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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What settings are needed to make a FortiSwitch 148F communicate with an HP 5130 using SFP Transceivers?

I have a FortiSwitch 148F-FPOE that will not communicate with an HP 5130 Switch. I get link lights on the ForitSwitch but not the HP. The HP 5130 has a Dell-branded SFP module and the FortiSwitch has ...
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How to reset sessions in nat table?

I'm using ubuntu 18 04 with nftables like a router. Can I drop sessions in separate threads (both selectively and all)?It is necessary to reset it but not to block it
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I cannot connect with public key authenticated SSH connection to a server, the connection just gets… dropped

I set up my SSH server to accept connections with public key authentication, for the group myGroup. I created a user on the server inside this group, called myUser. Then I generated the key pair on ...
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How does a node differentiate between an IPv4 and IPv6 datagram?

In a computer network, how do hosts and routers tell if a datagram is IPv4 or IPv6? Do they just look at the version number field of the packet header?
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Nftables tproxy not working

I want to redirect all DNS traffic to proxy. For that i setup following rules in nftables: chain prerouting { type filter hook prerouting priority mangle; policy accept; udp dport ...
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Best way to establish and secure communication from multiple subnets to device behind firewall (DMZ, NAT, port forwarding?)

I'm looking for advice on how to best implement a DMZ on a FortiGate firewall (FG-F100), as in the proposed architecture drawing attached diagram. The goal is to establish a security barrier between ...
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VLSM Segmentation

I often hear that it is advisable when segmenting a network (VLSM) to have subnets that have a number of IPs that is as close as possible to the number of real machines. I understand the usefulness of ...
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Forwarding traffic over single NIC w/ multiple IPs to other IPs on separate interfaces

I'm attempting to configure a machine to act as a gateway to two captive raspberry pis. Machine A, the "gateway", has 3 NICs. Machine A's eth0 is configured w/ multiple IPs (192.168.0.5/6/7)....
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active directory Server not operational via WIFI after unplugging from Ethernet cable/patch cable

Been having issues recently where I cant seem to access ADUC on A laptop that is connected to my works wifi network with an ip of 192.168.4.89 but i was able to join the laptop to the doamin ...
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1answer
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Unable to route ports, ISP assigned private address - connection down issues every 4 hours

I have a big problem, I live in an area where there is no fiber or ADSL connection and I connect to the internet using a 4g+ sim in a 4g+ router (Tp-Link Archer MR600). The connection is just fine: ...
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kube-proxy won't start in Minikube because of permission denied issue with /proc/sys/net/netfilter/nf_conntrack_max

After updating Arch Linux (sudo pacman -Syu) and restarting the system, Minikube fails to start because of kube-proxy. The logs show it was trying to modify /proc/sys/net/netfilter/nf_conntrack_max ...
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Not connecting to Internet in windows 10 1909 [migrated]

Recently I have uninstalled my outdated escan antivirus after that I can't connect to internet. Wifi is connecting and showing internet access but my laptop is not getting the internet not by any ...
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Direct connection no longer working - how to debug

I have a hackintosh and a QNAP NAS, both with 10gbit cards in them. I set up both cards as static IP on the same sub-net (10.0.0.1 and 2) and direct connected them. All was good. Then I performed a ...
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VPC setup for (micro) services - shared vs. peering vs. one project - best practice

Somewhat related to this and this. This is a very basic and probably noob question. I want to set up a couple of services (mix of GCE, GAE, GCR and GCF) in the GCP (one org). Some of them need to ...
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Reliable transfer protocol designed for a known static bottleneck size and high packet loss?

