Managing and using network connectivity on a unix system

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ethernet driver - without using DMA?

I am writing Ethernet driver. I would like to do it in 2 steps: write it without DMA (simple memcpy) rewrite it using DMA. I would like to ask if it is possible to do it first without using DMA (...
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(SOLVED) No Internet through Terminal on Virtualbox without Proxy [on hold]

I am currently using Virtualbox on my Windows PC to run Linux, but when trying to do any terminal commands that require internet, such as apt-get update or ping 8.8.8.8 I get an error (that changes ...
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1answer
12 views

Close outer container from Internet with iptables

How to close exact docker container port (for example 7777) from access from Internet with iptables. But the other containers should be reachable.
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Why cannot I ping an xen domU through the bridge?

I am on a Debian upgraded from 7.11 to 8.5, so the xen package is upgraded from 4.1 to 4.4. I do not know much about networks, but when I see a diagram like this (taken from the Xen Networking wiki ...
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2answers
20 views

Ubuntu wifi connects and works for 5 minutes then stops working while remaining connected, need help

so, a few months ago i decided i wanted to make the switch to linux on my laptop, but to play it safe, i chose to dual boot. right now i have my 1TB hard drive split even between ubuntu 14.04 and ...
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1answer
22 views

how does a google cloud compute generated SSH key lookup the VPS instance?

If I manually create a key, rather than using the gcloud CLI console, can I also configure the public key so that it will look-up the connection as this config seemingly does: thufir@mordor:~$ ...
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2answers
53 views

Traceroute — where does it end when user is SSHed?

When you traceroute a user SSHed into a server, does the traceroute end with the server or the computer of the person SSHing? Or is the answer more nuanced?
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2answers
35 views

How to permanently remove eth0.x in CentOS

I'm trying to remove eth0.x and keep eth0. While ifconfig lists both eth0.1 and eth0.500, I didn't find their configuration files /etc/sysconfig/network-scripts/ifcfg-eth0.x. I tried ifconfig eth0.1 ...
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1answer
21 views

Disable Primary NIC but leave Virtual Nic tied to Primary NIC Active - Virtual_IP Troubles

I am having trouble setting up a Virtual/Floating IP. In this specific circumstance I am using Pacemaker+Corosync to manage just 2 Virtual IP's. One is internal and the other is external to our SIP ...
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2answers
21 views

Tracking traffic through a filtered intranet connection

I am performing a traceroute (I also tried a curl out of curiosity, that just stalls) on a publicly available website (so I know my computer should be able to and is allowed to reach it). However, ...
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1answer
24 views

Why tcpdump captures many packets with “(tcp-syn) != 0” but not with “tcp[tcpflags] & (tcp-syn) != 0”

I want to capture the initial handshake of a UDP connection between my computer and a VPN server. For that I'm using tcpdump but I don't understand why : tcpdump dst port 1194 and "tcp[tcpflags] &...
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1answer
24 views

debian libvirt 2 subnets

I want to create a network like this: I have a virtual host which is conntected to my physical router with eth0 and ip4 address 192.168.178.100. I create a virtual machine dmz which connects '...
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22 views

How can I have a pingable IP but the wireess interface is unassociated?

I've been installing wireless networking support on a base image and have ran into something really strange. Look closely at the output of ifconfig and iwconfig. I have a valid dhcp assigned ip from ...
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1answer
17 views

What do you explain my issue with if I can send an MTU packet of this size? [duplicate]

See this: Some websites load while others load forever in Linux Mint 18 And this: Is there anything suspicious in my ifconfig? Also don't forget about this: ping -c 1 -s 1500 8.8.8.8 PING 8.8.8.8 (...
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0answers
10 views

Shape traffic flowing through dd-wrt router

I am working on an experiment in which several devices connect to each other via a wireless network. I want to be able to shape the traffic between the devices, i.e., control the bandwidth, latency, ...
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4 views

How do I route Internet from wlan0 to local network on wlan1 and eth0 in Linux?

