Questions tagged [networking]
Managing and using network connectivity on a unix system
5,930
questions
-1
votes
1answer
30 views
Ubuntu 16.04 - Cannot reach the Internet
root@ubuntu:/# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback ...
0
votes
0answers
9 views
Bridging a Wifi access point to a VPN connection
I have a computer running Debian that I would like to use as a wireless access point for sharing that computer's ethernet internet VPN connection.
I can setup my openvpn based VPN software on my ...
0
votes
1answer
15 views
Connect (SSH) to the same server, through two different gateways, with different server users
What I would like to achieve is to be able to connect to some target.server from my local machine, without having to type any passwords, with the following commands:
ssh user1@target.server
ssh user2@...
0
votes
0answers
15 views
Zscaler VPN disconnects inside VM
Setup Overview
I created a solution for my team where we create a windows 10 vm on our Ubuntu laptop (host machine). We run zscaler app inside the vm to share the vpn with host machine. Here is the ...
0
votes
0answers
7 views
How to setup shadowsocks gateway?
I have a Ubuntu server in a private network which named S1. In my private network I have another device which is named d1 and it can't use shadowsocks5 but can access network via Wireless.
On S1 I ...
2
votes
1answer
42 views
How to make this network work in this special case?
I have a problem. All my machines are behind a router which is connected to a ETH port on the modem. That port is too limited in download/upload. So, I tried to connect two cables from the router to ...
0
votes
0answers
10 views
Raspberry Pi USB printer shared via CUPS, seen but not working
I have been going mad over my printer, well, not printing. I have been using Linux for years and a Raspberry Pi for a year. Here is the setup and the issue for which I would really appreciate any ...
0
votes
0answers
17 views
How to automatically connect/disconnect to WiFi network only if is needed
Hello everyone I'm user of a metered adsl->WiFi connection trough a captive portal and I want to automatically login/logout from it when its needed or not. I'm able to manually handle the portal with ...
0
votes
1answer
21 views
Remove “Not Secure” Label from a Chromium Shortcut
I have several local network websites that I have added to my favorites bar in GNOME. However, each of the apps have a bar at the top letting me know that my connection is insecure.
Things I have ...
0
votes
0answers
30 views
Resolve a domain with another domain and not an IP address
I am running some containers for automation testing and I need to be able to redirect the domain name to another domain name.
Traffic from abc.com/users need to be redirected to zxc.net/users
I cant ...
0
votes
0answers
18 views
Is MTU path discovery repeated everytime we use tracepath?
If I run tracepath twice, the mtu value I get is same but is the path discovery being actually being done every time or is it so that the value is somehow cached/stored for each active host?
if yes, ...
1
vote
1answer
42 views
Debian 10 static ip configuration script
i try to make a bash script for configure static ip on a selected interface under Debian 10 but i don't know how to do. Manualy, i modify /etc/Network/interface for configure static ip but i don't ...
0
votes
0answers
19 views
Network Settings in Linux -> Multiple IPs
I'm not by any means an expert on networks nor Linux. And I'm trying to solve a network related issue in Linux.
I have a server that I want to make accessable in two different networks (local network ...
-1
votes
1answer
32 views
FreeBSD on VPS unable to connect to the internet; interface appears configured
I've recently installed the raw virtual image of FreeBSD 12.1-STABLE onto a VPS provided through OVH. I'm able to login via the KVM on my control panel, but the machine is unreachable by SSH. It ...
0
votes
0answers
22 views
IP Routing - Multiple Interfaces
I am using Elastix 2.5 (CentOS 5.11) with 4 NIC's (1 for WAN and 3 For SIP Trunk using IP Authentication)
eth0 - WAN
IPADDR=75.XX.XX.162
NETMASK=255.255.255.240
GATEWAY=75.XX.XX.161
eth1 - SIP ...
0
votes
0answers
11 views
How to setup VPN using client.key and .crt files on Linux?
I want to access the servers running on my comapny's AWS VPC from my home because we are working remotely now due to corona, So for that I asked the IT department for VPN credentials and I got a tar ...
0
votes
0answers
13 views
Airodump-ng only writing one line per AP to output file
I'm trying to dump all of the beacons received by the wifi adapter into a CSV file, so that I can monitor the RSSI (Power) over time. The man page states that the flag --beacons will output all ...
