Questions tagged [networking]
Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.
15,666
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How to set Netplan networking configurationfor CloudStack bridges on Ubuntu 20?
I am trying to setup a host for our CloudStack test, but I cannot figure out the issue when configuring the bridged on the network with Netplan.
From the installation documentation, they show an ...
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1
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62
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Is it possible to filter local network traffic based on the URL?
What I'm planning to do is e.g. allow: https://website.com/a/ but block: https://website.com/b/.
Research on proxy servers seems like they filter based on only domain names website.com. Since most ...
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139
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Error setting up base reposotory while using pxe booting centos9 with kickstart file
I am trying to setup a PXE boot server in centos for unattended install of OS, for POC I am using a centos7 as a PXE server which is running on Citrix hypervisor, I am using a kickstart file. When I ...
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133
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Difference between modifying /etc/hosts vs using dnsmasq service
After reading the man pages of dnsmasq it seems either way it checks /etc/hosts so what exactly is the difference between adding IP: domain names in /etc/hosts and doing the same plus run dnsmasq on ...
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Best mechanism for access control to AWS / Cloud Resources for remote users
We use Cloud solutions such as AWS and Azure, so frequently access EC2 instances, AWS Workspaces etc.
These cloud resources are only accessible to a static public IP address. So our employees use ...
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113
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No network un ubuntu 22.04 after installing nVIDIA Quadro P400 card
I installed a P400 card to my server and internet connection dissapeared.
If i take this card out and reboot everything works normally.
Server recognizes network driver.
I even updated kernel to 6.7 ...
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1
answer
55
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Troubleshooting Wake-on-Lan on Dell Microplex
I am trying to get WOL working, but it simply does not help to power on my devices. Here's what I have tried:
I have a 2 PCs of different make/models connected to a Cisco Switch. Both them do not work,...
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48
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Bonding 2 interfaces on my storage with different speed
On my synology storage I have bonding option. I am not sure if it is right to do that way, so if you can help me :) So my synology have 2 ports , 1x10G and 1x1G and i am thinking to bond them. Will ...
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186
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Routing outbound traffic through multiples NAT Gateways with a single static IP address
I have an ask from an external customer that is whitelisting our NAT gateways to access their systems and their vendors systems. They said some of their vendors limit the amount of IPs they can ...
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105
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Cannot connect to server using some applications
I've been using ssh to connect to my server for weeks, but 24h ago it suddenly stopped working. The following things I tried:
When I enable VPN on my local machine I can connect
When using my phone's ...
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38
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What happens if a TCP implementation retransmits different data? [closed]
No sensible TCP implementation would do this, but does anyone know what happens in practice if a TCP endpoint retransmits different data for particular sequence numbers? I couldn't find anything in ...
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How to grant permissions, in Windows 10, to a folder in a server to a user connected to a workgroup? [closed]
I, as a network admistrator, want to grant permission to read and edit a folder and all its files to a user (another computer in the workgroup).
I tried the following: properties of said folder, ...
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1
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258
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Which LAGG type should be used for MLAG switches to CARP firewalls?
My network setup involves two firewalls in a Common Address Redundancy Protocol (CARP) group, each connected to an MLAG (Multi-Chassis Link Aggregation) configuration of Mikrotik switches. Onward ...
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Windows Cluster unable to failover
I need help on an issue I just found on a Windows Server 2016 cluster of two nodes, Server A in network 192.168.10., the other node, Server B on a different network, 192.168.20.
All the resources (six ...
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1
answer
104
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Squid's `tls_key_log` does not work as alternative to `SSLKEYLOGFILE` to decrypt TLS traffic
Following the instruction I can successfully descrypt TLS traffic in wireshark while browsing in firefox with SSLKEYLOGFILE env variable set and running squid as middle man proxy.
export SSLKEYLOGFILE=...
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4
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400
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What is the difference between NS record and SOA record in DNS entry?
I am trying to understand the difference between NS record and SOA record. As NS record is supposed to store a primary authoritative nameserver and secondary authoritative nameserver as a backup of ...
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2
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70
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Share bandwidth equally
I have a server with 100 Mbps bandwidth.