I want to connect eth0 and wlan1 as one local network plus route the Internet from wlan0 to the local network. Linux (Debian, Raspbian, Linux Mint) easily bridges Ethernet to Ethernet but I run into ...
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16 views

Maximum number of iwlist scan results

This is a question with reference to the command line utility 'iwlist' on debian. I have a remote machine which I need to produce a list of networks in the area. I use iwlist scan and sometimes my ...
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25 views

How can I change the connection I saw in ifconfig?

It appears I have approached the problem. In Linux Mint 18 64-bit when I type in ifconfig there is enpxxx (I typed in xxx instead of real) lo and ppo and some sites load while others don't. When I ...
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45 views

Is there anything suspicious in my ifconfig? [duplicate]

I'm on Linux Mint 18 64-bit and if you check my old posts I was having problem of some sites loading and others loading forever. Below is the output of ifconfig, is there anything strange there? ...
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1answer
33 views

Static IP address setting failed

/etc/sysconfig/network-scripts/ifcfg-eth0: EVICE=eth11 TYPE=Ethernet ONBOOT=no NM_CONTROLLED=yes BOOTPROTO=static ...
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2answers
32 views

Failover default route on primary link outage

I have 2 ISPs, and a server with two IP addresses, something like this: eth0: 161.0.0.2 eth1: 171.0.0.2 I have set www.example.com with two A records, so that I have DNS LB. App is working fine ...
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1answer
38 views

How to share a connection between two interfaces

Okay so either I am dummer then I look or there is a real problem here. Fedora 23 Interface 1: enp9s0 192.168.1.137 255.255.255.0 Wired (Internet connection) Interface 2: wlp0s20u14 192.168.10.1 255....
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32 views

Why I can not open port on redhat?

I want to host sinopia (https://www.npmjs.com/package/sinopia) on the server. My problem is I can not open port for it. Default port for sinopia is 4873. OK. Lets start sinopia and then try to ...
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45 views

Some websites load while others load forever in Linux Mint 18 [closed]

I have installed Linux Mint 18 64 bit and noticed Google and Youtube and others loading flawlessly (even HD videos play) but some sites like Wikipedia don't show up even though the tabs in Mozilla ...
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2answers
23 views

if a HTTP request is like HTTP://IP/path with a http proxy, will it go to Internet or Ethernet [closed]

AWS enterprise VPC http proxy exists Without the HTTP proxy, curl http://169.254.169.254/lastest/meta-data successful, but disconnect to the Internet. This IP address is not Category A, B, C. Use ...
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1answer
22 views

Why do I have more packets than bytes? [closed]

I don't know how to explain this. mind blown. ip -s link 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether RE:DA:...
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1answer
26 views

Network unreachable

Just did a fresh Arch install but when I ping 8.8.8.8 it says connect : Network is unreachable. I saved iptales rules in /etc/iptables/iptables.conf but they won't load at startup. ip a says that my ...
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39 views

How to determine how much time a process is blocked waiting for networking (socket) activity?

We are having issues with high load (top and uptime) but high CPU idle. Usually, that means high IO wait but that's also low. I believe IO wait typically does not include time a process is blocked ...
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0answers
24 views

Automatically to connect to open network with the highest signal strength [closed]

How can I tell Arch to connect to whatever open Wi-Fi network has the highest signal strength? (I want this behaviour with a honeypot partition or user in case my computer is ever stolen.)
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18 views

No connection on Debian with “USB ethernet” (mobile phone sharing 3G)

I just installed debian on my amd64 PC and I need the 'build-essential' pkg to make my wifi drivers...So the only solution I found is plug in my phone and share my data connection. Nevertheless I ...
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1answer
14 views

Route traffic for a single IP out of eth0, the rest out of wlan0 [duplicate]

I have my laptop connected to an internal network on eth0 and an external network on wlan0. How can I configure my routes to forwarded all traffic for 10.1.1.1 out of eth0, and everything else out of ...
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21 views

Bridged VirtualBox VM: Is there an internal Host IP address

I'm running a VirtualBox VM in bridged network mode. Is there still an internal IP address for the Host? (I don't want traffic to my host going over the bridged network) To clarify, I do want my VM ...
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0answers
12 views

Detect / log network changes in rasbian/ linux

I just stated using raspberrypi, Trying to learn some networking and linux stuffs. I want to log or detect network changes like If my machine joined a network. If any device joined the network of ...
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1answer
15 views

