Managing and using network connectivity on a unix system

learn more… | top users | synonyms (1)

2
votes
1answer
59 views

wlan0 device missing

I can't seem to get my wifi working and I feel i've exhausted google's search capabilities. Here is the output of lspci for the device 02:00.0 Network controller [0280]: Broadcom Corporation ...
0
votes
1answer
53 views

SSH from different countries with openvpn configured on pfsense and dd-wrt?

I have vpn set up in two different countries A (primary, where I live) and B (secondary, which I visit once or twice a year) and would like to SSH to my devices across the vpn. My Setup: Country ...
1
vote
0answers
52 views

IP packet forwarding in Debian

I have a physical network set up with machines A←–→B←–→C.  IP and Ethernet configurations are summarized as following: A(eth0: 10.10.10.2) ←—→ (eth0: 10.10.10.3)B(eth1: 192.168.0.3) ←—→ (eth1: ...
0
votes
1answer
77 views

How to block telnet using iptables command

I am trying to block telnet on my server but I have failed to do so. I have added following firewall rules in INPUT chain of filter table for the same. INPUT CHAIN(filter table): <some other ...
0
votes
0answers
20 views

Metasploit target reverse connection

well, I found many tutorials on how to open a meterpreter session on devices. But this devices must be on the same network of the computer from I launch the attack (because the lhost often looks like ...
2
votes
0answers
73 views

Binding nonlocal address on NetBSD

This is not a programming question, but a question about NetBSD. Linux, FreeBSD and OpenBSD have mutually exclusive but similar interfaces to allow binding the local end of a connection to an address ...
1
vote
1answer
64 views

routing table “220” in Linux kernel 3.2.0-23-generic

I have a Linux machine with kernel 3.2.0-23-generic and it has rule with priority 220 in RPDB which points to routing table named "220": T42:~# ip rule show 0: from all lookup local 220: ...
2
votes
1answer
83 views

routing cache in latest Linux kernels

As I understand, routing cache was removed since Linux kernel 3.6. In systems with older Linux kernel one could view the content of the routing cache with ip route show cache command and routing ...
0
votes
2answers
44 views

Bind doesn't resolve his authoritative zones

I'm currently setting a Bind 9 server on a CentOS 7 system, but I have some kind of unexpected behavior (even though it worked great in my VM). When I want to retrieve records from the zones it is ...
2
votes
0answers
163 views

Force IPv4 over IPv6 only for certain addresses

I'm currently running Debian 8 and I'm trying to force applications like Google Chrome to use IPv4 over IPv6 only for certain sites. My ISP natively offers IPv6 and it's amazing on all websites that ...
3
votes
2answers
65 views

What is stopping our UDP packets (how does it know the route is down)?

We have a server (camera) sending RTSP video packets via UDP. At a customer site it travels over several hops, one of which may be an unreliable WiFi link that drops the odd packet or five. Usually ...
0
votes
0answers
23 views

Network problem in Kali via bridge on VM

It's as simple as the title. I've installed Kali Linux and can't get ipv4 using bridge network on VM. Already tried all the popular solutions like changing NetworkManager.conf and restarting it. ...
1
vote
2answers
77 views

iptables configuration - ssh connection only from a remote network

I'm trying to configure Iptables of a server in order to permit SSH incoming connections only from a certain network. by the way this is the rule chain : # Drop anything we aren't explicitly ...
0
votes
1answer
45 views

Lab environment for testing routing in a Unix environment?

I know there are tools such as GNS3 and Packet Tracker; but the big problem with these tools is they do not work with open source tools such as OpenBGPD and BIRD. So, this leads me to the question; ...
0
votes
1answer
39 views

Modification needs to be done in iptables in case of a bridge between two interfaces is implemented

I have a machine with 2 NICs; eth0 and eth1. Each NIC has an assigned IP address and the traffic between them is controlled using the below script. #!/bin/bash SAT_RECV="192.168.200.0/16" NQ=9 ...
1
vote
0answers
51 views

Manual creation of NetworkManager connection file fails (Error: Unknown connection)

Objective: I am trying to set up a 3G connection using NetworkManager 0.9.4 via command line. I have previously succeeded (see this question) by setting up the connection through the nm-applet (GUI in ...
1
vote
1answer
88 views

