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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13 views

Best way to connect two separate docker networks

I am looking for the best method to connect two different Docker containers (ie allow them to ping eachother) that are on different networks. I have a WireGuard container that's connected to wg-net ...
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1answer
29 views

Limit network bandwidth on fixed rate for all connections/users

I am looking for the commands in Linux to limit the rate of upload/download for all users to the fixed rate. I have three Linux commands that limit the network rate on OS. tc qdisc add dev eth0 root ...
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impact on I/O using the same NIC for backup

I have a one node Ganeti cluster with KVM hypervisor with multiple VM's, one of them is backup VM with one NIC, which runs a backup software to make backups of other VM's and my own notebook. The ...
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Assigning of IP address to resources by Kubernetes

I have a Kubernetes cluster in AWS, in a VPC. I have 3 private subnets and 3 public subnets which I have assigned to my Cluster. The CIDR for my VPC and Subnets are 10.0.0.0/16 and 10.0.0-6.0/24 for ...
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Add a linux network bridge device between untagged VLAN1 and tagged VLAN100

I want to add a network bridge between a tagged vlan device and the untagged vlan1. That doesn't work as I expected it to work. First I want to show the configuration of the network as it is at the ...
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1answer
34 views

KVM - Can't ping from physical network to virtual gateway

Consider the following diagram: This is the SERVER01 NIC's configuration: 2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether d4:ae:52:...
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33 views

Cannot access HTTP inside other LXC container on the same host

I'm using LXC to host a few of my services. One of them - say, container A, is an nginx working as a reverse proxy. Another one, let's call it B, is a service that needs to access container A via the ...
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17 views

Forward traffic between 2 network interfaces in one Laptop [on hold]

I have an ethernet module (a sensor but communicating via ethernet: TCP/IP) connecting to my laptop (x1 carbon). An android device (Pixel XL) in USB tethering mode connecting to my Laptop. enter ...
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17 views

How does IP address of a windows server in a DMZ look like?

I'm a complete newb when it comes to networking, I'm a .NET developer and I have hosted an application in Azure, I need this application to communicate with another application that is hosted in a ...
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20 views

How to access docker web interface from host?

My home server is running Ubuntu (with the Desktop Environment installed). It hosts several docker containers for some services that are managed by web interface (Transmission, Sickrage, Openhab, ...
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37 views

I fail to configure Pf of OpenBSD gateway

I have an OpenBSD server that I want to use as a gateway. OBSD server has the following interfaces - em5 (130...** ext.IP with internet connectivity) em0 (internal IP - 172.16.0.0/17) My default ...
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2answers
52 views

How can I fake my IP address for local applications?

I tried searching for how to do this but either my google-foo is not up to snuff, or it is simply not asked. I have a 3rd party application that I need to install on a computer in a private network. ...
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8 views

Route UDP Packets on a proxy gateway

I have the following network topology: N devices in the network, one is a gateway. All of them are in the same network. My goal is to use one device as a proxy for UDP packets. for example i will ...
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16 views

How to exclude Hyper-V switch from Network Location Awareness

I'm running Windows 10 Pro (1903) with the Hyper-V role. I need an Internal network switch so I can community from my host to my VM with static IPs. The "Default Switch" Hyper-V adds changes its IP ...
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16 views

My server occasionally loses ability to ping (and site goes down)

I am running Nginx on Ubuntu (digitalocean) to host a wordpress site. Every now and again the site will completely go down (500 error) and when I ssh into the server (which I can do) to check it out I ...
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1answer
22 views

Backup routes with linux routers

I have some servers at OVH. OVH provides a service called Vrack to connect your servers to a VLAN. I have created 5 VLANs and i'd like those VLANs to communicate. Since OVH does not provide routers to ...
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21 views

What happens when a loopback interface is misconfigured as Class-C IP?

