Managing and using network connectivity on a unix system

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35 views

Why are there so many loopback addresses?

From my understanding, all IP addresses of the form 127.x.y.z are loopback addresses. Now that seems to be quite a waste to me; indeed, already more than one address seems like a waste. Is there any ...
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2answers
1k views

SCTP support for Linux kernel 3.3.4-5.fc17.x86_64

I'm using Fedora 17 64-bit version, with Linux kernel version 3.3.4-5.fc17.x86_64. I installed lksctp using yum. sudo yum install lksctp-tools.x86_64 When I try to run sctp_status -H 127.0.0.1 ...
8
votes
1answer
110 views

Why my ethernet interface is called enp0s10 instead of eth0?

Just that, when I run ifconfig -a I only get lo and enp0s10 interfaces, not the classical eth0 What does enp0s10 means? Why is there no eth0?
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1answer
415 views

Enable kernel module for VPN

I'm trying to turn on modules for VPN so I followed this tutorial to compile new ubuntu kernel 3.8.6 . But the features I've turned on using make menuconfig seem not to be enabled. (the features I ...
1
vote
2answers
129 views

How can I ssh to a remote server with an automated password and no key?

I have a remote server. I planned to use public keys to connect over ssh without typing the password but the remote system rejects public key authentication. So what is the best way to do it? What ...
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0answers
7 views

home-built router - slow throughput

I am having slow performance with my home-built router. Compared to a stock Verizon (actiontec) router, it gets about 60 Mpbs down and 30 Mpbs up whereas I get about 15 Mbps and 20 Mbps up. I ...
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2answers
43 views

How to connect to an 802.1x wireless network via nmcli

I am able to connect to 802.1 networks via the nm-applet. I do not like doing this as I am running without a nm most of the time and I would hate to load up one just to connect to a wireless network. ...
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0answers
31 views

Fedora 20: Failed to start LSB: Bring up/down networking

I'm trying to restart my networking service in Fedora 20, and I get the following error: [dev@localhost das]$ sudo service network restart [sudo] password for dev: Restarting network (via ...
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1answer
255 views

udev Unable to Rename Network Device: Device or Resource Busy

I'm trying to use udev rules in order to give my network interfaces static, consistent names. However, it seems like there is some race condition happening preventing these rules from consistently ...
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0answers
31 views

is nameif deprecated? If so is there an equivalent replacement?

I read that the nameif is deprecated, although I still see it on my ubuntu 14.04 system. If this command is deprecated, is the command cited for removal or will it still be available? This command ...
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4answers
698 views

Clock skews on remote machines

I am performing some experiments on a network of about 10 remote Linux computers which are geographically scattered. I suspect some of them have clock skews but they are seen transiently (eg. once in ...
3
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1answer
25 views

Which network services depend on the “accept related input” iptables rule?

Background I am setting up a firewall for a webserver and was wondering if it would be a good security meassure to even reject RELATED input traffic and only except established connections by ...
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0answers
7 views

Linux - Mint, wifi aircard issue

I have a microsoft aircard (model 1051 notebook reviever2.0) that I use for wifi. Linux Mint doesn't auto detect wifi with it for some reason. How do I get this to work? Do I need a driver?
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2answers
3k views

D-Link DWM-156 HSPA USB Modem doesn't work with SIM card inserted

I have a D-Link DWM-156 HSPA modem, that I bought just a few days ago. The modem has drivers in its internal storage. There are Debian packages (.deb) for both i386 and amd64, so obviously I installed ...
1
vote
1answer
52 views

Debugging a Solaris network issue

I'm running a Solaris 11 x86 file server. The file-server part is ZFS + Samba. It's been up running for three or four years now without major problems. The Samba shares start out visible to other ...
2
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1answer
2k views

Firefox: use system proxy settings, but where are these?

Running Ubuntu 13.10, Firefox is configured to use the system proxy settings, but it seems it fails to pick them up. The computer is connected to the network, and it's possible to establish a ...
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3answers
36 views

Change IP address of a Virtual Machine running linux ubuntu on windows 8?