Force a service to start before networking.service

I would like to start my service samplerbox.service [Unit] Description=Starts SamplerBox [Service] Type=simple ExecStart=/root/SamplerBox/samplerbox.sh # this script does: python ...
0
votes
0answers
79 views

nmcli connection activation failed

I was able to create a wifi hotspot on my debian 8 install using network tab under gnome settings. I was trying to do the same using nmcli but it always shows $nmcli con up id Hotspot Error: ...
0
votes
1answer
87 views

No IP address on VMware running centos 7

I just now installed Cent OS 7 on my VMware 8 and I am not able to connect it to a network. I checked the VM network and its mapped to the physical NIC. The same setting work like charm on my CentOS ...
1
vote
1answer
58 views

Blocking or forwarding packets as access point

I set up my Pi 2 as a wifi access point following this tutorial. I'd like to implement a rudimentary QoS, according to the DSCP field in every packet's header. That means, blocking packets using low ...
1
vote
3answers
97 views

Which program is altering my resolv.conf?

On Debian 8 stable, I add dns server IPs in /etc/resolv.conf but after some time they get overwritten. I don't have gnome installed (I use i3wm) and network-manager is not installed either. On ...
0
votes
2answers
24 views

Get the IP for NetBios name [duplicate]

There is a mashine called "BIE" visible in my network surrounding of my dolphin File manager (Ubuntu 14.10). I cannot access that device in dolphin and also don't get an answer pinging it. How can I ...
1
vote
0answers
17 views

Debian Network 2 subnets one interface proxmox

I have a box that runs proxmox with a debian 7 base. It is virtualizing openvz venet VMs. The host node and all VMs are currently inside of the same /24 . I recently got a new subnet and wanted to be ...
0
votes
0answers
61 views

Fedora 21 wired internet problem

Booted up Fedora on my desktop (previously was running w8.1, with also some network problems on restart/wake but usually a reset of the adapter solved them.) No internet on the Fedora. Here are the ...
5
votes
1answer
191 views

How can I redirect all UDP traffic from one port to another on BSD / OS X?

On Mac OS X 10.9.5 I am running boot2docker and would like to temporarily forward a non-privileged UDP port 69 to port 69 of the boot2docker virtual machine. Virtualbox only supports forwarding ...
1
vote
1answer
58 views

Static IP changes to dynamic automatically after time

I have found only one discussion about my problem here, but not a solution. I have access to one Debian 7.8.0 amd64 virtual machine (under VMware) and its IP address is gained through DHCP, e.g., ...
0
votes
0answers
75 views

WPA_Supplicant bgscan doesn't populate scan_results

I'm using WPA_Supplicant 2.1 with Wext driver, on a custom Linux 2.6.27 kernel. The issue is that bgscan fails to populate 'scan_results' other than the network that wpa_supplicant is currently ...
0
votes
0answers
109 views

Virtual Box Bridged network failed to get IP (DHCP) No DHCPOFFERS received

My goal is to get Bridged network working. When I try to UP interface in my Virtual Box VM, it tries some DHCPDISCOVER messages, but eventually I get No DHCPOFFERS received. I found where is the ...
4
votes
2answers
191 views

Linux does not reply to ARP request messages if requested IP address is associated with another (disabled) interface

I have a PC(kernel 3.2.0-23-generic) which has 192.168.1.2/24 configured to eth0 interface and also uses 192.168.1.1 and 192.168.1.2 addresses for tun0 interface: root@T42:~# ip addr show 1: lo: ...
-1
votes
1answer
55 views

Ping to LAN address takes an incredibly long time?

I'm running CentOS 7 in a lab environment with one domain controller (DC - Windows 2012R2) which serves as a DNS and DHCP server as well. CentOS is joined to the domain; it can ping the DC and a ...
1
vote
0answers
32 views

openbsd: mpls provider doesn't forward packets

Can anybody help me with next question: I am trying to get mpls test network up like in http://lteo.net/blog/2013/09/03/a-small-mpls-test-network-built-with-openbsd/ or ...
0
votes
1answer
54 views

Problems Setting Up DHCP Server On CentOS 6

I have been trying to set up a DHCP server on CentOS 6 running on an Intel NUC i7. I have installed dhcpd and am using the example dhcpd.conf subnet 192.168.1.0 netmask 255.255.255.0 { option ...
0
votes
0answers
28 views

