Questions tagged [networking]

Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.

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Ping is only succeeding one way

I have two devices (a PC and a laptop) on a small network connected by Ethernet. I have assigned static IP to the NIC of each device. The laptop's NIC has IP 192.168.1.101 and logical interface ...
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File and Printer Sharing disable config

I disabled the File and Printer Sharing feature over the firewall on the windows server to which my abc.com website is connected. This server only hosts website and mail. When I ping abc.com on cmd ...
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Route all connections to specific IP through another server with Iptables

I have 2 servers in the cloud where one has access to stfp on port 22 to IP x.x.x.x Server 1 has access Server 2 does not have access. So i want to reroute all connections to ip x.x.x.x through server ...
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Debian 10 to 11 upgrade LXC unpriv fails to get IP assigned to veth

Just upgraded from Debian 10 to 11 and my unpriviledged container is no longer assigned an IP through the config file. /var/lib/lxc/DNS/config # Template used to create this container: /usr/share/lxc/...
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Need help grocking packet drop stats reported by ethtool (EL7/EL8)

I've been trying to read up on the details of drops as they are reported by various tools (and at various levels) of the OS. So far, most of the info I've been able to dig up by googling seems rather &...
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PFsense with user-specified WAN gateway

In my network I have two different gateways to access the internet. Without PFsense, clients would configure a static IP and configure the gateway that they need. Most clients have two network ...
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temporarily set eth0 to dhcp linux

My ip address on a beaglebone is set to: $ ip address show dev eth0 4: eth0: <BROADCAST,MULTICAST,DYNAMIC,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 64:33:db:...
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FortiClient VPN blocking some traffic, dual adapter setting, blocking access on both networks

i have two adapters, one via ethernet and a wifi one, when i connect to my work vpn i would like only one of those to be configured for the vpn and the other one to work regularly is there anyway to ...
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How can I copy all traffic on a network and forward it to another IP address

I'm trying to use iptables. I wrote this rule on the router, but I can only catch inbound traffic. I would also need to take the outgoing traffic. I'm using this iptables rule: iptables -t mangle -A ...
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Best practice for preferring the network interface that actually has internet?

I have an embedded device where I have three network connections, eth0, wwan0, and wlan0. wwan0 is a metered connection, so I would generally prefer eth0 or wlan0. The problem is that at any given ...
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Use container hostname resolution with network=host

I have two docker container. One is the "backend", the other "connector".. The connector needs to have its network type set to "host" (To receive udp multicast: ssdp/mdns ...
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NATing Traffic Through VPN Tunnel

I have a Fedora 36 server setup running as a gateway. It forwards packets to a further gateway down the line, which works well. I have taken out a subscription to NordVPN, and have used OpenVPN on the ...
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Connection is failing for a particular domain at one of work locations

I try to get a page from one website : root@server:/home/user# wget https://website.online --2022-12-06 14:57:21-- https://website.online/ Resolving website.online (website.online)... 12.13.14.15 ...
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Allowing inbound IPv6 traffic to a host and port when the IPv6 prefix is dynamic?

With IPv4, you used to be able to give a host a static local IP address on the LAN, and use a firewall rule on the firewall/router to forward a port on the (possibly dynamic) Internet-facing IP used ...
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Complicated bridge between 2 servers [closed]

I have 3 servers: comp_a, comp_b, comp_c comp_a ([eth0 «10.15.14.55»]) 10.0.0.0/8 <———> comp_b ([eth0 «10.15.27.61», eth1 «10.15.26.61»] [eth1 «10.15.26.61» ]) <——VPN IPS (left = 10.15.0.0/16 ...
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About Virtual Switches in Windows Server 2019 Hyper-V

For an SMB I work with, I have been given the responsibility of building Development/Staging guest machines. What kinds of virtual switches I can build in Hyper-V are a mystery to me. Would appreciate ...
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How to start up GPD for Palo Alto Network in Headless Ubuntu Server?

