A computer network allows sharing of resources and information among interconnected devices.

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2
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2answers
57 views

Detect open sockets manually (not using nc or similar)?

I'm trying to debug a network problem on a embedded system which has a very limited set of userspace applications. Meaning I can't use any of the following sudo lsof -i sudo netstat -lptu sudo ...
2
votes
1answer
44 views

OpenVZ: Many subdomains on a single IP for the VMs

Can I Use many sub domains that get assigned to OpenVZ containers with a single ip for a dedicated server? To elaborate further: I have one IP and one domain. I want to have two OpenVZ containers and ...
0
votes
2answers
131 views

Prevent Zypper trying to use IPv6

I'm setting up a box with OpenSUSE 13.1. For reasons beyond my comprehension, Zypper utterly insists on using IPv6 addresses and refuses to use IPv4. Which is a problem, since IPv6 doesn't work on our ...
2
votes
1answer
32 views

Where would additional IP addresses assigned to a NIC be configured on CentOS 4.4?

I have a very old CentOS 4.4 machine with multiple IP addresses assigned to eth0. However these ip addresses are not configured in /etc/sysconfig/network-scripts where I would expect them to be i.e. ...
3
votes
2answers
81 views

Exposing NFS mount via USB

I know enough linux to be dangerous - apologies if my terminology is incorrect. I have an electronic drumkit that has USB into which I can plug a flash drive with MP3s on it. The drumkit has no ...
0
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0answers
20 views

dhcpd on two network interface how to?

I have an embedded system that has Ethernet and wifi. I want to setit up in a way that it provides IP to both interfaces. The system uses BusyBox. and I an new in this area. can you provide a sample ...
2
votes
1answer
142 views

stunnel - how to setup stunnel to handle ssl and attach http with it?

I am running Google App Engine which is a http web server with some redirecting and other real-time stuff. But it does not have SSL to include so its unable to make HTTPS. Therefore, i was trying ...
0
votes
1answer
66 views

Multiple SSH tunnel through raspberry pi?

In my home network I have a PC, raspberry pi, macbook and a few other devices which I want to access away from home. As it stands, I have setup VNC server on my PC along with remote desktop and have ...
1
vote
0answers
85 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 ...
0
votes
1answer
62 views

Strange network problem (ssh) after hardware switch - packet loss?

My machine crashed (would not start) and so I pulled my harddrives and memory (which was not stock) and brought to another identical Dell optiplex 755 which I found in the office. Now everything seems ...
0
votes
0answers
76 views

Why can't my Debian received much wifi-signal

My wireless connection is always broken, and it can't receive good signal. I am not sure if the wireless driver caused it. Is my wireless driver too old? Or there are some other reasons? My mobile can ...
2
votes
1answer
103 views

iptables: redirect local request with NAT

I'd like to redirect local requests to port which is translated with NAT. I have following rules: iptables -t nat -A PREROUTING -p tcp --dport 9020 -j DNAT --to 10.0.3.11:80 however request coming ...
1
vote
1answer
133 views

ath9k 802.11n 300Mbps at low speed

I'm testing my new home 802.11n network. router - slax 7, kernel 3.8.2, AR9382 mini pci-e (sparklan WPEA-121N) wlan0 IEEE 802.11abgn ESSID:"xyz" Mode:Ad-Hoc Frequency:2.412 GHz ...
0
votes
0answers
50 views

Connecting BeagleBoard-xm OS Angstrom direct to Laptop ubuntu 12.04

I have BeagleBoard-xm with Angstrom OS. My Laptop's OS is Ubuntu 12.04. I managed to connect Laptop to another Laptop, direct through crossover cable. I wanted to connect BeagleBoard-xm to the ...
4
votes
1answer
42 views

allowing users to access certain ports on server

I have an RHEL 6 system which has 20 users. I have 20 ports on which separate versions of a service is running. I want user a to access port a, but not other ports. Is there a way to do this? ...
0
votes
1answer
180 views

What is the effect of rsync --block-size on large files?