Clients with dynamic IPs could connect to web server and download large files
There are maximum 10 clients which can download simultaneously
And I guarantee 10 ...
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1
answer
125
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Localhost Connection Throttled at 1Gbps
I am using mongorestore to restore a db to a localhost server on a Windows VM
The connection uses mongodb://localhost:27017
Resource Monitor shows that the speed of the restore is limited at 1Gbps and ...
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1
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165
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Add delays to the requests coming from a particular ip address
Is there any way to add delay to the requests coming from a particular server for testing purposes. I have tried checking tc command which adds delay for all the requests. I have also checked if there ...
2
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2
answers
214
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Dell ME4084 slow speed with Intel E810 25G in Hyper-V Failover using iSCSI
PLEASE READ 3RD EDIT BELOW
I am currently trying to figure out why the following server setup is getting me only slow speeds on SMB copys.
The setup is the following:
2x Dell PowerEdge R7525 each ...
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91
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S2S VPN - cannot ping B from A until A pings B
I'm working on site-to-site VPN between 2 networks within private cloud. On both ends I installed Strongswan and established VPN connection.
The problem is that I'm not able to ping from A (10.0.1.0/...
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I am trying to run a coredns server using quic, but facing an issue?
`I am trying to run a coredns server using quic, but getting empty response.
Here is the link to the github project of coredns: https://github.com/justus237/coredns
I have created a corefile for quic ...
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Cannot Access Tomcat Server from external server
I have found several people with this problem, tried many solutions, but none have worked for me.
I have recently setup a new VPS at a hosting company, linux with Centos9.
I've installed and run ...
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150
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Create internal private network for VMs
I have a linux server with some VMs (proxmox).
Currently, they each have a public IP assigned from a rather small block, let's say 200.0.0.0/28, and I'm running out of address space for new VMs. This ...
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478
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Netplan configuration for bridge and route setup
I'm not very versed in netplan. Basic static IPs and VLANs are all I've really done.
I need to get this set of commands to persist on reboot:
ip link add loop-to-lan link eno1 type macvlan mode bridge
...
1
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1
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203
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iptables v1.8.7 (nf_tables): unknown option "-p"
Try to remove -p option, got
iptables v1.8.7 (nf_tables): unknown option "PREROUTING"
the command:
iptables -t nat -A PREROUTING -p tcp -–dport 80 -j REDIRECT –-to-port 8080
Got
iptables v1....
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1
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71
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Set a specific IP per program in CentOS
I have a VPS with multiple IPs assigned. In this VPS I run some programs that make requests on the network and, for some reason, all the requests use one specific IPv4 of my VPS.
However I have many ...
5
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2
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Thousands of incoming HEAD requests - best way to handle with EC2?
I had unusually high https traffic recently from a couple of IP address with agents masquerading as Windows clients. I blocked the range via 'deny' inside of .htaccess (Apache 2.4)
I'm still getting ...
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2
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236
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Windows AD getting hammered by unknown system, need to find out source
Mostly unmanaged network. Firewall at perimeter, Unifi Wifi. No other real visibility. Win SVR 2016.
Event viewer shows 60k+ events of entirely event id 12294:
"The SAM database was unable to ...
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125
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rp_filter was set to 1 unexpectedly on rhel 9 clones
I'm trying to setup a virtual interface, and disable its rp_filter.
For example, a virtual ethernet:
ip l a va type veth peer name vb; echo 0 > /proc/sys/net/ipv4//conf/va/rp_filter
It works fine ...
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194
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server network fails when starting k3s server
We have a k3s cluster in our staging environment with one master and two agents. Recently, I noticed that the master node was using high resources. I was also unable to SSH to the server from our ...
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254
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Forwarding requests to another Azure Container App in the same environment results in 403 forbidden
-- Copied from Stackoverflow --
I am trying to setup two containers in an Azure Container App Environment. One Container App has a Caddy reverse-proxy plus SPA app files (app-www) and another has an ...
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118
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Issue with DNS Resolution in Celery/Redis on Debian 12 - VPS Provider Specific
I'm facing a peculiar issue with DNS resolution in a Celery/Redis setup on some Debian 12 installations. It seems that the problem might also relate to the VPS network settings. I'm at a loss and ...
