Managing and using network connectivity on a unix system

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5
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2answers
315 views

Elementary OS shows WiFi networks, but won't connect

In the top bar, clicking the network icon shows a list of networks. My school's network, which on Windows I would connect to, and then visit a login page in Chrome in order for it to work, shows on ...
2
votes
1answer
40 views

how to overcome conflict between 2 network cards - virtualbox ubuntu

I am running ubuntu 10.4.04 LTS as guest in virtualbox on OSX Yosemite. Unfortunatelly I seem to have the network configured wrong I followed this tutorials ...
9
votes
3answers
4k views

Can't access select https sites on Linux over PPPoE

My internet connection used to be a direct LAN connection to my provider. Back then, everything would load fine on both Windows and Ubuntu (dual boot). However, a while ago they started needing me to ...
4
votes
2answers
296 views

Send traffic to self over physical network on Ubuntu

I have a dual port ethernet NIC and let's say I have connected both ports in a loop and assigned the following IPs to the 2 ethernet interfaces: eth2 -> 192.168.2.1 eth3 -> 192.168.3.1 I want to ...
1
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1answer
40 views

Bonding two interfaces

I'm trying to simulate bonding between two interfaces eth0 and eth1. So basicly, I need these two interfaces to be on the same subnet. My question here is: How can I achieve this?
2
votes
1answer
39 views

Addresses overlaps

I was putting somes static addresses to my interfaces then it shows me this: 172.16.1.0 overlaps with FastEthernet 0/0 What does it mean when two addresses overlaps and how can we avoid it? EDIT: ...
2
votes
2answers
453 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 ...
1
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0answers
43 views

Linux - iptables - get YouTube streaming bytes usage

How do I get bytes usage using iptables for a particular IP, including YouTube streaming videos? Currently, I am using the following IP tables rules to get data usage by IP address: sudo iptables -I ...
3
votes
1answer
54 views

I can't ping my bond interface when simulating 2 WAN connections

I'm actually simulating 2 WANs connexions with Wanem (each one on a different VM), those are connected to my servers. What I need to do here is to create a bonding to improve my bandwidth. I've ...
11
votes
5answers
8k views

How to recover a shell after a disconnection

Am doing some work on a remote centos 5.6 machine and my network keeps dropping. Is there a way i can recover my hung sessions after i reconnect? EDIT: am doing some updating and installing with yum ...
1
vote
1answer
58 views

traceroute / mtr from multiple locations, How can we do it ? (Or alternate way)

I have a website, recently due to some network issue, Most of my customers are reporting slow loading time of my website. When I reported this to my DataCenter, they are asking me to send the ping / ...
0
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2answers
29 views

Unable to connect to certain IP address, but able to connect to other IP in same subnet

I'm running a 14.04.2 LTS ubuntu box in a DMZ with IP of 10.10.30.35 and I have the following network mystery. I'm trying to connect to another unix box outside the DMZ but in our internal network at ...
6
votes
3answers
7k views

ssh from host to guest using qemu

How do I setup ssh from the host to the guest using qemu? I am able to use port redirection when I boot the VM without any special parameters, as follows: /usr/bin/qemu-system-x86_64 -hda ubuntu1204 ...
1
vote
1answer
36 views

Unable to access another server over local network on Digital Ocean

I have two servers. Let's call them A and B. Both are running ubuntu server 14.04. B runs percona server. Now I do not have any firewall set-up on either servers still I am unable to connect to server ...
4
votes
1answer
104 views

SSH server listening on multiple ports with passwordless access not allowing connections to second port

I have my Synology NAS running an SSH server listening on the default port 22 and I set up passwordless authentication with a public/private key and a passphrase: From sshd_config: ...
0
votes
1answer
17 views

What happens to TCP when a write fails to enqueue with the device tx ring?

