Skip to main content

Questions tagged [networking]

Managing and using network connectivity on a unix system

Filter by
Sorted by
Tagged with
0 votes
0 answers
9 views

NFT Tables: modify DUP packet

I have a server H with two NICs with ip address 192.168.105.10 and 192.168.104.10. An application running on H receives data from server C on UDP port 1703. Server C IP address is 192.168.105.14 I ...
sbabbi's user avatar
  • 101
-2 votes
0 answers
12 views

Wifi adapter is at monitor mode but still wont change to wlan0mon and airodump-ng won't show any nearby networks

My wifi adapter is set to monitor mode but it won't change from wlan0 to wlan0mon. When l manually change it using "ip link set wlan0 name wlan0mon" or just leave as it is. I then run ...
Takudzwa Murombedzi's user avatar
0 votes
0 answers
28 views

client disconnects when transferring larger files

[This is mostly a cross-post from Rasp Pi Forum. To be self-contained, let me also include the descriptions.] My setup: Ubuntu 22.04 [Also tried on Ubuntu 24.04, same thing happens] Rasp Pi 4B I have ...
badatmath's user avatar
0 votes
0 answers
7 views

PTP4L Not working as expected after changing domainNumber

PTP Not working as expected after changing domainNumber I am trying to send ptp frames from ptp4l (version 4.3) using the following command sudo ptp4l -i eth0 -m -2 -S -P --logSyncInterval=-1 --...
Shriram Sivakumar's user avatar
0 votes
1 answer
26 views

SSL Handshake Error across several Fresh Oracle Linux 9 Installs

I have been trying to install the latest version of Oracle Linux 9.4, but I am unable use network functionality out-of-the-box or make any SSL connections, like updating packages or browsing the web. ...
anti4r's user avatar
  • 71
-2 votes
1 answer
25 views

Running CIS Benchmark broke my connection to the Internet?

On my Ubuntu machine, after running the CIS Benchmark, I can no longer connect to the Internet.
SuperDialga's user avatar
1 vote
0 answers
14 views

SLAAC and SLAAC+DHCPv6 configuration using udhcp6

I am working on an embedded system and it uses udhcpc6 as its DHCPv6 client. If I set an interface to 'dhcp' in the /etc/network/interfaces file, udhcp and udhcp6 automatically start. I then connect ...
NickG's user avatar
  • 131
0 votes
1 answer
24 views

What happens with bridge packets after they arrive at bridge?

Hello I have a simple setup for explanation purposes created with following scripts:` env.sh CON1="con1" CON2="con2" NODE_IP="10.0.0.20" TUNNEL_IP="172.16.1.100&...
TheCoolDrop's user avatar
0 votes
1 answer
22 views

How to record packet/frames data without a pcap header

I'm trying to capture raw/binary Ethernet traffic from my interface, so I can parse it using C. I don't want to parse any PCAP headers. I would prefer without the preamble and end bytes, but it's okay ...
intrigued_66's user avatar
0 votes
1 answer
27 views

Setting up network manually, no dhcp, IPV4 only

I’m trying to configure ip (static, so without dhcp), there are some problems that I can't resolve by my self, because I do not understand it in a whole. Sorry if it is already answered, but as I said,...
anothereality444's user avatar
0 votes
1 answer
17 views

nmcli connection modify does not work as intended when using alias

Using an alias in nmcli connection modify seems to append the value regardless of the prefix used. For example, nmcli connection modify wifi -ip4 192.168.1.10/24 does not remove the IP but add it. ...
Neox's user avatar
  • 111
0 votes
0 answers
39 views

Conman fault? Or do I make a mistake?