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Two containers on two hosts in same network: One can access other hosts on network, the other can't, why?
I have been running into a network issue recently with two containers (on two different hosts) in our network:
The container on the one host can ping/access physical hosts on a specific network while ...
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3
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No Wired Connections in Ubuntu
I recently installed Ubuntu desktop 23.04.3 on a ThinkSystem RS630 Lenvovo server.
I have connected the server to my a working ethernet cable but I get no Wired Connection options on the network ...
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62
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How to route TCP traffic through a fixed IP in Azure during local development?
Hello ServerFault Community,
I'm working through a challenge related to accessing a third-party OPC UA server and am considering a solution using Azure's cloud infrastructure.
Background
Our team ...
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76
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AWS EC2 networking
I've been trying to understand how exactly networking works for EC2 instances, more specifically I'm coming from on-prem infrastructure where I had dedicated networking devices (switches/routers) ...
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90
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Systemd networking boots with timeout
I've a Debian (installed 10, upgrade over time to 12.4) with additional Proxmox packages installed. The systems runs for several months without an issue. Every evening, it stops with rtcwake and ...
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48
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MySQL Client taking more than 14 sec to be connected
IN our on-prem server we have installed mysql 4 node cluster 2 for mgmt and 2 for datanode. All are physical server with 1TB ram and 64 core processor. When a user trying to connect to mysql server ...
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1
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72
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Multiple server processes on a Multihomed machine with one process bound to 0.0.0.0
I develop a data broker service that repeats individual device data onto multihomed IP addresses on a single interface. Each repeat server is a separate process bound to a specific TCP IP and port (e....
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396
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Wireguard VPN can't access non-standard ports
I have a Unifi UDM-SE running a Wireguard VPN server with the following configuration:
"Main" network: 10.2.1.0/24
"Main" gateway: 10.2.1.1
VPN network: 10.2.2.0/24
VPN gateway: 10....
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Windows: Can't create files on admin$ share even as administrator
Using Win10 x64 Pro.
In the past I was to be able to copy and files to \mylocalmachine\admin$ when using an account that is an administrator of the system. However, now I can only list and read files,...
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Port forwarding ubuntu server - iptables
I would like assistance in connecting to a WireGuard server that is currently being censored by my ISP. To overcome this restriction, I am attempting to set up port forwarding from my VPS to the ...
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OpenVPN connection timeout error
It's few months I'm using OpenVPN as well, but now, I get timeout error:
Any idea what's wrong and how can I fix it?
Note that, in the past I've seen this error once and by disable/enabling network ...
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1
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55
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How do I set up multiple networks to 1 computer with 4 ethernet cables with quad-nic (IS SOMETHING POSSIBLE?)
I'm not going to act like I know what I’m doing because obviously, I don’t. Complete n00b here.
So let's start with this. I have 4 networks. All 4 have their own router and switch.
Mega Computer has ...
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1
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224
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Can I connect a server with a 10G SFP+ port to a switch that only has 10G RJ45 ports?
All of our networking equipment is copper. I'm looking at buying a server but it just so happens to have a 10G SFP+ port and I'm unfamiliar with these. My understanding is that these are primarily ...
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103
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AWS instance gateway using Amazon Linux
I'm trying to create a gateway on an aws ec2 amazon linux machine so that a worker machine without access to the internet can gain access via the gateway. Then I will install a server on it and ...
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setup up ssh connection with 3 Ubuntu machines to bypass a firewall
I have 3 machines, here are the IP addresses of each of them with their ssh port :
first device IP: 192.168.1.2
second device IP" 192.168.1.3 port 22822
third device IP: 192.168.1.4 port 22
I ...
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1
answer
435
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Use Windows as a router
I need a client application to connect to a server in a different network. Another computer is connected to both networks as shown here:
Client Computer ...
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207
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How to allow access between network segments in Keenetic?
I have Keenetic Sprinter with default firmware (latest) in which I have configured 2 segments:
Home Segment 192.168.1.0, 255.255.255.0/24, DHCP enabled
IoT Segment 192.168.2.0, 255.255.255.0/24, DHCP ...