Managing and using network connectivity on a unix system

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How do daemons like apache or bind open ports below 1024?

I know that ports below 1024 are protected and can't be opened by a user without sufficient permission. However, I'm wondering how daemons such as bind or apache can do so, though they aren't running ...
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3answers
35 views

What is the preferred way of using low port numbers in linux?

Long story short: I want Glassfish to listen to port 80 so that you don't have to specify port when typing in the url, but linux doesn't permit using low port numbers without root and running ...
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10 views

isc-dhcp-relay service doesn't work

192.168.2.1(dhcp server) -> (eth1 192.168.2.3)[dhcp ubuntu server 14.04 relay server](eth0 192.168.1.1) -> Client isc-dhcp-relay successful installed, configuration file is ...
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17 views

Specifically what advantages does Kali Linux have other than preinstalled packages? [on hold]

I have been using Kali Linux increasingly over the last few months. I also have an Ubuntu system, and have found that there are many similar tutorials on how to install Kali tools on Ubuntu. However, ...
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10 views

Routing ALL traffic through VPS

I recently acquired a Raspberry Pi and I'm setting it up for various things. I have a local router that the Pi is wired into along with my desktop computer. I want to be able to access the Pi from ...
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0answers
22 views

VirtualBox Bridged Networking is not working (NAT and Host-Only works)

I'll try to be brief and include all the things I've tried out so far: Guest OS: Debian Wheezy Host OS: Windows 7 Setting networking to NAT works. Setting networking to host-only works as well. ...
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13 views

packet transmission across two virtual machines in different subnet [on hold]

I am working on networking project. Here is the scenario, I have deployed two virtual machines on kvm in CentOS. These two virtual machines are in different subnet. I want to make communication ...
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1answer
16 views

How to change configuration of eth0 without restarting other interface (CentOS, Redhat)

I need to setup a static IP for eth0, my server has multiple network interfaces and I don't want to bring any of them, except for eth0 down. I found lot of guides like ...
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0answers
30 views

monitor mode capturing wifi

I have a network, which has 2 nodes (a phone, a MacBook) both are connected to same wireless network, I know the SSID and password for the wireless network password: mypassword ssid: myssid security: ...
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1answer
25 views

How does Linux prevent applications from sending more packets than the link can handle without dropping packets?

I couldn't make the question any clearer so here's an example scenario: Given a Linux machine connected to an IP network through a physical interface of bandwidth 10Mbps (or a higher speed interface ...
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31 views

Why must a server know its own host-name and domain-name?

In Linux, a server can set its own host-name and domain-name through sethostname() and setdomainname(). I just wonder, however, why must a server know its own host-name and domain-name? To my ...
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14 views

Network tool to monitor IP packet fragmentation

Is there a tool, similar to iptraf, that would let me see how many incoming/outgoing IP packets get fragmented/defragmented, and what percent of traffic they are? I know this can be counted with the ...
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0answers
15 views

Unable To Bridge Two Teamed Interfaces - Advice?

Before the wall of code I'll explain the situation. I'm trying to set up two interfaces to be teamed together, and from that team create a bridge. I've been studying for the RHCE and I believe this ...
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0answers
26 views

IP packets fragment randomly

I've observed the strangest thing - the same packet, same size, send through the same interface sometimes gets send whole, and sometimes gets fragmented, as if it exceeded the interface MTU... 1472 ...
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1answer
44 views

Which ip alias is currently active? [on hold]

I used IP aliasing technique to assign multiple IP addresses on a single NIC. I am using these IPs in a Python script to generate traffic. I am doing this for my college project. How can I determine, ...
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1answer
49 views

forward packets from one interface to another interface using iptables

I have an embeded system with 2 interfaces e0 and m0, whose ips are 10.0.0.20 and 192.168.0.20, respectively. Incoming packets into e0 have an ip of 10.0.0.10 and should be forwarded to m0 interface ...
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1answer
6 views

Virtual eth-adapter in networking-configuration

I have on my Debian en eth0-interface and I need the interface to listen to other IP's. I know I can create it with the following command ifconfig eth0:1 10.10.10.20/24 With this command everything ...
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1answer
22 views

Is Super server (inted / xinetd/… ) comes with Ubuntu default?

