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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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Limiting network logins to local subnet windows server 2008 r2

I have an internet facing Windows Server 2008 R2 install. Lets say it's on 70.0.0.74. On 70.0.0.73 is our NAT/firewall that hands out IP addresses from 192.168.1.XXX. I want to be configure the ...
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1answer
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Using GCP's Cloud VPN and App Engine to connect to a Digital Ocean database

Can I setup a Cloud VPN and have app engine talk to a database of mine on a Digital Ocean server? I was reading the docs here https://cloud.google.com/vpc/docs/private-access-options, and it doesn't ...
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1answer
33 views

container cannnot connect to service from another container

I have the following containers running: $ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS ...
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1answer
32 views

iptables rejects vpn client by port

Here is my iptables commands: sudo iptables -F sudo iptables -A INPUT -p tcp -s 109.123.74.85 --dport 27000 -j ACCEPT sudo iptables -A INPUT -p tcp -s 188.170.80.4 --dport 27000 -j ACCEPT sudo ...
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Microsoft tool to see Windows TCP internals (congestion window, etc)

I hope this isn't too vague a question: I remember a tool from Microsoft that was able to show me all kinds of internal TCP variables, like congestion window, etc. I remember that I needed to ...
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23 views

Windows Network Card Initialization

I have a system in which 2 computers communicate via Ethernet point-to-point. When system 1 boots, system 2 is initially off. The IP address of system 1 has been set. Of course, since system 2 is ...
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Nmap scanning all ports and getting data from all [on hold]

So when i execute -sn i get a response from all 256 ports that tey are up and that is not true. i installed zenmap on my pc (windows) rang the same nmap -sn 192.168.1.0/24 and got restonse just from 6 ...
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1answer
18 views

bond interface answering for another one

I have a ubuntu 18 server with 4 active NICs. The setup is: 1. one public (not relevant for this case) 2. one single eno1 with ip 10.123.10.21 3. one bond0 (LACP bond consisting of eno3 and eno4), ip ...
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3answers
24 views

Is it possible to have same MAC address on multiple NICs plugged to same Linux computer?

Can I have multiple NICs in one computer, having same MAC address? OS - Ubuntu Linux. Thanks
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1answer
17 views

Cloud (central) based VPN options?

I have a server at a site where I cant use port forwarding due to network NAT'ting. I have to access this server remotely, so I was thinking about using a cloud based VPN? Connect my server to the ...
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1answer
58 views

From specific source IP to specific destination IP with ip route or ip tables

Problem I've already created different IP aliases, (each with a different virtual Mac Address too) this way on my shell: ip link add link eth0 address 00:11:11:11:11:11 eth0.1 type macvlan ifconfig ...
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How to access container IP from host [on hold]

Let's say I have a docker container running a web application inside docker container on port 8080. I have not mapped the ports (at docker run did not do -p 8080:8080) Container's IP is 172.17.0.2 ...
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2answers
57 views

Small ISP asked to whitelist all of their IPs

We are running a dedicated server as a shared hosting for ~100 clients. This week, a small ISP asked use to whitelist the range of their IPs because all of his clients can't see our websites. I'm ...
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1answer
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Having two connections with different IP blocks (One is Global Protect VPN)

I have a wifi connection on a windows 10 Machine. It has the following conf DEFAULT LOCAL SETTINGS IP: 162.168.0.10 Subnet mask: 255.255.255.0 Default GW: 192.168.0.1 When I connected to a VPN ...
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1answer
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NMap Topologie missing Switches (no kind of Topology)

I did scan some of our Networks but for any reason NMap doesnt applies any kind of topologie. It seems like there is everything connected directly but there are switches in between and those ...
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30 views

Azure Networking [closed]

Let's say I have 20 locations located all over the U.S, specifically the higher populated metro areas. Is it best practice to connect these locations to the closest Azure Region and then have ...
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1answer
38 views

Can user credentials from HTTP session be seen through Wireshark? [duplicate]

Can we get that info the same way we do for FTP since HTTP is a plain text protocol?
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19 views

How to set a dns hostname on an interface in linux VM

I need to run Apache Cassandra on an interface such that, change in IP address does not affect my Cassandra server. I intend to set my seed node as a DNS hostname on the interface such that Cassandra ...
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How can I route public external traffic to consul?