I currently have created two virtual machines in VirtualBox both running linux Ubuntu 14.04, and now want to have them have different IP addresses. (By default, they have the same IP address.) ...
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1answer
15 views

Re-routing request and response to server behind a VPN

My situation is as follows: I have a server (A) set up with a VPN connection to a third-party server (B). I have a collection of other servers (C, D, E...) that share the same private network as my ...
0
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1answer
34 views

What's the default server root path (CentOS7)

In /etc/httpd/conf/httpd.conf line 36 the ServerRoot is set. Mine is : ServerRoot /etc/httpd But this returns a syntax error when I try to start httpd service. Can anyone give me the default ...
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2answers
36 views

netstat shows an ESTABLISHED connection with no process

I am debugging some problems with postfix. When I establish a connection nothing happens and netstat shows: $ netstat -anp ... tcp 0 0 129.132.202.106:25 129.132.179.232:60154 ...
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votes
3answers
31 views

waiting for network in a bash script

I'm running a script that relies on network being up and a network share be mounted. The script runs on login (which happens automatically after boot). The problem is that by the time the script runs, ...
0
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2answers
47 views

Debian VLAN (8021q) Configuration doesn't work

I try to setup VLANs on a virtual Debian machine. It's connected to an Cisco 2960 Switch. The Switch has 3 VLANs (1,100,200) which're allowed the pass the trunk. The Switch Configurations was tested ...
5
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1answer
151 views

How to auto generate resolv.conf on Centos 6.5

I just installed CentOS 6.5 and configured the following files: /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 HWADDR=aa:bb:dd:dd:ee:ff TYPE=Ethernet UUID=adfddfaf-9sda-adse-dfs4-asdfsdfdfg97 ...
0
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1answer
316 views

hw csum failure

For the past 5 days, my Internet connection just drop randomly. After some researches, I found this into the syslog : Jun 25 17:01:59 home kernel: [127541.168744] eth1: hw csum failure. Jun 25 ...
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1answer
472 views

Command/scripts to check the Reverse DNS Lookup time

I am working on a project in which one master communicates with numbers of slaves. For that it has to make connection with hosts in network. But sometimes it hangs. I think that the reason behind is ...
3
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2answers
388 views

Set internet connection order or preference

I have SL 6.3 installed on two machines. Machine A is a workstation and has two interface eth0 and wlan0. Using eth0, it is connected to Machine B (public facing server) with static IP address. Both ...
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1answer
326 views

How to set up a “child” proxy that doesn't need a “parent” proxy

I run Linux on a laptop that is sometimes on a corporate network which uses an NTLM proxy server, and thus I have cntlmd running on the laptop as a child proxy to connect to the parent (corporate) ...
0
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1answer
19 views

PinguyOS latest version - networking problem

I installed PinguyOS on a friends computer. This computer is now displaying the following strange behaviour: Unable to set custom network. There seems to be only a provision for DHCP based ...
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3answers
3k views

How do I get to use .local hostnames with Arch Linux?

If I'm using Ubuntu or Linux Mint (the only two flavours I've tried and know work for sure), I can run something like this: wayne@myhost$ ssh wayne@otherhost.local And the name is automagically ...
2
votes
1answer
38 views

Specifying DNS settings to override those of DHCP

Every 6 months or so I cannot access the DNS on whatever router I'm using. usually have to add the nameserver by hand to the /etc/resolv.conf file. I've tried adding Google free DNS to the file and it ...
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0answers
60 views

Internet connection being lost after about 10 seconds

Okay so I have looked at this post Network connection drops after a few seconds, Which looks similar to the problem I am having but I have only just got Linux and can't work out what to do. Before I ...
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Making proxies on Debian

Hi guys I am trying to create SOCKS Proxies on my VPS and currently am not getting too far so any help is well appreciated. Here's a few details on my VPS: It is running Debian linux, has 512mb ram ...
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3answers
4k views

Yum update problems on CentOS 6.5 minimal as VMware guest

INFO: I am using Windows 7 Pro (64bit) with VMware Workstation version 10.0.1 . I am using CentOS(64bit) 6.5 minimal, for the first time. I am running this from my workplace network, which may use a ...
2
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0answers
29 views

How to set up networking on a per-user basis?