Few days back I learn about super server in networking. Then I looked for /etc/inetd.conf and /etc/xinetd.d and found neither of them in Ubuntu. Note: I know only these two types of super server ...
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1answer
23 views

Historical bandwidth data in a console? (save/load statistics)

So, I found that nload and iftop displays the amount of data that passed and how fast. Now, is there anything like those that can save/load statistics? I want to measure the amount of data I download ...
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1answer
25 views

SIPp “hello world” message to Asterisk

How do I run diagnostics against Asterisk? Asterisk is running on tleilax; and doge is on the same network (My network topology isn't optimal). Specifically, I want to do something like: sipp ...
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1answer
23 views

asterisk network topology — KISS

is this the typical Asterisk topology??? On my home system, I have the Asterisk server, tleilax, and the client, doge, connecting into my router -- so that they're both on the same network. The IP ...
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1answer
36 views

yast routing problem — connect: Network is unreachable

---------------------------------------------------update----------------------- on doge the route works: thufir@doge:~$ thufir@doge:~$ route Kernel IP routing table Destination Gateway ...
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21 views

converting teaming to bonding

RHEL 7 contains bond2team tool but it doesn't contains opposite team2bond tool. I need to convert my teaming files to bonding (please don't ask why, this is for testing purposes). This is my teaming ...
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13 views

Manual network setting on Solaris 10

Am using Solaris 10 on Virtual Box. While installing I chose to assign IP manually. IP address: 192.168.1.46 Subnet: 255.255.255.0 Gateway: 192.168.1.1 Now when I ping my Solaris machine with other ...
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can I delete abstract socket path? [migrated]

I created a abstract socket. #define SOCKET_PATH @/tmp/xyz /*in server code of socket_server.c*/ int sockfd = -1; int len; struct sockaddr_un address; int result; sockfd = socket(AF_UNIX, ...
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1answer
22 views

CentOS 7 very slow boot up after changing NIC

I have created a VM in VMWare esxi. I then cloned the VM, the clone receiving a new NIC along with a new MAC address. I change the IPADDR, HWADDR, and BOOTPROTO values and reboot the cloned-VM. ...
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17 views

RHEL6.6 in which file you put the gateway configuration

In RHEL6.6 OS system, which file we've to put the gateway configuration? I tried GATEWAY=xxx.xxx.xxx.xxx in these files : /etc/sysconfig/network /etc/sysconfig/network-scripts/ifcfg-eth0 and I ...
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1answer
39 views

iptables - Redirect except list MAC Address

I'm using iptables on my router to redirect all web traffic to my page. But i don't know how to except my mac address list. I did command like this: iptables -t nat -A PREROUTING -m mac ! ...
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4answers
116 views

Find a server IP on LAN from a script

I am looking for a way to have a script on a client machine automatically find the servers IP on the same network. I have several media extender clients running ubuntu 14.04.1 and a server running ...
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41 views

What are bogus file nlink values?

I am using files from a SMB share on my Raspberry Pi, running Raspbian. Whenever I access those files, I get the following message in my syslog: CIFS VFS: bogus file nlink value 0 What does that ...
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1answer
44 views

Send Mouse commands to PC with Raspberry Pi over the network

Is it possible to have a Raspberry Pi connected to a CCTV recorder via USB and send mouse input commands over the network? The video feed from the CCTV recorder is displayed on a TV with in the ...
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10 views

OpenWrt and Cisco - trunking

Can anyone help with trunking configuration with OpenWrt. I want to connect router which works on OpenWrt and Cisco Router using trunking. Until now I did this, but unfortunatelly it did not work. ...
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1answer
32 views

Smallest packet sniffer for an embedded device?

Are there tiny packet sniffers out there? I'm looking for something that can be compiled for a embedded device with very limited space. I thought of tcpdump but a dynamically linked and stripped ...
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1answer
34 views

Firewall: why no route to host?

