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Questions tagged [networking]

Managing and using network connectivity on a unix system

3
votes
1answer
1k views

Sane can't see Samsung CLX-3305W network scanner in Ubuntu 14.04LTS

I've installed a new Samsung CLX-3305W multifunction printer/scanner a couple of weeks ago on a dual boot system with W7 on one physical drive and Ubuntu 14.04 64-bit on a separate drive. The printer ...
2
votes
1answer
7k views

Network UNCLAIMED - Unable to access internet

My Kubuntu was working well until I think a day ago, and suddenly I don't have access to Wi-Fi. I've tried turning on the connection via the Connection editor but the box was grayed out. After looking ...
0
votes
0answers
8 views

Could I deal with physical network layer via non-root application without writing networkcard driver?

Could I get fast access to physical network layer using GAS or GCC made program running from shell? Are there possibilities to do it without own drivers creation?
0
votes
0answers
13 views

Can't connect to router

I have a problem with my fresh installed Fedora 30. I have internet access via LAN, but I can't ping my router or any website. Also no DNS server like Google's 8.8.8.8. If I look on my profile, my IP ...
-2
votes
0answers
13 views

Can't access internet connection for arch linux installation

My system: I Have 1024 megabytes of RAM, the processor is Intel Pentium(R) Dual-core CPU E5400 @2.70GHz 2.70GHz, manufacturer is biostar and the model is G31D-M7 and now I'm using windows 7 home ...
1
vote
2answers
8k views

Unable to connect to any wifi with NetworkManager due to error: Secrets were required, but not provided

Using NetworkManager on Arch Linux on a MacBookPro14,3, I am unable to connect to any wireless network. I've tried connecting to a number of different WiFi networks (home, mobile hotspot, work) all ...
1
vote
1answer
17 views

Default TCP KeepAlive settings

The TCP KeepAlive (socket option SO_KEEPALIVE) is governed by three options—time after which the mechanism triggers, probing interval, and number of failed probes after which the connecting is ...
1
vote
1answer
5 views

How to cleanup network interfaces after an LXC container crashes on startup

Today I modified an LXC container to add an extra "bind mount", but forgot to create the mount directory in the container root filesystem. As a result the container startup failed, and left the ...
0
votes
1answer
29 views

Is it possible to talk to a different subnet through another device?

I am trying to adjust the networking on a system so that two subnets can talk to each (ping) other via a device. Setup looks as follows: (192.168.1.128) (172.16.248.223) Router <------&...
3
votes
1answer
90 views

How to connect to ieee8021x Network using connman

Connect to my private WPA2 Wifi with connman works like a charm (followed this instructions). But when I try to connect to ieee8021x Network, i always get this error: Error /net/connman/service/...
0
votes
0answers
12 views

Swapping source and destination mac address cause packet to not be sent

I am currently testing a scenario using Python and scapy. When I send a packet which has a src mac of 80:CA:0E:BD:60:3B and destination mac of 82:DA:0E:BD:60:3A, the packet is sent out the specified ...
0
votes
1answer
1k views

Install brctl for OpenWrt - which package?

I'm getting an error in OpenWRT Attitude Adjustment that says: -ash: brctl: not found when I run brctl addif br-lan mesh0 I tried: opkg update opkg install brctl But I got this error: Unknown ...
0
votes
1answer
571 views

Unable to load SFP+

I am using CentOS7 7.5.1804. I have a Intel 82599 based 10gig SFP+ card. When I try my SFP's I get: failed to load because an unsupported SFP+ or QSFP module type was detected. I tried everything I ...
0
votes
2answers
870 views

KVM Linux guest cannot get network address

I use libvirt-manager to manager my VMs. I create a new VM, and a default virtual network, which uses NAT. virsh net-edit default gives me: <network> <name>default</name> <...
1
vote
2answers
46 views

netstat lists ip addresses not found in “ip address list” or ifconfig--what's going on?

My understanding was thatsudo netstat -tlupn gives me all the addresses/ports that have processes listening and that ip address list or ifconfig (though I guess the latter is deprecated) would give ...
0
votes
0answers
16 views

Alfa Awus036ach causes password prompt loop, won't connect

I want to use my Alfa Awus 036ach wireless card in my Debian 9 (stretch) system.  The system is dual boot; the other OS Kali Linux, where the cards works properly, so I assume this is not a hardware ...
71
votes
8answers
99k views

Simple way to create a tunnel from one local port to another?

