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0
votes
2answers
20 views

linux minimal block size [closed]

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 ...
-1
votes
1answer
44 views

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.
1
vote
2answers
200 views

Linux iptables drop traffic based on mac address

I'm doing some testing on my linux VM with one nic, I want to use it as some kind of a firewall which can block traffic of some clients based on a mac address. The client itself is having the VM as a ...
1
vote
1answer
59 views

Debian 7.2 (wheezy) - Block domain

0 down vote favorite A few days ago I figured out that someone was trying to get access to my mailserver, obviously to send spam emails through. After some research I found out that the sender uses ...
0
votes
1answer
51 views

Blocking an IP that is constantly accessing our website

Yesterday I noticed in our apache logs that there is someone constantly accessing our website, sometimes 5 times a second or so, and sometimes once in 5 seconds. However, it's happening 24 hours a ...
7
votes
1answer
159 views

Which block sizes for millions of small files

I have 2x 4TB Disks in hardware RAID1 (it might be a LSI MegaRaid) on Debian Wheezy. The physical block size is 4kB. I'm going to store 150-200 million of small files (between 3 and 10kB). I'm not ...
10
votes
1answer
169 views

how to do I/O sniffing

For sizing purposes I need to understand what requirements an application has to the I/O subsystem. I would love to do what I call I/O sniffing and obtain a list of events from the block layer like ...
0
votes
1answer
36 views

Linux block access to router login page

I am running virtual machines with Gnome desktops on Debian Squeeze and Wheezy. The virtual machines are on a different subnet than the host. I would like to block the virtual machines from ...
1
vote
1answer
167 views

iptables to block VPN-traffic if not through tun0

I have a dedicated Webserver running Debian 6 and some Apache, Tomcat, Asterisk and Mail-stuff. Now we needed to add VPN support for a special program. We installed OpenVPN and registered with a VPN ...
1
vote
1answer
222 views

DNSMasq wildcard top level domain/suffix

I'm running DD-WRT on my router and I need to block certain websites and all their potential suffixes, is that possible or would I have to list them all out individually? What I have is this ...
-1
votes
2answers
74 views

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 ...
1
vote
0answers
39 views

Partition block size different from device's and stacked LVM volumes ones

I have a pair of HP ML350 G6 servers with LSI MegaRAID 9266-4i+CacheVault driving Supermicro CSE836E16 enclosures via SAS bracket, filled with WD RE 3TB SATA drives. On these are configured a RAID10 ...
13
votes
2answers
288 views

Ethernet port plastic plug blocking port access on server

I have Dell Poweredge server with plastic blockers inside their ethernet ports. My problem is that I don't know how to take it out. You can see photo of the plug here: I tried to pull them out, or ...
-5
votes
1answer
136 views

iptables block access to port 53 [closed]

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.
1
vote
2answers
269 views

Is it possible to block a certain email adress from sending email anywhere other to its own domain?

I wonder if its possible to block all but few specific adresses to send outgoing emails anywhere other than its own domain. Also so they could still recive incomming messages. Blocking everyone isnt ...
0
votes
1answer
1k views

What Block Sizes and Stripe Sizes will cause performance issues using RAID5?

I'm trying to understand Block Size and Stripe Size. I realize this could apply to more configurations than just RAID5, but i am interested in RAID5 specifically, because I'd like to understand the ...
0
votes
6answers
140 views

how to block all traffic to my website and only allow me to visit the site [closed]

my website is new and there is tons of things i want to take care of before i open the website to public but i'm afraid of that maybe someone will visit the website using google like they searched ...
1
vote
1answer
51 views

Is it possible to block the addition of roles and features to Windows Server 2008 and 2012?

I apologize in advanced for anything that is no technically correct in the following. I am a beginner with server technology, and have only had about less than a month's experience with it. Is there ...
-2
votes
1answer
155 views

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

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 ...
3
votes
1answer
785 views

Choosing file system block size

Considering unix/linux/bsdunix specific file systems: How can I choose/know which block size to use while creating file system? Is there any specific block size value for a particular file system ...
8
votes
4answers
551 views

root full Linux. No free blocks

df -h reports the '/' partition to be 100% full. While running du -hs * on each directory of this partition shows there is still lot of space. tune2efs which reports just one block to be free. Ran ...
0
votes
0answers
171 views

How to block/filter responses based on content-disposition in IIS 7.5?

I host an application which has a reporting component based on Crystal Reports and I don't have the ability to modify the application or its settings. The reports are normally rendered as HTML but ...
1
vote
2answers
88 views

linux - centOS 6.2 block IP starts with

Is it possible to block an IP starting with? For example i want to block ALL IPs that starting with 188.67. Is there a command or a way for that? My problem: I have a game server, and A person ...
0
votes
1answer
238 views

how to disconnect users to MySQL but still allow admin login

Silly questions from a beginner: I wonder what is the best approach to : disconnect all users to MysQL but still allow console interactive connection, or admin connected from a MySQL Workbench? I ...
1
vote
1answer
2k views

How do I configure iptables in DD-WRT to block Skype on br1 only?

