Tagged Questions

2
votes
1answer
93 views

iptables rules not realoading on CentOS 6.x

I have one single ipset addded to my iptables on a CentOS 6.x box and this rule is lost when the machine reboots. I have found this answer showing how to make a Ubuntu system reload the iptables ...
1
vote
2answers
333 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
182 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
506 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 ...
4
votes
2answers
2k 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
1k 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
510 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 ...
2
votes
3answers
828 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" ...
0
votes
0answers
287 views

Iptables rules conflict [closed]

I am using a CentOS 5 VPS. I am running sshd and pptpd on it. Both work fine ( having no firewall rules ), but I felt the need of a firewall. I'm not really into iptables and I think there's some sort ...
3
votes
1answer
336 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 ...