XYMon-Client status not showing in XYMon Server

I have installed XYMon server successfully, but I can't get the client information to show. It took me a while to figure out, but if you add a host to the server that doesn't have the client, it still ...
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0answers
20 views

Apt-get update/update manager downloading slow [closed]

I am running Linux Mint 18 and my sudo apt-get update/update manager speeds were fine until today. Now they can't even get past 60 kiBs, I have tried changing servers but it was in vain, as all of the ...
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32 views

Outgoing network connections fail, incoming ssh login delayed [closed]

I'm having the following trouble with outgoing connections in CentOS: yum cannot connect (just hangs on "Determining fastest mirrors") Could not retrieve mirrorlist http://mirrorlist.centos.org/?...
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1answer
33 views

Network slowness [closed]

I am facing an issue in my project.We support an App which is hosted on a unix server. Partners try to access the same from many regions. Now some users in an region say "R" are complaining about ...
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1answer
22 views

Why is it taking so long to establish a LAN connection on boot?

I have an issue with a virtual machine taking time to connect to the local network on boot. I create a virtual machine using the following command: virt-install \ --connect qemu:///system \ -...
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1answer
44 views

Is it possible to ping 8.8.8.8 from two interfaces connected to diffrent WANs

I'll start by explaining the situation. I started My project using a raspberry Pi 2 model B and installed Fedora Arm on it. My current Goal is to be able to connect the pi to internet through an ...
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0answers
26 views

Adding network route for new subnet?

I've found several related questions, but none of them seem to be solving my particular problem. I have a server at 10.a.b.1, and another server at 10.c.d.2. We're in AWS EC2 classic with no control ...
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1answer
24 views

Using qdisc prio under htb class

I have 2 services, both operate over the same interface. Service A goal is keep high bandwidth while sending massive amount of data. Service B goal is low latency. Service B packets should always ...
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1answer
43 views

List *all* IP routes to a destination in the Linux routing table

ip route get 2607:f8b0:4005:804::200e will show me the best (longest prefix) route to google.com, but it does not show all routes that can take me there. Right now I am using ip -6 route show | grep ...
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0answers
23 views

ssh: permission denied (publickey) after restoring to a backup that was known to work at the time of backup [duplicate]

So I have a few servers set up behind a bastion. I usually hop from bastion -> server A -> server B using agent forwarding. One day I try to log into server B and for no reason apparent to me I gives ...
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1answer
42 views

eth0 interfering with wlan0. pi networking

I've been trying to nail down the WiFi on my pi. In short its frustratingly unreliable when it starts up. I'm want it to be on a static IP and to Currently I have a monitor hooked up to the pi for ...
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2answers
32 views

How can I resolve an IP address to a hostname in Arch Linux? [duplicate]

What is the most concise way to resolve a hostname to a local IP address in Arch Linux?
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2answers
46 views

What are the rules that determine the default contents of an /etc/hosts file?

What are the rules that decide what goes into the initial /etc/hosts file of a a server with these characteristics? It has a internal IP address for the internal subnet. which is in the 172.20.x.x ...
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1answer
15 views

Use network adapter in Kali Linux using vmbox?

I would like to use my network adapter from my laptop in kali linux. I tried changing the network settings inside vmbox but I can't get it to work. I am using oracle virtual machine. Kali linux is ...
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1answer
39 views

create listening port on IPV6 WITHOUT netcat

I wish to be able to listen to a port (eventually creating a bind shell) on an IPV6 address. I have tried using the netcat installed on the linux (debian) machine I am trying to bind. sadly it seems ...
0
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1answer
54 views

Redirect all outbound UDP DNS request to a localhost DNS server

I am trying to redirect all outbound DNS request(made from local) to a tunnel running on localhost listen for UDP on 127.0.0.1:5353. iptables -t nat -A OUTPUT -p udp --dport 53 -j DNAT --to 127.0.0.1:...
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1answer
22 views

Not getting ip when running dhcpcd wlan0 inside startup script

Rasbian on a Rasberry PI zero. I have disabled the networking and dhcpcd services from startup and want to start networking and get an IP from within my own script, which is initiated from a custom ...