A rogue server was found to answer each and every ARP requests, effectually blocking any new hosts to join the broadcast domain (192.168/16) of its ethernet interface. Later it was found that the ...
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14 views

tcpreplay occupies 100% CPU

I am processing a pcap file of size 1GB using a tcpreplay command to check for any malicious traffic or not. The command takes more than 5 hours even though the system has plenty of cores and RAM. ...
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84 views

Connection issues on one IP but not another on the same host/nic

I'm debugging an issue where some http requests randomly take longer times than normally. (Normal being a few ms, abnormally being 1000ms up to a minute or more) The host has several IP's and the ...
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1answer
63 views

Hyper-V Connecting to host to VM w/ External Switch

TL;DR - the short question: Can a host be configured to be able connect to a VM being hosted by the host itself, when the VM is set to use an External Virtual Switch with the Allow management ...
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31 views

Path MTU is not always 9000, only in one direction

I have a question about MTU or path MTU. In my setup I have 2 computers (firewall, Windows PC) and one NAS, each with a gigabit interface. They are connected throughout the same gigabit switch. In all ...
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19 views

pfSense multi site-to-site vpn with ipsec pointing same local network

I've an ipsec working on my pfsense with this configuration. Sites and subnets: Site A: 10.1.0.0/16 Linking sites: Site A (Server) < 10.0.2.150/32 > (Client) Site b (Server) < 10.0.15.130/32 ...
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1answer
16 views

Kubernetes bridging between VM host network and Cluster

I'm pretty new to Kubernetes and was exploring Services to try and access my application running inside a MiniKube. This just a default HTTP server that responds with Hello World. Now I know about ...
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1answer
60 views

UDP is received, but TCP is not

I have two types of software connected to the internet - both HAVE to be continuously connected. One connects via UDP protocol and I have no dropouts. The other maintains its connection through a TCP ...
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2answers
32 views

Check if a remote machine is running

I want to connect to 2 machines remotely. For doing that I should first make sure that both the machines are running. One way to do this is by using ping which might not work sometimes because of the ...
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30 views

Two eth devices, two subnets, pfsense and VM

From my laptop in 192.168.1.0/24 network I am able to ping a host (VM) in 192.168.2.0/24 network but I am unable to ping the same host (VM) using its second ethernet device in 192.168.100.0/24 network....
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1answer
86 views

IPTables block internal traffic but allow all outgoing traffic

I'm trying to do the following: Block all internal traffic Allow access to ports 81, 82 only if IP is X.X.X.X Allow all traffic out including port 22 I think I got it working BUT now I can't ...
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31 views

Default gateway changes after network/system reboot

I have the problem that my server does not take over my gateway (10.0.0.1) from the configuration "/etc/network/interfaces". After a restart it always changes to the old gateway (192.168.178.1) I had ...
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3answers
67 views

In IPv4 Subnets - a /23 - How do we know which range to use? [duplicate]

Let's assume I don't know what my IP range is, or my default gateway, but I know my IP address is 192.168.5.38 and my CIDR Range is /23. How do I know what my IP range is? Is my range 192.168.4.0-...
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1answer
64 views

Hyper-V: after external switch setup - host lose internet in browser (but I still connected to it) [on hold]

I have a dedicated server with Windows 10 - far away from me, in datacenter. I create external switch in Hyper-V to connect my VMs to Internet with "white" IPs. I attach it to NIC with internet (...
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3answers
50 views

Does ping <hostname> only search on same subnet?

I'm with tech support and he's trying to ping our server (on my machine through teamviewer). I assume he thinks the two machines are on the same subnet because he uses ping <hostname> when it is ...
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1answer
38 views

vnstat reporting different data usage than provider

I'm using vnstat 1.11 on an older Ubuntu 14.04 server. My hosting provider gives me a monthly metered bill for the combine up- and download data. I'm trying to get a better sense of what the balance ...
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14 views

Ip forwarding and redirection - mac os x

My setup is as follows: (Internet)<->en0:192.168.101.15 (macos) en6:10.22.5.15 <-> (LAN) I am trying to make my LAN see the Internet. I already tried things like pfctl with nating and ...
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1answer
50 views

Cisco AnyConnect weird interaction with ethernet (DNS?)

