-1
votes
1answer
49 views

Unable to connect to localhost or local ip but can connect to other servers or websites

I have a server with nginx|bind|mysql installed, everything is working fine but I am unable to connect to localhost or any websites hosted on server. I tried pinging and wget and none of them work ...
0
votes
1answer
53 views

Configure IPv6 on FreeBSD webserver

Seems I just can't nail the right rc.conf configuration for IPv6 on my FreeBSD 10 VPS. I'd like to go completely IPv6 and tutorials/instructions i followed aren't really working for me somehow. It's ...
1
vote
2answers
37 views

Incoming tcp SYNs possibilities

This might be a general TCP question. Can I receive TCP SYN packet on an established connection OR a connection in TIME_WAIT state? Is is possible?
2
votes
2answers
72 views

how to configure firewall with “psad” utility to avoid port scan

I am trying to configure psad to stop port scanning and other attacks. Currently I have following rules set for my firewall which drops all incoming connection except port 22,80,443 and 3306. -A ...
0
votes
2answers
269 views

SSH connection timed out

Every time I try to ssh into my computer from my chromebook $ssh -vvv user@***.**.***.*** I get the following output OpenSSH_5.2p1, OpenSSL 1.0.1e 11 Feb 2013 debug1: Reading configuration data ...
-2
votes
2answers
57 views

How to block access to a local user to a local port?

How to block access to a local user to a local port? Example: user Elvis should not have access to the port 25600 on the same server.
3
votes
0answers
90 views

ISC DHCPD memory leak solutions and or workarounds

Background: I have recently been put in charge of finding the root of and/or fixing a memory leak with an ISC DHCPD (4.2.5-P1) installation on a Debian (Lenny) Unix server. I have been researching ...
0
votes
1answer
55 views

Optmize server access for LAN and WAN (Internet Access)

I am trying to optimize my server so that accessing the local network as well as the internet. The OS is Solaris 9 running on a SUN V210 Connecting outside takes a long time, with sometimes there is ...
-1
votes
2answers
140 views

how I can get the value of JAVA_HOME from my client

I have nagios client and server, how I can get the value of JAVA_HOME from my client? I have use to set shell command in script that is running from remote host: echo $JAVA_HOME and printenv | grep ...
0
votes
2answers
50 views

What signal is sent to running process after network fail?

I am trying to reproduce a situation where a process fails due to a network outage. I was hoping to reproduce this signal with a kill command. A normal kill command is not working. I have taken a look ...
0
votes
1answer
332 views

Puppet agent not starting?

I've attached the full output with debug to see if anyone can make sense of what is going wrong. I've tried removing /etc/puppet/ssl/ and the two nodes (agent and master) are able to ping each other ...
-1
votes
1answer
194 views

UnknownHostException in Unix while using InetAddress.getByName() [closed]

I use this snippet of Java code to lookup an IP Address from the domain name InetAddress address = InetAddress.getByName("google.com"); It works fine in Windows & Linux but throws ...
2
votes
2answers
2k views

Cannot ping over LAN until a ping is received

I have two OSX machines on a local subnet. Pings from Machine A to Machine B consistently timeout until Machine B pings Machine A. After B pings A, A can successfully ping B, but this success is ...
1
vote
1answer
62 views

Network connection on Linux

A general question about network connection on Linux : once a network connection goes into time_wait, is it still tied to the process ? Does it still use resources like say filehandle ? Reason I ask ...
1
vote
1answer
698 views

openbgpd: announcing our prefix

i use quagga as active for bgp4 but i am searching openbgpd. I installed openbgpd on freebsd. i am new at openbgpd. I have an AS and also my customer's AS. I have 2 IPSs for internet. how can i ...
0
votes
1answer
783 views

ifconfig shows Interrupt:21 Memory:f7fe0000-f8000000

Can some one tell me what does this mean: Interrupt:21 Memory:f7fe0000-f8000000 This is showing in output of ifconfig. The issue is i have a service (memcache) which is not responding on the ...
3
votes
2answers
2k views

syslog ip ranges to specific files using `rsyslog`

I have many Cisco / JunOS routers and switches that send logs to my Debian server, which uses rsyslogd. How can I configure rsyslogd to send these router / switch logs to a specific file, based on ...
-3
votes
2answers
292 views