Trying to install and work with GlobalProtect from Palo Alto Networks on an Amazon Ec2 . headless machine (runs Ubuntu 22.04). I just installed Globalprotect alright, but it is not working. From some ...
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What is missing in this client-to-client OpenVPN setup?

I've been able to set up an OpenVPN server with several clients using static ips, the static ip is set by adding a line like ifconfig-push 192.168.254.6 192.168.255.1 in the ccd for each of the ...
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Assigning single DHCP server for multiple subnets on vlans (dnsmasq.conf)

I have 3 hosts each connect to a different VLAN, the DHCP server is working fine, it gives all hosts dynamic IPs. My issue is when it comes to iptables rules I can't prevent host 2,3 from a specific ...
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MySQL replication fails with connection error when server has second IP address

For a few days I've been struggling with a MySQL + Docker + ClusterIP problem. I'm trying to create a failover for my servers. If Server1 fails, Server2 should take over automatically. Both servers ...
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Is there a way to monitor data transfer per port on ubuntu?

We are running a server process which has multiple active ports. I would like to know what outgoing data transfer is associated with each port. I would like to see a 24 hour report like: port 30000 : ...
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How is NAT Port Exhaustion handled?

"Port address translation (PAT) resolves conflicts that arise when multiple hosts happen to use the same source port number to establish different external connections at the same time. PAT may ...
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CentOS - nft route beetween two interfaces

I have a server with 2 network cards. I want to route from the 192.168.0.0/24 network to the 192.168.112.0/24 network and back the same way. What am I doing wrong? I have already set forwarding. See ...
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Can't get new NIC working

OS: Ubuntu server 20.04 NIC: Intel XL710-QDA1 DAC cable: FS "generic" QSFP+ Switch: Brocade ICX-6610-24p I cannot get this thing to work. Updated firmware. No change. Ifconfig shows nothing ...
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How to send requests to a server without a public IP address? [closed]

I have a server with a public IP address and there is a server that is on the internal network and does not have a public IP address to which I can't make a request outside the network. I need to do ...
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Getting duplicated packets when replaying pcap files

The issue at hand is I have pcap files that I want to replay over a network. I used to use playcap to do this with no issue, however recently I noticed that playcap is sending each packet from the ...
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Create a dummy interface inside a Windows container

I am trying to isolate the networking inside a Windows container, which is very easy using --network none. The problem comes when I have two threads in the same process trying to communicate each ...
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Can't persist default ip route on Ubuntu 20 (Hetzner cloud)

I am using Hetzner cloud where I created 2 servers in a subnet (10.1.0.0/24) - one only with local ip, another one has public IP and is used as a NAT gateway for the first server. On private server I ...
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PC/Switch (in one subnet) connect to Switch (in another subnet), but not to PC connected to the switch

[UPDATE] The problem/behavior described below was caused by the public network connection on the system -which had a default gateway. The unusual behavior was a result of the private network sending ...
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why ssh Local Dynamic forward doesn't work on centos

I wanna to create a local dynamic forwarding in centos without using another machine as a proxy. so I used dynamic forward command and is working fine in one of my centos vms as vm1. ssh -fN -D 0.0.0....
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VPC network interfaces - hot, warm and cold attach

According to Best practices for configuring network interfaces guide, there are three ways to attach a network interface to an instance: You can attach a network interface to an instance when: it's ...
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Freeradius case sentivitity of letters

I will explain my problem: I have VirtualMachine with freeradius server (3.0). I am using authorization file which contain PPPoE users. The problem is in username. The login is in UPPER CASE which ...
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Connectivity between two EC2 instances does not work

I try to ping or ssh between these instances (A to B), neither work, both time out. Instance A (i-0e332d1880c8f93ae) - CentOS Instance B(i-0a1e4a76358059ba3) - Debian They share VPC, and the ...
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simple openvswitch forward demo not work

