Managing and using network connectivity on a unix system

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11 views

why cisco VPNC work on the second time each time and not on the first time

I use the vpnc ( cisco VPN that installed on linux red-hat 6.X ) and the vpnc.conf file look like this more /etc/vpnc.conf ## generated by pcf2vpnc IPSec ID Comvwde IPSec gateway 217.118.6.7 ...
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0answers
32 views

How to create a wireless-to-ethernet router?

I have a Debian machine, which I want to turn into a router. It will connect via wireless to a access-point, where it will get an IP. To its ethernet port, other machines will be connected. It will ...
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13 views

delay in IP route deletion

(Apologies if this is the wrong StackExchange for this question, but there does seem to be some confusion regarding appropriate targeting of IP networking questions) I am very much a network newbie, ...
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0answers
13 views

Connect OpenWrt router to home wifi AND open wifi

I've noticed I'm within comfortable wifi range of a nearby coffee shop's open connection. I have an OpenWRT router that I'm not using, and thought it might be handy to have this connected to my home ...
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0answers
21 views

How to measure network traffic (with pfSense/freeBSD)?

Is it possible to measure network traffic (per month, per WAN, per direction) with pfSense/freeBSD? There are following programs listed ...
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1answer
39 views

Strange ip command output

When I call ip addr show I get output with all interfaces and their IP addresses (look at eth7): 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback ...
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1answer
42 views

Service network restart same as ifup and ifdown?

Can service network restart take place of ifdown and ifup? I was managing my server the other day using SSH and I changed my internal IP from DHCP to static. After editing the config file I had to ...
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15 views

How can I log outgoing TCP traffic including the full path of URLs?

I use a program regularly on Linux that makes a TCP request when it starts up and updates a file with an access token before launching. I'd like to write a batch script that makes this request (using ...
2
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1answer
18 views

proper syntax to delete default route for a particular interface?

summary: me@client:~$ sudo route del default ppp0 SIOCDELRT: No such process me@client:~$ sudo route del default dev ppp0 SIOCDELRT: No such process me@client:~$ sudo route del -net default dev ppp0 ...
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1answer
23 views

Remove IP address from interface with VLANs

On Arch Linux, I have a single physical ethernet interface on 2 VLANs (3 and 7) with static IP addresses for the VLANs and a DHCP address for the 'main' ethernet interface. Is there a way for me to ...
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2answers
1k views

Is it possible to connect to TCP port 0?

Listening to TCP port 0 allocates me a free port number on the system. But what happens when I try to connect to TCP port 0? The obvious answer is: "It doesn't work": $ nc localhost 0 ...
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31 views

What preventing me from using the “wl” module after using “b43”?

If I restart my computer with the following in /etc/modprobe.d/blacklist.conf: blacklist b43 blacklist ssb blacklist wl Then I can either modprobe wl (broadcom STA, works well) or modprobe b43 ...
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1answer
16 views

Debian stuck in Endless DHCPNAK/OFFER loop unless I ask DHCP server to clear expired leases

have a Marvel Kirkwood device running Debian with 3.16 Kernel. On boot, the DHCPClient gets stuck in a loop and never picks up an ip unless I log onto the dhcp server and ask it to dump the expired ...
2
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0answers
32 views

debugging iptables when tunneling one VPN through another

I seek to tunnel one SSL VPN (F5, running on my debian laptop==client) through another (OpenVPN, running on a debian linode==server), but lose all client networking (including, e.g., ping) after the ...
0
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1answer
24 views

Network card seems to be active but config file is missing?

I have a CentOS 7 virtual machine with an internal network as well as 2 bridged connections, I am unable to find the config file for the third network card. Any ideas where it could be? or what the ...
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0answers
9 views

how to tell chrony to syncrhonize time with specific server periodically

In Windows, somewhere in settings, I can check "Synchronize with Internet time server" checkbox, add ip-address (say 10.20.30.40) and that's it. How can I do something similar with chrony? I've ...
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1answer
16 views

State of network loopback

Why the state of lo interface is reported as unknown with cat /sys/class/net/lo/operstate even though ifconfig says it's running?
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1answer
20 views

No FIOS Network After Zorin 9 Install on Wireless Desktop PC

A friend has a home Verizon FIOS network, connected thusly: Verizon wired/wireless Router > wireless ASUS Windows 7 Desktop PC > wireless HP Windows 8.1 Laptop > wireless HP All-in-One Printer. Note ...
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5 views

linuxdcpp crashes Internet

As soon as I start linuxdcpp and connect to an hub, I cannot connect to the Internet anywhere in my Network. But I can upload/download files in linuxdcpp. Any idea what the problem could be?
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1answer
13 views

difference between “ip link set” and “disconnect / reconnect” in the GUI?

