Managing and using network connectivity on a unix system

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Unix: How to Test Ip Address is resolved to name

Unix: How to Test ip Address is resolved to name. I need to check whether ip address can be resolved to name using DNS entry via shell script. Code: DNS_Lookup() { LOOKUP=$(nslookup $1) ...
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1answer
311 views

How to get switch MAC address if it's a layer2 one?

arp -a doesn't show it. How can I get the MAC of it then? (on ex.: from a Linux)
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2answers
176 views

How to attach my domain with bind in real www

How to attach my domain with bind in real wwwI install bind9, with apache. By God's very grace every thing went smooth. my dig, host, nslookup and ping provide this info: my system ip address: ...
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2answers
448 views

NetworkManager controls my wireless card, but it can't find any networks?

I have a Broadcom wireless chip which I've managed to wrestle into working with Debian GNU/Linux (I'm on Sid, if it matters). The interface is definitely there: 612 ± ip link 1: lo: ...
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1answer
363 views

Which book of those two should i read to study networking for Unix/Linux administrator? [closed]

I'm quite a beginner to networking, I want to get the information that i need as a Linux/Unix admin. I have two books in hand right now: TCP/IP Illustrated, Volume 1: The Protocols UNIX and ...
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1answer
194 views

Unable to access http service intranet

I'm not sure if this is the right place, if this is the case I will move the question with no problem. I'm setting up a web server for testing Wordpress. Everything works fine if I try to access the ...
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1answer
608 views

Tacacs over IPv6

I have migrated my Redhat Enterprise linux server 5.5 to IPv6 . Now I want to run tacacs+ for IPv6. When testing from my client, it returns "unable to connect to server for IPv6 address", but for IPv4 ...
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1answer
219 views

Read and parse XML input via TCP [closed]

I'm setting up something where I'll need to be able to setup a service that accepts input on a TCP port and then parses the XML provided and extracts the necessary data, then posts that to Google's ...
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1answer
54 views

Does IPTraf includes its own activity in the report?

Does IPTraf includes its own activity in the report? If it does how do I exclude it?
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1answer
101 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 ...
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1answer
115 views

What do I need to setup a linux box as a proxy to access the network?

At the minute I have all my machines connect directly to my isp-supplied broadband router. I want to make sure my machines are behaving correctly so I wish to test this by sniffing the traffic of ...
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2answers
42 views

can't update with this error messg

I got this message: not enough free disk space.... The upgrade needs a total of 31.8 M free space on disk '/boot'. Please free at least an additional 31.8 M of disk space on '/boot'. Empty ...
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1answer
110 views

Problem in connecting server to Internet

I just have setup a Linux server. But currently I am having problem in connecting to the outside world. I am not able to do wget,apt-get or ping. Here ar some relevant details: $ping google.com ...
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1answer
383 views

How to troubleshoot high kernel time (high network usage; high interrupts)

I've noticed that I have high kernel time when doing a lot of network traffic in Linux. I also noticed that 45% of my CPU is spent doing interrupts. How can I further troubleshoot this?
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1answer
147 views

Make application listen to hosts under a different gateway

Network Structure A typical college network. Different Hostels connected through LAN. All hosts in a hostel use the same gateway. I can directly communicate to hosts in other hostels using their ...
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1answer
139 views

Samba connection slowness after ip change

we have encountered with a problem when we chaged the samba server's ip address. There are so many OS varies from Windows,GNU/Linux, Solaris and IBM. The samba server is running on SOlaris. And all ...
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1answer
6k views

Use of /etc/sysconfig/network-scripts/ifcfg-eth* files

What's the use of /etc/sysconfig/network-scripts/ifcfg-eth* files ? In some cases ifconfig lists the interface eth0 but I don't find the corresponding ifcfg-eth0 file whereas in other instances if I ...
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2answers
686 views

Bandwidth, CPU & Memory stats returned in single line from terminal

I'm trying to create a simple monitoring system that will show a graph of sales that is linked entirely to data of bandwidth, CPU and Memory stats as they relate to sales. So if I sale 1 widget per 5 ...
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1answer
121 views

Is port knocking good for a last chance when everything is locked out via the Firewall?

Based on this question: "Safe mode" on Linux? - So there is a configured knockd on a server, and a wrong firewall command was given out, so everybody got locked out from the server via ...
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1answer
836 views

Why does sshd accept local network inbound connections and refuse external inbound connection?

When I try to connect to my server from the internet, I always get: debug2: ssh_connect: needpriv 0 debug1: connect to address XX.XX.XX.69 port 22: Connection refused ssh: connect to host XX.XX.XX.69 ...
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1answer
232 views

wlan is first brought to life when ethernet is plugged in

Endless timeouts... Request timed out. Request timed out. Request timed out. Request timed out. Request timed out. Reply from 192.168.1.11: bytes=32 time=105ms TTL=64 ...
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1answer
3k views

How to configure VirtualBox to route through tor?

How can I configure VirtualBox to route all network access of a guest OS through TOR? My host system is running Linux, and I've already set up TOR on it.
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1answer
1k views

Network Printing in Fedora

I´m having problems setting up network printing in Fedora 16. In the printer setup box it says FirewallD is not running and gives a list of protocols that need to be enabled. I cannot find a FirewallD ...
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1answer
3k 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 ...
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1answer
3k views

How to run tcptraceroute utility on UNIX machine?

How can I run the tcptraceroute utility on a UNIX machine? I want to run a TCP traceroute for port 80.
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1answer
427 views

NetworkManager on Fedora 15 can't find frequently used wireless network

NetworkManager has refused to find the wireless network I always connect to. It sees other wireless networks except the one which I need. In recent past occasions, I've had to delete the wireless ...
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1answer
2k views

How to set IP adress automatically in Arch Linux?