I have a development server, which is only accessible from 127.0.0.1:8000, not 192.168.1.x:8000. As a quick hack, is there a way to set up something to listen on another port (say, 8001) so that from ...
0
votes
1answer
22 views

netcat no route to host on port 80 but not on 22

I am in a vpn into another country. I have a VM there that I can reach via ssh. It's awfully slow but it works. Netcat to port 22 also shows open port and reports with openSSH banner. So the routing ...
3
votes
1answer
34 views

OpenBSD Supported Hardware

I've recently installed OpenBSD on my Lenovo Ideapad 510s-14ISK. Unfortunately, it seems that my current network card (Qualcomm Atheros NFA435 QCA9377-5 / NFA 344 QCA6174 WiFi 802.11ac 1x1 + BT) is ...
1
vote
2answers
7k views

How to allow guest OS to access Internet in qemu?

I've created a Windows XP image and I'm booting it with qemu. When using "user mode networking" via -net user, my guest os (windows xp) gets the 10.0.2.15 IP assigned and I can ping 10.0.2.2 so ...
3
votes
3answers
409 views

Backup and restore of Centos network interfaces

I have a server running Centos 7 which needs to be rebooted to upgrade some software. Some of the physical NICs have around 5-10 VLAN interfaces each. They're subject to change on a weekly/monthly ...
2
votes
0answers
135 views

Fedora 30 causes problem with MTU bug

The issue After installing Fedora 30 (KDE) on my laptop my router would crash shortly after I connected to it. This happened both when I connected through wired Ethernet and Wi-Fi. Fortunately, the ...
1
vote
0answers
21 views

Can I (IGMP) join a stream on two NICs and answer (IGMP) queries on both NICs in Linux?

I made a Linux application to receive multicast traffic. It works when I connect to one interface. When I connect to a stream, in Wireshark, I see an IGMP join, and when the switch sends IGMP queries, ...
3
votes
0answers
50 views

Why is my client getting two IP addresses when connecting to WiFi?

A sub-question: why is my client requesting a specific IP address without a dhclient running? I have two access points. One is serving up two SSIDs, the other just one SSID. When I connect to the two-...
0
votes
1answer
30 views

How Can I Make My KVM guest VM Accessible from the External Network?

I am creating a kvm setup for POC. KVM Host IP range: 172.21.158.0/24 KVM GUEST VM Range: 172.21.183.0/24 default virtual network with NAT forwarding :192.168.100.0/24 below are the guest vm NIC ...
8
votes
2answers
21k views

recvmsg returns 'EAGAIN (Resource temporarily unavailable)'

After a recent server move, we are troubleshooting this wierd issue of one of the server losing n/w connectivity for no apparent reason and regaining the connectivity in a few seconds or minutes. ...
0
votes
0answers
27 views

How can I Improve the Performance of My Linux Netfilter module? [on hold]

I wrote a very simple netfiter module. In it, I defined 3 hooks: localout and forward to change packets that go out of my PC and prerouting to do the inverse process. localout & forward hooks: ...
0
votes
1answer
4k views

How to route between interfaces

I have the following setup: (192.168.4.1) Device A <-------> device B <-------> Device C (192.168.5.84) (192.168.5.1) (192....
0
votes
1answer
11 views

RHEL 7 multi-user.target disables Wi-Fi

Every time I set my system target to multi-user.target, I lose connection to Wi-Fi and thus can't control my machine via ssh after a reboot, and when I go to /etc/sysconfig/network-scripts, I don't ...
0
votes
1answer
63 views

Locating Drivers for Intel AX200 Wireless on 5.1 Kernel

I recently purchased a new laptop which features an Intel Wireless-AX200 Networking device for Wi-Fi and Bluetooth connectivity. I installed elementary OS 5.0 "Juno" along with the latest stable linux ...
0
votes
0answers
17 views

Linux seperate a network into two using MACVLAN - one for internet, one for internal communication

I have two minimal embedded devices that has ip, ipconfig, nat, etc support. The embedded devices share network over USB. I want to configure each board so that they have two seperate interfaces, ...
1
vote
0answers
24 views

wol: MagicPacket received; machine not waking up

As a follow up to this question. I've confirmed and double-checked that the MagicPacket is not filtered that the ethernet-card in the machine is powered after shutdown that the MagicPacket is ...
1
vote
1answer
26 views

No internet connection with some routers

On my laptop I run Debian Testing with no Desktop Environment. I manage the Wifi connections by adding entries to /etc/network/interfaces and then running /etc/init.d/networking restart. dmesg says: ...
0
votes
0answers
30 views

jessie: wake-on-lan -> ok; stretch: wake-on-lan -> broken

I upgraded a headless machine (with openmediavault) from jessie to stretch and after that wake-on-lan stopped working. I ran down the following checks: >ethtool eth0 ------------------- Supports ...
-1
votes
0answers
9 views

Constant “Network connection activation failed” errors [closed]

For some unknown reason, my computer(running 18.04.1) has been giving constant "network activation failed" errors, resulting in periodic gaps in connection of roughly 5-seconds at several points ...
0
votes
1answer
32 views

How to set an IP from a specific range with dhcp?

