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Old 01-27-2009, 11:55 PM   #16
linuxlover.chaitanya
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That link will work for you. Dont worry. Just remove the unrecognized lines that you added. Those are for older versions and you seem to have a newer version. And just add the ip address range rather than subnet mask. It will allow every machine with that subnet to access net. Also you will need to define the port on which squid should listen. By default it is 3128 and do not comment out the line.
It will work. And if you still can not figure out why it is not working then the solution is to use the external interface as proxy as suggested in example but that is not a very good practice.
 
Old 01-28-2009, 07:19 AM   #17
GlennsPref
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Hi, I have my box set-up as a fw proxied gateway too.

A second machine connects to mine and accesses the www from there. Transparently.

I found these pages...

http://www.linuxhomenetworking.com/

very helpful.

See how you go, Glenn
 
Old 01-29-2009, 12:19 PM   #18
aarav2306
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Thanks, went through the link
Realised my port 110 is not open on squid
Could that be the reason for machines on LAN not being able to send/recieve mails
Will this get done by 3128 alone
 
Old 01-29-2009, 06:43 PM   #19
GlennsPref
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But here's what I use.

Hi, I don't know about the ports used.

do you want port 110 cached?

I think you might need to look at the fw port rules.

regards Glenn

See attached, squid.conf iptables script(atomic.firewall) and rc.local

Not all distribs follow the same rules as Mandriva when it comes to loading

apps/services at start-up.

My system is a bit hacked, I don't use standard mandriva services at boot.

Mandi, shorewall, or the iptables services.

I load my fw and proxy with /etc/rc.d/rc.local.

Hope this helps,

http://www.visolve.com/squid/squid30/contents.php

Last edited by GlennsPref; 01-29-2009 at 07:31 PM. Reason: attach files, squid.conf and Atomicmpc iptables script
 
Old 01-30-2009, 12:44 AM   #20
linuxlover.chaitanya
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No I do not think you need port 110 to be open. I do not have it at my place and mail clients still work. 110 is for the pop server. Clients will still use port 80.
 
Old 01-30-2009, 02:46 AM   #21
aarav2306
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hi,

Tried making squid transparent by adding modifying http_port 3128 to http_port 192.168.0.2:3128 transparent, but still not able to download mails on my LAN mail clients.

My Ubuntu box which connects directly to the Internet has squid2.7 stable3 version, no firewall, no mailserver and my LAN (consisting of 2Windows & 1Ubuntu) is able to browse, but not able to send/receive my mails which are being hosted by an external ISP

My squid.conf is as follows
Quote:
acl all src all
acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8
acl purge method PURGE
acl CONNECT method CONNECT
http_access allow manager localhost
http_access deny manager
http_access allow purge localhost
http_access deny purge
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access deny to_localhost
http_access allow localnet
http_access allow localhost
http_access allow all
http_reply_access allow all
icp_access allow localnet
icp_access allow all
http_port 192.168.0.2:3128 transparent
hierarchy_stoplist cgi-bin ?
access_log /var/log/squid/access.log squid
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
refresh_pattern . 0 20% 4320
acl apache rep_header Server ^Apache
broken_vary_encoding allow apache
extension_methods REPORT MERGE MKACTIVITY CHECKOUT
hosts_file /etc/hosts
coredump_dir /var/spool/squid
Pls help
 
Old 01-30-2009, 04:02 AM   #22
linuxlover.chaitanya
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Just adding the option "transparent" to http_port line will not make it transparent. You will need iptables rules to redirect all the traffic from local network coming at port 80 to port 3128.

You will need to do this

Code:
iptables -t nat -A PREROUTING -i $local_interface -p tcp --dport 80 -j REDIRECT --to-port 3128
$local_interface is the interface that is connected to your local network and has got the squid service running on. i.e the interface with the ip address that you mentioned in the configuration file.

Last edited by linuxlover.chaitanya; 01-30-2009 at 04:04 AM.
 
Old 01-30-2009, 04:44 AM   #23
GlennsPref
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Part of my network set-up

Make sure the address matches the ip address on your system.

I think the order of the lines in squid.conf is important,

as you can't open a lower gate if the upper gate is closed.

I tried to attach the files I mentioned above but I can't see them. So here they are...