AFAIK, most reliable transfer protocols like TCP tends to use some method (like packet loss) to detect the size of the bottleneck. In my use case, however, the bottleneck bandwidth is a known value of ...
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No network connection after fresh debian install [closed]

Today I built a new PC, installed debian, during installation it was downloading additional packages from deb.debian.org mirror, so connection to internet must have been fine, however after ...
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website slows down after NAT Gateway attached to web server subnet [closed]

When my subnet is in public subnet website works fine, but when I attach subnet to NAT route table it slows down, the website is mapped with 2 ALB's one is app.example.com and second is api.example....
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How to create LAN proxy server with traffic funneled through ssh -D

I want to create a SOCKS proxy server on my LAN, so it will be available to all users on wifi. My goal is to funnel all the traffic from the SOCKS port on the lan server through a ssh -D connection. I ...
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tun0 interface (created by opevpn) only useable as root

If I do curl ipinfo.io --interface tun0, it will hang forever. but if I do sudo curl ipinfo.io --interface tun0, it will work as expected. How can i make tun0 useable by non root users? tun0 is ...
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Azure Virtual Machine Scale Set - Networking per Virtual Machine instance

If you were to create a Virtual Machine Scale Set in Azure, with one NIC attached to it, will this same NIC be used for all of the Virtual Machine instances in the Virtual Machine Scale Set, so that ...
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1answer
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trying to setup ip addresses on my network

Here's my schema. I'm trying to set up IP addresses to be able to PING from the first floor ( etage 1 ) to the second ( etage 2). I tried setting up an IP address 192.168.233.2/24 with the gateway 192....
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iptables forwarding internal traffic to one ip to another

is it possible with iptables to forward internal requests on one ip to another? As a example: A hardcoded tool is requesting content from 10.0.0.10 on different ports, the Author of this tool stopped ...
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1answer
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Azure outbound IP

In Azure, if I were to deploy a Virtual Machine it would "out of the box" have outbound internet connectivity. Is the assumption that the public IP, for the outbound connections of this ...
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Some advanced IPTables routing

I'm trying to route some public and private IP addresses using Ubuntu Server 18.04 using iptables. Please note: I've changed the first bits of my IP Address for privacy, but kept it numerical for ...
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Linux network configuration: multihomed server + monohomed one

I have an issue that i'm sure it comes from Linux configuration. Here is the little infra (it is setup on Azure): I want to be able to ping 192.168.2.21 from 192.168.4.10, but i never received the ...
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3 Lans adapters do not work, but 2 work

I have bought a new motherboard with a build in LAN [1]. When I add one of those [2], everything works fine, but when I add one more [2] all Lan adapters stops to work. When I am with the 3 Lans, on ...
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What is the name of an IP prefix with prefix length 31? (i.e. contains only 2 IP addresses)

At my job, IP prefixes with prefix length 31 (i.e. they only fit 2 IP addresses) are commonly described at "linknet addresses". Lately I have noticed that this term doesn't appear to exist ...
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In Netscaler, can IP addresses be configured to target a certain route before hitting the web?

Within Netscaler, is there a way to view/configure an incoming IP traffic to travel through a certain route/system, before hitting the web? Besides the web browser's Internet Option Security LAN ...
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39 views

Windows does not respond to IP

I currently have the following problem: We currently have a cloud server configured to accept connections via a remote Site to Site tunnel. The connection is established, and the traffic from the ...
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How to connect a different physical interface to the VPN tun0?

I'd like to allow a computer connected to a physical interface to be directly connected to the VPN. Routing mode VPN network: 172.16.0.0/24 internal LAN: 192.168.0.1/24 (irrelevant?) With the ...
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1answer
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DKIM Validating Signature, Result = Fail Details: Body Has Been Altered

I have 2 mail server, Main Mail Server = Microsoft Exchange Server Secondary Mail Server = Ubuntu Postfix only as SMTP Relay. The Exchange Server is using Ubuntu Postfix SMTP as Smarthost, And the ...
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Is there a way to hide a local IP address from an executable?

