 14D739EB566D2B1A5E216A0BA4D17FA9B038BE4A"
# File with trusted keys for validation. Specify more than one file
# with several entries, one file per entry. Like trust-anchor-file
# but has a different file format. Format is BIND-9 style format,
# the trusted-keys { name flag proto algo "key"; }; clauses are read.
# you need external update procedures to track changes in keys.
# trusted-keys-file: ""
# Ignore chain of trust. Domain is treated as insecure.
# domain-insecure: "example.com"
# Override the date for validation with a specific fixed date.
# Do not set this unless you are debugging signature inception
# and expiration. "" or "0" turns the feature off. -1 ignores date.
# val-override-date: ""
# The time to live for bogus data, rrsets and messages. This avoids
# some of the revalidation, until the time interval expires. in secs.
# val-bogus-ttl: 60
# The signature inception and expiration dates are allowed to be off
# by 10% of the signature lifetime (expir-incep) from our local clock.
# This leeway is capped with a minimum and a maximum. In seconds.
# val-sig-skew-min: 3600
# val-sig-skew-max: 86400
# Should additional section of secure message also be kept clean of
# unsecure data. Useful to shield the users of this validator from
# potential bogus data in the additional section. All unsigned data
# in the additional section is removed from secure messages.
# val-clean-additional: yes
# Turn permissive mode on to permit bogus messages. Thus, messages
# for which security checks failed will be returned to clients,
# instead of SERVFAIL. It still performs the security checks, which
# result in interesting log files and possibly the AD bit in
# replies if the message is found secure. The default is off.
# val-permissive-mode: no
# Ignore the CD flag in incoming queries and refuse them bogus data.
# Enable it if the only clients of unbound are legacy servers (w2008)
# that set CD but cannot validate themselves.
# ignore-cd-flag: no
# Have the validator log failed validations for your diagnosis.
# 0: off. 1: A line per failed user query. 2: With reason and bad IP.
# val-log-level: 0
# It is possible to configure NSEC3 maximum iteration counts per
# keysize. Keep this table very short, as linear search is done.
# A message with an NSEC3 with larger count is marked insecure.
# List in ascending order the keysize and count values.
# val-nsec3-keysize-iterations: "1024 150 2048 500 4096 2500"
# instruct the auto-trust-anchor-file probing to add anchors after ttl.
# add-holddown: 2592000 # 30 days
# instruct the auto-trust-anchor-file probing to del anchors after ttl.
# del-holddown: 2592000 # 30 days
# auto-trust-anchor-file probing removes missing anchors after ttl.
# If the value 0 is given, missing anchors are not removed.
# keep-missing: 31622400 # 366 days
# the amount of memory to use for the key cache.
# plain value in bytes or you can append k, m or G. default is "4Mb".
# key-cache-size: 4m
# the number of slabs to use for the key cache.
# the number of slabs must be a power of 2.
# more slabs reduce lock contention, but fragment memory usage.
# key-cache-slabs: 4
# the amount of memory to use for the negative cache (used for DLV).
# plain value in bytes or you can append k, m or G. default is "1Mb".
# neg-cache-size: 1m
# a number of locally served zones can be configured.
# local-zone:
# local-data: ""
# o deny serves local data (if any), else, drops queries.
# o refuse serves local data (if any), else, replies with error.
# o static serves local data, else, nxdomain or nodata answer.
# o transparent gives local data, but resolves normally for other names
# o redirect serves the zone data for any subdomain in the zone.
# o nodefault can be used to normally resolve AS112 zones.
# o typetransparent resolves normally for other types and other names
#
# defaults are localhost address, reverse for 127.0.0.1 and ::1
# and nxdomain for AS112 zones. If you configure one of these zones
# the default content is omitted, or you can omit it with 'nodefault'.
#
# If you configure local-data without specifying local-zone, by
# default a transparent local-zone is created for the data.
#
# You can add locally served data with
# local-zone: "local." static
# local-data: "mycomputer.local. IN A 192.0.2.51"
# local-data: 'mytext.local TXT "content of text record"'
#
# You can override certain queries with
# local-data: "adserver.example.com A 127.0.0.1"
#
# You can redirect a domain to a fixed address with
# (this makes example.com, www.example.com, etc, all go to 192.0.2.3)
# local-zone: "example.com" redirect
# local-data: "example.com A 192.0.2.3"
#
# Shorthand to make PTR records, "IPv4 name" or "IPv6 name".
# You can also add PTR records using local-data directly, but then
# you need to do the reverse notation yourself.
# local-data-ptr: "192.0.2.3 www.example.com"
# service clients over SSL (on the TCP sockets), with plain DNS inside
# the SSL stream. Give the certificate to use and private key.
# default is "" (disabled). requires restart to take effect.
# ssl-service-key: "path/to/privatekeyfile.key"
# ssl-service-pem: "path/to/publiccertfile.pem"
# ssl-port: 443
# request upstream over SSL (with plain DNS inside the SSL stream).
# Default is no. Can be turned on and off with unbound-control.
# ssl-upstream: no
# Python config section. To enable:
# o use --with-pythonmodule to configure before compiling.
# o list python in the module-config string (above) to enable.
# o and give a python-script to run.
python:
# Script file to load
# python-script: "/usr/local/etc/unbound/ubmodule-tst.py"
# Remote control config section.
remote-control:
# Enable remote control with unbound-control(8) here.
# set up the keys and certificates with unbound-control-setup.
control-enable: yes
# what interfaces are listened to for remote control.
# give 0.0.0.0 and ::0 to listen to all interfaces.
control-interface: 127.0.0.1
control-interface: ::1
# port number for remote control operations.
control-port: 8953
# unbound server key file.
server-key-file: "/usr/local/etc/unbound/key/unbound_server.key"
# unbound server certificate file.
server-cert-file: "/usr/local/etc/unbound/key/unbound_server.pem"
# unbound-control key file.
control-key-file: "/usr/local/etc/unbound/key/unbound_control.key"
# unbound-control certificate file.
control-cert-file: "/usr/local/etc/unbound/key/unbound_control.pem"
# Stub zones.
# Create entries like below, to make all queries for 'example.com' and
# 'example.org' go to the given list of nameservers. list zero or more
# nameservers by hostname or by ipaddress. If you set stub-prime to yes,
# the list is treated as priming hints (default is no).
# stub-zone:
# name: "example.com"
# stub-addr: 192.0.2.68
# stub-prime: no
# stub-zone:
# name: "example.org"
# stub-host: ns.example.com.
# Forward zones
# Create entries like below, to make all queries for 'example.com' and
# 'example.org' go to the given list of servers. These servers have to handle
# recursion to other nameservers. List zero or more nameservers by hostname
# or by ipaddress. Use an entry with name "." to forward all queries.
# forward-zone:
# name: "example.com"
# forward-addr: 192.0.2.68
# forward-addr: [email protected] # forward to port 5355.
# forward-zone:
# name: "example.org"
# forward-host: fwd.example.com

