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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WERR_ACCESS_DENIED - While rebooting Windows with Linux over LAN

We recently lost one of our Windows 2K8 servers while switching from Static to DHCP after a DHCP release command was inadvertently called. The server was still active but we were no longer aware of ...
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Docker networking suddenly fails after I did “docker system prune”

I have a docker-compose.yml file that I have been using for months. Yesterday, for some oddball reason, I decided to do docker system prune. Now, when I try to do docker-compose up -d, I now get ...
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Equivalent to TYPE=“OVSPort” DEVICETYPE=“ovs” OVS_BRIDGE=br-ex in Ubuntu 14.04?

Is there an equivalent to TYPE="OVSPort" DEVICETYPE="ovs" OVS_BRIDGE=br-ex in Ubuntu 14.04? The system is OpenStack Icehouse with 3 nodes (controller, network, compute1) each on a VirtualBox Ubuntu ...
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Centos 7: Cannot curl localhost nor internal IP : no route to host

Centos 7, lamp stack. ​ firewall is turned off, sealinux is disabled, Iptables looks fine ​ if you to localhost/api.php or internal-ip/api.php from a browser, it works fine, if you ping it's fine, if ...
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Cannot set MTU for Network interface in FreeNAS-11.3-U3.2 Web Interface

I'm trying to set the MTU value for my network interface in FreeNAS-11.3-U3.2 to 9000. However, when I select the interface to EDIT in the WebUI, enter 9000 for the MTU field, then click "APPLY&...
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Docker - how to forward requests on container port to the host port?

I have 2 services running on docker. They communicate with each other using exposed ports on the host machine. Service A listens on host port 4000 (using host: localhost) I want Service B to send ...
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System resume kills wpa_supplicant

Using debian distros for a few years. All distros from the last few years seem to share a wierd wpa_supplicant issue. Has anyone else attempted to solve/understand this issue during sleep/resume? ...
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No Internet access after successful failover?

I am using pfSense 2.0.2 and want to set up a failover between my normal WAN connection (GW_WAN) and a 3G surfstick (GW_OPT8). I put both in a gateway group called WAN_FAILOVER: GW_WAN Tier1 (...
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2answers
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Does broadcast address work over internet?

I have a subnet /24 (256 public IP addresses). Currently, I assign IP .255 to an LXD container (ubuntu) and it seems working normally. I wonder if someone sends a UDP message to the host that has IP ....
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613 views

VRF-like multiple routing tables on Windows

Does modern Windows kernel support some kind of VRF-like (or Linux network namespaces) multiple routing tables? I am considering a Windows server with 5 NICs. Every NIC attached to its own VRF ...
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How to uninstall shorewall completely from Ubuntu

I noticed on my some servers shorewall service is installed but it's not running.I want to uninstall it. I executed the command sudo systemctl status shorewall to check status of shorewall and got the ...
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1answer
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Blocking new devices on a network

My university has implemented a strict new network policy, which we are generally told is "restricted unless permitted" whereas previously it was "permitted unless restricted". For ...
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1answer
390 views

Why is networkd changing the MAC addresses of my bonded interfaces?

When I add the config files below into /etc/systemd/network and restart systemd-networkd, I find that the MAC addresses of bond0, eth0 and eth2 have all been changed to a single, locally administered ...
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Finding a solution to a Network programming issue [closed]

I have a question how can i implement such a solution for this problem : there is a program which it must be run in a shell, as for example: PROGNAME ifs=[IF-LIST] ./desiredprogram ifs=eth01,eth02,...
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Redirect a subdomain DNS entry to an internal IP via router and server

I'm hoping someone here can help, firstly, apologies, I am not entirely familiar with networking protocols but I'll try explain as best I can. I have Jitsi video conferencing, installed on an internal ...
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is “ip route list | grep docker0” a reliable way to get the docker host ip?

