Tagged Questions

Managing and using network connectivity on a unix system

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0
votes
1answer
78 views

Trying to connect to gateway in static ip network

I have arch-linux-arm running on a raspberryPi. The network I am in uses static IPs. gateway IP is 192.168.178.5 IP for my device is 192.168.178.201 To connect to the internet I use: ip addr add ...
1
vote
1answer
448 views

Using ping on multiple interfaces on a NIC

I have two systems and each have a NIC with two ethernet ports. One system has a verified NIC card, but the other has a NIC which has to be verified. I use ping to verify whether the interfaces on ...
0
votes
0answers
20 views

Once connection is lost wi-fi cannot be brought up again

I'm running Arch, using netctl-auto to connect, and it connects well. However, as soon as the connection is lost (e.g., timed out in a network where connection must be renewed after a period of ...
0
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0answers
134 views

How to make linux see my internet connection?

I'm sort of booting off of a Mint 17 LiveCD (the situation is described here: How can i make my pc boot back into windows?) and the network does not work. It's wired if it matter. I've also tried to ...
1
vote
1answer
136 views

masscan. how to configure Linux?

I've set this in my sysctl.conf: net.netfilter.nf_conntrack_max=268435456 Because, this border 16,777,216 achieved very quick. Also, I've decrease timeouts: net.ipv4.tcp_fin_timeout = 30 ...
1
vote
1answer
81 views

DDNS (dynamic-dns) setup and adding a hostname to a device (to be visible on the network)

How do I provide a fixed Hostname to my device so that a netscan can shows up the device name across all platforms? How can I reach the device using the hostname/MAC-ID (something which is fixed) ...
5
votes
1answer
62 views

Testing whether a file is local

I need to test in a script, whether a file is from a network mount or truly local. To be more clear: I need to test, whether parsing the contents will be fast or slow, but for my case local vs network ...
5
votes
1answer
66 views

What's the exact behaviour of the command: ip address change?

I have been fiddling with IPv6 and address lifetimes. I found out that the valid_lft attribute will make a v6-address disappear automagically, if used correctly. To extend an address' lifetime I would ...
2
votes
1answer
304 views

set ip default outgoing in centos

I have server which has Centos and I want to change the outgoing IP address. This is the output of my route and route list commands. [root@marketport tmp]# route -n Kernel IP routing table ...
1
vote
0answers
621 views

Guest VMs unable to ping each other within a custom host-only network in vmware workstation

I have created a custom host only network VMNet2 (without dhcp) in VMware workstation and connected my three VMs with this network. But the problem is: I cannot ping any VM from any other VM. However ...
0
votes
0answers
20 views

lost packets using traceroute

using mytraceroute I see 50% of ICMP echo request lost: 192.168.1.212 is internal server while 192.168.5.1 is my router: Host Loss% Snt Last Avg ...
3
votes
3answers
123 views

What happens to local LAN traffic on linux to non-loopback addresses?

One thing I've never quite understood on Linux is what happens to local traffic that isn't directed at loopback. For example, given the following network setup: [root@pe-323-master ~]# ifconfig eth0 ...
3
votes
0answers
81 views

Trying to understand Auto reconnect WIFI method

Iv'e found this method of reconnecting the WIFI dongle from this post , but want to be clear on how it works, before I try and implement it. 1) Go to /etc/ifplugd/action.d/ and rename the ifupdown ...
2
votes
2answers
1k views

How do I set the preferred wireless network in Linux Mint 17?