Why is Windows often perceived to be more vulnerable to attack than other systems, such as Linux and Mac OS? [closed]

ok I need help on this question cause I am learning the computer, so I am try to understand the question.
1
vote
1answer
827 views

socat: Show incoming connections

I am slightly going mad. Even if I call socat like this: socat -vvvv tcp4-listen:9000 tcp4-listen:9001 it works perfectly, but doesn't inform me about incoming TCP connections! Is there an ...
1
vote
2answers
197 views

HAProxy configuration file

Where it is located? Sometimes I see it under /etc/haproxy.conf, other times at /etc/haproxy/haproxy.cfg. IF both reside, which one precedes then?
3
votes
5answers
4k views

Monitor network traffic volume over interface

Is there a way to monitor the traffic (e.g., get a live view of the utilization) over a particular network interface, say eth0? The catch here is that the set of tools on the box is fixed, and is ...
2
votes
2answers
1k views

Diagnosing possible intermittent network failures/slowdowns; tool?

Is there a simple (linux cli) tool that I can run continuously for a period of time to see if the there are any connection problems between two specific network endpoints over the wan? One remote ...
2
votes
3answers
360 views

How do I assign unique IP addresses to home directories in Linux?

On Linux and Apache, I am trying to figure out how I can assign unique IP addresses to user home directories? In case your curious, it is a dev server. And instead of the users looking up ...
0
votes
3answers
274 views

Nmap: what is the difference between “nmap <target>” and “nmap -sS <target>”?

This is an extremely basic question but also one I can't really seem to find an answer for, despite looking through the nmap documentation (man, online, and google). My question is, what is the ...
13
votes
4answers
3k views

What is the “slash” after the IP?

In Amazon EC2, where I set "security groups", It says: Source: 0.0.0.0/0 And then it gives an example of: 192.168.2.0/24 What is "/24"? I know what port and IP is.
1
vote
4answers
173 views

two servers cannot communicate

Two servers (unfortunately one web server one mysql server) were fine until last night. Now, i can't ping, ssh, or open any lines between the two servers. Any other machine can get to them just ...
2
votes
5answers
5k views

How do I know what processes are using the network?

Sometimes I can see heavy usage of network in my Gnome System Monitor. I wonder what process is downloading/uploading data. Is there any tool which can show me: what processes are using the Internet ...
0
votes
4answers
1k views

Solaris: Prevent reverse DNS lookups except by using /etc/hosts

When running commands like netstat or snoop,, I would like not to reverse lookup because there are cases when either the number converts to name which converts to different number or the number ...
1
vote
1answer
1k views

netstat on fresh install of Solaris 10 update 9

I am attempting to decipher the below output bash-3.00$ netstat -a UDP: IPv4 Local Address Remote Address State -------------------- -------------------- ---------- *.sunrpc ...
3
votes
1answer
915 views

Does Identity Management for Unix modify the AD schema?

We have a forest whose schema master is a 2008R2 DC (AD schema version if 47). I'd like to install Identity Management for Unix, but it's unclear to me whether or not this updates the AD schema. The ...
2
votes
6answers
2k views

Ifconfig Alias Address Assigned by DHCP

I would like to create several aliases to eth0, but have the addresses assigned by DHCP instead of being set to static IP's. Is this even possible? All the examples I've seen assign a static IP ...
2
votes
3answers
12k views

How to test if a remote host port is accessible or not in Unix

In Windows, I go to command line and 'telnet ' to check the port. How to do the same in Unix? It seems some people using 'tcpdump port ' commands. Is this monitoring the real time traffic? Thanks.
4
votes
2answers
468 views

Are serial-to-ethernet adapters interchangeable?