I've setup consul, and can now internaly resolve service hostnames to the appropriate IP. For example: dig @127.0.0.1 -p 8600 tickethub.service.consul ; <<>> DiG 9.12.3-P1 <<>&...
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0answers
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Multiple global IPv6 prefixes

I'm planning an IPv6 mesh-network with multiple gateways (routers to the internet). The connection between the gateways is not that great. The plan is that every gateway should announce two prefixes: ...
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2answers
42 views

How to get an access from external ip to internal ip using NGINX on GCP?

I can't connect to an application through an External IP. I started a gerrit code review application on a GCP's Compute Engine instance (with CentOS 7). It works on a console, by curl http://...
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1answer
21 views

Routing between two networks connected via VPN on linux

I have a following problem that I can't find a solution for. I have the following setup Private LAN -> Mikrotik router <-> ip2lt vpn on linux <-> clients The idea is to allow clients to ...
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12 views

Hosts can't ping when ICMPv4 flow has been made

I'm using OpenDayLight to be OpenFlow controller, i have 2 hosts that connect to the OpenFlow-enabled router (wr1043ndv4), the controller works fine to see the topology inventory, but when i want to ...
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1answer
16 views

WDS slow install using private Subnet

I've have an Microsoft WDS server with 2 network interfaces. Primary Network interface to be used by management, it's the main one with an standard configuration (routing,dns and connected to Active ...
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0answers
8 views

OpenVpn multiple client proxy

I admit that I have almost no clue but what I want to achieve is something like this scheme So the system (docker container or machine) would be responsible for managing open vpn profile tunnels ...
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0answers
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Accessing Clients Behind DD-WRT VPN Client

I'm trying to set up VPN access to a handful of computers at our lab. File management, checking tests, etc. The building we lease doesn't allow us to port forward anything, so we've setup an OpenVPN ...
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44 views

Dual NIC on Busybox: How to set up a global default gateway bound to just one of the NICs?

I have a network appliance based on Busybox (on a Zynq device), and it has two NICs. One network has access to the internet, while the other is private. Both have DHCP, so both are reporting ...
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0answers
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Mixed network BeeGFS

I'm working to develop a new higher-performance file server infrastructure. We are limited to 10Gb for the data delivery to users, but would like to use a data-mirrored SAN for redundancy. We would ...
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0answers
25 views

If I had 2 Servers, both running the same application and port, on the same network, how would that be possible? [closed]

Say my network has 2 servers Those 2 servers have the same instance, lets say, a minecraft server, both running on port 25565 Say I want to connect to a server, and i go and connect to myserver:25565 ...
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0answers
19 views

Confusion over OCSP support from a web-site? Openssl vs Broweser Information? Which one to believe?

I am looking at a website in Google Chrome, according to an article that I read online in order to check if a website supports OCSF you can look at the Certificates>Details>Extensions and then see if ...
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0answers
22 views

Connection refused from signle host Ubuntu

I have an Ubuntu 16.04 running on machine A. It has a docker container running inside of it, which exposes the port 8080 to the outside (this is where the server(Wildfly) that is running inside the ...
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ovh proxmox vlan & vrack configuration

I have 2 proxmox nodes in dedicated servers at OVH. Both have vrack enabled and configured and working perfectly. I have 2 linux bridges: vmbr0 created by default by proxmox, with the public IP of ...
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0answers
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Very long TTFB and high CPU on VPS after Hypervisor Migration

I manage a VPS for my company with a small e-commerce website and a few low-usage Wordpress blogs and the like. My Service Provider migrated me to a different Hypervisor last Thursday, and since then ...
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1answer
19 views

Connecting to an l2tp VPN via script doesnt always use the same network interface

I have a linux web server and I need to create an on-demand l2tp ipsec VPN connection with a network route. The VPN connection works and the route is automatically created via a script in /etc/ppp/ip-...
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1answer
18 views

Why can't my Azure App service connect to my Azure Linux MongoDB instance?

