0
votes
0answers
40 views

Why might debian become unresponsive with virtually 0% CPU usage? [on hold]

We have a problem with one of our (virtual) Debian servers failing in a strange way. The server will stop responding to to the network (no SSH, no Ping response, no app response). The only way we ...
1
vote
0answers
31 views

Is it possible to prevent eth0 network traffic from accessing eth1 network?

I am not really sure how this is possible but I have a linux(ubuntu 14.04) box with 2 interfaces. eth0 is connected to our lan 192.168.0.* and eth1 is connected to a dlink wifi router on network ...
1
vote
2answers
46 views

How to troubleshooting failing ping to router on a linux box?

I have a home network 192.168.0.x from which I am posting this message, on this network I have a CentOS7 host 192.168.0.3 which is running a DNS server for the network. I can ssh into 192.168.0.3 I ...
2
votes
1answer
11 views

Where do I find the OID descriptions for SNMPv2 in Linux?

I was looking at this link here: http://www.debianadmin.com/linux-snmp-oids-for-cpumemory-and-disk-statistics.html and noticed that the OIDs are the same ones I see for the same stats for our ...
1
vote
1answer
22 views

Cannot ping machine on eth0; Pings fine on wlan0; Centos 6.5 on Dell D610

I recently installed Centos 6.5 (32 bit) on an old Dell D610. It has both a lan port and a wifi. When I assign the wifi a static IP, I can use it as a server, connect to it from other machines etc ...
1
vote
0answers
33 views

How to find all available networking interfaces, having IP address assigned or not [migrated]

I am trying to get all networking interfaces available on linux. I am using ioctl API to get all the networking interfaces but it return me only the interfaces those have ip address allocated. It ...
1
vote
1answer
35 views

Unable to access an http sevice forwarded using ssh

I forwarded a port from a remote server (which has Tomcat running on it) to a local port on my machine. Say, if the remote server address is http://myremoteserver.com:8080, I forwarded the port to ...
1
vote
3answers
76 views

Network statistics on linux

I am trying to write a small script to gather network statistics on my Linux system. Is there any way I can do this? What I'm after is live stats on current network throughput. I have done some ...
0
votes
0answers
22 views

How can I use 0.0.0.0/0 in ipset hash:net,port?

Right now, if I do ipset a ansible_allowed 0.0.0.0/0,tcp:22 I get ipset v6.19: The value of the CIDR parameter of the IP address is invalid and instead I have to add 0.0.0.0/1,tcp:22 ...
0
votes
1answer
20 views

home-built router - slow throughput

I am having slow performance with my home-built router. Compared to a stock Verizon (actiontec) router, it gets about 60 Mpbs down and 30 Mpbs up whereas I get about 15 Mbps and 20 Mbps up. I ...
1
vote
1answer
757 views

Fedora 20: Failed to start LSB: Bring up/down networking

I'm trying to restart my networking service in Fedora 20, and I get the following error: [dev@localhost das]$ sudo service network restart [sudo] password for dev: Restarting network (via ...
2
votes
0answers
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 ...
0
votes
2answers
70 views

Debian VLAN (8021q) Configuration doesn't work

I try to setup VLANs on a virtual Debian machine. It's connected to an Cisco 2960 Switch. The Switch has 3 VLANs (1,100,200) which're allowed the pass the trunk. The Switch Configurations was tested ...
1
vote
1answer
26 views

Naming PPP interfaces

I have two PPP peers, dsl-line1 and dsl-line2 which are configured with pppd on Ubuntu (Server) Linux. They are brought up by the /etc/network/interfaces file with the auto thingy however each PPP ...
4
votes
1answer
391 views

ifconfig command not found

I've just installed CentOS7 as a virtual machine on my mac (osx10.9.3 + virtualbox) .Running ifconfig returns command not found. Also running sudo /sbin/ifconfig returns commmand not found. I am root. ...
0
votes
0answers
37 views

Cannot connect to wired ethernet after hibernate

When I am at home I use wired connection on my laptop and it works fine. Then I put it to hibernate with sudo pm-hibernate and start it up again when I am work. I am not able to connect to internet ...
2
votes
1answer
42 views

Traffic segmentation for a particular subnet

Two questions is it possible to segment traffic for a particular subnet to use an interface and at the same time receive traffic from a different subnet via the same interface? This is the scenario. ...
-1
votes
1answer
48 views

How to control network bandwidth using Linux [closed]

Currently my Internet is really slow. But I want to allocate all resources to a browser that is loading a movie. How do I do that?
2
votes
0answers
29 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. ...
4
votes
2answers
103 views

Preprocess packets send to/from interface

Is it somehow possible to intercept packet data just before it reaches an interface, and just after it is received? E.g. preprocess it and send it back on its way? I wanted to create a custom ...
3
votes
1answer
82 views

How to tell if two ethernet interfaces are on the same lan?

I have to secure interfaces on Linux servers by setting bonding interfaces. The cabling information is not accurate. Is there a simple way to know if two interfaces are connected to the same LAN? ...
1
vote
1answer
45 views

masscan. how to configure Linux?