Time to start the daemon:
echo 'unbound_enable="YES"' >> /etc/rc.conf

UPDATE 20140619 (thanks to Frederique Rijsdijk): also adjust unbound’s pid file path to reflect your configuration

echo 'unbound_pidfile="/usr/local/etc/unbound/run/unbound.pid"' >> /etc/rc.conf
/usr/local/etc/rc.d/unbound start

Verify that Unbound is listening:
netstat -anfinet|grep '.53'
tcp4 0 0 127.0.0.1.8953 *.* LISTEN
tcp4 0 0 *.53 *.* LISTEN
udp4 0 0 *.53 *.*

Try to query Unbound:
dig @localhost -t NS comv6.com

; <<>> DiG 9.8.1-P1 <<>> @localhost -t NS comv6.com
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER< ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 4

;; QUESTION SECTION:
;comv6.com. IN NS

;; ANSWER SECTION:
comv6.com. 13 IN NS ns1.comv6.com.
comv6.com. 13 IN NS ns2.comv6.com.

;; ADDITIONAL SECTION:
ns1.comv6.com. 13 IN A 176.34.99.156
ns2.comv6.com. 13 IN A 54.247.176.227
ns1.comv6.com. 13 IN AAAA 2001:470:200::2
ns2.comv6.com. 13 IN AAAA 2001:470:300::2

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon Apr 23 10:52:01 2012
;; MSG SIZE rcvd: 151

Look at the verified DNSSEC extensions in the logs:
tail -n29 /usr/local/etc/unbound/log/unbound.log

[1335171034] unbound[57517:0] info: 127.0.0.1 comv6.com. NS IN
[1335171034] unbound[57517:0] info: resolving comv6.com. NS IN
[1335171034] unbound[57517:0] info: response for comv6.com. NS IN
[1335171034] unbound[57517:0] info: reply from 192.12.94.30#53
[1335171034] unbound[57517:0] info: query response was REFERRAL
[1335171034] unbound[57517:0] info: error sending query to auth server 2001:470:300::2 port 53
[1335171034] unbound[57517:0] info: response for comv6.com. NS IN
[1335171034] unbound[57517:0] info: reply from 176.34.99.156#53
[1335171034] unbound[57517:0] info: query response was ANSWER
[1335171034] unbound[57517:0] info: resolving comv6.com. DS IN
[1335171034] unbound[57517:0] info: response for comv6.com. DS IN
[1335171034] unbound[57517:0] info: reply from 192.42.93.30#53
[1335171034] unbound[57517:0] info: query response was nodata ANSWER
[1335171034] unbound[57517:0] info: NSEC3s for the referral proved no DS.
[1335171034] unbound[57517:0] info: Verified that response is INSECURE
[1335171034] unbound[57517:0] info: resolving comv6.com.dlv.isc.org. DLV IN
[1335171034] unbound[57517:0] info: response for comv6.com.dlv.isc.org. DLV IN
[1335171034] unbound[57517:0] info: reply from 199.254.63.254#53
[1335171034] unbound[57517:0] info: query response was ANSWER
[1335171034] unbound[57517:0] info: validate(positive): sec_status_secure
[1335171034] unbound[57517:0] info: validation success comv6.com.dlv.isc.org. DLV IN
[1335171034] unbound[57517:0] info: resolving comv6.com. DNSKEY IN
[1335171034] unbound[57517:0] info: response for comv6.com. DNSKEY IN
[1335171034] unbound[57517:0] info: reply from 54.247.176.227#53
[1335171034] unbound[57517:0] info: query response was ANSWER
[1335171034] unbound[57517:0] info: validated DNSKEY comv6.com. DNSKEY IN
[1335171034] unbound[57517:0] info: validate(positive): sec_status_secure
[1335171034] unbound[57517:0] info: validation success comv6.com. NS IN

As you can notice, validation for domain name comv6.com succeded via dlv.isc.org.

What you have now is a fully working recursive, caching and DNSSEC validating Unbound DNS server.
This is just a quick guide to make you started configuring Unbound. You are warmly encouraged to read all the background documents and the manuals as well:

man 8 unbound
man 5 unbound.conf
man 8 unbound-control
man 8 unbound-anchor

How to configure Unbound with DNSSEC validation on FreeBSD 9.0 by Antonio Prado is licensed under a Creative Commons Attribution-ShareAlike 4.0 International