I'm currently in an environment with two wireless networks: OrganizationFoo, which is present pretty much everywhere I go, and OrganizationFooSubset, which is only present in a certain location. When ...
1
vote
1answer
1k views

SSH: Network is unreachable (caused by router)

I've searched solution in Google for 3 days, when I decided to write here. I have a router, so in my house is WLAN. I use laptop when I stay at home. In another city in my office I have a second ...
1
vote
1answer
124 views

Capture web traffic grouped by individual TCP streams

As far as I know a HTTP request and response constructs one TCP connection. To debug a web application on a GUI-less server, I'd like to be able to capture these TCP streams in a single ...
3
votes
2answers
84 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 ...
2
votes
3answers
488 views

Unable to access CentOS setup Network Configuration after attempting Python update

I attempted to update Python on my CentOS 5.6 VM and have encountered some issues afterward. Initially, yum wouldn't work, but I have resolved that. However, now I am unable to access the Network ...
1
vote
0answers
126 views

Packets sent through TUN interface not routed

I have a C program attached to a TUN interface. In my C program, I'm building packets and writing them to the TUN interface. Now to check if packets are really sent from my TUN interface I use ...
1
vote
2answers
58 views

Start the networking from scratch

Let us assume I have a computer that for some reasons has had all the networking information, in particular the stuff in /etc, wiped. Furthermore whatever caused the information to be wiped prevents ...
1
vote
2answers
1k views

eth0 not installed on CentOS

How would I go about installing eth0 on CentOS? When I do ifconfig -a, eth0 is not there. Here is the output of ip link: 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue link/loopback ...
0
votes
0answers
64 views

Tools to inspect local network, and find local IP address of device?

This is my specific context (Latex/TikZ code for the diagram below): Now this local "Router", has broke down several times, and several different devices have had its role (sometimes they have a ...
1
vote
0answers
82 views

How do I control ip routing in the new firewalld?

I have the following scenario: Our fedora server is connected to the internet on eth0 and has a second nic, wlan0 acting as an access point. The purpose of the access point is to provide a connection ...
1
vote
1answer
333 views

Arch Linux Ethernet to WiFi bridge

I want to use a Raspberry Pi running Arch Linux to extend my WiFi network. My situation is that I have a spare WiFi router that I want to use to expand my WiFi reception range as well as give me a few ...
0
votes
0answers
9 views

CentOS Run Command as Root on Startup [duplicate]

I need to designate my network card device p4p1 with a certain IP address on startup. The command I am using is as follows : /sbin/ip addr add 129.100.14.2/24 dev p4p1 this works from the command ...
0
votes
1answer
89 views

What is the foolproof/proper way to set hostname and domain on CentOS

I've seen a few ways of changing hostnames of domain names. One way is to issue the hostname command followed by the name such as: hostname localhost.localdomain /etc/sysconfig/network also has a ...
3
votes
3answers
70 views

linux interface to get connected IPs

Is there an interface to get the currently connected IPs and their state in Linux? I am aware of ss and netstat, but I want to use /proc/ or some other "official" kernel interface that already has ...
3
votes
1answer
141 views

Ubuntu eth0 not detected

After installing a new version of this distro, eth0 is not detected automatically. command inxi -SNxz result: Network: Card-1: Broadcom NetXtreme BCM57786 Gigabit Ethernet PCIe bus-ID: 01:00.0 ...
1
vote
1answer
27 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
votes
0answers
43 views

Flow control configs for ethernet interface gets reset in few seconds

I set the RX & TX flow control (aka "pause parameters") configs to an ethernet interface, as such: sudo ethtool -A eth0 rx on tx on When viewing the configs with sudo ethtool -a eth0, only RX ...
5
votes
1answer
3k 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 ...
1
vote
2answers
64 views

Is it bad to select remember me option in the browsers of a compromised machine?

I was reading an article on how to sniff network packets. (of course for knowledge purposes only). I came across these particular lines. For instance, say I was sniffing traffic on the network, ...
1
vote
1answer
90 views

Configure NAT filtring behavior with iptables

I'm using this rule to configure SNAT: iptables -t nat -A POSTROUTING -o eth1 -j SNAT --to-source 193.49.142.107:4000 I want to specify a rule to filter out packets not destined to the internal ...
0
votes
0answers
43 views

How can I make CentOS 6 treating WiFi flexibly like Ubuntu 12.04?