I am using latest Arch Linux. But whenever I start my PC, it sometimes gets an IP address but most of the time, it gives me stress. I am getting very confused, how can I make sure it is really setting ...
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1answer
2k views

How to do “netcat” relays properly so that I have more control?

How to use the netcat to have relays? Like following I tried but not working: cd /tmp mknod backpipe p nc -l -p 7007 0<backpipe | nc 192.168.1.101 9001 | tee backpipe I want to receive data on ...
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1answer
471 views

Private vlan concept (rfc 5517)

I'm learing vlan concept and came around private vlan rfc. I think that i understand the reason and implication of isolated domain, but i'm not sure that i understand the community domain. ...
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2answers
933 views

Understanding tcpdump output on a linux router

My router has an atm0 interface and a VLAN (atm0.1) interface, atm0.1 has the WAN IP address. When using tcpdump -i atm0, the packets captured are only outgoing packet (LAN to WAN). 05:34:19.504895 ...
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1answer
523 views

Ubuntu 10.10: Why does external dial-up modem randomly disconnect from internet?

Background: Dial-up is the only option for this computer Gave up on the internal modem last week; now using an external USB modem. I finally have the computer talking to the internet. HOWEVER, after ...
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1answer
562 views

can ping, can't connect by IP - resetting the network fixes it briefly, then it breaks again

I've got one server (CentOS 5), out of a half dozen, that the network flakes out on. When it's 'dead', I can still ping other servers by IP, but if I try to make any kind of connection also using an ...
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0answers
18 views

connecting to virtualbox ubuntu from osx extremly slow

I am running ubuntu 10.04.x as guest on virtualbox from osx x 10.10.x host It works (kind of), but after working a while with it and also after power sleep it can get almost unusable slow. It looks ...
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13 views

How to tune dhcp networks configuration?

I'm not sure how should I configure my guest VirtualBox networks. So far, I figured out how to override this configuration so that I can connect to machines on both networks. But I'm manually ...
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27 views

How to put user dns on the first place in network manager? [on hold]

After changing dns in network connections, dig and other programs still query the provider's name servers.
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1answer
19 views

dd wrt firmwire file prompt password while extracting

I am a newbie in using dd wrt firmware development. Last day i download a dd wrt firmware dd-wrt.v24-21676_NEWD-2_K2.6_mini-e900.bin for Linksys E 900 router. I need to extract this image for ...
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1answer
24 views

Compile network card driver on debian

I buy a new network card , D-Link DGE-528T. My OS is Debian(Jessie) kernel : 3.16.0-4-amd64 but it can't detect the new network card, so I must to compile driver by myself. follow README file. ...
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0answers
25 views

Wiereless Not Working in Macbook Pro Retina (2014) [on hold]

I am a new Linux user. I have had a problem with the detection of my wireless network adapter in Kali Linux for a while. I have posted in their forums but with no success, but as I have seen that this ...
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1answer
30 views

How to make virtual interface ping to a host in the network

I crated a virtual interface as indicated in this link. sudo modprobe dummy sudo ip link set name eth10 dev dummy0 sudo ifconfig eth10 up sudo ifconfig eth10 192.168.1.150 now if I want to make a ...
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0answers
14 views

Aix equivalent of tcp_retries2 linux parameter [closed]

Please help me with the Aix equivalent of tcp_retries2 paremater that is available in linux machines.
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14 views

Congestion Control algorithm performance testing in FreeBSD

I am working on implementation of a proposed modification of TCP Congestion Control algorithm that would allow to improve it (the CC) by adding a dynamic bandwidth estimation. I have been able (with ...
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0answers
19 views

Bridge interface - add default route

I used to connect my ubuntu 14.04 laptop on office network via eth0 and the route table gets updated with the office network gateway ip in auto mode. Now, i changed my /etc/network/interfaces ...
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0answers
16 views

How to add routes multiple times in routing table?

Need to add same route multiple times in the routing table, or is there a way to maintain references in the routing table entries ? (may be with different priorities etc.) Am working on a switch ...
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0answers
18 views

Which flags should I use for my “netstat” commands?

I would like to use two variants of the netstat command; one exclusively for IPv4 and the other exclusively for IPv6 traffic. In both cases I would only like to list the following information: ...
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0answers
27 views

Command to see my current ip if proxy is applied only for a certain website

It might not be a relevent question here on so, but I tried on http://networkengineering.stackexchange.com and there are less users. So, I am not a networking guy and I have the next situation: I ...
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1answer
26 views

Samba and usbmount: can't write on automounted device

This is my problem: I configured my RPi with Debian: Samba shares /media/, that is readable-writeable-executable from my home network usbmount automount USB devices when inserted in my RPi, in ...
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1answer
14 views

What happens to TCP when a write fails to enqueue with the device tx ring?

Lets say the device tx ring is full and you do a normal C non blocking write(fd, buff) to enqueue data in the TCP SND buffer. What happens when this fails? In UDP - the packet would be dropped but ...
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12 views

IPvsadm, cannot get it to work at all

From my production server, I should make several connections (>50) to two different IP addresses. I am trying to load balance among these two IP addresses when making outbound connections so that the ...
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0answers
26 views

URXVT network issues

So yeah. Whenever I maximize URXVT my friend's computer's League of Legends client, while in-game, latency goes up to around 3,000. Wireshark, ntop and tcpdump do not reveal any outgoing packets ...
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17 views

Snort alerts analysis (web interface)

I have a question about Snort (or maybe any other IDS/IPS, any working solutions would be ok). The goal is to set up some web interface providing a way to view the whole TCP stream packets of each ...