Debian won't accept my network's password during installation

I'm trying to install Debian Jessie on a Toshiba Satellite M45-S331, but I'm stuck on the "Configure the network" step. I successfully installed the firmware for my wireless card, and I am able to ...
0
votes
0answers
29 views

Problematic RTL8188EE Wireless Network Adapter

Good Day All, There are numerous results when searching google on this issue, however, none seem to have a solution. I am hoping to resolve this issue -- or at least have a decent workaround. It is a ...
3
votes
0answers
14 views

Radiusd(freeradius): User only for a special client

Is it possible to restrict a user from the "users" file to a special client? I try to use one radiusd server for two wifi access points but I will use one user credentials only for one access point ...
3
votes
1answer
203 views

What exactly is an ifconfig dropped RX packet?

I'm seeing very high RX dropped packets in the output of ifconfig: Thousands of packets per second, an order of magnitude more than regular RX packets. wlan0 Link encap:Ethernet HWaddr ...
1
vote
0answers
32 views

docker container manual networking setup not working

I have an application environment where two containers need to talk to each other. container A gets a message from container B, and container A initiates a connection back to container B using the ...
2
votes
1answer
40 views

Make OpenVPN restart upon new network connection on systemd

How would you go about making OpenVPN automatically restart upon connecting to a network? The issue is that every time a network connection is lost, or if the computer is booted without a network ...
1
vote
1answer
33 views

Routing table and multiply hops

I have 6 networks, I need to connect network 1 and network 5 via five routers. What’s the command to set multiply hops? ip route add IP_address/mask via IP_adrress dev eth0, but how do I set next hop? ...
4
votes
1answer
39 views

Monitoring ARP Poisoning

How to monitor ARP poisoning? These few days my internal website that can be accessed locally has weird image replacing every images on the site for few seconds (it got back to normal after ...
2
votes
1answer
35 views

Office 365 online from Unix working only with MTU <= 1400

First of all --- I really didn't know where to post this question: askubuntu, unix, superuser... I am posting this one here because the only cases I have seen are on Ubuntu and I have a report for ...
1
vote
1answer
310 views

systemd waiting too long for network at Debian 8.0 Jessie's boot

My system has booted up relatively fast while run Debian 7 Wheezy, but after upgrade to Debian 8 Jessie, and therefore SysVinit to systemd, it became a way, way slower. The thing, slowing down the ...
2
votes
1answer
53 views

Change Network Bandwidth

I am using ethtool to change the bandwidth to 10MB/s. Since this is my first time using this program, I am struggling with the correct syntax to change it. I have tried something like: ethtool -s ...
1
vote
1answer
233 views

Connectivity issues after updating to Debian Jessie

I have inadvertently upgraded to Debian Jessie from Debian Wheezy while I was trying to install VLC player :D. The upgrade did not go very well as my sources.list file was mix of wheezy and ...
1
vote
1answer
62 views

How to block the response of certain DHCP server

There are multiple DHCP servers that run on our LAN, and some of them are unwanted. Can I configure my OS to reject certain responses so that I can get the correct one?
1
vote
1answer
28 views

Is it possible to have 2 different passwords saved for the same network?

I'm not always at home and sometimes the router needs to be reset completely to receive a new wan ip address because my roommates are not very tech savvy at all. When this happens the password is ...
3
votes
1answer
59 views

Prevent a lot of brute force attacks on Exim2

Some people or computers have been trying to log in a lot of times on my Linux DirectAdmin server over the last few days. I am receiving a lot of messages of brute force attacks for Exim2 in ...
1
vote
1answer
72 views

Where is routing table stored internally in the Linux kernel?

When I execute route -n, from where exactly (from which structs) is the information displayed retrieved? I tried executing strace route -n but I didn't help me finding the right place it's stored.
0
votes
1answer
281 views

Cannot mount Samba share: Unable to find suitable address

I just moved house, and after putting up all my devices, on my RasPi, running Raspbian, I cannot mount my TimeCapsule's SMB file shares anymore. It used to simply work, but Now I get this: ...
0
votes
0answers
37 views

CentOS 6 Include Gateway for Static IP Address

I've just set up a static IP Address for my CentOS Machine using the following settings in /etc/sysconfig/network-scripts/ifcfg-eth0 #eth0 Config #IPv4 DEVICE="eth0" NM_CONTROLLED="yes" ...