I've got an Ubuntu 14.04 guest installed in virtualbox. Often when the host machine changes networks or is suspended and restarted, the guest VM loses network connectivity. I can reliably get it ...
5
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1answer
38 views

Unable to configure eth1 and eth2 properly on Ubuntu

I am completely new to network administration, and so am finding things a bit tough. I have a machine, whose 1 interface I have to set to the subnet 10.0.20.0/24, another to 10.1.0.0/24 and a third to ...
2
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1answer
30 views

Running command on server, but have the server read/write local files [duplicate]

Is it possible to have a remote machine run a command, but redirect all reads and writes to a local machine. Example: I have a bunch of scripts in folder 'project'. When 'make simulate' is run in ...
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2answers
42 views

which packages are required to use make?

I try to compile a package on a fresh debian wheezy inside a VM (32bit Kernel): cd /tmp/ wget https://github.com/freifunk-gluon/batman-adv-legacy/archive/master.zip rm -Rf batman-adv-legacy-master ...
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0answers
9 views

No DHCP OFFERS on several PCs in same network

I have different PCs and 2 of them don't get an IP-address (because they don't get a DHCP-offer) by the ISP, while the others do. I pluged them directly in my cable-modem, one after another. But when ...
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1answer
22 views

Debian server makes internet connection drop

I have setup a small home server / NAS running Debian 7. The server is connected directly to the router with a static IP set in the router's control panel. There are no port forwarding rules set for ...
0
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1answer
27 views

Kubuntu 14.10 Wireless DNS Issue

I'm quite new to using Kubuntu and have run into issues with the wireless connection on Kubuntu 14.10. The wireless connection says that it is connected, and I can ping IP addresses of other devices ...
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2answers
49 views

Where does Linux store Wifi passwords?

I am going to write a simple replacement for Ubunutu's NetworkManager. Is there any place where the Wifi network passwords would be stored in Linux? I know about ...
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0answers
13 views

Painfully slow LAN ftp/smb/ssh less than 5kib/s

I have (finally) gotten my home server up and running. After installing/trying dozens of GNU/Linux builds I have landed on Open Media Vault for my main server, Mint 17.1 on my Laptop and I have a ...
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0answers
29 views

Network scanner

Is there a program for Linux that scans networks like spice works for windows I have tried fing box. I what some thing that is gui but that DOES NOT automatically start at boot up. And be free with no ...
0
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2answers
25 views

Using network manager and wicd together in Ubuntu?

I'd like to use the first tool for establishing a 3G connection, but the other seems more apt for wifi. Running both together seems like a road to disaster. But how could it stop one completely and ...
1
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1answer
74 views

Connect Linux to two networks simultaneously

I want to connect to two networks simultaneously using the Ethernet and in-built WiFi or to two WiFi networks by installing an additional WiFi adapter. My requirement: I have two sets of devices ...
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0answers
31 views

No problem connected by filezilla, but cannot get list when connected by linux CLI client

I built FTP server by VSFTPD, on Raspberry pi, and Inside NAT. Surely set port-forwarding and, it perfectly functional when I connected by filezilla. But, I can't execute LIST(dir) when I connected ...
0
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1answer
25 views

Understanding network problem (syslog)

I am running a lubuntu 14.04 server and its always worked well, except for the last couple of days it keeps dropping off the LAN. I am using a couple of powerlink adapters to connect it up as WiFi was ...
2
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1answer
28 views

ping works but curl does not [closed]

I am trying to set up networking on my development server running Arch Linux, but something is amiss. I have enabled dhcpcd on all interfaces, and ping now works (including dns resolution), but ...
1
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1answer
34 views

