Managing and using network connectivity on a unix system

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12 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 ...
0
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0answers
19 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 ...
3
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2answers
2k views

Is it possible to add some 'PXE Network Boot' option to GRUB?

This is an example of my available GRUB menu boot options: 1 menu label ^ 1) Xubuntu 14.04.02 LTS 2 menu label ^ 2) Windows 7, x86 & AMD64 3 menu label ^ 3) Windows 8, ...
31
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2answers
111k views

Sending messages to another user

Is there any command to send messages through the Linux shell to other people on the same network? I'm using write user and then write the message itself. But there's any command that doesn't show my ...
0
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0answers
40 views

Is there anything suspicious in my ifconfig?

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? ...
0
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1answer
28 views

Static IP address setting failed

/etc/sysconfig/network-scripts/ifcfg-eth0: EVICE=eth11 TYPE=Ethernet ONBOOT=no NM_CONTROLLED=yes BOOTPROTO=static ...
0
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1answer
521 views

nmcli connection activation failed

I was able to create a wifi hotspot on my debian 8 install using network tab under gnome settings. I was trying to do the same using nmcli but it always shows $nmcli con up id Hotspot Error: ...
0
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2answers
25 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 ...
2
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1answer
2k 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 ...
0
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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 ...
15
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4answers
43k views

Output traffic on different interfaces based on destination port

My question is basically the same as Only allow certain outbound traffic on certain interfaces. I have two interfaces eth1 (10.0.0.2) and wlan0 (192.168.0.2). My default route is for eth1. Let's say ...
0
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1answer
32 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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0answers
28 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 ...
0
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0answers
22 views

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

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.)
0
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1answer
2k views

scp ssh: connect to host 10.0.0.109 port 22: No route to host lost connection

I use SCP command on Debian Linux to transfer a file to my colleague via LAN. But I encounter the problem: $ scp filename.file username@10.0.0.109:/tmp ssh: connect to host 10.0.0.109 port 22: No ...
0
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0answers
31 views

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

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 ...
0
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1answer
25 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 ...
0
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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 [on hold]

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 ...
0
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1answer
22 views

Why do I have more packets than bytes? [on hold]

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:...
7
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4answers
669 views

OpenSSH - map aliases in ~/.ssh/config to IP addresses in command line

Is it possible to query ~/.ssh/config in the command line? Let's say I would like to retrieve what IP address does the particular alias point to in a separate program, is it possible?
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3answers
2k views

tcpdump doesn't appear to be capturing any data, why?

I'm trying to capture data with tcpdump like so: $ sudo tcpdump -Xi eth0 I have the device and the PC connected to each other. On both sides I launch a simple test application that sends a message ...
3
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0answers
34 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 ...
1
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3answers
50 views

Lost in the world of VPN

The Q. If i have a server, is it possible to have that server with a VPN connection, while simultaneously having an entirely separate connection to be able to SSH to from client machine. The Why. I ...
4
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1answer
74 views

How can I know which IP address of a host is reachable from another?

I don't particularly need a "solution" to something, I'd just like to understand more of the landscape here. So on my CentOS box, I installed a CentOS VM specifically for learning Puppet. When the ...
3
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2answers
1k views

Wait for a network device to come up before bringing another network device up on boot?

I'm in the middle of setting up my Raspberry Pi running Raspbian as a bridge between my university's wireless network (which requires WPA2-Enterprise authentication) and my private wireless router (...
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0answers
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 ...
0
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2answers
858 views

two NICs in the same subnet— need to set up routing

I have a tricky case: +---+ +----+ |D1 +->eth0---------<-eth0-+D2 | | | | | | +->eth1---------<-eth1-+ | +---+ +--...
0
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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 ...
0
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0answers
19 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 ...
0
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1answer
14 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 ...
0
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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 ...
0
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0answers
17 views

Apt-get update/update manager downloading slow [on hold]

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 ...
0
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0answers
31 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/?...
4
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1answer
3k views

Networking and Samba from a quest OS running on qemu

I'm trying to test some software on a big endian system to ensure compatibility. My plan is to use qemu on Ubuntu 12.04 to emulate a MIPS system. So far I've been able to create the quest system ...
5
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3answers
6k views

Cannot access to web server, but can ssh to it

I have a Ubuntu server but there are some weird things I can't understand. I cannot ping to the server via IP address, but I can ssh to it. I can access to apache server inside the server via command ...
21
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3answers
14k views

Limit outgoing bandwidth on an specific interface

I would like to know the easiest way to limit outgoing bandwidth for an interface. I want to cap the outgoing port speed so that file transfers between my servers don't fail during busy hours. What's ...
1
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1answer
43 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 ...
1
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1answer
1k views

cannot ping my computer on local network

I am running on 64 bit OpenSuSe 13.2 with Gnome 3 desktop environment and unsuccessfully trying to set up Samba Server. I have another computer running windows 8.1 from which I am pinging the ip ...
1
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3answers
48 views

Dnsmasq points nonexistent subdomains point to local IP

There's a specific remote subdomain mymachine.home.com whose the IP changes on all the time that I need to update DNSMasq to have it resolve correctly. But I tested pinging xxxxxx.home.com which ...
0
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1answer
20 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 \ -...
0
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1answer
812 views

SSH to Linux Container from Other Machine

I am trying to learn about Linux Containers and this is my first encounter with servers, ssh and many other things that I do not know the terms yet. I create five different containers and authorized ...
1
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1answer
41 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 ...
0
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1answer
2k views

Laptop connected to wifi but no internet

For some reason my wifi has decided to stop working. I can connect to APs, I can have excellent signal strength, but I can't actually load any web pages or ping anything. I know it's my laptop because ...
1
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0answers
23 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 ...
0
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1answer
27 views

Bonding on centos

I have host that running OpenStack. For public access, there bonding (mode active/passive) on nic1 and nic2. Right now both connect at the same switch. Is it possible to connect different switch and ...
1
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1answer
19 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 ...
0
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1answer
812 views

Set persistent static routes for 4 interfaces on 2 CentOS 7.1 servers

I am tasked to set up two test servers running CentOS 7.1 (Minimal install; the NetworkManager is disabled on both), and have run into a set of issues that I would like to get help here. The ...
7
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2answers
998 views

AP randomly gets unreachable for the clients while hostapd is running

I set up an old PC as a router using Debian Wheezy, hostapd, dhcpd etc. It has 3 NICs and 1 WiFi PCI card (TP-Link L-WN751ND). The problem is that AP randomly gets unreachable for the clients while ...
0
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2answers
1k views

Route wlan0 to openVPN tunnel and rest to eth0

I'm having problems to create route/iptables rules for following configuration: I have an openVPN server (tun type) running on my raspberry machine at home At work i have company pc (behind proxy) ...
0
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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 ...