I'm using this code to inject the docker host ip into my container. It seems to work but I'm not sure exactly what ip route list does and if this will work on other environments and if the ip param ...
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10answers
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Docker containers can't resolve DNS on Ubuntu 14.04 Desktop Host

I'm running into a problem with my Docker containers on Ubuntu 14.04 LTS. Docker worked fine for two days, and then suddenly I lost all network connectivity inside my containers. The error output ...
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1answer
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Packets taking DNAT rule to local IP disappearing

I've been dealing with quite an odd issue for about the past week now, and I'm wondering if anyone had any advice to continue debugging. We have a machine with two ethernet interfaces, one of which ...
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Suppressing ICMP protocol 47 unreachable with userspace GRE implementation

For reasons that would require a lot of irrelevant context to explain, I'm handling GRE packets with a userspace process with a SOCK_RAW/IPPROTO_GRE socket. This is working fine, except that despite ...
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1answer
38 views

Options to forward vm to internet via ssh tunnel

Want to give vm in qemu/kvm internet access but only via a port i can forward to ssh tunnel. qemu -> host (already established) ssh tunnel on port 8083 -> ssh proxy -> www ports for browsers ...
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Making service listen on pptpd localip in Ubuntu Server

I put the following two lines in /etc/pptpd.conf: localip 10.10.10.10 remoteip 10.10.10.100-200 Then I type service pptpd restart. I'm able to connect to the PPTP server from an external client. Here ...
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8answers
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How does IPv4 Subnetting Work?

This is a Canonical Question about IPv4 Subnets. Related: How does IPv6 subnetting work and how does it differ from IPv4 subnetting? How does Subnetting Work, and How do you do it by ...
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How to Configure eth0 in kali linux? [closed]

How to configure eth0 in kali linux. I've tried configuring eth0 through ifconfig command and it also worked but when I rebooted my computer the changes reverted back to there previous state. Please ...
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802.1x RADIUS Clients not receiving Access-Accept

I'm running Network Policy Server on a Windows Server with the latest updates. The authentication method is PEAP with MS-CHAP-v2. A few weeks ago, everything was working fine but now our wireless ...
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ESXi network behavior host losing connection to LAN

I have an esxi host with 2 virtual machine, if i switch on both VMs my host loses connectivity to the LAN but sill pinglable from the VMs. If i switch off one of the VMs, my Host is pingable from LAN ...
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Mikrotik, ping from Lan1 to Lan2 in LoadSharing

I've set up the Mikrotik with 2 ISPs on Eth2 and Eth3, and 2 Lans on Eth5 (10.200.20.0/24) and Eth6 (10.200.21.0/24). Lan1 reaches internet over ISP1 and Lan2 over ISP2. From both Lans I can ping the ...
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Wireguard setup not working

I would like to setup a VPN Server using Wireguard. Therefor I have followed this post: https://nachtsieb.de/2019-03-21-wireguard-vpn-server.html. Sadly I was not able to make the server work. Here is ...
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2answers
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Proxmox private network between KVM and VZ

Sorry for asking this eventually trivial question, but I'm fighting with this for more than a day, and was unable to figure this out by myself so far. Situation Proxmox host running a bunch of ...
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1answer
37 views

Cannot connect to VPN server [closed]

I'm running ubuntu linux on which I try to connect to openvpn server. I tried network gui and also connect from command line, but I always get this error: /sbin/ip route add 10.0.8.9/32 via 192.168.8....
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Network Consolidation of DHCP Clustering 2016 in Multi-site

May I know any latency limitation between two DHCP servers replication, which will be formed DHCP clustering? I cannot see any Microsoft's official documentation for this topic. Please advice. E.g. 1 ...
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2answers
182 views

How do I use podman to put an entire zookeeper ensemble in a pod?

For testing reasons, I would like, as an ordinary user, to create an entire zookeeper ensemble in a pod where all the individual zookeepers can talk to eachother. As far as I can tell, either all the ...
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gmod server connection to aws sslh server not working

i have a local gmod server with a AWS sslh server forwarding the connection. I cant connect to the server via the sslh server my connection looks like this local server<=====>aws sslh server<=...
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1answer
41 views

Azure: whats the difference between “Reserved IP Address” and “Public IP Address”

Whats the difference between these two resource types, and which should I create? My scenario is I need to setup an unknown number of jmeter load test servers (which will be linux VMs which I manually ...
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2answers
2k views

How to know the external ip address of my gateway?