Lets say the device tx ring is full and you do a normal C non blocking write(fd, buff) to enqueue data in the TCP SND buffer. What happens when this fails? In UDP - the packet would be dropped but ...
6
votes
1answer
168 views

In Archlinux, it has a valid ip, but no connection could established

Later I changed a wireless router, and everything goes OK. Maybe there were something incompatible between the former one and the latter. Yet I can't get the reason. ...
0
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0answers
28 views

URXVT network issues

So yeah. Whenever I maximize URXVT my friend's computer's League of Legends client, while in-game, latency goes up to around 3,000. Wireshark, ntop and tcpdump do not reveal any outgoing packets ...
0
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0answers
18 views

How much of Linux's recent TCP bufferbloat remediation also applies to SCTP?

I am looking at rebuilding an existing communications sub-system within a shared-nothing cluster. The current message protocol is built on UDP but layers on reliable, in-order delivery and ...
1
vote
1answer
37 views

Sharing the loopback interface across network namespaces

I'm interested in using a separate namespace for running a VPN client, so that every process I run into that namespace accesses the Internet through the VPN. That part I've managed to accomplish. ...
5
votes
3answers
22k views

how to ping & use specific network card

i have 3 network cards , 1 Lan (wired) , 1 wireless network card & 1 is wireless usb how do i ping from specific network card ? & how do i use specific network card for specific ...
2
votes
3answers
2k views

No route to host after upgrade to Fedora 19

I recently upgraded a system from Fedora 17 to 19. Now, I am not able to connect to any service other than ssh (perhaps a few others may be available but not sure) on it. Earlier this was not a ...
1
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0answers
32 views

Get Debian Wheezy netinstall to detect wlan

I'm attempting to install debian wheezy from the netinstall iso burned to usb. I'm trying to use a Belkin F9L1002v1. First time I attempted installation, I was notified of some missing firmware, so I ...
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0answers
62 views

Running a systemd service file after the network is up to bypass an OpenVPN default gateway

I would like to add a static route using a systemd service file on system boot. I have a DMZ network on a separate 192.168 class C network reachable via my default gateway. I also use OpenVPN to ...
3
votes
2answers
32k views

How to properly set up 2 network interfaces in CentOS (running in VirtualBox)?

I have a VirtualBox machine running CentOS 6.5. I've created 2 network adapters for it in VirtualBox's networking settings for the machine. The first is NAT which I want the guest to use to connect to ...
0
votes
1answer
37 views

What does “network interface” mean in /etc/network/interfaces, ifconfig and iwconfig?

/etc/network/interfaces is a file configuring network interfaces, and ifconfig and iwconfig are commands operating on network interfaces. I saw the logical name for a network interface they use can ...
0
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0answers
21 views

Snort alerts analysis (web interface)

I have a question about Snort (or maybe any other IDS/IPS, any working solutions would be ok). The goal is to set up some web interface providing a way to view the whole TCP stream packets of each ...
1
vote
2answers
50 views

How can I bring up up a non-boot (ONBOOT=no) network interface with iproute2?

Have a network interface that does not come up on boot-up: [belminf@tito ~]$ grep ONBOOT /etc/sysconfig/network-scripts/ifcfg-enp0s3 ONBOOT=no I know I could do the following for DHCP: ...
1
vote
2answers
168 views

Linux lock down route to avoid changes to the default route

I have a problem that every time I connect my Android phone with USB tethering it hijacks my computer's internet connection. Even if the phone's WIFI is off. I try to manually remove the default ...
1
vote
1answer
85 views

ifconfig not showing ip address under eth0

Usually when I connect my raspberry pi to my laptop using an ethernet cable, the ifconfig command in each computer would show the ipaddress of each computer under eth0. I recently got a new raspberry ...
1
vote
1answer
208 views

ubuntu 13.04 wifi lost connection - how to get it work again? (broadcom4313)

I am new to ubuntu, meaning I have a lack of funded knowledge and skills, but I hope I provide any necessary information you need to know for solving the problem. My problem is that I moved to a new ...
0
votes
1answer
31 views

SUSE 12 setting up virtual network interface

I'm struggling to setup virtual eth interface on Suse 12 When I run: ipconfig eth0:1 10.0.0.2 netmask 255.255.255.0 Output from ifconfig is as expected: eth0 Link encap:Ethernet HWaddr ...
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0answers
24 views

List all layer 3 protocols available in my system?