In my office, I have AT&T Uverse. The router is a 2wire 3600HGV. The WiFI is provided by a Cisco Linksys E1000 that is plugged in the 2wire device. With my notebook running Ubuntu 12.04 LTS ...
1
vote
2answers
63 views

what is 'smakynet' in the netstat result?

after logging into a server, I used netstat to check out the ports of this server and wanted to find which port was communicating with me My IP is 143.248.143.198 and my search results are like ...
1
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0answers
19 views

Why do I get “authentication” errors on this “Open” configuration?

I have the following ifcfg-wlan0 file: DEVICE=wlan0 BOOTPROTO=none ONBOOT=yes IPADDR=192.168.5.1 NETMASK=255.255.255.0 NETWORK=192.168.5.0 NAME=wlan0 USERCTL=no the following dhcpd.conf file: ...
2
votes
1answer
62 views

Why is the 'foreign address' not IP address but something like this?

I never learned network programming and this kind of stuff properly. Only know very basic stuff like IP address and just a vague concept of what ports and TCP/IP are. Here, I connected to my lab's ...
1
vote
1answer
164 views

Randomize external port when doing NAT with iptables

I want to configure a NAT behavior different from the default one implemented by iptables. In this example: iptables -t nat -A POSTROUTING -o eth1 -j SNAT --to-source 193.49.142.107:2000-400 The ...
1
vote
1answer
72 views

Monitor internet for dropouts

I've been having issues with my wifi with frequent drop outs. So I've decided to check if the drop outs are wifi related or internet related by connecting my laptop via ethernet and monitoring it for ...
3
votes
1answer
99 views

Replacement to CUPS Browse Protocol

The CUPS "browsing" protocol was marked as deprecated being removed at v1.6 of CUPS, due to problems with broadcast and managed networks/WiFi. It's an UDP protocol to broadcast information about ...
1
vote
1answer
449 views

ssh ubuntu to android : No route to host

I am trying to log into my android phone (running sshdroid), using my laptop (ubuntu 12.04). I am on a university sub-network (on wifi), and so is my phone. I tried the following command: ssh ...
3
votes
3answers
185 views

Is there some way I can start a (repeating) ping while the network is unreachable?

My ping command (on Debian 6 or 7) will repeatedly attempt to ping a server even while the network is down, if the network was up when it was started. Is there some way to start ping while the network ...
3
votes
0answers
26 views

Linux network stops when transferring files [duplicate]

Running Debian, when transferring files from the server to my pc, the transfer is suddenly interrupted. Some smaller files (couple of MB) seem to work most of the time, but bigger files mostly fail at ...
3
votes
2answers
466 views

WiFi not working after restoring from hibernation (authentication times out)

My Intel 6205 wireless network card does not work after hibernating. It sometimes also does not work on boot, failing in the same way. Occasionally, it also stops working after ~10 minutes of ...
1
vote
1answer
68 views

LVS is not accessible from the outside

I'm currently busy setting up a LVS - Linux Virtual Server: root@debian1:~# ipvsadm -L IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port ...
0
votes
0answers
213 views

Apache server in raspberry PI not visible from outside( public IP)

I have made a fresh install of Arch Linux ARM into a Raspberry PI and I mounted there a LAMP, all fresh. I have another Arch(x86) in my laptop with Apache also there, and as far as I know, two web ...
1
vote
0answers
74 views

Local Client/Server communication using TUN interfaces

I want to establish a local communication between a client and a server using TUN interfaces. The client program will be attached to interface TUN1 and we suppose that it has IP address @IP1. The ...
1
vote
0answers
33 views

Is arp periodically called to check connectivity?

Do most of linux implementations periodically make arp requests to check connectivity? I am trying to migrate an ubuntu virtual machine and, after migration, it just loses network connectivity.
0
votes
0answers
74 views

windows - suse rsh denied

I'm trying to execute a command through rsh from a Windows host to a Suse (SLES 11 SP2) host. The Suse (192.128.40.10) has xinetd installed and the service is running. I also made sure that the ...
2
votes
0answers
174 views

Network connectivity issue between different hosts from a network namespace in one host

I have created two Ubuntu 12.04 VMs using VMWare Player with NAT network configuration. I am able to ping them from each other. After that, I created a network namespace in one of them and add a ...