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Questions tagged [block]

135 questions
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2 answers

Does the bash usleep block? Or will it yield to other threads?

I understand there is a usleep command in bash. Is this a "busy" or "blocking" sleep? Or will this yield time to other processes?
Mechi Fendel
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2 answers

linux minimal block size

Question : I would like to know if one could create an empty partition with a very small block size, say 100 bytes, and get their experience on the long run. Are there any gotchas ? Context : I know many filesystems set the default block size to…
Larry
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1 answer

How to block magnet links using Squid WEB proxy

I have Squid filtering all my WEB traffic running on port 80, I managed to block all torrent links using this ACL acl mediapr urlpath_regex \.torrent$ but I am not able to block magnet links.
Kārlis Baumanis
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2 answers

How do I block visitors by varnish on centos, using nginx as backend?

I want to block visitors from some country, by country code, not by maintain a lot of ip ranges. I can do it using only nginx, but i've just configured varnish to frontend, and I have not found any solutions yet. I'm using centos 6.4 x64. Thanks for…
user193750
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votes
1 answer

Free firewall for Windows Server 2003

We have a Windows Server 2003 R2 Machine here at work that I need to ensure is accessible only from specific set of IP Addresses. The Server is on a LAN and I am aware that one of the possible solutions maybe limit access to the Server's VLAN.…
n00b_Admin
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1 answer

How to configure IP tables to only allow ports 25 and 80

Hello I want to allow only ports 25 and 80 and all other ports to be closed. I tried to configure my Ubuntu linux, but I dropped all the ports... sudo iptables -F sudo iptables -P OUTPUT ACCEPT sudo iptables -P FORWARD ACCEPT sudo iptables -P INPUT…
user1024036
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votes
1 answer

How to mask out wireless by blocking a neighboring WiFi Access Point

I surely hope this question is not a duplicate of another; I had difficulty finding a cut and dry solution for this on my own, so I thought I might have some luck sharing it with the Hive Mind of collective human consciousness that is the Stack. My…
Crates
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votes
1 answer

block outbound traffic on hosting server, get alert on attempt to outbound attempt

So i want to block all unwanted out-bound traffic , specially traffic from unwarranted allowed ports both TCP and UDP and also get a email alert if any script or app tries to contact outbound port. eg; if someone installs a IRC chat script, it…
Linux unmastered
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votes
1 answer

Hosts file to block a website

I have seen a blog saying that we can block some websites using our hosts file. I have tried the same (shown below), but failed. Entry added in host file as below: 127.0.0.1 www.google.com I tried clearing the cache and tried it with a new…
Vysakh
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votes
1 answer

iptables block access to port 53

I would like to block access to any DNS server (port 53) except for my own $DNS_IP1, $DNS_IP2. $DNS_IP1, $DNS_IP2 are not part of my IP range but are out IPs.
user2207891
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1 answer

Domain blocked by ISP

ISPs blocked my domain in one country. It redirects to an IP address that the ISP uses to block access to sites it blocks. (https://ispipaddress:8080/mydomain.com) The URL cannot be accessed directly, but it can be accessed when clicked from Google…
se7enhell
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votes
2 answers

Router's Parental Controls Really Block All Internet Traffics?

I am using Asus 4G-AC53U router. When I turn ON "Parental Controls" to block a client's Internet access, does the router really block ALL kinds of Internet traffics including system's service (such as OS update checking, license checking, etc.) ? Or…
RRN
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-5
votes
1 answer

MySQL : How to lock all write in all databases?

I need to block all writes (insert , update, delete) on all databases. How can I do that ? Put all database in Read Only for a period time.
AssoumaniSaïd
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votes
3 answers

Cell Tower IP Address Blocks

I am thinking of creating an app that only allows users connected via a cell tower. Are there IP ranges that are only used by cell towers? I realize that it may be a 'moving target', but does anyone know of a list of the current blocks (like black…
roberthuttinger
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2 answers

How to permanently and irrevocably block websites on Firefox?

With Internet Explorer it's simple: you go to the settings menu, add websites you want to block, just randomly enter a sequence of letters and numbers so you cannot ever know the password, and it's done. (You could uninstall and re-install Explorer,…
Jan-Bart
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