/etc/squid/squid.conf
Code:
http_port 192.168.0.2:3128 transparent
hierarchy_stoplist cgi-bin ?
acl QUERY urlpath_regex cgi-bin \?
cache_replacement_policy heap LFUDA
no_cache deny QUERY
cache_dir diskd /var/spool/squid 512 16 256
cache_store_log /var/log/squid/store.log
maximum_object_size_in_memory 8192 KB
maximum_object_size 51200 KB
auth_param basic children 5
auth_param basic realm Squid proxy-caching web server
auth_param basic credentialsttl 2 hours
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern .               0       20%     4320
half_closed_clients off
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl to_localhost dst 127.0.0.0/8
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl SSL_ports port 443 563
acl SSL_ports port 873
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 CONNECT webmin_port local_host
http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access deny to_localhost
http_access allow localnet
http_access allow localhost
http_reply_access allow all
icp_access allow all
visible_hostname GamesBox.GlennsPref.net
append_domain .GlennsPref.net
err_html_text squid@GamesBox.GlennsPref.net
deny_info ERR_CUSTOM_ACCESS_DENIED all
memory_pools off
coredump_dir /var/spool/squid
ie_refresh on

/etc/init.d/atomic.firewall.sh
Code:
#!/bin/sh
#
# Atomic IPTables firewall script v1.2
#
# Simple but effective firewall written for
# the Atomic Uber Linux box guide,
# Issue 21, Oct 2002
#
# Updated May 2003 for bandwidth shaping
#
# Ashton Mills
# amills@iinet.com.au

# Environment variables, change these values accordingly

	EXT_IF=ppp0
	INT_IF=eth0
	INT_NET=192.168.0.0/24

	ANY=0.0.0.0/0

	IPTABLES=/sbin/iptables
	MODPROBE=/sbin/modprobe

#
## You shouldn't need to touch anything below here
#

# Load appropriate iptables modules, others will be loaded dynamically on demand

	$MODPROBE ip_tables
	$MODPROBE iptable_filter
	$MODPROBE ip_nat_ftp
	$MODPROBE ip_conntrack
	$MODPROBE ip_conntrack_ftp

# Set proc values for TCP/IP. In order:
#
# Disable IP spoofing attacks
# Ignore broadcast pings
# Block source routing
# Kill redirects
# Set acceptable local port range
# Allow dynamic IP addresses
# Enable forwarding (gateway)

	echo "2" > /proc/sys/net/ipv4/conf/all/rp_filter
	echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
	echo "0" > /proc/sys/net/ipv4/conf/all/accept_source_route
	echo "0" > /proc/sys/net/ipv4/conf/all/accept_redirects
	echo "32768 61000" > /proc/sys/net/ipv4/ip_local_port_range
	echo "1" > /proc/sys/net/ipv4/ip_dynaddr
	echo "1" > /proc/sys/net/ipv4/ip_forward

# Flush everything

	$IPTABLES -F INPUT
	$IPTABLES -F OUTPUT
	$IPTABLES -F FORWARD
	$IPTABLES -t nat -F
	$IPTABLES -t mangle -F

#
## --- DEFAULT POLICY --- ##
#

	# Drop everything on INPUT and FORWARD chains, accept OUTPUT

	$IPTABLES -P INPUT DROP
	$IPTABLES -P FORWARD DROP
	$IPTABLES -P OUTPUT ACCEPT

#
## --- INPUT CHAIN --- ##
#

	# Allow Telstra hearbeat -- BPA users uncomment this

#	$IPTABLES -A INPUT -p udp --sport 5050 -j ACCEPT
#	$IPTABLES -A INPUT -p udp --sport 5051 -j ACCEPT

	# Allow local net browsing avahi/Zeroconf

	$IPTABLES -A INPUT -p udp --sport 5353 -j ACCEPT


	# Allow bootp port -- Optus and some ADSL users need this

#	$IPTABLES -A INPUT -p udp -d 255.255.255.255 --dport 68 -j ACCEPT


	# Allow access to services on this (the gateway) machine

	# SSH
	$IPTABLES -A INPUT -p tcp --dport 22 -j ACCEPT

	# Teamspeak
#	$IPTABLES -A INPUT -p udp --dport 8767 -j ACCEPT

	# Half Life server
#	$IPTABLES -A INPUT -p udp --dport 27015 -j ACCEPT
#	$IPTABLES -A INPUT -p udp --dport 27010 -j ACCEPT

