Managing and using network connectivity on a unix system

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Protection of peripheral and core network [closed]

What is the best way to protect core network and peripheral network? What are the best practices and technologies used in banking industry and healthcare industry?
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3answers
3k views

Split DNS (bind9), match-clients any doesn't work?

I've been fighting with this for the last few days. A few of my entries have external and internal IP's. My internal network is 10.0.0.0/8. When I nslookup pc1.clase.net internally it responds with ...
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2answers
599 views

Route everything through VPN except SSH on Port 22

I have a Server and I want to setup a VPN on it to route all traffic. Of course I dont want to block myself out when establishing the OpenVPN connection (already did that..) so I want the Port 22 to ...
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2answers
863 views

No Default Gateway route for bond0 / Slave eth* interface gets IP assigned

I have set up a 4-NIC bond on my Debian Wheezy box. After a fresh boot, the system has LAN access, but cannot resolve outside host names or access outside IPs. It seems that this is because the bond0 ...
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1answer
2k views

No IP address on VMware running centos 7

I just now installed Cent OS 7 on my VMware 8 and I am not able to connect it to a network. I checked the VM network and its mapped to the physical NIC. The same setting work like charm on my CentOS ...
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2answers
37 views

Force an application to use a specific connection

So my Mint 17 has 2 connections (wired and wireless) when both connected by default the wired is used, what I want to do is keep wireless for file download and general Internet usage, and use the ...
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4answers
44 views

How to know which ports are listened by certain PID?

I have a PID of certain process listening some port(s) on my OS X and I need to know which port(s) is listened by this process. How can I do it? I know I can use lsof to know which process is ...
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1answer
14 views

How can I find out the ownership of a tap interface?

I can set up a persistent Linux tap interface and make it owned by a specific user and group with one of these: tunctl -u someuser -g somegroup -t example.tap ip tuntap add dev example.tap mode tap ...
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26 views

multiple ip in an android payload(Kali linux)?

I'm using Kali linux 2.0 and I'm trying to make an android msfvenom payload that uses multiple ip, What I mean is that when the msfvenom app is opened in my phone it stays trying to connect to the ...
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1answer
32 views

Kali linux network error

I'm new here and I'm from Tunisia so my English is my 3rd language so forgive me for my bad grammar mistakes. OK, I have Kali 2.0 linux (32bit) installed in windows 8.1 (32bit) (dual boot, no VM), ...
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1answer
26 views

Ubuntu Server 15.10 doesn't recognize internet card

I just installed ubuntu server (the installer connected to the internet with no troubles), and I cannot get it to connect wirelessly to the internet. I've googled to no avail, as there is no ethX ...
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0answers
18 views

Debian Stretch - WiFi issues with BCM43143 (Gets ip then disconnects)

I've fixed up an old ITX desktop that I was given and am running a headless Debian install on it. To install I used the minimal install for Debian Jessie then I proceeded to install nginx, samba and ...
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1answer
1k views

How do I create a USB networking interface for passing internet to my Android phone?

I am working on passing through the internet from my computer to my phone (running Android) over USB. I'm not sure how to achieve this, but I know I will need a usb network interface, such as usb0. ...
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0answers
22 views

Unknown bridge gets recreated after reboot on Ubuntu 15.04@VMWare

I am running Ubuntu 15.04 on VMWare. For the last couple of days I have the issue that I have a "magic" network bridge: I never created this bridge and therefore I tried to delete it with the ...
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1answer
42 views

How can I repeatedly send the contents of a file via socat / ncat to a socket

I'm running some performance testing, and I'm trying to send the same file repeatedly to a socket. If I do something like: $ socat -b1048576 -u OPEN:/dev/zero TCP4-LISTEN:9899,reuseaddr,fork $ ...
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3answers
40 views

How to check which network interface is active and providing internet?

ip link show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: eno1: ...
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0answers
35 views

Why would all our CLOSE_WAIT connections have 24 bytes in the receive queue?

We have an Apache reverse proxy that is having connectivity issues with the back-end. This results in timeout errors such as this: [Thu Apr 21 12:12:26.031207 2016] [proxy_http:error] [pid 64620:tid ...
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1answer
1k 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 ...
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1answer
3k views

Trouble switching from DHCP to a static IP on Kali Linux

When I installed Kali Linux 64bit, I forgot to set up a static IP address, and now DHCP determines my address with my router. I have already modified /etc/hosts and /etc/network/interfaces to declare ...
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1answer
75 views

Can login and browse in shares on samba server, can not access files

I´m pretty new to Linux so I've been having a hard time fixing this. Running the latest version of Mint. The files are stored on an auto-mounted NTFS partition. I can access the share, I can ...
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4answers
58 views

Solaris 10 - changing default gateway and netmask

We have a Sunfire V240 server with Solaris 10,I need to change the subnetmask and gateway. I was able to change the subnetmask and gateway by editing the files /etc/subnetmasks and ...
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1answer
906 views

redirect web server with no-ip and port forwarding in livebox

I want my Apache web server running on a Livebox (home router appliance running Linux) to be accessible from the Internet (WAN). I installed and configured the application noip2 on my Ubuntu PC. ...
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2answers
52 views

How to track my public IP address in a log file?