I want to backup a few terabytes of large files (500mb to 1500mb each) to a backup server (BULK storage) via rsync. For this I use the following command (updated with suggestions from @Gilles): ...
2
votes
0answers
29 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 ...
0
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0answers
90 views

On ssh connection the auth.log shows as source IP the external IP of the server instead of the IP of the client

I have a very odd situation with my ssh connection. Every time I connect to my server, whatever is my external ip, the connection have as source the server's external ip. Example Server S.O.: ...
1
vote
1answer
57 views

How do I prevent my hostapd access point from pretending to route to the Internet?

I have a nice little iMX6 (an ARM CPU) board running Linux kernel 3.0.35 with hostapd 0.7.3. Setting up the wireless interface as an access point works fine but clients think they can be routed ...
1
vote
1answer
51 views

How to measure the time a packet spends on the system(router)?

I have a streaming system and one if its components is a router/firewall. I'm using iptables for setting the required behaviour on the router. I'm having performance issues in forms of a constant ...
0
votes
1answer
34 views

How to log into network in linux?

I am using a custom version of OpenWRT linux that is used as a dev enviroment for a a graphic library. I am using it as a Virtualbox image. The distro contains a proxy module that needs to access the ...
2
votes
1answer
54 views

Load Balancing among multiple virtual network interfaces

I have an AWS instance with multiple virtual network interfaces all having different elastic IPs. Since I crawl from this machine, the IPs often get blocked. Distributing the outgoing traffic through ...
0
votes
2answers
53 views

Syslog-ng failover: logserver to local file

We want to use a central Logserver for our Webservers so we can manage everyhing on one machhine. I'm a bit scared of what happens if the network breaks or the Logserver is down. Is it possible that ...
2
votes
1answer
242 views

How to permanently disable a network interface?

I've brought down a network interface with ifconfig wlan0 down, but every few hours or so, the wlan0 interface comes back up and I can't figure out why. I don't restart the machine, never changed ...
0
votes
1answer
46 views

Mount entry in fstab when connect to a network

I have an entry in fstab (Opensuse) which mounts a samba filesystem: //10.39.52.2/Company /media/share cifs credentials=/home/user/file,rw,nounix,iocharset=utf8,file_mode=0777,dir_mode=0777 0 0 but ...
0
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0answers
25 views

Routing Application through different network interfaces [duplicate]

I have two interfaces on a server, let's call them eth0 and eth1. The underlying server is running CentOS 6.5 I would like to be able for some application to use eht0 while some others use eth1. ...
1
vote
1answer
381 views

Lenovo ThinkPad s440 network

Does anybody know how to configure wifi on Lenovo ThinkPad s440 on Ubuntu 12.04 LTS? I can't configure it even with LAN. But anyway, wifi is the first thing I need. I can't find any driver for linux. ...
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vote
0answers
95 views

Understand the Route table

I just setup the OpenVPN and it is working as expected. However, the routing table of the client is confusing me to no end. Here is the route table: # route -n Kernel IP routing table Destination ...
1
vote
1answer
45 views

MAC Address changes after dirty shutdown

I'm having a strange issue which I originally thought was tied to the fact that I created an Ubuntu system from an image of another. However, after reinstalling Ubuntu from scratch I am getting the ...
1
vote
1answer
39 views

What priorities can be used in cgroups net_prio module?

Cgroups has a module called net_prio, and by using this module I can set the priority of network traffic generated by various applications. As you can read here, this can be achieved by setting ...
6
votes
1answer
271 views

Creating VLANs between network namespaces

I want to implement the topology shown in the figure below using network namespaces (ns1 to ns4). ...
3
votes
1answer
491 views

Cloned Linux system and /etc/udev/rules.d/70-persistent-net.rules

I set up an Ubuntu system and configured it properly, including defining eth0 in /etc/network/interfaces. I then imaged that system and cloned it on a new system. When I booted up the system the ...
1
vote
1answer
58 views

Why doesn't setuid on /sbin/dhclient work as intended?