I would like to set up access to corporate VPN for just my user account on my computer; not for the other accounts and certainly not for the guest user. To achieve this, I presume, I need to ...
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0answers
29 views

Can I change uuid for network interface in ifcfg-eth* using uuidgen?

I'm creating a script which configuration the network interfaces. The script which generates /etc/udev/rules.d/70-persistent-net.rules and names interfaces to my preference. In CentOS 6.5, my ...
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0answers
17 views

Port shown as online when no program is listening [closed]

I installed MySQL and noticed that the port is open. After trying to change some things in its config it still was, so I was trying to "close" the port via iptables, unfortunately it doesn't work as ...
4
votes
2answers
514 views

BIND9 as a DNS server refuses requests

I am trying to set up a DNS server on Amazon Linux using BIND9. It has to act as a master nameserver for a lot of domains. I have imported all of the DNS zone files using NamedManager (a web ...
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0answers
18 views

wlan connection stops working when ppp 3g connection is running

I have ZTE MF669 modem and RTL8188eu wifi card. My wifi address is fixed (192.168.1.14). Modem gets address from 10.0.0.0/8 subnet. My wlan connection stops working when I connect to 3G network. I ...
3
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2answers
248 views

Exposing NFS mount via USB

I know enough linux to be dangerous - apologies if my terminology is incorrect. I have an electronic drumkit that has USB into which I can plug a flash drive with MP3s on it. The drumkit has no ...
2
votes
1answer
809 views

Terminal server (ser2net) to configure new HP procurve switch

Switch: HP ProCurve 2910AL-48G - J9147A This switch is brand new straight from HP. Anyone familiar with ser2net for creating a terminal server to connect from usb>serial>console port on a HP ...
2
votes
1answer
681 views

Quickly check whether many network hosts are up-and-running

Objective: check if a host is up-and-running on the network, with a method that can be efficiently parallelized over many hosts. Emphasis on a QUICK turnaround of the check. Reason to emphasise ...
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0answers
28 views

Weird authentication with Exchange server

I'm using Evolution with evolution-mapi to access an Exchange e-mail server. It has worked flawlessly in the past, but recently it will fail to authenticate, asking my password endlessly. If I enter ...
5
votes
4answers
501 views

Automatically acquire new IP address in new network

I'm running a Centos virtual machine on a laptop using a bridged network connection to avoid double-NAT issues, with the address assigned via DHCP. This works fine until I move the laptop to another ...
2
votes
1answer
87 views

Network connectivity problem - Debian 6 server

I'm having a problem with a Debian 6 server where it looses network connectivity and doesn't come back (server does not respond to pings, and can't connect to any services). The problem happens ...
5
votes
4answers
317 views

History of IP addresses that accesed a server via ssh

It has come to my attention that a server of mine has been hacked and infected with a known chinese botnet. It was a prototype/testing virtual machine with its own static IP(US address) so no harm ...
3
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1answer
86 views

Linux: How to auto-configure IP routing based upon ping results

I've got a linux server with two possible connections to the net: one is a slow, high-latency cellular modem (ppp0), and the other is through fast wifi->broadband (wlan0). The problem is that the ...
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3answers
963 views

Can conky monitor other Linux computers on the network?

I know conky can monitor my personal computer, but can it monitor the other Linux servers I have on the network? I'd like to see data on CPU and memory usage and some critical processes each server ...
1
vote
1answer
490 views

Network fail on FreeBSD: Ping to router fails, but router believes computer is connected

I have a TP-Link TL-WN851N wireless adapter, which is based on an Atheros device. When I attempt to connect to my WPA2 wireless network, ifconfig wlan0 tells me that the connection is 'associated'. My ...
3
votes
1answer
408 views

Accounting for /proc/net/dev reported traffic

I noticed that according to /proc/net/dev I am constantly receiving around 6Kb/s on my wireless usb interface. But I can't account for anything even close to that with the individual connections that ...
6
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1answer
721 views

Debian Wheezy + Hostapd 1.0 + ath9k randomly failing

I got a problem with my soft AP. I got an old PC running as router which has 3 NIC and 1 wifi PCI card TP-Link L-WN751ND. This box runs Debian Wheezy, hostapd, dhcpd etc. The problem is that AP ...