1
vote
1answer
35 views
Does Linux have a size limit for UDP payload?
I'm running Debian. If I use Python's scapy module to formulate a UDP packet, and add a payload bigger than about 1500 bytes, my program crashes, even though the maximum payload of UDP is supposed to ...
0
votes
1answer
25 views
Sharing (wifi) internet through ethernet interface
I want to connect two devices, the first is a laptop with ubuntu (connected to internet via wifi), and the second one is a device with a distro linux compiled with yocto. These two devices are ...
0
votes
1answer
15 views
SSH to KVM VM via Host
Got couple VMS that I would like to SSH into, got the services running on both using port 2222. Machines have a static IP assigned to them and i got the script from https://wiki.libvirt.org/page/...
0
votes
0answers
19 views
Custom LXC container not getting auto IPv4
I've created an Alpine Linux container, modeled after the image provided on the lxc/lxd image server. I imported the image using the following:
lxc image import metadata.tar.gz rootfs.tar.gz --alias ...
0
votes
0answers
26 views
Bridge port VLAN tagging
I have two bridges configured. I'm trying to add a veth pair between them, configured so that untagged traffic on one bridge is carried on the other bridge with VLAN tag 5. So far I have this:
$ ...
0
votes
0answers
9 views
VPN: interface OK, route table OK, can't reach local addresses
I'm trying to connect a Debian 10.3 to an OpenVPN VPN through OpenVPN's linux client, installed with apt. The connection is succesfull, the network interface is created correctly and the routing table ...
0
votes
1answer
19 views
How to use my VPS to redirect traffic to certain port tomy Windows PC which is behind NAT?
I have an Ubuntu VPS which is accessible. Also, I have a local Windows PC which is not, because of NAT.
What I want to do, but am struggling with:
I want that all traffic to certain port to the VPS ...
0
votes
2answers
31 views
How to use two network range in single network?
I have a single private network 10.51.8.0/23 (say NetworkA). On the physical network running NetworkA I have single host (say HostA) with IP 172.16.0.24.
My intention is to reach HostA from NetworkA.
...
0
votes
0answers
20 views
SSH to QEMU VM via TAP won't connect, SYN flood?
I have a Fedora 28 workstation with a wireless NIC. I use QEMU to create a CentOS 7 VM. I use the following steps to create a TAP interface on the workstation (based on these instructions):
On my ...
1
vote
1answer
26 views
How to troubleshoot issue with port supposedly open?
I had succsessfully opened a port on my debian machine using iptables:
I started a webserver that I have written in go and that listens to connection on port 12345. It worked fine until this morning. ...
0
votes
1answer
24 views
How to scan range of tcp and udp ports at a time using nmap?
I tried this command but its not scanning udp ports...
nmap --open -p T:22,25,53,80,111,443,465,587,953,993,995,3306,5666,8891,U:53,68,111,323,715 13.235.13.13
What is the correct way for scanning ...
0
votes
2answers
22 views
Get all the open ports for a remote host in linux
Trying to connect to a particular port for a remote host. The host is reachable (checked via ping command) but the port is not accessible.
Is there any way to check all accessible ports for that ...
1
vote
0answers
11 views
Why mesh network nodes do not connect to the internet?
I have 3 raspberry Pi 3 connected to a mesh network with batman-adv, a raspberry has a WIFI dongle and is the gateway to the internet. The gateway configuration is: A file named ~/start-batman-adv ...
0
votes
1answer
19 views
Where can I find the source code of ftpd?
How can I inspect ftpd(the regular Linux FTP server's) source code on my machine?
I'm using Debian 9. Unfortunately I can't figure out which exactly implementation has the package ftpd which I ...
0
votes
2answers
25 views
Centos: Obtain MAC address of a local machine
I have a local network with many machines. From a CentOS server I need to obtain the MAC address of specific IP (and need to automate this for several hundred IPs).
I have tried ping + arp -a, but it ...
0
votes
0answers
17 views
Define specific outbound public IP in servers in single network behind NAT
Case:
I have two CentOS7.5 servers in a single private network. There's a external NAT router for public routing. No server firewall enabled or anything fancy. Servers are not aware of external IPs, ...