I'd like to save my public IP address to a log file so I can use them to exclude my own visit to my websites in the stats collections. At the moment I can see my actual public IP ...
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1answer
26 views

Linux machine is not detecting network card

I have a machine with CentOS 6.5 installed. The machine works fine everyday, but sometimes when I reboot the machine, then the NIC doesn't detect. When I use the command ifup eth2 then it shows the ...
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1answer
4k views

Debian, two network cards - “no route to host” on eth1

I have added a secound nic in a debian box. That nic is ment for doing some test stuff, so those devices connected should just be able to access the debian box or be accessed from it. To set up the ...
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1answer
2k views

forward packets from one interface to another interface using iptables

I have an embeded system with 2 interfaces e0 and m0, whose ips are 10.0.0.20 and 192.168.0.20, respectively. Incoming packets into e0 have an ip of 10.0.0.10 and should be forwarded to m0 interface ...
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1answer
3k views

Accounting for /proc/net/dev reported traffic

I noticed that according to /proc/net/dev I am constantly receiving around 6Kb/s on my wireless usb interface. But I can't account for anything even close to that with the individual connections that ...
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2answers
12k views

why can't this CentOS 7 server see wifi connections?

I recently installed CentOS 7 as the sole OS on an Acer Aspire T. There is no GUI, as it is a server with a terminal-only interface. What do I need to do to get CentOS 7 to be able to see and list ...
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0answers
9 views

ALG IPSEC and RSTP

I have linux 3.18. my Linux is installet on a router. in this router I activate a NAT from the wan side. Does this Linux support ALG of IPSEC and RSTP ?
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1answer
32 views

Allowing GRUB to access network in BIOS mode

I want grub to fetch some configuration via tftp/http. Using efi I can do insmod efinet and net_ls_cards will list my network cards which I can configure and use. Using PXE in BIOS/legacy mode ...
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2answers
165 views

How to enable package caching in dnf?

I started using fedora 22 and started learning dnf only to find out about two annoying facts: Almost every time I install or upgrade anything it has to rebuild the whole repository metadata cache ...
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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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1answer
15 views

Are IPv6 link-local addresses assigned by the kernel or by a userspace program

When IPv6 is enabled for an interface, it will get a link-local address assigned automatically based on the MAC of the network interface. But who assigns this address? Is it done in the kernel, or by ...
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0answers
30 views

how to mute an IP stack?

is there any way to mute a network connected device running Linux so that it receives every message targeted on its IP but not sends anything even Acks? or in my case is there anyway to assign same IP ...
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1answer
2k views

Mint 15 on Lenovo G700: wired internet not working (Atheros QCA8172)

Mint 15 doesn't see internet after installing it in dualboot with windows 8 (in Windows internet works well). My network card is Qualcomm Atheros QCA8172 Fast Ethernet (rev 10). What I did: Install ...
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1answer
77 views

What is blocking: Firewall and tcpwrapper?

Is it possible to find whether the firewall (iptables) or tcpwrapper is blocking a connection without accessing the remote server? (Maybe with tcpdump?)
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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 ...
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0answers
12 views

Using dual connection for separate app [duplicate]

My Mint 17 has 2 connections (wired and wireless), when both connected by default the wired is used, what I want to do is keep wireless for file download and general Internet usage, and use the Wired ...
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1answer
2k 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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3answers
6k views

D-Link DWM-156 HSPA USB Modem doesn't work with SIM card inserted

I have a D-Link DWM-156 HSPA modem, that I bought just a few days ago. The modem has drivers in its internal storage. There are Debian packages (.deb) for both i386 and amd64, so obviously I installed ...
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Raspbian Jessie: /etc/network/interfaces doesn't apply inet6 address. How to diagnose?

I'm experiencing a strange issue, and I don't really know how to diagnose it, or how to fix it. My problem is, that the static ipv6 assignment that used to work suddenly isn't applied any more at ...
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5answers
2k views

Get devices name on the network

As in the title i wanted to know all the devices name on the network. I've already tried without great success many commands found on the web, but nothing worked like i wanted to. Basically, when i ...
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2answers
25 views

RHEL Network Interface not restarting

RHEL 5.11 I run the restart command: /etc/init.d/networking restart Then it just sits there until I have to force quit: 15:09:11 # /etc/init.d/network restart Shutting down interface bond0: ...
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1answer
19 views

Connect to guest vm (no wifi driver) from machines on same wireless network as the host machine?

I have my host os with proper wifi drivers that connects to my router. I run a NixOs VM (no wifi driver) as guest. I setup some configs in NixOS and it now has many binary caches that I want to share ...
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1answer
762 views

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

I have a tricky case: +---+ +----+ |D1 +->eth0---------<-eth0-+D2 | | | | | | +->eth1---------<-eth1-+ | +---+ ...
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1answer
34 views

Block incoming port

I installed LabView on a Scientific Linux 6 machine and promptly got a message from our security officer, stating that the port 3580 is open and listening and that this is a security issue. ...
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1answer
3k views

Consistent network interface name ubuntu using pci slot

One can set consistent interface naming via mac address by modifying /etc/udev/rules.d/70-persistent-net.rules. Can you establish consistent interface naming by PCI slot number? (I tried but failed) ...
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1answer
70 views

Configuring and Testing Freeradius on debian

I'm trying to set up a freeradius server on debian (LTS kernel 3.2.0.4amd64; Wheezy 7.10) it seems to want to use freeradius version 2.1.12 Installing the package wasn't a big deal (apt-get install ...
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0answers
10 views

pcfl - Allow ssh for an specific IP

I'm working with pfctl on Mac OS X. Im trying to make a policy/anchor what blocks SSH for ALL ips, minus specific ip. I try this: pass in on fxp0 proto tcp from any to any port < 22 flags S/SA ...
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1answer
5k views

Linux Mint 17, Wifi Slow and Drops Connection, No Ethernet Connection

On a fresh install and updated Linux Mint 17 XFCE, the system cannot maintain an internet connection through wifi, and is unable to connect at all through ethernet. Wifi will work somewhat slowly for ...