I have used a wireless connection with conman that is new to me, as on my new notebook I am using debian linux lxqt with version 12 bookworm . Now I did install some new devices that do not use dhcp ...
Andreas Bartels's user avatar
0 votes
0 answers
16 views

nmtui usb0 interface help

I am trying to connect my Samsung S9 to a Variscite imx8m DART-PLUS module using USB-Tethering. I would then like to mirror or control the DART-PLUS module from the phone. I am using Debian 12. I was ...
Brent Richardson's user avatar
0 votes
0 answers
15 views

Time-sensitive network for connected applications using OPC UA

I have been developing an application that would benefit from faster, more reliable, and ideally synchronized, communication. This led me to look at whether we could implement the App using the open-...
Robert's user avatar
  • 101
0 votes
0 answers
30 views

NetworkManager and DHCP issues with WLAN on HP laptop running Gentoo

I'm running Gentoo. I have a HP laptop with the touch screen. I put the default GNOME on it. Problem was that Wayland didn't like touch screens. So I did the update and put X on it. Everything worked ...
Igor's user avatar
  • 243
1 vote
0 answers
38 views

How do I configure 2 public IP addresses on Debian and enable NAT traversal on one?

I got 2 IP addresses from my hosting company, xx.xx.xx.109 and xx.xx.xx.110, both in the same subnet. The subnet mask is 255.255.255.192 and the gateway is xx.xx.xx.20 I have a Proxmox server and ...
WarningSign's user avatar
0 votes
0 answers
26 views

How to fix netplan error on Rocky 9.4 FileNotFoundError

I am running Rocky 9.4 and installed netplan by: sudo dnf install netplan Before making any changes, the ip address via dhcp is 192.168.0.102 and the ethernet name is enp0s3. I created file /etc/...
arcomber's user avatar
  • 274
0 votes
0 answers
33 views

ISC Kea equivalent of ISC DHCPD "group" statement

With ISC DHCP (which is EOL) I used to group hosts with the group statement. It was useful to, for example, change a BOOTP filename for all of them at once, or set some parameters for testing. ...
Kamil's user avatar
  • 1,491
0 votes
0 answers
14 views

how to generate traffic to increment FramesLostDueToIntMACXmitError

I am working to verify a network driver. As part of that I need to see if the following counters get incremented # ethtool -S eth0 --groups eth-mac | grep FramesLost FramesLostDueToIntMACXmitError ...
David Gas's user avatar
0 votes
0 answers
17 views

Issues mounting and accessing Netgear ReadyShare USB drive with smbclient and CIFS

I've a Netgear router and the possibility to attach an usb harddrive for readyshare. Netgear supports windows. NetBiosName: readyshare folder:media1 if i use Options:read all - no passwd, Write: ...
Schmaehgrunza's user avatar
0 votes
1 answer
28 views

How I can sniff network from host to quest that uses wifi usb device?

I want to achieve this: I have a Linux guest VM using QEMU, using directly a USB Wi-Fi stick via USB passthrough. In the meantime, using wireshark, I want to sniff the network data from it. In my ...
Dimitrios Desyllas's user avatar
0 votes
2 answers
31 views

Prevent podman containers from using AAAA results when there are no ipv6 routes

I am having a problem in which applications running in podman containers are attempting to use ipv6 addresses, despite the container having no ipv6 routes (other than the expected link-local addresses)...
larsks's user avatar
  • 36k
2 votes
1 answer
107 views

Docker as for deployments on servers

I have a /28 of public IPs. I do not know much about Docker and would like to see if it would fit my use cases. I currently use virt-manager/KVM. Docker docs talk about bridged networks, but it's ...
fadedbee's user avatar
  • 971
0 votes
1 answer
51 views

iptables: NAT bridge traffic

Background I have a linux machine with bridge interfaces as shown below... ---{prenat}--> ---{postnat}--> source: 172.25.0.3 source: 192.0.2.1 +---------------...
mc1's user avatar
  • 11
0 votes
1 answer
29 views

Additional "rules" for systemd network interfaces?