I need to get data from a serial device (a weather station) over our network where it'll be processed by a Unix host (using custom software). I was able to compile remserial which makes the remote ...
1
vote
2answers
486 views

Setting request-user on IPP printer in CUPS

I need to send a request to CUPS server with the specific request-user parameter - remote_user instead of local_user. How should I set the local CUPS server?
0
votes
4answers
460 views

Troubleshooting httpd in Linux

I have a small personal site hosted on Unix (using a common hosting account). My experience with Unix is limited (too bad). Recently I set up a httpd server running on port 8082 (not Apache - but an ...
1
vote
3answers
1k views

I am on Rackspace Cloud. What is Bandwidth Out and Bandwidth In?

Can someone give me very easy to understand examples? And how to calculate? Suppose someone views a page off of my web server. This page is 400kb. How much is the bandwidth in and out for me?
7
votes
5answers
405 views

I have about 20 servers…how do I manage the SSH keys and permissions of each?

I have database servers, web servers, SVN servers, etc. Often times I ssh among them...or they auto-ssh. How do I manage what server gets to log into which others?
0
votes
0answers
517 views

ssh on standard port 22: how risky?

I'm setting up a CentOS 5 machine that will be used by several coworkers. The only things it will be serving are ssh and Apache. I'm trying to assess the importance of running ssh on a nonstandard ...
0
votes
4answers
139 views

No longer have to enter a password to SSH into another server?

For some reason, I have a server that if ssh into another server...you don't need to enter the password. How is this done? Can someone give me step by step instructions please?
3
votes
3answers
247 views

My DNS works! But, what is the simplest way to add something to it?

This is my current DNS example.com.db zone file. I followed a tutorial. It works, because when I point to this DNS from another server via resolve.conf, it will actually forward me to the right IP ...
1
vote
5answers
336 views

Cannot start BIND9

I followed everything EXACTLY in this tutorial for setting up DNS. I set up everything on a blank server. However, starting BIND9 failed: rndc: connect failed: 127.0.0.1#953: connection refused I ...
-1
votes
3answers
2k views

What is my “network address” in linux?

I am trying to set up a DNS server (local). On a tutorial, it says this: # This is the zone definition for reverse DNS. replace 0.168.192 with your network address in reverse notation – e.g my ...
-1
votes
2answers
211 views

Is this have any affect on why my BIND9 is not working?

$/etc/init.d/bind9 restart Stopping domain name service...: bind9rndc: connect failed: 127.0.0.1#953: connection refused . Starting domain name service...: bind9. (By the way, this is a continuation ...
0
votes
1answer
162 views

If I set up a DNS server, will I need to buy a domain name from Godaddy?

Suppose I have a server in my network that would like to talk to the database server. How would it talk to the DNS, and then point to the database server?
0
votes
4answers
816 views

network slow on port 80 only

i'm trying to diagnose why our company's wifi network is running really slow. the network is wpa2 encrypted, and there hasn't been any other traffic accessing our network other than the 5 computers ...
1
vote
1answer
334 views

Change read order of hosts.allow and hosts.deny?

When deciding whether to allow or deny a connection, wrappers first checks each line of /etc/hosts.allow and then (if no match was found) checks each line of /etc/hosts.deny. Is there a way to ...
0
votes
2answers
391 views

EXCEPTed services in /etc/hosts.allow

Say /etc/hosts.allow contains this: ALL EXCEPT in.telnetd : foo.example.com Someone is telling me that if foo.example.com attempts to telnet into this system, the connection will be denied because ...
3
votes
6answers
2k views

Creating a UNIX-based VPN: pointers, guidelines and pitfalls?

Does someone have first hand experience with creating a UNIX-based Virtual Private Network? What are the best VPN clients / tools available for accomplishing this? Are there any common pitfalls that ...
7
votes
5answers
323 views

Failed line of communication… rebooting for morons?

I work at a large corporation where we use many legacy systems. To note some of the systems: HP-UX 10.20, Windows 2000, VMEBus systems, systems designed 30+ years ago that do not communicate via ...
3
votes
11answers
2k views

Which hardware for an entreprise router/firewall/content filter/proxy on a single server [closed]

I have to set up a "secure" network for my boss. For now, I have a ADSL router linked to a switch. All users are connected to this switch. Security is obviously bad. I want to put a server between the ...