1
vote
2answers
59 views

Is it bad to select remember me option in the browsers of a compromised machine?

I was reading an article on how to sniff network packets. (of course for knowledge purposes only). I came across these particular lines. For instance, say I was sniffing traffic on the network, ...
1
vote
2answers
112 views

ssh to remote server without password

I have a remote server. i planed to use public keys to connect over ssh without typing the password but the remote system rejects public key key authentication. So what is the best way to do it? What ...
0
votes
2answers
119 views

Unable to telnet public ip on port 80

We are facing a communication problem between the public and our private network. We have a Linux based web server behind a firewall and an internet router. As part of some integration, our web portal ...
1
vote
0answers
26 views

I'm wondering about CUPS security. What can I do?

I run Debian Wheezy on a old Acer Aspire One ZG5 model netbook as a server. I have a printer shared to all my other systems and I'm worried about security. On the server I have IPtables set up to ...
1
vote
1answer
40 views

How kernel allows a process to receive network data that do not belong to it? [closed]

Each process is assigned with port number when using network resource. A process can only send and receive network data from its assigned port number. How kernel allows security programs like IDS, ...
1
vote
1answer
137 views

Does an in-kernel firewall sit between the network access layer and Internet layer?

This question is a follow-up to my previous question. Logic for me to says that an in-kernel firewall sits between the network access layer and the Internet layer, because it needs to have access to ...
3
votes
1answer
81 views

How security programs like firewall, IPS and IDS have access to network data?

It is said that kernel responsible for the transport, internet and network access layers for a network data. Then, the network data is passed on the appropriate process based on port number. How ...
3
votes
1answer
56 views

Did this tutorial block pings to my server?

I am a programmer teaching myself linux admin stuff. I followed this tutorial to setup a firewall on a VPS. As a part of that tutorial, I block all traffic except for web traffic and SSH traffic. I ...
0
votes
2answers
41 views

Check that fail2ban is running?

I just installed and configured fail2ban. I want to make sure it is working. I don't want to block myself from the server so I can't just login (poorly) a bunch of times. How do I see that fail2ban is ...
0
votes
2answers
116 views

What is the default action for incoming packets that don't match explicit iptables rules?

CentOS 5.x I'd like to understand what is specifically happening to incoming packets that don't explicitly match rules in my iptables chains. Is the default action to reject them? Or drop them? ...
0
votes
1answer
264 views

iptables couldn't load target allow

I am using the command below to allow all traffic from hosts on my internal network but it says "iptables v1.4.18: Couldn't load target `ALLOW':No such file or directory". What is the problem here? ...
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] ...
4
votes
2answers
1k views

How to identify a process which has no pid?

I have a process which listen to 2 ports : 45136/tcp and 37208/udp (actually I assume it is the same process). But netstat doesn't return any pid : netstat -antlp | grep 45136 tcp 0 0 ...
4
votes
1answer
442 views

How can I secure my Ubuntu 13.04 to prevent network attacks? [closed]

Is there a way I could protect my pc computer from being hacked in an event where the internet conection will be opened? Thing is I am going to Campus Party Colombia 2013 and I was sugested to format ...
1
vote
2answers
4k views

OpenVPN - Socket bind failed on local address [AF_INET] IP:1194: Cannot assign requested address

How get it resolved? I am trying to start the openVPN server so that i can login remotely using username: demo and password: demo, but openVPN server is failing to start. What am i doing wrong, how ...
2
votes
2answers
783 views

wpa_passphrase must be 8..63 characters

I'd like to connect to wireless network via command line in Linux. When doing it I've stuck with this issue: $ wpa_passphrase NETWORK_SSID NETWORK_PASSWORD Passphrase must be 8..63 characters The ...
0
votes
1answer
77 views

Is there any tools which can be used to make ports available from any firewall network?

I have been testing my application which has TCP/UDP ports for peer to peer with the help of server signalling commands for making communication, that works when I have Public IP or Lan IP and not ...
3
votes
3answers
3k views

Check outgoing network traffic

In Ubuntu, how can I check what information is being sent through the network connection, what programs are doing it, and what sites is my computer connecting to? I am not paranoid about security, ...
1
vote
0answers
113 views

Deny/allow a user's access to a port dynamically

I have stumbled upon this little tech dilemma yesterday, and know that there is a solution to it (IRC BNC resellers have it implemented already). However, the exact details and implementation elude ...
2
votes
1answer
313 views

Running a local port scan and found open ports but, don't know what they're used for?