I'm very ignorant about this topic, so i may use wrong terms or concepts. I'm sorry for that. I'm creating a bash script which configures a BeagleBone Black after that the original Debian image is ...
Parduz's user avatar
  • 225
0 votes
0 answers
11 views

TCP RST doesn't reach process running inside Podman container

I'm debugging an issue I'm seeing where connections between a podman container and the host aren't being closed inside the container. I've written very simple test programmes: server and client. ...
jezza's user avatar
  • 138
0 votes
0 answers
34 views

linux + how to close connection that are not in used

from netstat -anp | grep :8088 | grep EST we can see the following connection ( is example from our hadoop server ) tcp 0 0 192.83.23.112:42360 192.83.66.114:8088 ESTABLISHED ...
yael's user avatar
  • 13.4k
0 votes
0 answers
45 views

Help to debug no internet on debian after restart

There's other questions similar to mine, but some of the answers don't work for me, or some just resolved on their own. I have Debian 11 with no DE installed. I restarted it and it doesn't have ...
alanj's user avatar
  • 29
0 votes
0 answers
25 views

PCI Passthrough PCI Slot Reference Change

I'll do my best to explain this as its confusing. I have Qemu/Virtual Machine Manager on my host PC. I created an Ubuntu VM and assigned two PCI slots (which are physical network cards) to it within ...
john smith's user avatar
0 votes
0 answers
34 views

Why receiving TCP network packets require more memory bandwidth and CPU utilization than transmitting packets?

I am analyzing an ARM system with Linux kernel 5.15 running. I am running iperf3 to measure the network throughput between two ARM systems. Note that these are simulated systems and are loosely ...
sammy17's user avatar
  • 95
0 votes
0 answers
16 views

Cannot ping virtual subnet through strongSwan VPN

I set up strongSwan VPN, but I cannot ping the internal subnet.  The subnets are set up as virtual interfaces. “A” side: conn vpn-test type=tunnel auto=start keyexchange=ikev2 authby=secret left=188....
DevGuy's user avatar
  • 1
-2 votes
1 answer
28 views

Trouble connecting to NAT and using Aircrack-ng in Kali Linux on VirtualBox

I am connected to my VirtualBox through Wi-Fi and have selected the bridged adapter in Kali Linux. However, when I try to connect using NAT, it is not working. Additionally, I am having problems with ...
kkchowdary's user avatar
0 votes
1 answer
45 views

What other subsystems are responsible for enabling IPv6 in when it has been disabled in sysctl.conf, and how can I track which one is enabling it?

Although I have disabled IPv6 in sysctl.conf (Debian 11), connecting my main switch to an IPv6 enabled router results in IPv6 addresses being allocated on Debian interfaces and I can ping and SSH to ...
vfclists's user avatar
  • 7,619
3 votes
1 answer
164 views

old network printer/scanner on latest samba

Although this is for Xerox Phaser 3635MFP, symptoms may be similar when connecting an old network printer/scanner to a latest version of Samba server. The scenario is: latest Samba server (4.17.12) ...
likewise's user avatar
  • 570
1 vote
2 answers
39 views

Connect to a device on a different subnet

Device 1 is connected to a network with gateway 172.16.96.1 and netmask 255.255.240.0 Device 2 is connected to a network with gateway 172.16.156.1 and netmask 255.255.252.0 Can I ssh from Device 1 ...
Krzy's user avatar
  • 11
0 votes
1 answer
77 views

How to turn WIRED-PROPERTIES.CARRIER to on from off

I am troubleshooting a network problem after I upgraded from Centos 7 to RHEL9. The only difference I can see different from a Centos 7 host is: WIRED-PROPERTIES.CARRIER: on vs RHEL9 WIRED-PROPERTIES....
Alejandro De la Rosa's user avatar
0 votes
0 answers
23 views

How is the namespace able to communicate with eth0 without NAT here

I was following this tutorial https://github.com/faysalmehedi/linux-network-namespaces-hands-on I had to use this command so that our ns1 namespace can talk to eth0, where 192.168.1.1 is the IP ...
Arjun Hegde's user avatar
1 vote
1 answer
88 views

Why ss show a port is in use but lsof doesn't?