My Windows server has 2 IP addresses assigned to it. Is there a way to hide one of the IP addresses from an executable (windows service in this case)? The reason is that this application takes ...
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Make Windows listen on specific IP

I currently have the following problem: We currently have a cloud server configured to accept connections via a remote Site to Site tunnel. The connection is established, and the traffic from the ...
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0answers
33 views

Influence source address selection to same destination with multiple interfaces

I have a system with two network interfaces, both connecting to same default gateway. I want to load balance the connections to the same destination IP made from the system across both interfaces and ...
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Packstack installation error:Error appeared during Puppet run: 182.200.101.182_network.pp

I'm trying to install openstack pike and get the following error: Applying 182.200.101.182_network.pp 182.200.101.182_network.pp: [ ERROR ] Applying Puppet manifests ...
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1answer
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Observing conflict on VPN when multiple users on same network attempt to connect and access EC2 Instance behind security group

We have external services that are behind an Amazon EC2 security group, users connect to a VPN (this is supplied and maintained by a third party) so that they are given an IP that is consistent over ...
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Is there a way to have another machine relay *specific* network traffic as if the request was from itself?

I have a local network on a 192.0.0.0/8 range, both a laptop and a PC are connected to this network. There is also a VPN network that only the laptop has access to, this is a business network with a ...
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1answer
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ICMP reply packets not received by original pinger via gateway

I have been unable to get ICMP response packet to come back to the original pinger. Right now I have the following tcpdump on the VPN server (which is the gateway as well): ## VPN server (10.131.102....
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Pure Object serving over Network

(Originally posted on StackOverflow) I would like to know what variables one has to consider when comparing different storage systems in terms of time performance for serving an object. Assume the ...
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1answer
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Incorporating a DMZ within a multiple VLAN setup built around a HP Procurve 2824 switch

I am a n00b to networking and I need help trying to figure out the steps I need to setup my topology. I have the following requirements: (1) A Secure VPN which will be my Primary LAN network where all ...
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SSH fragments packets over wrong mtu

I have this configuration: HOST-A <---> GAT-A <---> MiTM <---> GAT-B <---> HOST-B I'm doing a security project on MTU-IPsec vulnerabilities and following this guide of Hal-...
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1answer
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Secure server accessing R repository

Disclaimer: Please forgive my complete ignorance and lack of knowledge with this subject. I am not an IT professional nor do I have experience with secure networks/servers or R. I just happen to be ...
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Slow file transfer speed between clients and Debian VM on Hyper-V

I have been using a Raspberry Pi as a web server for the last few years. However, I now need something more powerful so I created a Virtual Machine running Raspbian Desktop on Windows Server 2019 ...
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How can I ensure that my home LAN is not affected by my cable modem's outage [migrated]

As probably with most of the world, my cable modem experiences downtime intermittently each day (for maybe several minutes). The problem is, I use my cable modem for DHCP - I have a switch connected ...
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Can't connect with wireless [closed]

I have trouble connecting using a wireless RALINK 802.11 nWLAN. I made a screen shot of service network manager status. The system is Kali Linux. Any help appreciated.
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Why would a particular network card only work with certain IP blocks?

I have a proxmox (debian based) cluster and there are 4 network ports in the nodes, two 10GbE ports and two 1Gbs. One node is behaving in a way I can't explain. When I set a 172.16.0.0/29 block ip ...
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Unknown private IP addresses tried to log in to my router's admin panel

I noticed some weird traffic in my router's admin panel logs: 2021-03-25 06:27:19 [Critical][Config-Log] Terminal:WEB(10.181.189.71),Result:Fail,Type:Login,Username:- 2021-03-25 06:27:22 [Critical][...
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1answer
72 views

GRE tunneling using Open vSwitch

I am trying to implement tunneling as described here with the following setup (without any success): ho1 is a host only interface. I want to connect Nested Guest 11 and Nested Guest 21. I have read ...
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Safari search bar and redirection [closed]

I am working on an offline AP (access point) and I am redirecting all 80 port requests to a single IP address. Problem is, I am a newby and I have no idea how the search bar in a browser works... If i ...
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1answer
43 views

How to route openvpn traffic through a second network adapter, to access the internet

I am running an ubuntu server with two network adapters eth0 and usb0, both with separate internet connections. The openvpn server is listening on eth0, and client can connect to the vpn using the ...

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