In my office network i unknowingly changed a setting of my gateway of lan network .. I had set my phone's ip address under a section in setting which states that.. Only this ip can login to the ...
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3answers
11k views

How to request/acquire all records from a DNS?

I want to see what nodes exist under a certain domain from within the domain. Short of querying every valid IP address within that domain, is there a way to get all records/map the network?
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19 views

VM inside an Esxi host does not have Internet access

I have installed an ESXi 6.7 host inside a VMware Workstation. That ESXi has one VM Ubuntu 20 server running. But that VM does not have internet access. Here are the network settings: ESXi host is ...
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27 views

Rest api call taking 50 seconds on the client's server, but on ours it takes milliseconds

We have a lamp stack. In our office, the code is deployed on a centos 6, we get a response after 1612ms and everything is good. We deploy the code to our client who's using centos 7. Postman response ...
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Why multicast UDP can be slower than unicast UDP?

I have two machines (with Centos 7.3 on both) connected via 1G switch. When I measure UDP thoughput between macines with iperf it gives about 850 Mbit/s. However when I measure multicast UDP thoughput ...
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1answer
10k views

SNMP differences in ifInOctets vs ifHCInOctets values

I'm trying to graph network usage on my router for a specific interface using data from SNMP. I know that ifInOctets/ifOutOctets is only 32 bit and will overflow for high speeds and make my graphs ...
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1answer
24 views

Azure: whats the difference between “basic” and “standard” SKU for public IP, and which should I Chose? [closed]

to create a public IP for a server, so it can "see" the outside world, and so I can SSH to it, I need to create a static ip. This can be "standard" or "Basic". What is ...
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2answers
32 views

Identifying a connection after SNAT

Hi I have a problem statement that I am trying to solve from quite a while now. Problem Statement (This is a networking scenario): Machine A and Machine B want to connect to Machine D, Machine C being ...
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0answers
30 views

Raspberry as network gateway [closed]

I'm trying to setup a mini gateway with a Raspberry connected to a DSL Router and an Android Hotspot. Here is the schema: network I have a network 192.168.178.0/24 on the DSL router I have a network ...
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1answer
33 views

aws - can I configure ip allow rules for a specific endpoint

My Config is a single EC2 instance. I'm new to aws and inherited this architecture. We want to create an endpoint that will be accessible only from the office (specific IP). What is the best way to ...
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3answers
57k views

How to forward port 80 to another port on the samemachine?

How can I forward requests coming in on port 80 to another port on the same linux machine? I used to do this by changing nat.conf, but this machine that I'm using doesn't have NAT. What's the ...
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1answer
1k views

redirect traffic from 127.0.0.1:5003 to external interface

I have an application that exposes Web Services on the loopback address 127.0.0.1:5003 so they are only available to the localhost. Is it possible to redirect traffic from there to the external ...
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3answers
45 views

Sending files via FTP without IP addresses on PC's [closed]

Can two PC's communicate with each other - FTP, without using IP addresses(entirely skipping Network Layer)? I know, FTP is client-server architecture, but I wonder if LAN network and MAC addresses ...
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1answer
46 views

why linux host do not contain ip after add bridge network with kvm virtual machine [closed]

After I join the bridge network br0 in my Fedora 32 workstation machine, my host machine config look like this using ifconfig: [dolphin@MiWiFi-R4CM-srv .ssh]$ ifconfig br0: flags=4163<UP,BROADCAST,...
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1answer
2k views

yellow exclamation mark on the network connection

Ok here is the scenario. A couple of days ago our firewall (a domain joined TMG also configured for NAT and VPN gateway) server got compromised. As a result, it was taken down immediately and replaced ...
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1answer
1k views

Permanently assigning IP address for an embedded device

This is a follow-up to Embedded device configured with bad IP address, can I still connect? We make embedded devices that run Linux. Users can change the networking configuration of the device (...
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0answers
16 views

Can't connect to SSH on private IP through VPN gateway [closed]

Morning, everyone, I've been having a strange problem for a few hours. I was SSH connected on my Azure virtual machine and my SSH connection suddenly froze (without disconnecting). I closed my shell ...

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