	# FTP
	$IPTABLES -A INPUT -p tcp --dport 21 -j ACCEPT
	$IPTABLES -A INPUT -p tcp --dport 20 -j ACCEPT

	# Bittorrent
	$IPTABLES -A INPUT -p tcp --dport 6881:6969 -j ACCEPT
	$IPTABLES -A INPUT -p udp --dport 6881:6969 -j ACCEPT
	$IPTABLES -A INPUT -p udp --dport 4444 -j ACCEPT

	# Accept all connections on local and internal interfaces

	$IPTABLES -A INPUT -i lo -j ACCEPT
	$IPTABLES -A INPUT -i $INT_IF -j ACCEPT


	# Stateful inspection -- Allow packets in from connections already established

	$IPTABLES -A INPUT -i $EXT_IF -m state --state ESTABLISHED,RELATED -j ACCEPT


	# Drop packets from invalid sources (reserved networks and localhost)

	$IPTABLES -A INPUT -i $EXT_IF -s 10.0.0.0/8 -j DROP
	$IPTABLES -A INPUT -i $EXT_IF -s 172.16.0.0/12 -j DROP
	$IPTABLES -A INPUT -i $EXT_IF -s 192.168.0.0/16 -j DROP
	$IPTABLES -A INPUT -i $EXT_IF -s 169.254.0.0/16 -j DROP
	$IPTABLES -A INPUT -d 127.0.0.0/8 -j DROP


	# Don't log igmp, web or ssl. More noise we don't need to log.

	$IPTABLES -A INPUT -p igmp -j DROP
	$IPTABLES -A INPUT -p tcp --dport 80 -j DROP
	$IPTABLES -A INPUT -p tcp --dport 443 -j DROP


	# Log everything else

	$IPTABLES -A INPUT -i $EXT_IF -j LOG --log-prefix "|iptables -- "

#
## -- BANDWIDTH SHAPING  -- ##
#

#
# EGRESS (upstream)
#

	# TOS marked packets (we'll just work with minimise-delay and maximise-throughput)
	$IPTABLES -t mangle -A POSTROUTING -m tos --tos Minimize-Delay -j MARK --set-mark 10
	$IPTABLES -t mangle -A POSTROUTING -m tos --tos Maximize-Throughput -j MARK --set-mark 30

	# UDP (most games, including all Half Life mods as well as DNS, IM clients and more)
	$IPTABLES -t mangle -A POSTROUTING -p udp -j MARK --set-mark 10

	# Games that use DirectPlay from DirectX (note UDP traffic already matched above)
	$IPTABLES -t mangle -A POSTROUTING -p tcp --dport 47624 -j MARK --set-mark 10
	$IPTABLES -t mangle -A POSTROUTING -p tcp --dport 2300:2400 -j MARK --set-mark 10
	$IPTABLES -t mangle -A POSTROUTING -p tcp --dport 2300:2400 -j MARK --set-mark 10

	# Place other games here
	# EVE online
#	$IPTABLES -t mangle -A POSTROUTING -p tcp --dport 26000 -j MARK --set-mark 10

	# ICMP (ping)
	$IPTABLES -t mangle -A POSTROUTING -p icmp -j MARK --set-mark 10

	# SSH
	$IPTABLES -t mangle -A POSTROUTING -p tcp --dport 22 -j MARK --set-mark 10

	# Web, SSL
	$IPTABLES -t mangle -A POSTROUTING -p tcp --dport 80 -j MARK --set-mark 20
	$IPTABLES -t mangle -A POSTROUTING -p tcp --dport 443 -j MARK --set-mark 20