I want to set a IP to my Debian machine using dhcp but I only want to select that IP from a specific range . For example, my net is 10.0.100.0/24 and the range has to be from 10.0.100.90 to 10.0.100....
1
vote
0answers
17 views

how does the expose port work in buildah

I have windows 8.1 OS with vmware workstation installed running the rhel8 server as guest OS. In the rhel8 server i am building a image from an already existing tomcat container as below [root@...
5
votes
1answer
107 views

RHCE Study Lab: KVM networking and ping issues

I'm trying to setup an RHCE study lab per Michael Jang's RHCSA/RHCE setup guide. I've followed the guide in the book to the dot, though in my opinion a lot of information is missing (step by step ...
1
vote
2answers
2k views

Why are routes set in /etc/network/interfaces not added when the interface comes up?

Here is my interfaces file: auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp auto eth0:0 iface eth0:0 inet static address 10.20.8.231 netmask 255.255.255.0 ...
2
votes
1answer
40 views

How do you create an network interface without generating an associated route?

I'm having a hard time creating a network interface without a static route being generated to use the default gw. More specifically, I'm trying to create a VLAN interface using the following ifcfg ...
1
vote
0answers
10 views

Point-to-Point VPN: Ping works perfectly, but data transfer works only towards one side randomly

I have two networks connected trough a VPN connection (Wireguard). Let's call them Site A and Site B. The VPN connection is working, routes are set, and all machines from Site A and Site B can ping ...
1
vote
3answers
2k views

How to resolve hostnames with Raspbian 5/5/2015?

I'm trying to share an NTFS drive, or a directory on the drive, via samba, and I have found several tutorials that show it being done in just a few minutes (minus the updates and package installs). I'...
2
votes
0answers
64 views

Bonding onboard ethernet with USB modem dongle

I have a RaspberryPi 3b+ with a raspbian OS on it. I'm trying to bond the onboard ethernet with a USB modem dongle (Huawei E3372, HiLink fw). The problem is that when ethernet cable is switched of, ...
0
votes
0answers
13 views

multicast configuration

I have a multicast application running on the router with openwrt. The application is sending data to 224.0.0.7. How should the network be configured so that multiple clients connected to this router ...
1
vote
1answer
2k views

How do I apply a manifest from a Puppet Master server to a Puppet Agent node server?

I installed Puppet Agent on a CentOS 7 server. I installed Puppet Master on a different CentOS 7 server. I'm using the free version of Puppet on both servers. The Puppet Agent server requested a ...
0
votes
1answer
14 views

Prevent netplan from creating default routes to 0.0.0.0/0

I have running an Ubuntu 18.04 with 2 ethernet NICs. On both NICs I'm using DHCP. How can I prevent netplan from creating a default route to 0.0.0.0/0 on both devices? I want one NIC routing to 0.0.0....
0
votes
0answers
14 views

Forwarding mDNS packets from an on-prem network to cloud server and back

We have an application running on an on-prem Linux server configured with a trunk port and its working is tightly associated to multiple VLANs traffic and certain device IPs present on the same ...
0
votes
0answers
15 views

Bridge one IP to VM

I have a server with a single NIC and two IPs. I've set up the primary IP on the actual NIC and i added a virtual NIC that's listening on the second IP. Now, i need to bridge the second IP to a VM. ...
5
votes
1answer
5k views

Arch linux installation - no internet connection and can't ping gateway

I'm doing a clean install of 32 bit Arch Linux from a CD on a very old Panasonic CF-29 Toughbook. Trying to connect to the internet from the terminal on the installation iso is not working. I'm using ...
3
votes
2answers
4k views

Disable the wireless network adapter in arch

I am running arch on a notebook, but I do not need the wireless connection. Nevertheless the adapter is continuously running, even if it is not necessary. Is it possible to disable it temporarily? And ...