I have a standard Azure app service running NodeJS through IIS and a Linux VM running mongoDB. When I set the firewall to allow all incoming connections into the VM, my app service has no trouble ...
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1answer
40 views

Nginx letsencrypt certbot ssl page will not load over https but will load over http

I am trying to set up a digital ocean server using this tutorial https://www.digitalocean.com/community/tutorials/how-to-set-up-django-with-postgres-nginx-and-gunicorn-on-ubuntu-16-04 The site is ...
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0answers
27 views

How to register my own 8.8.8.8? [duplicate]

I could't make a good title for this question. How can Cloudfare, Google or Quad9 use short IP-addresses like 8.8.8.8, 1.1.1.1, 9.9.9.9 ect? There are also other companies such as OpenDNS Home which ...
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High Network I/O Between Docker Swarm Managers

Network Traffic We run Docker Swarm with 3 manager nodes and 16 worker nodes. The network I/O between two of the three manager nodes is very high. To illustrate this, here is the output from iftop ...
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1answer
29 views

Kubernetes with Dual Stack on both Pod and Service level

I have 3 Ubuntu VMs where all of them have 2 interfaces. One interface with v4 address and other with both v4 and v6 address. 3 VMs are reachable from each other on all 3 (2 v4 and 1 v6) addresses. I'...
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1answer
79 views

Networking with two NICs on Ubuntu

My embedded hardware running Ubuntu 16.04LTS has two NICs, eth0 and eth1. In production, eth0 is connected and should use 192.168.0.1 as the gateway for addresses outside the /24 subnet. For ...
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1answer
29 views

Mikrotik + Freeradius + Mikrotik-Address-List

I have Mikrotik which works like PPTP server and Freeradius for authentication and authorization. How to assign PPTP user's IP or name in Freeradius (user1 = 10.11.1.145 in my case) with Mikrotik's ...
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1answer
32 views

How IPv6 headers handle next headers?

I was reading that IPv6 headers have a fixed size, but then there is a field for next header also present in the header, which can specify the next header. Even if the main header is being ...
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0answers
35 views

Routing traffic through a host connected to the VPN gateway

I have a VPN set up where multiple subnets are used. I have three VPN services, let's say A - 192.168.1.0/24, B - 192.168.2.0/24 and C - 192.168.3.0/24. I would like to have specific traffic from a ...
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1answer
85 views

How to determine “Predictable Name” of network interface

I am setting up a new server and installed Ubuntu Bionic, which uses Predictable Network Interface Names. The installer is running on a rescue system, which still uses old interface names like eth0, ...
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1answer
48 views

How to make a service (or the system process) impersonate the *elevated* variant of a user account?

In my network, there is a Windows 2008 R2 server with network name Dax. On that server, I have (among others, of course): a hard disk drive, mounted as E:\ a folder E:\odo an SMB share \\Dax\odo ...
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1answer
43 views

Static or dynamic IP for Clients in Domain

I run a little server environment with some clients (workstations and notebooks). Everything is working fine so far, clients are in my domain, primary dns is server and alternative is router, standard ...
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1answer
134 views

routing bridge traffic to VPN tunnel (AWS Client VPN Endpoint)

I have bridge created between eth0 & wlan0. Following is ifconfig root@ubuntu:~ $ ifconfig br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.24.11.15 netmask 255....
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1answer
32 views

How to force Client to use specific/local IPv6 address to access webserver

I'm running an Apache 2.4.29 web server with virtual hosts, of which some are publicly available, other shall only be accessible via local network. I have IPv6 up and running. The corresponding ...
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0answers
24 views

Reverse DNS Not Working on some Email servers

We host our email on an internal server. Recently we have started getting bouce backs from various other servers. Most seem to have the following error: Reason: Remote SMTP Server Returned: 550 ...
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0answers
44 views

Azure or VPN options for 3 remote sites

I received a call from a business owner. One of his services will only license and whitelist one public IP well he has three locations. When I got involved they were trying to spin up an OpenVPN ...