	# ACKs
	$IPTABLES -t mangle -A POSTROUTING -p tcp -m length --length :64 -j MARK --set-mark 20

	#
	# No need for catchall for class 30, handled by HTB root qdisc initilisation
	#

#
# INGRESS (downstream)
#

	# Only prioritise class 10 traffic

	# Don't police high priority UDP, game, ping and SSH packets
	$IPTABLES -t mangle -A PREROUTING -p udp -j MARK --set-mark 10
	$IPTABLES -t mangle -A PREROUTING -p tcp --sport 47624 -j MARK --set-mark 10
	$IPTABLES -t mangle -A PREROUTING -p tcp --sport 2300:2400 -j MARK --set-mark 10
	$IPTABLES -t mangle -A PREROUTING -p tcp --sport 2300:2400 -j MARK --set-mark 10
	$IPTABLES -t mangle -A PREROUTING -p icmp -j MARK --set-mark 10
	$IPTABLES -t mangle -A PREROUTING -p tcp --sport 22 -j MARK --set-mark 10

	# Place other games here
	# EVE online
#	$IPTABLES -t mangle -A PREROUTING -p tcp --sport 26000 -j MARK --set-mark 10

	# Catchall, police everything else
	$IPTABLES -t mangle -A PREROUTING -m mark --mark 0 -j MARK --set-mark 30

	#
	# NOTE: It's a good idea -not- to add HTTP to be let through the police filter even
	# for browsing as many P2P programs, not to mention your HTTP file downloads, will
	# flood the link unpoliced, causing delays with high priority (class 10) packets.
	# Shape HTTP going out, but let it be bulk coming in.
	#
	# Read the note at the end of the atomic.shaper script for more on INGRESS shaping.
	#

#
## --- FORWARD CHAIN --- ##
#

	# Stateful inspection -- Forward in connections already established

	$IPTABLES -A FORWARD -i $EXT_IF -o $INT_IF -s $ANY -d $INT_NET -m state	--state ESTABLISHED,RELATED -j ACCEPT

	#---------------------------------------------------------------
	# Allow outbound DNS queries from the FW and the replies too
	#
	# - Interface ppp0 is the internet interface
	#
	# Zone transfers use TCP and not UDP. Most home networks
	# / websites using a single DNS server won't require TCP statements
	#
	#---------------------------------------------------------------

	iptables -A OUTPUT -p udp -o ppp0 --dport 53 --sport 1024:65535 -j ACCEPT

	iptables -A INPUT -p udp -i ppp0 --sport 53 --dport 1024:65535 -j ACCEPT

	# Forwards for software running on Windows/Linux machines behind the firewall

	# Kazaa Lite (change destination IP accordingly)

#	$IPTABLES -t nat -A PREROUTING -i $EXT_IF -p tcp --dport 1214 -j DNAT --to-dest 192.168.0.2
#	$IPTABLES -A FORWARD -p tcp -i $EXT_IF --dport 1214 -d 192.168.0.2 -j ACCEPT

	# Bittorrent

	$IPTABLES -t nat -A PREROUTING -i $EXT_IF -p tcp --dport 6881:6969 -j DNAT --to-dest 192.168.0.2
	$IPTABLES -A FORWARD -p tcp -i $EXT_IF --dport 6881:6969 -d 192.168.0.2 -j ACCEPT

	$IPTABLES -t nat -A PREROUTING -i $EXT_IF -p udp --dport 6881:6969 -j DNAT --to-dest 192.168.0.2
	$IPTABLES -A FORWARD -p udp -i $EXT_IF --dport 6881:6969 -d 192.168.0.2 -j ACCEPT

	$IPTABLES -t nat -A PREROUTING -i $EXT_IF -p udp --dport 4444 -j DNAT --to-dest 192.168.0.2
	$IPTABLES -A FORWARD -p udp -i $EXT_IF --dport 4444 -d 192.168.0.2 -j ACCEPT

	# Forwards for hosting DirectPlay games

#	iptables -A FORWARD -i ppp0 -o eth0 -p tcp --dport 47624 -m state --state NEW,ESTABLISHED -j ACCEPT
#	iptables -t nat -A PREROUTING -i ppp0 -p tcp --dport 47624 -j DNAT --to-destination 192.168.0.2:47624
#	iptables -A FORWARD -i ppp0 -o eth0 -p tcp --dport 2300:2400 -m state --state NEW,ESTABLISHED -j ACCEPT
#	iptables -t nat -A PREROUTING -i ppp0 -p tcp --dport 2300:2400 -j DNAT --to-destination 192.168.0.2:2300-2400
#	iptables -A FORWARD -i ppp0 -o eth0 -p udp --dport 2300:2400 -m state --state NEW,ESTABLISHED -j ACCEPT
#	iptables -t nat -A PREROUTING -i ppp0 -p udp --dport 2300:2400 -j DNAT --to-destination 192.168.0.2:2300-2400