Unable to set mac address to tap interface using systemd-networkd

I'm trying to migrate some tap interfaces setup from tunctl to systemd-networkd. I'm using systemd version 215-8. So I have this test.netdev file: [Match] [NetDev] Name=tap_test Kind=tap ...
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0answers
12 views

nbtscan shows error “Failed to bind: Address already in use”

I am trying to use nbtscan to get a list of PCs in my local network with their NetBIOS names. When using nbtscan with the option "-r", it shows this error: Failed to bind: Address already in use ...
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0answers
36 views

Automating PPP connection: adding the insertion in routing table of the new interface

I start my USB 3G Modem by: # wvdial And then I must do, in order to acquire internet access: # route add default ppp0 Note that ppp0 is, in this case, the newly created virtual network ...
3
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0answers
38 views

tc cbq doesn't work (no traffic limitation)

I've been trying to use cbq weight attributes after HTB failed to do so. I've tried using a command set I've found in an example just to verify it works (HTB works fluently) Here are the commands I ...
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0answers
33 views

What does `NO-CARRIER` and `DOWN` mean for a wireless interface?

I have a remote server and I log output of certain commands while the server cannot access the internet. It uses a wireless interface to connect to the internet. In a working state the output of ...
2
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0answers
34 views

Correctly populating wpa_supplicant.conf from iwlist scan results

I am wondering how I can tell that my wpa_supplicant.conf file is both sufficient and valid. When running iwlist scan outputs ESSID:"wifi" Protocol:IEEE 802.11bgn Mode:Master Frequency:2.412 GHz ...
2
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1answer
23 views

How to record network throughput per port for long period of time

I have come across vnstat recently, and am enjoying it's simplicity, low resource usage, and its ability to record network history long term. However, I am looking for a similar tool (for long term ...
0
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0answers
30 views

default route of br0 gets dev eth0 instead of dev br0

On my LinuxMint laptop, i have a recurring problem with my bridge br0. On each start up, the default route does not work. The routing table uses eth0 instead of br0 probably because of dhcp. i roam ...
1
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1answer
31 views

No Default Gateway route for bond0 / Slave eth* interface gets IP assigned

I have set up a 4-NIC bond on my Debian Wheezy box. After a fresh boot, the system has LAN access, but cannot resolve outside host names or access outside IPs. It seems that this is because the bond0 ...
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0answers
21 views

Interface doesn't come up in docker run

I'm starting a docker container with my own network configuration: [root@localhost ~]# docker run --net=none --lxc-conf="lxc.network.type=veth" --lxc-conf="lxc.network.ipv4=10.0.0.100/24" ...
0
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1answer
19 views

set network manager dns in ubuntu

I have Ubuntu 14.10. When I'm at work I can browse the internet without problems. Now that I'm at home, I can connect, but I'm not able to browse the web. Some informations: the output of ifconfig: ...
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0answers
18 views

What does the “first Ethernet card” mean in the BSD world?

https://www.freebsd.org/doc/handbook/network-routing.html The designation link#1 refers to the first Ethernet card in the machine. Question: what does the "first Ethernet card" mean? How to ...
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2answers
76 views

No longer able to reach the Internet on Kali Linux

I'm running Kali Linux on VirtualBox and trying to learn some of its basics. I know it's based on Debian but I come from Windows so I'm new to Linux and networking in general. My problem is that ...
0
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1answer
23 views

two NICs in the same subnet— need to set up routing

I have a tricky case: +---+ +----+ |D1 +->eth0---------<-eth0-+D2 | | | | | | +->eth1---------<-eth1-+ | +---+ ...
2
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4answers
201 views

Read the current IP address from the filesystem? [closed]

I'm writing a program that needs to know the system's current IPv4 address (received via DHCP), if it's connected and has one. For the sake of argument, the language is irrelevant and I must read from ...
0
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0answers
9 views

run netperf without IP address available

I have DPDK set up, with two NICs taken over by DPDK, i.e. the interfaces are not visible to userspace applications. Now, I need to run netperf/iperf to measure throughput performance of port-to-port ...