Networking :: Block Specific Websites - Preferred Method ?
May 19, 2010
I'm trying to block specific websites, preferably using a portion of the url.
For example, if blocking [url], [url] would also be blocked. This implies that simply blocking a single IP using iptables would not work well.
The names to block will be somewhat dynamic, so a list specification would be ideal.
In my case, the LAN has a mix of linux and ms machines, and they all use a linux gateway currently running dnsmasq.
I find suggestions from using /etc/hosts (might work with yp, but not ideal) on the gateway machine, through to using squid on the gateway machine.
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Jul 28, 2011
How to block unwanted sites.
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Apr 12, 2010
I want to block all websites except desired websites.
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Apr 30, 2011
Would like to know the best way (or the pros and cons of different ways) to set up Alsa. I did a search for information on how to setup alsa on my system. I found a lot of out-of-date information even on the alsa wiki. What I did finally locate was two different methods for setup, both seemed somewhat up-to-date. One method at the alsa wiki said to put part of the information in the modprobe directory in a conf file and set up certain aliases. Earlier suggestions for putting information in modprobe.conf or conf.modprobe appear to be outdated and a directory with separate files for each device and a conf extension to the files is currently used. The second method from a thread on the Debian forum said to use alsactl init, set sound levels the way you want and then use alsactl save and restore functionality. Older methods using alsaconf instead of alsactl init appear to be outdated as well. Not sure where to put the call to alsactl restore though. Didn't notice that in the documentation.In case it matters, I'm running Debian Stable and have a built-in sound card on the motherboard with AC97 compatibility. It's a Realtek ALC882.
Is there a preferred or better method for setting up alsa? Is there a good pointer to instructions that are not out-of-date somewhere? Would be very interested to hear how others set sound up on their machines. What do others recommend as best steps to do this?
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Jun 15, 2009
Which method of spam reporting do the moderators prefer?
Using the spam reporting thread? Using the "Report this post" button? Or both?
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Nov 30, 2010
What is the preferred utility for removing a significant quantity of packages from the alternate installer and adding a few, without going through the more full-featured, start to finish customizers?
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Oct 27, 2010
I Need to know how to block this applications using iptables or ROPE scriptable Method..?..
1.Web navigation
2.Electronic mail
3.FTP transfers
4.Video traffic (multicast video stream and unicast video stream)
5.VoIP service
6.Instant Message (MSN and yahoo messenger�etc)
7.Management service (TR-069 and SNMP)
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Oct 27, 2010
I Need to know how to block this applications using iptables or ROPE scriptable Method..?..
1.Web navigation
2.Electronic mail
3.FTP transfers
4.Video traffic (multicast video stream and unicast video stream)
5.VoIP service
6.Instant Message (MSN and yahoo messenger�etc)
7.Management service (TR-069 and SNMP)
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Mar 30, 2011
What is the preferred method for obtaining Harvard style referencing in a LaTeX document?
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Jul 9, 2011
Recently I discovered that we were accidentally running a POP server (port 110), when we only should have been running the encrypted version thereof (port 995). This wouldn't have been a problem if the port was blocked in the first place. I had wrongly assumed that any port NOT specifically listed in one's firewall rules (CentOS 5 with default iptables installation) would be blocked. I thought you had to add a rule to /etc/sysconfig/iptables in order to open up a port. Apparently this is NOT the case. So is it true that if I install some random software that starts listening on any number of ports that I have not specifically mentioned in /etc/sysconfig/iptables that it will not be blocked - it will work right away?
Anyway, I guess two questions:
1) What's a generic way to block a specific port? I use rules like this to "open" ports (although is this not needed if they're open anyway?)
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 995 -j ACCEPT
What's the analog of this kind of rule to *block* a port?
2) Is there a better way to configure iptables to block all ports that are not mentioned in its configuration? Is that dangerous? (will it block things that I don't want to block?)
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Oct 1, 2009
I'm trying to configure our mail server to block email from a specific sender reaching a specific recipient. In other words, if one of our employees is getting harassed by a 'stalker', how would one go about blocking, at the MTA (Sendmail) level, a specific sender email address from reaching a particular users inbox? We do not want to capture the email - simply block it before it consumes server resources.The Sendmail server (MTA) is a front end to our Exchange server so no user accounts exist on the Linux server. We simply use it as a SPAM and Virus scanner then forward clean email to the Exchange server.
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Oct 6, 2009
My name is hentry varghese.i want to know how to block all websites and then allow only one.fof example:"www.gmail.com".please give me the complete commands one by one to do that.
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Jul 1, 2010
here i would like to inform you that my company ask me to block facebook site at the work time it is: 08:00-12:30 and 14:00-17:30 in proxy server.i'm still confuse how to do!i need the details configuration in squid regarding how to block the sites
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Apr 8, 2010
I have got a small queston: I have got several websites and some time ago I decided to delete some of them. As a result there is no virtual hosts on my web server, but if I will go to my_old_website dot ru I will be redirected to one of my current web sites (or if I will paste an ip address in browser), I want to know, how to block this?My virtual host's looks like this now:
Code:
<VirtualHost *:80>
ServerAdmin my_mail
[code]...
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Jan 24, 2011
I'm live in a place where internet bandwidth costs an arm and a leg. I have been playing around with Clear-Os, and would like to know how to block windows update and certain websites.