I wrote a very basic python script to port scan my system. I'm running linux-mint lisa: open_ports = [] for port in xrange(65536): conn = socket.socket(socket.AF_INET, socket.SOCK_STREAM) ...
1
vote
0answers
494 views

Using Metasploit with 3G USB modem

I have a computer with Linux BackTrack 5 as host and Windows XP as guest on virtual box. I am using Host-Only-Adapter to create virtual LAN and to share USB modem internet as well so that both host ...
5
votes
5answers
18k views

How can I monitor all outgoing requests/connections from my machine?

My machine is a server so I want to ignore connections being made to my server (e.g. when someone visits my website). I want to see only connections/requests being made by my server to other places. ...
0
votes
1answer
71 views

What to make of system scans reported by psad

My system logs show that psad detects scans like this every minute. psad: scan detected: 192.168.1.10 -> 192.168.1.1 udp: [53] udp pkts: 2 DL: 2 If the first address is mine, and the second ...
0
votes
1answer
155 views

How to use linux tools to verify a site's authenticity

When I go to certain websites where it's important for me to know that I'm connected securely, certain browsers will say that the site failed the authenticity check. Firefox won't say anything, but ...
1
vote
1answer
476 views

How to provide a “guest LAN” on one ethernet device

I have an always-on machine running Debian/Squeeze with a couple of ethernet ports (it's doing various serverish jobs, including DHCP) and a LAN on each. eth0 is on 192.168.7.* and has access to the ...
2
votes
2answers
143 views

need explainations on this network route

I'd like to get some insight as to how I can possibly access network devices that are on a different IP range (obviously not mine) compared to what is configured on my wifi router? setup home wifi ...
1
vote
0answers
181 views

Information about the 1630/master app

When I run $ sudo netstat -a --programs | grep LISTENING | grep 1630 I will get this output. Do you know what good are processes running under this app name? Why they I running on my system and if ...
1
vote
3answers
225 views

How can I identify processes that use network facilities, and can they be killed?

In the output of netstat -a | grep LISTEN there are usually a lot of processes. How (where) can I find out information about them, what is their purpose in the system and if I can kill them? Which ...
6
votes
1answer
817 views

Jailbreaking HDTV

I have a Vizio internet TV, the predecessor to this one with basically the same specs, not 3D though. I wanted to try and gain root access to the tv. Using nmap I leaned that the only port open is ...
11
votes
4answers
2k views

Why do we need a firewall if no programs are running on your ports?

When I try to telnet to a port on a server, and if there is no program listening on that port telnet dies with a "Unable to connect ... " error. I understand that. But, why do we need a firewall if ...
1
vote
1answer
551 views

rpc.statd and avahi-daemon listening on all networks?

Background: - I'm running a home Debian GNOME desktop connected to the internet through an ethernet cable to an ethernet router. - I have a printer connected directly to my PC with a USB cable. - My ...
17
votes
1answer
8k views

Why are the first 1024 ports restricted to the root user only?

This is more idle curiosity than anything else. A friend of mine asked me 'which port range is it that only root can use under Linux?' I told him 0-1024 were restricted. Then he asked my why it was so ...
9
votes
2answers
1k views

How do I hide/anonymise/defend a computer when on hostile networks?

I connect to a lot of open networks when I'm pootling around. I'm fairly careful to VPN home for anything important but that's not really my boggle. The laptop runs several services (nfs, dev http ...
3
votes
2answers
556 views

How to block outgoing connections from process/user on FreeBSD?

My server executes third party software which processes user submitted files. I want to block outgoing connections from my process. How can I do it in FreeBSD?
2
votes
4answers
2k views

Private VLAN's under Linux?

http://blog.ine.com/2008/07/14/private-vlans-revisited/ Has anyone tried private vlan's under Linux? Any experiences with them? My real question is does anybody have howtos regarding this?
2
votes
1answer
993 views

How do you derive the passphrase from hexadecimal wep key?

I have a hexadecimal WEP key in the setting of my router. When I try to connect, the system asks me for the WEP passphrase. How can I derive it from my hexadecimal? This is what I have: ...
10
votes
7answers
3k views

What are some common tools for intrusion detection?

Please give a brief description for each tool.