2
votes
1answer
60 views

Unable to access website hosted on virtual machine

I'm on a mac (osx 10.9.3) running CentOS7 in virtualbox. I would like to access the website hosted on the virtual machine. Browsing to the Guest IP returns webpage not available. I'm able to ping and ...
9
votes
2answers
489 views

( /etc/sysconfig/iptables ) “Manual customization of this file is not recommended.” Why?

Editing this file directly /etc/sysconfig/iptables can save me so much headaches so much time and so on... and yet on the very top of the file it says.. Manual customization of this file is not ...
0
votes
1answer
127 views

Iptables rule to allow only one port and block others

We have two apps running (on top of linux) and both communicates through port 42605. I wanted to quickly verify if this is the only port that's been used for communication between them. I tried below ...
1
vote
0answers
148 views

Corosync & Pacemaker IPTables Rules

When using Corosync with two rings via multi-cast addresses 226.94.1.1 (Port 5405) & 226.94.1.2 (Port 5406) what iptables rules are required to allow two nodes to communicate optimally without ...
2
votes
1answer
257 views

No internet even with iptables ACCEPT all

I was trying to setup the firewall settings, and probably did something wrong. I don't have internet now unless I stop iptables service I tried flushing,and accepting everything sudo iptables -F ...
0
votes
1answer
154 views

iptables - why the stun, turn ports are not working to allow end points to access the server?

I have this iptables where all working except tcp/udp port 3478 and 5349. $ cat /etc/sysconfig/iptables # Generated by iptables-save v1.4.7 on Thu Nov 21 10:21:41 2013 *filter :FORWARD ACCEPT [0:0] ...
1
vote
2answers
189 views

How does KVM set its own netfilter rules?

I've been poking around with KVM VM's on Centos 6.4 and after some hair pulling and copious amounts of trying to break my desk with my head due to not having an internet connection on my VM's, I found ...
1
vote
2answers
191 views

Open a port CentOS

I'm new in CentOS and I'm trying to create a little script in Python, something like: $ python -m SimpleHTTPServer If I try to access port 8000 in my web browser, I don't get access, however if I ...
1
vote
0answers
119 views

Firewall config prevents hibernate connecting to postgres in CentOS6.3

I have an operating environment in CentOS 6.3 that has tomcat7 and postgres9.2 installed. There is just one web application deployed in tomcat that tries to establish a connection from localhost to ...
2
votes
1answer
132 views

What are the pros and cons to editing iptables configuration file vs adding rules via the iptables command

I am working with a product on CentOS that occasionally needs to automatically add and remove rules from the iptables configuration. For example, during an update, we want to explicitly refuse ...
1
vote
1answer
239 views

how to investigate Firewall blocked outbound TCP

CentOS webserver with CSF (Config Server Firewall) running. Blocking all outbound / Inbound traffic except listed ports 80 81 22 21 etc. for web, mail & FTP services etc. I'm use to seeing heaps ...
5
votes
4answers
4k views

iptables rules not reloading on CentOS 6.x

I have one single ipset added to my iptables on a CentOS 6.x box and this rule is lost when the machine reboots. I've found this answer showing how to make a Ubuntu system reload the iptables rules ...
1
vote
2answers
2k views

iptables blocking from internet side on eth1?

How to use iptables to deal with two Ethernet ports? eth0 port for LAN use (192.168.1.50 Private IP). eth1 port is connected to the internet via cable modem (80.0.xxx.xxx public IP). ifconfig ...
1
vote
1answer
300 views

Firewall/routing rule in Centos for this setup

I have two ethernet interfaces, namely eth0 and eth1. I want to implement an advanced routing rule but I am totally new to firewall/routing rules in CentOS. Here is what I am trying to do: Both my ...
2
votes
1answer
717 views

Changing firewall settings after installation of CentOS via kickstart

I was trying to install CentOS 6.3 via Windows Deployment Server. And to automate the installation process I used kickstart file in which i provided various details required during installation.Then i ...
6
votes
3answers
7k views

What prevents a machine from responding to pings?

I have a CentOS release 5.4 linux box on Amazon EC2 that I'm trying to set up to be monitored via Nagios. The machine is in the same security group as the nagios server, but it seems to be ...
0
votes
1answer
2k views

IPtables string match

I'm trying to write iptables string match rule To block http://domain.com:8888 and https://domain.com:8888 when it matches the supplied string in the rule. And another rule to redirect the ports also ...
2
votes
1answer
625 views

Will the Firewall GUI in CentOS overwrite changes implemented by IPTABLES manual edits?

I would like to restrict access to the SSH port of a new CentOS 6.2 server to select IP addresses but the Firewall GUI utility seems to be an all-or-nothing scenario. Either the port is firewalled or ...
3
votes
3answers
3k views

Blocking outgoing connects with iptables

I have a (non production) machine where external supporters have shell-access (non-root). I want to prevent them from going further on into our network from that machine using iptables. The "normal" ...
3
votes
1answer
380 views

1000 iptables entries on CentOS?

I just got a new dedicated server with CentOS and I'm trying to debug some network problems. In doing so, I found over one thousand iptables entries. Is this the default on a CentOS system? Is there ...
-1
votes
1answer
1k views

How can I open port 21 on a Linux VM?

I need to open port 21 on a Linux (CentOS 5) virtual machine I have. I have tried several Google solutions, but none are working. I was wondering if someone could tell me how to do this. Below is ...