Using DD-WRT on a Linksys router, I've got a private network set up as br0 and a guest network set up as br1. I want to block access to Skype on only the guest network, and the easiest way I've seen ...
0
votes
1answer
245 views

Block HTTPS traffic to only selected sites

The Squid at my office is currently set up as a transparent proxy. I tried to block sites like facebook.com and twitter.com and was successful because just typing in those domains do not default to ...
1
vote
1answer
628 views

Postfix block senders outside from local domains

I would like to block every mail that is coming in from a domain that is running on my server. Example: I have domain1.com on my mail server and I'm getting a mail from outside with an email address ...
3
votes
1answer
310 views

iptables - drop all HTTP(S) traffic but from CloudFlare

I would like to allow only HTTP(S) traffic coming from CloudFlare. In that way attackers cannot attack the server directly. I know CloudFlare is not mainly a DDoS mitigator, but I would like to try ...
1
vote
1answer
40 views

Block IPs if they access a resource

I own a server that it's costantly being attacked by scripts (that try to access to phpMyAdmin's setup file's and stuff like this). I've heard that many people get this kinds of attacks, but I'm ...
8
votes
2answers
237 views

How do I prevent Apache from answering requests for domains I don't host?

Someone has pointed their domain (www.bomberball.net) to the same IP as my domain (www.kapparate.com) , and Google is now showing the former when searching for Kapparate, rather than the latter. ...
-1
votes
1answer
717 views

Free firewall for Windows Server 2003 [closed]

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 ...
1
vote
1answer
22 views

Block port with dual response

Theoretically, could I block a service running on port x by starting some other service on x with it? Would it return two responses or one big mixed response?
0
votes
1answer
207 views

Linux server blocking certain client without rule defined. How should I investigate?

One client is unable to access the CentOS server (can't ping or http). Checking the rules in APF 9.7 (apf -l) and there seems no specific rule defined. tracert shows each step and connection fine ...
1
vote
1answer
45 views

xfs incremental backup doesn't fit new disk

I have a 1TB xfs volumne on Amazon EBS, which contains 246GB of incremental backups, created with rsync and hardlinking. I want to copy this to a new, smaller disk. The problem is it doesn't seem to ...
1
vote
1answer
836 views

Squid domain block

i want lo block some porn domains, i tried this squid configuraztion: acl localnet src 10.0.0.0/8 acl loggedUser proxy_auth REQUIRED acl proxyUser external nt_group ProxyUser acl pornDomains ...
-2
votes
1answer
200 views

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. ...
-5
votes
3answers
199 views

Cell Tower IP Address Blocks [closed]

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 ...
4
votes
4answers
1k views

Blocking EXE from executing in XP Domain environment

I was wondering if anyone could point me in the right direction on how to block specific exe files from executing on XP machines in a domain environment. I have active directory setup and working so ...
2
votes
4answers
226 views

Reject all mail packages on all ports (outgoing) on Ubuntu

I just had a problem with our ISP; our internet connection was blocked because there was to much mail being send from our ip. The problem is that we all use gmail and that no mail is being send ...
0
votes
1answer
180 views

Remote to remote block level replication

I have to sync 2 iSCSI LUNs together at block-level (mandatory), asynchronous, only in the night, I found some tools to do it when Remote to Local or Local to Remote, but I cannot install anything on ...
0
votes
2answers
135 views

iptables -A INPUT -j DROP

I was dumb enough and just executed: iptables -A INPUT -j DROP This blocks everything of course :) Is there any hope for me to somehow still connect to the server? Thanks.
1
vote
2answers
2k views

Permanently blocking a domain in iptables

Suppose I want to block Facebook permanently. To do this, I have followed following processes: #host -t a www.facebook.com Sample output: www.facebook.com has address 69.171.224.40 Find ...
0
votes
4answers
319 views

IP Address blocking best way to do this (in terms of security)?

I have had a user trying to hack into my server and muieblackcat pops up on my server, quite a few times. I just wanted to get some advice as to the best way to protect against this ie should i ...
1
vote
1answer
262 views

How do I block google suggest through my firewall?

Im using cyberoam enterprise firewall. But I think this is a general question...I just want to know what port number or url I need to block to disable google suggest across the company.
1
vote
0answers
200 views

What does it imply if debugfs says Can't read next inode when doing inode scan?

I've got some bad sectors pending reallocation (based on smartmontools reports), and I'm trying to find out which file the sector is currently related to so that I can restore from a backup or such or ...
1
vote
2answers
167 views

Shared block device file system (cluster file system without networking)

Is there any file system that can be mounted multiple times and supports concurrent file access for Linux? Basically I want something like a cluster file system but without the need to have a running ...
-1
votes
1answer
146 views

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 ...
6
votes
3answers
6k views

EMC VNX iSCSI setup - unsure about SP/port assignment

We have a new VNX5300 waiting to get configured, and I need to plan out the network infrastructure before the EMC tech arrives. It has 4x1gbit iSCSI per SP (8 ports in total), and I'd like to get the ...
1
vote
1answer
609 views

How to block out an IP if there are too many incorrect passwords attempted via RDP? [duplicate]

Possible Duplicate: Ban, slowdown or stop massive login attempts to RDP There was an interesting thread about brute-force RDP attacks and one suggested solution that I liked was "set up so ...
0
votes
1answer
687 views

bind9: example.com works, www.example.com doesnt, and how to block urls

1) I was following a guide to setup bind again after I formatted to Ubuntu 10.04.2 LTS. http://doc.ubuntu.com/ubuntu/serverguide/C/dns-configuration.html#dns-primarymaster-configuration I can get my ...