В статье "Setting Up Squid on FreeBSD" в типичном для статей daemonnews лаконичном и всеохватывающем стиле достаточно неплохо описываются тонкости установки и настройки proxy-сервера Squid под FreeBSD, упомянута даже технология ограничения трафика через delay-pools и органзация принудительного заворачивания (transparent) трафика в через прокси.[[END]]
<p><b>Кратко:</b><br>
<pre>
./configure --enable-delay-pools --enable-ipf-transparent
            --enable-storeio=diskd,ufs --enable-storeio=diskd,ufs
            --disable-ident-lookups --enable-snmp --enable-removal-policies

/usr/local/squid/etc/squid.conf:

# Need for transparent proxy
# You need to --enable-ipf-transparent
http_port 3128
httpd_accel_host virtual
httpd_accel_port 80
httpd_accel_with_proxy  on
httpd_accel_uses_host_header on

# Physical memory / 3
cache_mem 128 MB
# Max out Squid I/O perfomance, 15 GB cache and use Squid special diskd
        # but you need to recompile the kernel
# To use disk you need to --enable-storeio=diskd,ufs
# Reasonable values for Q1 and Q2 are 72 and 64, respectively.
# Q1 value must bigger Q2
cache_dir diskd /usr/local/squid/cache 15360 16 256 Q1=72 Q2=64

# You can use normal ufs instead
#cache_dir ufs /usr/local/squid/cache 15360 16 256

# I dont want to log anything
# The reason is to save some expensive I/O operation.
cache_access_log /dev/null
cache_store_log none
cache_log /dev/null

# Cache replacement policy
# The  heap GDSF policy optimizes object-hit rate by keeping  smaller popular
# objects in cache, so it has a better chance of getting a hit. It achieves  a
# lower byte hit rate than LFUDA, though, since it evicts larger (possibly popular)
# objects.
# The  heap LFUDA  ( Least  Frequently Used  with Dynamic  Aging )  policy keeps
# popular objects in cache  regardless of their size  and thus optimizes byte  hit
# rate at the  expense of hit  rate since one  large, popular object  will prevent
# many smaller, slightly less popular objects from being cached.
# You need to --enable-removal-policies
cache_replacement_policy GDSF

# Standard Access List
# I have two subnets, one for student and another one for admin
# Modify this according to your network
acl all src 0.0.0.0/0.0.0.0
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl outgoing src 192.168.10.2/255.255.255.255
acl student src 192.168.0.0/255.255.255.0
acl admin src 192.168.1.0/255.255.255.0
acl SSL_ports port 443 563
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443 563     # https, snews
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl CONNECT method CONNECT

http_access allow manager
http_access allow localhost
http_access allow outgoing
http_access allow student
http_access allow admin
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access deny all

icp_access allow localhost
icp_access allow student
icp_access allow admin
icp_access deny all

# Avoid caching cgi scripts
acl QUERY urlpath_regex cgi-bin
no_cache deny QUERY

acl magic_words1 url_regex -i 192.168
acl magic_words2 url_regex -i ftp .exe .mp3 .vqf .tar.gz .gz .rpm .zip .rar .avi
.mpeg .mpe .mpg .qt .ram .rm .iso .raw .wav .mov

# Delay Pool
# For delay pool, you need to --enable-delay-pools
delay_pools 2

# I have ADSL 2Mbits line
# 2 mbits == 256 kbytes per second
# 256 KB/s, 5 KB/s
# It means 256 KB/s bandwith for the whole network,
        # but 5 KB/s for each node, which is fair for everybody
delay_class 1 2
delay_parameters 1 256000/256000 5000/256000
delay_access 1 allow magic_words2
delay_access 1 allow student
delay_access 1 allow admin

# -1/-1 means that there are no limits for local traffic.
delay_class 2 2
delay_parameters 2 -1/-1 -1/-1
delay_access 2 allow magic_words1

# Cancel download if file is bigger than 1MB
reply_body_max_size 1024 KB

# snmp stuff
acl snmppublic snmp_community public
snmp_access allow snmppublic localhost
snmp_access deny all

# Change to your domain
# visible_hostname yourdomain.domain.com
# cache_mgr yourname@youremail.com

mkdir /usr/local/squid/cache
chown nobody:nogroup cache
/usr/local/squid/bin/squid -k parse
/usr/local/squid/bin/squid -z

/etc/rc.conf:
        ipfilter_enable="YES"
ipnat_enable="YES"
ipmon_enable="YES"
ipfs_enable="YES"

/etc/ipnat.rules
rdr rl0 0/0 port 80 -> 127.0.0.1 port 3128 tcp

Пересобираем ядро:
options         SYSVMSG
options         MSGMNB=8192     # max # of bytes in a queue
options         MSGMNI=40       # number of message queue identifiers
options         MSGSEG=512      # number of message segments per queue
options         MSGSSZ=64       # size of a message segment
options         MSGTQL=2048     # max messages in system
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URL: http://ezine.daemonnews.org/200209/squid.html
Новость: http://www.opennet.ru/opennews/art.shtml?num=1494