	# Forward out all traffic

	$IPTABLES -A FORWARD -i $INT_IF -d $ANY -j ACCEPT

#
## --- OUTPUT CHAIN --- ##
#

	# Follows policy

#
## --- NAT --- ##
#

	# Enable masquerade

	$IPTABLES -A POSTROUTING -t nat -o $EXT_IF -j MASQUERADE

#
## -- Transparent proxy to Squid --- ##
#

	$IPTABLES -t nat -A PREROUTING -i $INT_IF -p tcp --dport 80 -j REDIRECT --to-port 3128

/etc/rc.d/rc.local
Code:
#!/bin/sh
#
### BEGIN INIT INFO
# Provides: rc.local
# X-Mandriva-Compat-Mode
# Default-Start: 2 3 4 5
# Short-Description: Local initialization script
# Description: This script will be executed *after* all the other init scripts.
#              You can put your own initialization stuff in here if you don't
#              want to do the full Sys V style init stuff.
### END INIT INFO

touch /var/lock/subsys/local
/etc/init.d/atomic.firewall
ifup eth0
service squid start
eth0 is my internal connection, 192.168.0.2
ppp0 is my external connection to the www.

Some other network files that help, are found in /etc/sysconfig/...

My other pc uses the squid proxy transparently, no changes to that machines network settings is required.

This pc uses the proxy by changing the proxy settings in konqueror and firefox.

Hope you see the order I mentioned.

Regards, Glenn

Last edited by GlennsPref; 01-30-2009 at 06:07 PM. Reason: Spelling
 
Old 01-30-2009, 12:39 PM   #24
aarav2306
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hi
I tried using that command, didnt work. I think the problem is because the mail clients were not able to resolve the DNS while fetching/sending mails.I added the DNS server IP of my ISP provider in the Ubuntu box in my LAN in /etc/dhcp3/dhclient.conf as per https://help.ubuntu.com/community/In...nectionSharing and now it is able to send mails. However it is still not able to resolve the POP address while fetching mails. Also I am not sure how to add the DNS entries in the 2 Windows machines I have on LAN
Thanks
 
Old 01-31-2009, 12:56 AM   #25
linuxlover.chaitanya
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Very obviously you will need a functioning dns server. I have this problem as well that I still am not able to resolve. I have a functioning forwarding dns server, live dns by isp and still not able to resolve just one pop server. Rest is all ok. May your problem is not with squid but something else related to the dns server.
 
Old 02-03-2009, 01:04 PM   #26
aarav2306
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hi
My LAN is working now, am able to send & receive mails. Just followed the instructions in https://help.ubuntu.com/community/In...nectionSharing. I would like to thank this forum, it sure is a very friendly and active community !!!
One other thing, everytime I start my Ubuntu gateway and the Ubuntu in my LAN, I have to specify to manually key in the IP address 192.168.0.x. Any script I could modify so that this comes up automatically. Also do I have to manually run squid and NAT everytime.
Regards
 
Old 02-04-2009, 12:11 AM   #27
linuxlover.chaitanya
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Why not use rc.local to automate what ever you need to start at boot?
 
Old 02-04-2009, 07:27 AM   #28
aarav2306
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hi
I am not able to access all the computers from the Ubuntu m/c on LAN, it is able to access only 1 Windows LAN PC, not able to view shared folders on the Gateway either. How do I resolve this. The other computers are talking well with each other.
 
Old 02-04-2009, 08:00 AM   #29
linuxlover.chaitanya
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You could try Places > network
Go to Go tab > Location
in location bar type
smb://<ipaddress>/share
 
Old 02-05-2009, 05:53 AM   #30
aarav2306
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hi
says could not find "smb://192.168.0.2/share". I installed Ubuntu on another LAN PC. It too is able to access only the same Windows LAN PC. Rest Gateway Ubuntu, LAN Ubuntu and another Windows LAN PC arent visible when I go to Windows Network.
 
  


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