I am studying the OSI model and I have some doubts. How do I list layer 3 (OSI) protocols available/running in my system? Can I monitor them? Can I access to them (other than IP) from an programming ...
1
vote
1answer
27 views

how to use tc with htb on arch-linux

I'm trying to use this tc script on my arch box. Specifically, the first line, roughly equal to tc qdisc add dev eth0 root handle 1: htb default 3 fails with RTNETLINK answers: Operation not ...
0
votes
1answer
78 views

-bash: auto: command not found

I'm going to config my network interfaces and run this command: auto eth0 but it returns -bash: auto: command not found. It seems I've missed something which I don't know. Any idea? What should I ...
1
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0answers
25 views

Change of Network Interface using Metrics

I want to achieve dynamic interface change between eth0 and wlan0, one solution I am looking into is to change interface metric. Different than this question, I don't want to make any change to ...
3
votes
2answers
373 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
34 views

How to find bandwidth usage/bytes transmitted/received within a certain time frame

I'm looking for a way to get numbers on bandwidth usage of an eth port. But I need to filter the results to only show me numbers for the last 24 hours. Or any time period in hours or minutes. Just ...
1
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0answers
35 views

Route wireless LAN through OpenVPN

I am trying to set up my home server to act as an OpenVPN gateway so I can connect to my VPN from any device without installing special software of them. My server is running Ubuntu 14.04. The host ...
2
votes
1answer
89 views

How to properly configure DNS . . . from a conceptual perspective

I'm not looking for actual tools or techical how to type answers here. I'm in a complex networking environment, and I'm trying to understand the constraints on my choice of a hostname / domain / DNS ...
0
votes
2answers
49 views

Connection Timeout for ssh connection depending to the ip location?

I have a machine where I can connect it using ssh from different networks. But when I have moved to other country I have not be able to connect it. What may be the cause? I am able to ping the server ...
0
votes
1answer
52 views

Local system doesn't forward to intended port defined in OpenShift proxy app

I've set up a proxy server via OpenShift based on this tutorial and used a few days by forwarding my local system's ports to remote app's ports: $ rhc port-forward AppName The result in the proper ...
1
vote
1answer
124 views

Plain Bridge vs. Open vSwitch

Is there any performance benefit in using Open vSwitch over a plain bridge?
2
votes
1answer
34 views

Are there any loopholes in IP restricting sshd?

Say that i want to only allow username/password logins on my private network, but restrict all external sources on to key/cert login. I would do something like this: RSAAuthentication yes ...
3
votes
3answers
188 views

How do you prevent a DHCP release during shutdown?

I am currently using Ubuntu 14.04, but expect this to be applicable for different distros. I would like to prevent a DHCP release during shutdown, and opt for either the lease to expire or for a DHCP ...
0
votes
0answers
27 views

ssh_exchange_identification: read: Connection reset by peer (Have access to the server)

I'm getting "ssh_exchange_identification: read: Connection reset by peer" for ssh into a machine. However, it only happens to my machine and it works for the other person next to me (we share the same ...
0
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0answers
29 views

command line tool group chat utility under linux

I am working on mac osx Yosemite. I want to reach to a user under a certain IP address. (It might be local network or thru internet). I want to do it thru terminal using the default tools that ...
3
votes
0answers
27 views

Is there a thing like “veth”, but without link-level headers?

When I use separate network namespace, I often set up networking there using veth: ip link add type veth ip link set veth0 netns 1 ifconfig veth1 192.168.60.2 ip route add default via 192.168.60.1 ...
15
votes
6answers
5k views

What is using this network socket?

I'm trying to use NTP to update the time on my machine. However, it gives me an error: host # ntpdate ntp1.example.org 10 Aug 12:38:50 ntpdate[7696]: the NTP socket is in use, exiting What does the ...
2
votes
0answers
345 views

What does `NO-CARRIER` and `DOWN` mean for a wireless interface?

I have a remote server and I log output of certain commands while the server cannot access the internet. It uses a wireless interface to connect to the internet. In a working state the output of ...