Managing and using network connectivity on a unix system

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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 ...
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1answer
37 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
67 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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3answers
47 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, ...
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2answers
62 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 ...
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1answer
299 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 ...
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1answer
325 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
487 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 ...
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2answers
407 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
337 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) ...
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1answer
22 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 ...
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1answer
46 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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21 views

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
6k 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 ...
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0answers
30 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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53 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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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 ...
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2answers
270 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 ...
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1answer
831 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 ...
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1answer
701 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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32 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 ...
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4answers
511 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 ...
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1answer
95 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 ...
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4answers
373 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 ...
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1answer
101 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
1k 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 ...
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1answer
506 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 ...
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1answer
450 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 ...
2
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2answers
332 views

How do I route a spare network interface through an SSH tunnel?

I just bought a Raspberry Pi and I am wanting to route an ad hoc wireless network interface fully through an SSH tunnel that was created using another wireless interface. I want to do this so that I ...
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1answer
132 views

Consistent network interface name ubuntu using pci slot

One can set consistent interface naming via mac address by modifying /etc/udev/rules.d/70-persistent-net.rules. Can you establish consistent interface naming by PCI slot number? (I tried but failed) ...
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85 views

Run root script or command as root in startup application in linux mint

I have a wireless adapter that used to work in Linux mint 16 (dwa 171) after installing drivers for it. Now it won't work the same way anymore since I upgraded to linux mint 17. I've found the only ...
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1answer
287 views

ifconfig command not found

I've just installed CentOS7 as a virtual machine on my mac (osx10.9.3 + virtualbox) .Running ifconfig returns command not found. Also running sudo /sbin/ifconfig returns commmand not found. I am root. ...
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35 views

How to debug the network issue in case of blocked database connections

I am trying to understand if my analysis of the below information is correct. For all the 3 scenarios listed here, port 80, port 3306 and port 22 are open in the server's firewall. Also, for all the 3 ...
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why not combine iwconfig and wpa_supplicant?

It's strange that so many years passed, iwconfig still only support WEP, wpa_supplicant only support WPA, why not combine them?
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1answer
23 views

Naming PPP interfaces

I have two PPP peers, dsl-line1 and dsl-line2 which are configured with pppd on Ubuntu (Server) Linux. They are brought up by the /etc/network/interfaces file with the auto thingy however each PPP ...
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2answers
611 views

Split DNS (bind9), match-clients any doesn't work?

I've been fighting with this for the last few days. A few of my entries have external and internal IP's. My internal network is 10.0.0.0/8. When I nslookup pc1.clase.net internally it responds with ...
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1answer
435 views

Network bandwidth measurement on Solaris

I want to install pathtest or a program like it in a Sparc server running solaris 10. The purpose is to make a speedtest server to my remote sites. It is mentioned in pathtest FAQ that it only ...
4
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1answer
98 views

Can iptables be used to monitor TCP timeouts/resets system-wide?

I'm trying to determine if an application's connection to a database is internal to the application or due to a networking event. This seems like something netfilter would have system-wide visibility ...
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2answers
66 views

Testing the Success of a Congestion Algorithm

How do you test whether a particular congestion algorithm is working for you? I ask because it's not as if I can easily re-create a representative workload for most algorithms. I'm current looking at ...
3
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1answer
52 views

nc both fails and succeeds

Platform: RHEL 5.10 netcat Version: 1.84-10.fc6 I was trying to figure out if my inability to ssh was TCP-level and usually I use nc for this. This time, however, I got something unexpected. ...
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62 views

Is this kernel warning a major problem that needs my attention?

Our Linux based Thecus N12000 NAS recently experienced this message in its dmesg log. [2014-05-21 11:34:56] ------------[ cut here ]------------ [2014-05-21 11:34:56] WARNING: at ...
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2answers
62 views

No eth0 after HD transplant

After moving the hard drive of a makeshift server to another compatible hardware (64-bit, same processor "generation", laptop->desktop) configuration, networking fails to initiate. Specifically: ...
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0answers
41 views

Unable to start apache

I'm running CentOS7 in virtualbox on a mac (osx 10.9.3). Ultimately, I want to acces the website on my Guest VM from my Host. I can Ping and SSH to VM but I can't acces the webpage when entering the ...
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1answer
1k views

Ubuntu: wire network is not stable and must restart network-manager periodcally

I don't know why my wire network now is not stable. After a short time of using, maybe 30 minutes, 15 minutes or maybe just 2 minutes, my network is down. When my network is down, I must run this ...
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1answer
257 views

ixgbe: increase rx performance

I have an Intel 82598EB 10GBE NIC. I need to receive traffic without packet loss. Data rate is 4-5 Gbps, packet size is 1500-9600 bytes. I had already configured smb and irq affinity. I also tried ...
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1answer
178 views

Understanding ifconfig stats

Please help me understand ifconfig stats, in particular over what time period are they? From the example below the combined receiving bytes for both interfaces is 7.7 GiB. Is that since midnight? ...
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1answer
41 views

Allow non-root unmodifiable sofware to bind to ports 80 & 443

The company I'm in uses the Java Secure Application Manager to "secure" non-internal connections their webmail and electronic collaboration software. Aside from using expired certificates, and ...
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2answers
2k views

hostapd will not start via “service” — but will start directly

I am having trouble getting hostapd to start as a service. It fails when I try to start it: $ sudo service hostapd start [FAIL] Starting advanced IEEE 802.11 management: hostapd failed! From what ...
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2answers
4k views

changing the names of network interfaces, debian wheezy

I'm trying to set a name for an interface, "ethLan" instead of eth0. Doing so also ensures that the if's name will remain consistent at every reboot and kernel. I did find some articles in the ...