Managing and using network connectivity on a unix system

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70 views

Combine Two SSH Commands

The first ssh command is done on my computer, I enter the key password, then put the second ssh command in while logged into the server. ssh -i cloudkey -L 6000:localhost:6001 admin@54.152.188.55 -p ...
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0answers
18 views

Wep authentification fails with netctl

When trying to connect to a network protected by wep on my laptop I get the following error: Wpa association / authentification failed for interface <interface> I have the latest version of ...
0
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1answer
30 views

SSH - How To Make Three Computer Tunnel?

ComputerA connects though putty to Server at port 77, and there is a reverse tunnel set up from the Server at port 6666 to ComputerA at port 22. ComputerA also has a ssh server set up with a user ...
2
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1answer
26 views

CentOS requires root pw for network pref changes

Why does CentOS require root privileges to configure the preference panels? It seems like sudoer access really should be sufficient for this. Is it possible to change this?
2
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2answers
59 views

Static IP configuration on openSUSE

Long-time Windows user here -- this is a beginners question, network-configuration (especially on Linux distributions) is not my area. I believe I've done my research, however. Although I might've got ...
2
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1answer
54 views

Unable to reach network from chroot

I have a complicated scenario, with most of the complicated parts working: SD card contains a Fedora 23 Raspberry Pi install on a LUKS/BTRFS filesystem. Fedora 23 x86-64 VM being used to manage the ...
0
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1answer
19 views

how to configure a linux machine to broadcast the incoming traffic

I want to configure a linux machine so that it can broadcast all the traffic received by it to other linux machine (in this case the connected nodes). Can someone help ?
3
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1answer
66 views

Which process sent data out of my computer?

Using vnstat, I observed a lot of uploaded data from my computer and I don't know which process sent data out of my computer. Is there a tool to get stats on how much data a process consumed during a ...
3
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2answers
38 views

How can I auto-close dropped SSH connections?

When I work on my server remotely, sometimes my SSH connections get dropped due to network issues. When I re-connect to my server, the dropped sessions remain open. I can see them when I run w. I'm ...
9
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1answer
286 views

Cloned system + network interfaces

I'm currently in a little bit of a pickle. I've made an image of my system and I have given it to someone to run. They have successfully flushed their system with the image and are running it. The ...
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0answers
20 views

Resolve NetBIOS Names via Samba 4.4

Through StackExchange, we knew how to configure Linux to resolve NetBIOS names, and I have configured my system in those ways. (I have installed winbind, configured my /etc/nsswitch.conf correctly and ...
0
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1answer
30 views

Trouble Creating Virtual_IP for PaceMaker + Corosync - CentOS 7

Ok so I have gotten fairly far into the configuration successfully, the two nodes have authenticated each other and all is well, but when I try to add the virtual_ip it never starts. What i've used ...
2
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1answer
42 views

How go generate a valid and random MAC address?

You probably know that MAC address can be generated, for instance, in the following way: macaddr=$(dd if=/dev/random bs=1024 count=1 2>/dev/null|md5sum|sed ...
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1answer
22 views

how to change all the hostnames reported by hostname --all-fqdns?

Running hostname -A reports two host names: an incorrect one that doesn't even resolve to my server and a correct one. $ hostname -A notmyhostname.notmydomain.com myhostname.mydomain.com The ...
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0answers
40 views

Can't ssh into my server from another computer

I used to be able to ssh into my server from other computers. But I stupidly messed up my remote connection setup a couple weeks back (I don't remember what I did...) and now I can't ssh into my ...
3
votes
2answers
97 views

WPA supplicant dropping/disconnecting NIC in hotel wifi

TL;DR WPA Supplicant intermittently fails on my Raspberry Pi 3 when using a USB Wifi dongle. It appears to do this when "reconnecting" to or changing access points in the hotel. WPA GUI states: ...
3
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1answer
34 views

How do I configure Docker containers to have unique IP addresses that are not the default ones?

How do I configure Docker containers to have unique IP addresses that are not the default ones? The Docker containers will run Apache or some web service. These Docker containers will share one host ...
2
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0answers
42 views

How do I get Consul to work so I can get Docker Overlay to work?

I am running CentOS 7 with Docker. I am trying to install Consul on the Docker server. Consul is unzipped. The binary file works for showing the version. I ran this: echo $CONSUL_RPC_ADDR This ...
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0answers
60 views

Unprotected Windows Shares Still Requiring Password in Linux Mint

I am trying to access my windows shares from linux mint. I have 2 windows computers (both Win 10) and my laptop on Linux Mint. My office PC is password protected and can access those files from my ...
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0answers
17 views

The domain and search options in resolv.conf [duplicate]

Let's say you have a resolv.conf file that's something like this. nameserver 192.168.0.7 nameserver 192.168.0.8 domain somedomain.local Then let's say you just changed it to this. nameserver ...
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0answers
23 views

Home directory does not mount on kernel update

My home directory will not mount on booting with new linux kernel. Previously, my home directory has been mounted automatically from a network device. I updated my kernel to 4.6.0 from the git ...
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0answers
22 views

What does TCPRcvCoalesce, TCPAutoCorking and TCPHystartTrainCwnd in netstat mean?

We have some RHEL7 Apache reverse proxies that experienced a performance degradation event. After a few hours, restarting Apache restored performance to normal levels. We are trying to determine the ...
3
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2answers
62 views

Basic network via command line

I am using Fedora 23. Using the file explorer I "found" this page It shows where I can access other networks, I can click on them, and log in... My questions is: Is there an equivalent place ...
2
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1answer
19 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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4answers
55 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 ...
0
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1answer
41 views

Bridge 2 wifi connections

I have set up Ubuntu desktop on my laptop with an internal wifi card and an external USB WiFi dongle. Both WiFi interfaces work. I'd like to make one into an access point, and the other into the ...
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0answers
28 views

iptables forward all traffic to 2 different interfaces

I'm currently using dnsmasq to create a small Debian box as a DHCP and DNS cache server. Until today, I had just 2 interfaces (eth0, eth1). One connected to my WAN (eth0) and one connected to my LAN ...
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0answers
36 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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0answers
26 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 ...
0
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3answers
54 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
46 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 ...
0
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1answer
33 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 ...
2
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1answer
93 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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0answers
58 views

IPSEC help using Strongswan on CENTOS 6.6

I have been tasked with setting up an IPSEC tunnel to our remote data provider. They require my Phase 2 traffic to be PAT'd behind a public address. I am using strongswan 5.3.2 on CentOS 6.6 on a ...
1
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1answer
27 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 ...
3
votes
2answers
76 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 ...
3
votes
1answer
57 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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0answers
12 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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0answers
41 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 ...
0
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1answer
17 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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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 ...
0
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2answers
50 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 ...
0
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0answers
36 views

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 ...
0
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1answer
25 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
38 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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2answers
33 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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0answers
12 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 ...
0
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1answer
46 views

Not all traffic routed through openconnect VPN

I'm trying to connect to a VPN network using openconnect with the following command: sudo openconnect -s /etc/vpnc/vpnc-script SERVER I manage to connect to the VPN, so that I can connect to PCs in ...
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1answer
27 views

Meaning of address and route scope

I've been searching information concerning the meaning of scopes both in addresses and routes but I don't understand the documentation I've read so far. This is what I've been reading: man 8 ip ...