What are the details of your problem? Hi, that is my first time try ovs. i am using Arch Linux, and installed openvswitch. use sudo ip link add v1 type dummy && sudo ip addr add 10.0.0.1/24 ...
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KVM/QEMU Virtualization on server with multiple nics to WAN - full split?

long time reader, first time poster...it's been over a decade, crazy. Today, I've set up a left over server from my old job in a local data center for a friend of mine and myself. As by my contract, ...
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debian Linux QinQ (vlan stacking)

I am trying to create stacked VLAN interface on a debian 10 server. Here is what I have placed in the /etc/network/interfaces: iface enp34s0.300 inet manual address 0.0.0.0 netmask 0.0....
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How to setup a server on virtualbox machine's localhost to be reachable in the host system?

I'm trying to access a server that runs on the virtualbox machine. It binds to localhost and want to passthrough the traffic to its external network interface (which is not the lo). The problem is ...
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Is it possible to use DPDK in a server with single NIC?

I have a a server with single NIC which has 4 pci ports. I already tried DPDK binding so before binding "dpdk-devbind.py -s" returns this : Network devices using kernel driver 0000:01:00.0 '...
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Block by IP via Linux Traffic Control

i have 2 PtP Interfaces and i am using TC to realize some simple Passthrough setup. I am mirroring the traffic from the incoming if to the outgoing if like so tc filter add dev <ingress_if> ...
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k8s kubernetes fails initail test

I am new to kubernetes and am trying to learn. I set up 2 VMs and they connect to eachother via a host-only network. I followed these 2 guides: How to Install Kubernetes Cluster on Debian 11 with ...
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Reached pm.max_children, High sockets allocated, No CPU usage

The issue I have a server that reaches pm.max_children (200) without spike in CPU usage. No network traffic (MB out / MB in) but extremely high number of socket allocated that do not get closed. CPU: ...
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How to connect overlapping VNets in Azure?

I am working on an Azure-based networking solution. We have a typical hub and spoke VNets topology. The Hub VNet connects to on-prem DC via ExpressRoute and spoke VNets peer to Hub VNet. There is an ...
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How to forward traffic from one LAN router through another router then to the original gateway?

I have two routers connected to my ISP within one town in the subnet 192.168.0.0/24.Router A can reach router B successfully. I have higher bandwidth on router A than B. I would like to make A the ...
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Windows lost server connection while transferring files via Samba

I have a Ubuntu 22.04.1 server with Samba installed to allow other PC in the local network to upload/download files, there are 2 Windows clients (Windows 10 & 11), and they both are ok to connect ...
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Win 10 VM loses connectivity randomly. Hyper-v, SET teaming, Server 2022

Deployed a new hyper-v server a few weeks ago and during install I read that the old way of NIC teaming does not work anymore for vswitches inside of a hyper-v. It was replaced with SET Teams that ...
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iperf3 errors and retransmissions on ESXi

When running iperf3 to test a 100G connection between a VMware ESXi box and a TrueNAS Core box, I'm seeing the following on the ESXi box: The message "iperf3: getsockopt - Function not ...
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How can the local time clock of a server become the NTP time source in a network?

I want to make a the local te clock in a Stratum 1 server be the network time source for my network (I don't want a Stratum 0 server with the antenna). How may I set this up in a network? Is there a ...
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Piping data from ethernet to serial and back to ethernet doesn't reach destination

CONCEPT VISUALIZED I'm trying to establish a bidirectional communication where ethernet UDP packets enter a linux system (suppose a Raspberry pi) from eth0 interface and piped into the UART hardware ...
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Exposing database on local DNS using Traefik v2

I'm new to Traefik. It's likely that I use incorrect terminology and/or am more confused than I think I am. Corrections are gratefully accepted. I want to expose a database in my local network (domain ...
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Iptables block future connections

I have a problem with DDoS attacks on my game server. It's not an regular ddos attack that will attack directly the machine, but it's attacking a port with many IP addresses (UDP protocol). So, I have ...

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