0
votes
0answers
16 views
Wired Connection troubleshooting help
Just reinstalled ubuntu to try and fix the issue of my network not working. I've swapped ports on my hub, tried a new cable and reinstalled the OS, but it's not working. Does anyone know how to ...
0
votes
0answers
19 views
Sharing desktop/network of another computer on LAN
I have a work laptop and a personal desktop, for the foreseeable future I'll be working from home and I would prefer working with a keyboard, mouse and multiple monitors I have on my desktop. The ...
0
votes
1answer
17 views
After creating a team connection with NetworkManager, on reboot disappear with strange results
I have created, on Fedora server a team connection using networkManager
nmcli con add type team con-name team0 ifname team0 config /usr/share/doc/teamd/example_configs/random.conf
nmcli con add type ...
0
votes
1answer
18 views
How can I know which program is responsible for an open port?
After running the ss -ltun command on Ubuntu 18.04 I get this:
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
udp ...
0
votes
1answer
24 views
How to open ports to test nmap script?
I need to test my nmap script, which crashes when many ports are open.
So I need a script (python/bash) that opens n ports on a server.
How could I do that?
Thank you
1
vote
0answers
22 views
Are Avahi and Bonjour compatible?
I would like to set up a network printer on my Linux desktop (Parabola GNU/Linux, derivative of Arch) so that my wife can connect to it with her Macbook. I understand that Linux uses Avahi to share ...
0
votes
0answers
32 views
/dev/tun vs /dev/net/tun
I am mounting the /dev/tun device of an IllumOS installation (actually OmniOS, but I don't think it makes a difference) inside a lx-brand zone (using add device, set match=\dev\tun, end). Problem is, ...
0
votes
0answers
25 views
Network interface is not ready until I try and bring it up
My network interface does not come up when I boot. This was happening with systemd, and I switched to sysv (which I know better) and it's still happening.
This is after I boot, no matter how long I ...
1
vote
1answer
19 views
clone complete XEN LVM server including all VMs
I ordered a faster Hetzner root server to move my XEN mashine there with all volume groups, lvm-volumes and VMs.
I already started to create the same xen VMs there, copy config files and userdata and ...
0
votes
0answers
10 views
Cannot connect multiple network adapters in lubuntu running as guest
I am setting up a virtual guest of lubuntu. When adding a new network adapter ind VMware it is configured as disconnected in lubuntu. I can see the interface with ifconfig and with nmcli. However if i ...
0
votes
1answer
28 views
Not managing to ssh to my desktop machine over university network
So the problem is the following. I have to work from home due to isolation, and I need to remote control my desktop computer in my office through ssh.
My desktop computer runs ubuntu 18.04, has ...
0
votes
0answers
20 views
How to remove a network?
I have 3 networks under /etc/sysconfig/network-scripts/ on RHEL:
ifcfg-lan0 ifcfg-lan1 ifcfg-lo
ip a will list these informations:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state ...
0
votes
0answers
20 views
unable to ping with oter devices in a hotspot
In my mobile phone the hotspot configuration is set to open.
When I try to connect to it from my Kali Linux device, it started the process of connecting but after some time it gave a notification "...
0
votes
0answers
20 views
docker_opts and docker daemon restart
I have a docker.env file that looks like this
DOCKER_OPTS="--bip=10.18.0.0/16"
It works as expected and my docker containers have the the IP addresses from the above subnet. When I change it and ...
0
votes
1answer
21 views
which interface will be used for outbound if i have more than one interface?
I am new networking-related concept, Let say I have two networks like below
network A (192.168.0.103/24) connected with interface A
network B (192.168.1.55/24) connected with interface B
What will ...
0
votes
0answers
24 views
Network suddenly became inactive on Kali Linux
I use Kali Linux on Vmware. My internet has suddenly stopped working and when I click on the network icon, it says that network is inactive. I tried all the solutions in this question, but it didn't ...
0
votes
0answers
34 views
NO WIFI ADAPTER, Ubuntu 19.10, Lenovo S340
Lenovo S340, Ubuntu 19.10.
I can't properly identify the Network Card. lspci outputs Intel Corporation Device 02f0.
I've tried Ubuntu 18.04 before with no luck.
I cannot believe this does not work ...