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Nov 1, 2010
I have installed Dansguardian on my little brothers laptop (using Tinyproxy and Firehol too) and I have it mostly configured the way I like it. The only problem now is that I can't seem to block secure (https://www...) websites, and he knows a few proxies that use secure domains. I was wondering if anyone has been able to make Dansguardian block these websites or is it just not doable?
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May 30, 2011
I want to block a list websites from myself using a password that I don't know.I would randomly generate it or something.Everything revolves around sudo, though, so I don't know how.Long to short: how do I blacklist websites using a password other than my sudo password.
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May 22, 2011
i was tasked to setup a proxy server to block access to some websites. i'm using centOS 5 and Squid 7:2.6 STABLE21-6.e15...i appended the following and tested the configuration with the supposed server i am using and the it does seem to work but now i'm wondering how i can test it with a client computer..i have 2 LAN cards and i just connected the other to one PC (can a direct connection work or does it need to pass thru a switch or hub)...i just can't figure out how it should be... how do i configure the 2nd LAN card to use this computer as its proxy server?
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Jul 17, 2010
i have been looking up ways to block websites in linux but most all of the free ones only block the sites the software makers want to (or you can't block just the sites you enter without blocking the sites that it wants to)i need to know how to block only websites i enter with squid using webmin
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Mar 24, 2011
I have centos 5 installed. and i use a firefox 3.6 browser on it. the problem is that whenever i open some sites like facebook, or easyxdm.com, or some others, the screen just gets hung up and the os either restarts or remains hung up.
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Nov 23, 2010
Is there any way to find the time required for accessing a block
from disk?
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Feb 11, 2011
I've noticed in my Apache logs a lot of hits to a specific URL on my server. The thing is, the URL is invalid and returns a 404. Every hit has a different Agent ID (things like Windows NT 4 and IE 8, Mac OS and Safari, Windows 7 and Mozilla, etc) and usually a slightly different IP address. If you browse the URL with Chrome/Firefox, it gets reported as potential phishing activity - despite it only returning a 404 error.
I blocked a range of IPs with IPTables which worked for a while, but I can see the IP address has changed again (outside of the range I set) and is generating logs again.
Is it possible to automatically block any IP attempting to access this specific URL?
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Feb 5, 2011
how to block a specific MAC address
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Aug 24, 2010
In Iran there is a famous "access denied page" that redirects you to a strange page with a lot of HTML errors and lol, telling you RTFM about ridiculous Internet laws.I want to filter the contents of the page, because the page IP, URL, ... are all unknown.I don't know much about squid configuration scripts.I can read but cannot write
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Jun 10, 2010
prohibit execution of any program include shell command, only be profiled program could be executed, can apparmor do that?
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Jun 19, 2010
I run the openssh daemon on port 22 and have the proftp running on port 21. I would like to block SSH for a specific user.I use proftpd.I would like to prevent the SSH access for this user and leave the FTP working for this user specific.Into /etc/passwd, I tried to change the /bin/bash to /bin/false, but this blocks both SSH and FTP access for this account.
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Feb 13, 2010
I was taking a peek at the active connections shown by the Firestarter GUI and noticed the following (the source is my computer):
SourceDestinationPortServiceProgram
192.168.0.11266.235.133.4280HTTP
I closed all Internet related apps and the connection persisted. After a reboot it did not reconnect (yet).The IP address appears to belong to esomniture.com - some sort of web analytics company. How do I prevent my computer from connecting to these rascals. I have found a lot of documentation regarding stopping inbound connections to services on my computer but not the other way. I have various filtering addons installed in Firefox however, this connection seems to be at a lower level as no program is specified as being responsible for the connection.
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Jul 15, 2011
What I want to do is from a file having block like
<event>
8 3 0.2685416E-02
2 -1 0
21 -1 0
[code]...
The first line after the "<event>" is its process-id, so I would like to have at the end a summary of how many "event" block I have for each type, ie how many
6 1 0.2685416E-02
or how many
7 2 0.2685416E-02
etc etc
I do not know in advance how many different-kind of block I will have, so it has to be a bit smart to scan the file, and make an new "summary" info for each unique type I was using something like
awk '/<event>/,/</event>/{if ($3 -eq 0.2685416E-02 ) { print $1" "$2" "$3}}' file > out
and then
grep -c "$1" "$2" "$3" but with no success since my awk commands prints all lines of each block
Suppose, that in advance I do know the $3, ie the 0.2685416E-02 which is a kind of weight
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Apr 23, 2010
Consider a situation in which you want to display only specific lines of contents from a file or of a command's output. Yes, we have head and tail commands. But, how to view all the lines of a file except the last one or vise versa when we don't know the count of lines in advance?
Consider this output:
Code:
[root@localhost ~]# ps au | grep bash
root 6316 0.0 0.0 4672 1440 tty1 Ss+ Apr22 0:02 -bash
root 20847 0.2 0.0 4672 1432 pts/0 Ss Apr23 0:12 -bash
root 21167 0.0 0.0 3920 660 pts/0 S+ 01:00 0:00 grep bash
Here, I don't want the last line (in italic) to be included in the result since the last line is due to "grep bash" in the devised command "ps au | grep bash". Well, we can rewrite the devised command:
Quote:
"ps au | grep bash | head -n 2"
But, again, here we are specifying the count of lines to be included. But, in the presented problem we don't know any count in advance!
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Apr 29, 2010
Is there a way of allowing only certain domain to send e-mails to certain specific e-mail address. I am using Sendmail, and I have an alias which translate to certain members of staff within my organization. I don't expect e-mails from outside our domain to be sent to this alias e-mail address.
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