I've set this in my sysctl.conf: net.netfilter.nf_conntrack_max=268435456 Because, this border 16,777,216 achieved very quick. Also, I've decrease timeouts: net.ipv4.tcp_fin_timeout = 30 ...
2
votes
1answer
105 views

set ip default outgoing in centos

I have server which has Centos and I want to change the outgoing IP address. This is the output of my route and route list commands. [root@marketport tmp]# route -n Kernel IP routing table ...
0
votes
0answers
19 views

lost packets using traceroute

using mytraceroute I see 50% of ICMP echo request lost: 192.168.1.212 is internal server while 192.168.5.1 is my router: Host Loss% Snt Last Avg ...
1
vote
2answers
297 views

eth0 not installed on CentOS

How would I go about installing eth0 on CentOS? When I do ifconfig -a, eth0 is not there. Here is the output of ip link: 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue link/loopback ...
0
votes
0answers
9 views

CentOS Run Command as Root on Startup [duplicate]

I need to designate my network card device p4p1 with a certain IP address on startup. The command I am using is as follows : /sbin/ip addr add 129.100.14.2/24 dev p4p1 this works from the command ...
3
votes
3answers
58 views

linux interface to get connected IPs

Is there an interface to get the currently connected IPs and their state in Linux? I am aware of ss and netstat, but I want to use /proc/ or some other "official" kernel interface that already has ...
1
vote
1answer
47 views

LVS is not accessible from the outside

I'm currently busy setting up a LVS - Linux Virtual Server: root@debian1:~# ipvsadm -L IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port ...
2
votes
0answers
95 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 ...
1
vote
0answers
31 views

Setting up traffic for GRE Tunnel

I want to set up clients that are behind NAT with a public IP but allow them to have one or more public IP's on their device. The idea is to have a linux box with either 1 or two network cards. Lets ...
1
vote
1answer
36 views

DHCP Problems Virtualbox

I have some minor issues with Ubuntu server on a virtual machine and even though I have some assumptions as to what actually happens, I'd like to ask all of you about your opinion. Here's the deal: I ...
2
votes
0answers
59 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 ...
1
vote
1answer
54 views

How do you route to secondary interface on the same physical port?

INTERNET<->(wan)BRIDGED_DEVICE(lan)<->ETH_ROUTER<->LAN Problem: Need to access web server on BRIDGED_DEVICE's LAN from INTERNET via ROUTER (BRIDGED_DEVICE web server cannot be accessed form ...
3
votes
0answers
119 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 ...
1
vote
1answer
14 views

what happens during nic master failover?

During NIC master failover, will the mac address of bond0 change?
4
votes
1answer
31 views

How do you ensure physical network interfaces always get the same interface name across reboots on an embedded Linux system?

For an embedded Linux system, if I have two or more network interfaces, how do I ensure that they always get the same interface names every boot In other words, I want, for example, eth0 to always ...
0
votes
1answer
55 views

Setting up a static IP. Please can someone explain the process

I have just installed Linux Fedora 20 on my laptop; I have it already on my main home computer. I maintain a number of files, mostly my own notes, hints and reminders about how to do things, that I ...
0
votes
3answers
224 views

Telnet on Linux Server

I want to know if it is necessary to have telnet enabled on both sides of machines to get telnet connection. Here's the issue: I am trying to telnet some public IP on port 80 from a Linux web server ...
0
votes
2answers
161 views

Unable to telnet public ip on port 80

We are facing a communication problem between the public and our private network. We have a Linux based web server behind a firewall and an internet router. As part of some integration, our web portal ...
2
votes
2answers
117 views

Primary network interface in Linux

I have a server box with two interfaces. One of the interfaces is connected to the internal network, another - to external. I have assigned IP 192.168.1.200 to internal interface (eth0). I have some ...
1
vote
1answer
57 views

Madwifi VAP (and wlanconfig) modern equivalent

It appears that the Madwifi project is deprecated, so I am curious if there is a replacement for the wlanconfig utility that allowed users create Virtual APs. I did search for wlanconfig in my package ...
2
votes
1answer
134 views

How configurable is MPTCP?

I work on embedded Linux devices that usually have hard wired Ethernet as well as cell modem connections. If I were to use MPTCP would it be possible to easily configure the system to use eth0 all ...
2
votes
1answer
165 views

WITHOUT using network command lines in linux, how to know list of open ports and the process that owns them?

I want to know which ports are used by which processes in embedded-linux. Since it is simple embedded-linux, there are no network command lines such as netstat, lsof. (only basic command lines such as ...
26
votes
2answers
2k views

Can TCP provide more than 65535 ports?

Is it possible to setup a Linux system so that it provides more than 65,535 ports? The intent would be to have more than 65k daemons listening on a given system. Clearly there are ports being used ...
1
vote
1answer
462 views

VNC Server without X Window System

Will a VNC server work without X Server installed? I know vnc works with X Server, but what about without it?
1
vote
1answer
198 views

Networking between two Virtual machines on different hosts

I have openSuse installed as a virtual machine(Oracle Virtual Box) on DeskTop(win 7), and another openSuse installed on as a virtual machine(Oracle Virtual Box) on my Laptop(win 8.1). Please see the ...
2
votes
0answers
34 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 ...
1
vote
0answers
34 views

How to run a specific TCP client with a different IP?

My server has 3 ips. I use cronjob doing some api job. But this api has some limit: 100 calls/day. So how can i set a special ip for running some special script via cronjob? Thanks. 0,20,40 * * * * ...
-2
votes
1answer
160 views

ifconfig shows only lo

I'm a beginner using Debian. I've just installed Debian 7.5.0 amd netinst. Actually I am trying to install the firmware through aptitude install firmware-linux-nonfree When I executed ifconfig and ...
0
votes
0answers
653 views

Help with Setting up network connection in Debian 7.5.0

I'm a beginner using Debian. I've just installed Debian 7.5.0 amd netinst. When I execute apt-get update I get errors like: Could not resolve 'http.debian.org' Thus I changed the mirrors several ...