Managing and using network connectivity on a unix system

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28 views

Log if no network

I have a router with OpenWRT. I noticed that sometimes (during night time) I have no internet connection. How can I log when this happens?
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73 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 ...
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150 views

Linux - Only first virtual interface can ping external gateway

I created 3 virtual interfaces with different MAC addresses all linked to the same physical interface. I see that they can successfully arp for the gateway (gw) and they can ping (the request is ...
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237 views

Difference between txqueuelen and ethtool tx

What's the difference between the txqueuelen setting that can be applied with either: ifconfig eth4 txqueuelen 5000 ip link set eth4 txqueuelen 5000 And the tx ring size setting that can be applied ...
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100 views

AIX NIM Master replicate / sync fails to an Alternate Master

I am getting a error when I try to replicate / sync my NIM database and resources to an Alternate NIM Master newly created in my environment: error replicating resources: unable to ...
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165 views

Creating a private network for internal VMs

I am trying to configure a private network for use with my Xen VMs, in addition to the public network in use by another of the VMs (VM1, which has its own public IP). So far, I have the public side ...
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371 views

What do I need to add a virtual IPsec adapter?

I'm trying to set up an IPsec connection manually from the console with iproute2. What I need is a virtual interface (at best, a virtual IP address could also be sufficient) that IPsec-transforms ...
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32 views

Queuing disciplines are per-interface, what happen with interfaces using same device?

I have read about queuing disciplines here http://lartc.org/. I understand that for instance band 0 of pfifo policy is prioritized over band 2 within same qdisc, but what happen when i have ppp0 and ...
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117 views

To what extent does LXC manage configuring the network interface in a container?

In the LXC config file we can specify an IP address for a container: lxc.network.type=veth lxc.network.link=br0 lxc.network.ipv4 = 10.1.0.35/16 lxc.network.flags=up lxc.network.hwaddr= ...
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848 views

I can SSH and HTTP, but not ping or access particular UDP services over my LAN

So I've encountered a weird problem when trying to set up a Linux server running a variant of CRUX Linux. I am trying to configure it to be a Teamspeak server, but no clients can connect. The ...
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667 views

tunneling FON traffic via Tor

I would like to tunnel the traffic of my FON router through Tor. For that I added a second network card to a local server and connected the FON router to it. Then I set up a DHCP server and configured ...
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591 views

Wireless rtl8187 freezes intermittently

I am using a wireless USB ALFA 036H. Linux Mint (32-bit) recognizes it without any drivers but it stops downloading/uploading and I have to reconnect to get it to work again. I tried to find a ...
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15 views

Assign Special Records for specific remote clients DNSmasq

I'd like to make DNSmasq serve special records for specific remote clients (Clients from the public internet) So for example if remote host 111.111.111.111 requests www.example.com it returns 3.3.3.3 ...
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20 views

Want to assign dedicated default gateway on Two NIC card on linux server

We have one server having two nic cards. Here we configured two separate networks on both nics and having different gateway. However our one sub-net is able to communicate to outside network second ...
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46 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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34 views

reset Ethernet bonding without rebooting

I have the following Ethernet bonding configuration: old configuration: bond0 eth0 eth1 bond1 eth2 eth3 new configuration : bond0 eth0 eth2 bond1 eth1 eth3 I have made the ...
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31 views

How to set up networking on a per-user basis?

I would like to set up access to corporate VPN for just my user account on my computer; not for the other accounts and certainly not for the guest user. To achieve this, I presume, I need to ...
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31 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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221 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 ...
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117 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 ...
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40 views

AppArmor Profile: Deny internet access

I want to deny the internet permission for some applications. Therefore, I tried first to deny the internet permission for ping, but it doesn't work. Here is the profile of /etc/apparmor.d/bin.ping ...
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63 views

Use eth0 and eth1 for different subnets and assigned host name to interface?

I have a machine running SELES 10 with dual NIC Both the NICs are on separate subnets. The server uses a DHCP. So when one interface, eth0, gets the IP from DHCP and registers with DNS and then the ...
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54 views

Configure routes to access WAN and LAN through diffrent interfaces

In my organization. Some useful technical websites are blocked by the firewall. In my machine i got three interfaces eth0, wlan0, wwlan0 eth0 Link encap:Ethernet HWaddr 00:9c:02:93:b1:b4 ...
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36 views

Confusing my IP stack

At work, I have an Oracle GRID/RAC cluster of two hosts, including Oracle's SCAN functionality. Picking one host: eth0 is the management port on 169.254.10.25. eth1, eth2, and eth3 comprise bondeth0 ...
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35 views

iptables drop length and TTL condition doesn't work

With iptables utility on Linux host need to create mini firewall. I need to drop all incoming connections with package length greater than 722 AND TTL greater than 22. Need exactly AND. Drop only if ...
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76 views

sctp traffic generator

I'm looking for a free SCTP/TCAP traffic generator (specially for MAP, Camel and INAP protocols). I need to build some message flow scenario and generate load in order to test some application Thanks ...
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24 views

Manually adding static ip not resolved after a while

Hi Unix/Linux community, I have a small problem with a device I am connecting to my laptop, running Debian Linux. While connected to a router on my wlan1 interface (using wicd, if that matters), I am ...
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179 views

DHCP lease acquired , yet no ping, not even to default gateway

I've just installed Debian Wheezy on my PC using netinstall. I can only use its wifi. My interface has been recognize by the system, and I've used: iwconfig wlan0 essid MY_HOME_AP (I've switched ...
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98 views