I am the only user on my machine, and prefer not to type sudo every time I use dhclient. Therefore, I tried sudo chmod u+s /sbin/dhclient. However, when I subsequently run dhclient wlan0 from a ...
2
votes
2answers
104 views

ssldump: PCAP: syntax error

I'm using: # uname -ro FreeBSD 9.0-RELEASE-p3 And the latest ssldump: # pkg_info | grep ssldump ssldump-0.9b3_4 SSLv3/TLS network protocol analyzer When I try starting it with decryption - I ...
0
votes
0answers
19 views

PulseAudio: Avahi needs restart to work

I'm trying to setup my local server pulse audio to be accessible by my notebook's one. I have successfully set up the server to start one instance (the server one, everything wanrned me i should not ...
0
votes
1answer
106 views

kvm usb modem passthrough

I'm trying to set up a USB modem passthrough in kvm virt-manager. The host is Fedora 20. The guest is Centos 6 $ ifconfig wlp0s29u1u6: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether ...
0
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0answers
116 views

OpenSSH hangs after login without showing login prompt

I ran across an issue with ssh after fresh Ubuntu 13.10 installation on Lenovo T420. I tried git pull (which failed) and this led me to more general ssh failing. After spending some 2-3 hrs of ...
0
votes
1answer
50 views

netatalk use system users on Debian

I have Debian 7.3 (wheezy) installed on a VM with Mac OS X host. I didn't install UI like GNOME. Now I installed netatalk (via apt-get) to use AFP to connect my Mac to the VM. It essentially works ...
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votes
3answers
106 views

Configure eth1 to stop using dhcp [closed]

How do I configure eth1 (via terminal commands) to stop using DHCP. That is, if I had the ability to use the GUI, I would select the MANUAL setting.
0
votes
1answer
652 views

Ubuntu: how do you swap eth0 and eth1? (Ubuntu 13.10 server in a VirtualBox VM)

I installed Ubuntu 13.10 server (64-bit) in a VirtualBox 4.3.6 VM (Windows host) with one NAT adapter assigned. The only non-default software selected during installation was OpenSSH. So far so ...
0
votes
0answers
50 views

Postfix not responding to telnet

I am doing a Postfix installation on CentOS 6.5 I can't get # telnet localhost 25 to do more than this: Trying ::1... Connected to localhost. Escape character is '^]'. EHLO ^] telnet> quit ...
0
votes
1answer
44 views

IP Prefix - how do I declare this?

Hi I have an IP Prefix issue I would like to declare the following IP's as "safe" using ip prefix "methodology" ("?") The IP's first three parts of the IP have been doctored to protect the innocent, ...
2
votes
2answers
106 views

Shell script to wait for a packet from a certain port

I want to start my minecraft server when someone tries to connect to it on port 25565. I have a plugin for the server which shuts it down after x amount of minutes without players online. With a shell ...
3
votes
1answer
73 views

How can I know which program is sniffing packets?

I found the NIC of a machine is running in promiscuous mode, now how can I locate the program who is actually capturing packets?
2
votes
0answers
61 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 ...
2
votes
1answer
58 views

Understand netstat -i flgs

Can anyone explain for me what each option in Flg means? [root@apple ~]# netstat -i Kernel Interface table Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg eth0 ...
0
votes
0answers
27 views

Internet working but not all of LAN!

I have recently installed CentOS 6.5. system is behind a firewall (institutional access) with an IP address, say, 10.50.28.99. It is not detecting (pinging or connecting via ssh) computers with ...
2
votes
1answer
54 views

Internet sharing with iptables: choosing which connection to share

I have a computer with two network devices (eth0 and wlan0), both connected to the internet (two different connections/isp). I'm trying to share the connection of wlan0 to another computer connected ...
1
vote
1answer
35 views

Does my VM need to be on the same LAN IP range to ping?

I have a home LAN where all internal IP addresses are in the rang 192.169.0.0-254. However, on one of those computers I have setup a CentOS VM, which currently seems to be set to 10.0.2.1. So the VM ...
3
votes
0answers
75 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 ...