I've LAN with two nodes. One runs fedora and acts as a server, and has some default firewall configuration bundled. Second runs arch (but that shouldn't make any difference). On fedora system, I have ...
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2answers
46 views

(SOLVED) Have ip address and wifi connection on mint 17 but no internet connection? [closed]

I have an ip address but no server found on browsers. Could be related to having been in hibernate mode? Tried disconnecting, turning router off etc. - no good. Can anyone help with how I might go ...
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1answer
26 views

Write access on mounting a Windows network share

I installed cifs-utils, and can mount the remote drive using the command sudo mount.cifs //DRIVE ~/homedir/ -o user=user,pass=pass,sec=ntlmssp However, the user account cannot write to the mounted ...
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1answer
52 views

What's the difference between “errors:” “dropped:” “overruns:” and “frame:” fields in ifconfig RX packets output?

Can someone please elaborate on the difference between the various RX packets fields in ifconfig output? For example, let's say I run ifconfig and see the following: eth0 Link encap:Ethernet ...
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0answers
14 views

Automate a gratuitous ARP every x seconds

There may be another issue here, so any other questions or comments are welcome. I have a CentOS 6.6 VM running under VirtualBox. It is connected to a GNS3 topology using a UDPTunnel. Everything ...
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1answer
26 views

Unable to connect to internet from Centos VM

I am using VirtualBox 4.3, I have installed centos 6.3. I have two adpaters attached. 1) NAT 2) Host-Only I want to be able to setup a cluster of 3 machines which can talk to each other and also be ...
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1answer
19 views

When using the spoofed IP option with arping no replies are returned

Host IP: 10.0.0.21 Spoofed IP: 10.0.0.112 Live IP: 10.0.0.138 When I normally run arping like: arping -c 1 -I wlan0 10.0.0.138 I receive a reply. However when I spoof the IP using a machine on ...
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1answer
67 views

How to set up wifi hotspot with 802.11n mode?

I have two computers running Ubuntu 14.04 (ok, one is actually Mint 17.1, but that's based on Ubuntu 14.04), and I am looking to use one as a wi-fi hotspot for the other. Both computers have identical ...
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1answer
23 views

How can I configure the default transmission rate for 802.11 (“WiFi”) in Debian 7 GNU/Linux?

I need to lower the transmission rate of my IEEE 802.11g network interface controller to have acceptable packet loss ratio (< 0.5 %), otherwise it becomes very high (> 50 % is ...
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1answer
32 views

Redirect traffic to another machine

I have 3 machines - A, B and C. Can I redirect all Http/Https traffic originating from B and C through A such that the third-party views the the incoming request as sent from A rather than B or C?
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41 views

wget not working but apt-get does

Although this question relates to Raspbian running on my Raspberry Pi, it feels like it is a more general Linux query.... The Pi is sat on a network which includes a Microsoft TMG server. I have ...
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2answers
32 views

Can't browse Internet in Redhat 7

I installed RHEL 7 using server with GUI with no added option on my local virtualbox, but I cannot get Firefox connected to the Internet. I checked /etc/resolv.conf contains nameserver setting I ...
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1answer
31 views

Assigning static public IPs to Proxmox KVM guests

I'm currently using 5 public IPV4 addresses on a physical machine running Ubuntu Server, which I intend to replace with new hardware running Proxmox. I'll do a P2V of the current Ubuntu install into ...
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1answer
29 views

How to fix or bypass the DHCP handshake to get an IP address

My linux box can't seem to get a DHCPOFFER from my router. This is blocking me from getting internet access on the linux box. Here's the setup: I have two computers, a linux box called mocha and a ...
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0answers
13 views

wifi-menu leads to freezes in Arch

I have a Macbook Pro 5,1 that I recently installed Arch on. Today, I had problems with my wifi, so I reinstalled the broadcom drivers, and was able to get wifi-menu working, but this has led my ...
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1answer
30 views

Java Client Connection Refused by Linux Server

I have a Java server and client, which is a simple server that prints a message when the client communicates with it. It works perfectly fine when the client and server are on the same machine. When I ...
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0answers
23 views

ping on linux vs ping on mikrotik

I have ubuntu server 14.04, with two network cards (LAN and WAN). I made a masquerate for WAN card. I have internet access from a host within the Lan of router. I do a ping to 8.8.8.8 and try to ...