CentOS 5.5 server dropping & blocking connection

I'm running a CentOS release 5.5 (Final) server running the LAMP stack amongst other things. When working on a web project with numerous active connections to the server box (Plesk over HTTP, SSH and ...
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153 views

Find hostapd's access point SSID

I have a Linux machine operating as an access point using hostapd and dnsmasq. The AP is working fine (the device is wlan0), but I am having difficulty finding the SSID of the AP for monitoring ...
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80 views

RNDIS Server to make a computer as a peripheral

First of all my goal is this, have a computer as a peripheral device to connect it to anyone's computer with ssh protocol or web. The idea is doing this by using a plug and play USB cable . Facts ...
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86 views

Raspbian: how ifplugd works on lo and other interface

On my raspbian, I'm wondering why ifplugd (link detection daemon for ethernet devices) is also running on the lo the loopback interface. The ps command displays: /usr/sbin/ifplugd -i lo -q -f -u0 ...
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196 views

Broadcom or Modem wireless connection problem

I have a BMC42142 wireless adaptor lspci -vnn | grep 14e4: 02:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01) and I can't connect to the wireless ...
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257 views

Rogue AP channel hopping problem

I am able to set AP but despite explicitly setting channel for monitor interface and AP, AP frequency changes regularly. My setup: OS: Kali Linux 1.0 (booted from a USB stick) External network ...
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214 views

iptables REDIRECT in combination with matching on interface vs. IP address

I've successfully set up Tor for transparent proxying using iptables (ie, all outgoing traffic is sent through Tor without the application's knowledge). In doing so, I discovered both an odd problem ...
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135 views

Check via Shell-script if server currently streams via dlna

Currently I'm running uShare to stream videos from my home-server via DLNA to the TV. On the server there is also running a bash-script which checks if a user is connected via ssh or Samba. If this is ...
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0answers
166 views

Network block after restart

I'm running wheezy and I don't want to install network-manager. I have a problem with network interfaces. When I restart the interfaces I cannot use any connection anymore. I cannot reach internet ...
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0answers
578 views

Adding multiple gateways for separate physical interfaces with various metrics/priorities

My system has 3 interfaces. These are eth0, eth1 and usb0. eth0 is linked to my router and is the line I want to be used by default. eth1 is un used. usb0 is a 3G phone that's tethered. My issue is ...
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197 views

Mint changes default route when eth0 comes back and breaks existing tcp connections

I have two interfaces on my laptop (eth0, wlan0). lets say I am moving away from desk and connecting to an internal network A using openvpn software which uses wlan0 as gateway. I then ssh to a few ...
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0answers
172 views

B.A.T.M.A.N. working with cable, not with wireless

I'm creating a mesh network with B.A.T.M.A.N.. The version is 2011.4.0 in host A, 2012.3.0 in host B. I've setup the network as explained here. I can ping bat0 interfaces if the connection is done ...
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0answers
439 views

CUPS can't print to printer on network

I am having problems printing to the printer connected to my (SBS2003) business's network. I know the IP of the printer and I can ping it and even print files from it by going to 192.168.0.50 in ...
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0answers
132 views

Bonds vs. Aggregators

I'm almost to the point where I can post the solution I wound up with for my complex port bonding question. However, in reading the bonding.txt file, I see this option text: ad_select Specifies the ...
2
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0answers
193 views

Windows shared network printer keeps using rear tray as source

I am trying to set up network printing on my Linux Mint 15 (64 bit) system (dualboot with Windows 7). The printer is a Canon PIXMA MG5100 and is connected (via USB) to a computer running Windows XP. ...
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0answers
282 views

Openswan ipsec hub and spoke setup is not working

I have configured Hub and Spoke using openswan ipsec. Tunnel is immediately getting UP but the problem is: Spoke1 can ping/access HUB's LAN and vice-versa (S1 -- HUB && HUB -- S1) Spoke2 can ...
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0answers
310 views

How to setup networking for Linux Mint - VM when host machine uses a PAC file

My host is a Windows 7 x64 machine. The office network uses a PAC file for the LAN settings. So, under Internet Options -> Connections -> LAN Settings, I have Use automatic configuration script with ...
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624 views

Ubuntu : after upgrade, wire network is unstable

Yesterday I have upgraded to Ubuntu 13.04. After I upgrade, I have a serious problem with network (I use wire network): my network is unstable. After a short time using it, it often disconnects. It ...
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61 views

How to specify which interface an application uses?

Imagine this example: you have direct access to the internet on eth0, and you have a VPN on tun0. You want one application to access the internet directly through eth0 (using X public IP address) and ...
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585 views

ping receives no packets, but tcpdump can see them coming in

I'm migrating an old Ubuntu OpenVZ instance (Jaunty) to a new CentOS 6.3 host (using vzdump/vzrestore). Now networking does not work properly. Facts: It works just fine if a setup a new OpenVZ ...
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121 views

Trying to install DIP (Dialup Networking) package for SLIP protocol

We are trying to interface with a wireless modem that connects to a computer via a com-port DB-9 connection. It uses SLIP in the sense that the modem hosts a SLIP server and requires the interfacing ...
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272 views

Failed to execute shell script from “network” udev rule to change the MAC-address

I am trying to execute a shell script from udev rule, when a network interface is added, as follows: SUBSYSTEM=="net", ACTION=="add", KERNEL=="eth*", PROGRAM="/usr/local/bin/changemac.sh", ...