When I use ss (socket statistics) to show the usages of port 5432 I get: $ sudo ss -ln | grep -E 'State|5432' Netid State Recv-Q Send-Q Local Address:Port Peer Address:...
Marco Lackovic's user avatar
1 vote
0 answers
61 views

TCP out-of-order and GRO feature with linux kernel 5.14

according to the RFC9293, the PSH flag will be set in the last TCP segment created from the buffer (Ref. https://datatracker.ietf.org/doc/html/rfc9293#name-send). I'm in a scenario where the traffic ...
Mr Wolf's user avatar
  • 11
0 votes
1 answer
49 views

Debian: Can you define veth in /etc/network/interfaces?

I found the following documentation for Ubuntu. Does Debian have a similar page? I'm looking for something comprehensive-- not just a few random examples. I can create veth using the ip command, so I ...
David's user avatar
  • 3
0 votes
1 answer
64 views

What is a port?

I have been running an Apache web server for numerous years and have been using ports as a medium to serve requests. Recently, I began using Unix sockets to serve MySQL requests. The function of Unix ...
user10709800's user avatar
1 vote
0 answers
43 views

Idle Ubuntu Server with only standard system services running produce 2-6 GB incoming traffic per day

I recently setup a new server with Ubuntu 22.04. No web server, no no FTP server, no mail server; just a freshly installed Ubuntu Server where I did not much except installing some extras like nethogs ...
Luke's user avatar
  • 21
0 votes
0 answers
34 views

StrongSwan VPN Interface Issue

I need help understanding interfaces in Linux. I set up a StrongSwan VPN. The client asked for a specific subnet so I created a virtual interface called eth0:1. The LAN interface is eth1. In the ipsec....
Linuxnewbie's user avatar
0 votes
0 answers
47 views

how to enable, disable, experiment with, and monitor the use of Receive Side Scaling (RSS) technology on my system LINUX

I am specifically looking for instructions on how to enable, disable and monitor the use of Recieve Side Scaling (RSS) technology on my Ubuntu system. I have tried different ways to activate and ...
Pedro Victor Lima Barbosa's user avatar
0 votes
1 answer
68 views

Linux won't send multicast packets to interface

I have a server on VPN configured as a TAP device (as opposed to TUN, since it is joining to a wider network). I can send unicast traffic of that network, as well as receive multicast packets (and ...
Charles Lohr's user avatar
0 votes
1 answer
23 views

Limiting a process to only allowed to use specified network interface

I have binary program named wstunnel. That program has no option to specify outgoing traffic. By default it will use ens3. I expect the program will use warp interface. I'm not sure iptables can solve ...
Muhammad Ikhwan Perwira's user avatar
0 votes
0 answers
62 views

How do I run pi-hole using Podman?

I am building a home server just for fun and for the learning experience. This is my first time, so I am relatively new to all of this. The plan is to run things like pi-hole and Nextcloud and a few ...
ppflaum's user avatar
1 vote
1 answer
44 views

802.11n USB wifi adapter (LM Technologies LM816-0648-3 Realtek 00E04C0001) crashes system

I have a desktop running Ubuntu Studio 22.04.1 LTS with kernel 6.2.0-1018-lowlatency, with an LM Technologies LM816-0648-3 Realtek 00E04C0001 802.11n NIC USB wifi adapter. Wifi use locks the system (...
MRule's user avatar
  • 190
0 votes
0 answers
44 views

Internet works after rebooting, periodically stops and starts working

I have installed postmarket OS on my old chromebook on an SD card. Every time I restart or resume my laptop (as in, close its lid for a bit and then open it again), the internet connection works, but ...
xSK's user avatar
  • 1
0 votes
0 answers
91 views

No route to host (SSH) depending on the client

I am running sshd on port 22222 on a Fedora machine and tested ssh connection from a Mac within LAN and everything works. I also set up port forwarding from the router to my fedora machine and allowed ...
Mattiatore's user avatar

1
2 3 4 5
160