Managing and using network connectivity on a unix system

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29 views

Last data traffic time for a TCP socket

Is it possible, to find out when was the last time there was any traffic on an opened TCP socket? Keepalive and timeout timers are based on this statistic, so I guess it has to be stored somewhere. ...
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5answers
158 views

How to measure network traffic usage?

I want to know how much bandwidth my server is using. How much in, how much out. How do I know that? I think there is a software, netstat or something that took care that sort of thing.
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0answers
142 views

Ping command results in packet loss

Whenever I ping on my personal computer, nothing gets displayed other than a single statement. Upon stopping execution, I see that several packets were transmitted in the statistics. On top of all ...
4
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2answers
102 views

Preprocess packets send to/from interface

Is it somehow possible to intercept packet data just before it reaches an interface, and just after it is received? E.g. preprocess it and send it back on its way? I wanted to create a custom ...
3
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1answer
41 views

Monitor outgoing web requests as they’re happening

I want to see a list of all outgoing HTTP requests from my desktop. I think it should be possible to monitor HTTPS hostnames as well for local clients using Server Name Indication (SNI). OS X has a ...
0
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1answer
176 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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2answers
65 views

Port multiplexer sslh: why is it so resource-intensive?

I've just discovered the existence of sslh. I tried to install it on my 512MB RAM VPS running Debian 7 wheezy. After having configured sslh, I tried to connect to one of my apache2 virtual hosts, and ...
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1answer
42 views

Connecting to Verizon Mifi (wirelss hotspot) breaks everything

This question is obviously network related, but I thought it would be more appropriately placed in this forum because it's really not so much a connectivity issue. I recently got my hands on one of ...
4
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1answer
55 views

Create map network_iface_name <--> IPv4 address

I'd like to implement a bash script that creates a mapping between the network cards (or interfaces) names in my computer and their IP address (in CIDR format, if possible). The goal is having ...
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0answers
48 views

Kioptrix Level 1: Determining IP information for eth0 failed

I'm trying to set up a Kioptrix VM in VMware Player, in order to analyze it from a separate VM using Kali Linux. The VM can be found on this page: http://www.kioptrix.com/blog/test-page/ When ...
3
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1answer
82 views

How to tell if two ethernet interfaces are on the same lan?

I have to secure interfaces on Linux servers by setting bonding interfaces. The cabling information is not accurate. Is there a simple way to know if two interfaces are connected to the same LAN? ...
0
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1answer
48 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 ...
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1answer
101 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 ...
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0answers
16 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 ...
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0answers
76 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 ...
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1answer
44 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
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1answer
60 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
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1answer
60 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 ...
2
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1answer
105 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 ...
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0answers
109 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 ...
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0answers
19 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
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3answers
66 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
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0answers
67 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
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2answers
313 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
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1answer
239 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 ...
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1answer
70 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
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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 ...
2
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3answers
190 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 ...
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0answers
56 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 ...
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2answers
57 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 ...
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2answers
283 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 ...
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0answers
45 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 ...
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0answers
60 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
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1answer
126 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
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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
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1answer
70 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
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3answers
57 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
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0answers
90 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
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1answer
20 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 ...
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0answers
18 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
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1answer
419 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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2answers
60 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, ...
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1answer
49 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 ...
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0answers
27 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 ...
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2answers
42 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 ...
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0answers
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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
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1answer
49 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 ...
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1answer
74 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 ...
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1answer
41 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
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1answer
62 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 ...