We use Cisco AnyConnect Secure Mobility Client (Version 4.7.01076) at our company. Often in the morning after starting the AnyConnect client, I get a weird state with DNS on my setup. The most user ...
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36 views

Resolving DNS with 2 IPs at different networks

We got 2 servers ServerA and ServerB. ServerA is on network 10.0.0.0/24 ServerB is on network 10.20.0.0/24 ServerB has a Point2Site VPN connected on ServerA network, the VPN subnet is 172.16.0.0/24 ...
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1answer
33 views

Internal network access to public URLs does not work - slow / sometimes works

Hello. I have been having trouble with accessing my websites / services from within the internal network that hosts them by using FQDNs aka on VM with IP 10.0.0.5 go to Jira server from the browser ...
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36 views

Protecting several web servers with mod_security and Apache

I have several web servers in my network and I want to protect them all with mod_security. Most of these web servers are Microsoft IIS and a few are Nginx. I want to protect them all with only one ...
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18 views

QLogic 12300 :: Can't use more than 6 ports

I have 2 QLogic 12300 InfiniBand switches (12300-BS01) with 36 ports. For some strange reason I am unable to connect anything to ports 7-36, it seems that only ports 1-6 are working. I Googled and ...
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45 views

I want to add wan pppoe in linksys x3500 using telnet

i successfully added atm by this command: wan add interface atm 0.0.100 --linktype EoA and when i add pppoe using this command wan add service atm0/(0_0_100) --protocol pppoe --igmp enable --...
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20 views

Ping is not answered on my server but on the backup in same network

I have two servers running on Ubuntu. Both are connected to the internet with a pfSense which also provides a VPN. Problem: I can ping the backup but not the main. I can also not open ssh or any ...
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17 views

How to only start network interface when usb-stick is connected? [migrated]

I have a tinkerboard setup, that it start its network configuration on startup, and opens a bridge. Now I need a setup, where the wlan only boots, when i connect an external device. Preferably if a ...
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11 views

Can G.hn / HomePlug AV2 powerline adapters act as repeaters? [migrated]

Does either the G.hn or the HomePlug AV2 standard allow for powerline adapters to act as repeaters for each other? I want to connect two rooms (call them rooms A and C) at the far ends of a building ...
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20 views

Traceroute: request timed out messages between source and destination on different subnets

I am administering a network with two subnets: 192.168.1.0/24 and 192.168.2.0/24. Routing is enabled between the two subnets using a router with interfaces of 192.168.1.1 and 192.168.2.1. I am ...
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23 views

SmartOS can't ping any ip that resolves to failover ip

Our server is running SmartOS, we have 2 network cards one for internal use (10.x.x.x) and one external, i am able to ping any website / service except domains that resolve to our Failover IP (The IP ...
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2answers
664 views

Accessing a Localhost Service from Inside a Docker Container

I have a service bound to a localhost which I would like to be able to access from inside a Docker container. Relevant netstat output: (The service is on port 1143) $ netstat -tulpn Proto Recv-Q Send-...
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1answer
45 views

In kubernetes whitelist ip from pod in other pod

I have a REST-api in one pod that needs to whitelist all hostnames or ips that connects to it. In another deployment/pod I have my own kotlin program that tries to connect to the REST-api Both ...
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2answers
21 views

2 Hyper-V VMs in separate Hosts connected to each other through secondary NICs on each host

So, I have two host servers each with an integrated NIC and then another 4-port NIC. Host A is running the primary copy of a VM and host B is running its redundant copy. the redundancy is done at the ...
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1answer
47 views

What is the correct syntax for a multi-network multi-host Vagrantfile?

I'm trying to create several hosts that have multiple networks along with the term define. I do not know Ruby and I'm not sure what is wrong with this syntax. Can someone please offer some advice ...
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2answers
60 views

Using a multi-hop ssh tunnel to reach a database

We have some remoteservers which are only accessible through a jumphost. On this remoteservers run vms which host the databases i want to reach locally. Each box is a linux system. I have only su ...
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25 views

How to force the use of an ip of my server [duplicate]

How to force the use of an ip of my server eth0:1, if my server interoge example google.com when i use my php scripts, the ip that google must see is eth0:1 # The primary network interface auto eth0 ...