Questions tagged [networking]

Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.

0
votes
0answers
28 views

How can I make the Domain Controller the client's default gateway?

I'm migrating from a SBS 2008 DC to a Windows Server 2016 DC. On the SBS DC, DHCP is set up and I've migrated this successfully to Server 2016. The PC's in the office use the SBS DC as their default ...
0
votes
0answers
14 views

Connections shows up in tcpdump but cannot not in auditd or ss

I ran tcpdump on a node which I can see many outbound TCP connections to a specific host (inside my network) on a specific port (8086). I'd like to know which process is making those connections. I ...
0
votes
0answers
18 views

Is there a way to list all SRV DNS records associated with host plus domain using dig or some other tool?

I'd like to query DNS using dig or nslookup and have it return all of the SRV records (like udp SIP records, etc) associated with a hostname+domain. Is this possible? I know I can query individual ...
0
votes
0answers
14 views

Predictable network names with systemd and vmware when moving image

Up until now we have named our network interfaces using the MAC adress as the key but have now reached a point where this no longer works. What we are trying to achieve is to be able to configure a ...
0
votes
1answer
38 views

Multi-subnet static routes

I am having an issue with building a static route that spans 2 different subnets and a vpn connection. My topology looks like this: Host-A: inet 10.0.28.45 netmask 255.255.224.0 broadcast 10.0.31....
0
votes
0answers
24 views

Transfering data from server is very slow from certain IPs

I've encountered a strange situation, and I am buffled on how to solve this. I have a dedicated server at Dacentec (let's call it Dacentec Server), which is running a CentOS 7 operating system, on ...
0
votes
0answers
20 views

Route third party domains to my AWS subdomain

I'm trying to achieve something similar to Shopify where users create an account on my website and it automatically generates a subdomain for them (e.g. store1.example.com). Users have their own ...
0
votes
0answers
21 views

Proxy to different web servers that use relative URLs

I have multiple web services running on the same machine on different ports, and I would like to use HAproxy to connect to them through different URLs For example, localhost/app1 should go to ...
-1
votes
0answers
19 views

How to debug intermittent connection timeouts?

I have some code that reaches out to a cdn to grab some data. The connection intermittently times out. Web App on Azure << -- >> CDN Since this is intermittent, am working on getting a repro ...
0
votes
0answers
28 views

Cannot connect to server over SSL/IMAP from some machines, but others work fine

Since this morning, a few of the machines in our office have been unable to fetch e-mail from our domain over IMAP. The server (Windows 2012 R2, IIS 8, MailEnable) is set up to listen on ports 143 and ...
0
votes
0answers
13 views

Binding multiple services to multiple addresses is conflicting

I have a server with a single interface that has a /29 assigned to it and all IPs work as expected. Apache is bound to both x.x.x.12 and 127.0.0.1 using port 80. I'm trying to bind a new service (...
0
votes
0answers
16 views

Can i netcat through my gateway (NAT router) without configuring the router? [on hold]

I'm (kinda) new to networking. I don't know if you understand my question. I wrote a simple program to listen to port 8080 on my pc. Netcat to localhost:8080 works perfectly fine (as expected), but ...
0
votes
0answers
7 views

I can not add other users to machines with a domain

I have a server Samba 4.5.16 Installed in a Debian, but I have problems for my users to log in to the machines. I had an old samba server and was migrate from there. We made a way of accessing your ...
1
vote
0answers
26 views

Dynamic Game Server Architecture

I'm trying to find a way to design a game server architecture for a real time mobile game. The design should be cost effective but still to some extend scaleable (later on at least with minimal effort)...
0
votes
0answers
11 views

multiple attempts of minecraft server? [on hold]

I have the following problem I want to create a server for my friends and I of minecraft in GCP, but following its gui and looking for tutorials I can not achieve it. I manage to create the server, ...
1
vote
4answers
44 views

DNS server on AWS : How to use iptables to redirect requests to it

I'm running my own DNS server on an AWS instance. I've modified my security group to accept UDP and TCP connections on port 53. However, my server is running on port 8053 so I somehow need to direct ...
0
votes
1answer
62 views

KVM Guest and Docker cannot connect to each other

I have a box with a single network interface eno1 and two IPs (x.x.x.100 and x.x.x.101). My datacenter (Hetzner) requires different MACs for each IP. /etc/network/interfaces: auto br0 iface br0 ...
0
votes
0answers
33 views

OpenVPN LAN routing

I have a remote machine hosting both an OpenVPN server and an HTTP/S server, but when an OpenVPN client is connected and sends requests to the HTTP/S server (the public IP of the remote machine), it ...
0
votes
0answers
25 views

What could be blocking my request?

I have a server running a VPN, but I mark specific requests to be routed outside of it. $~ sudo ip show table customtable default via 172.31.1.1 dev eth0 my.public.ip.here dev eth0 scope link ...
0
votes
1answer
42 views

Give an url to my server adress with port

I have a server url turn into aws EC2 instance. Actually i access to it using 1.2.3.4:8000 (the port specification is necessay to get it). I want to give it an URL instead. Example: 1.2.3.4:8000 ==> ...
1
vote
1answer
25 views

Hyper-V Server 2016: Not able to automatically grab IP addresses for VMs on a VLAN that is set up with IP Helpers

I'm quite new to this whole thing, so my apologies if my understanding of virtual networking is a bit lacking. I have a Hyper-V Cluster (Server 2016) and I'd like to be able to configure VMs that I ...
-1
votes
0answers
17 views

Not Able To Access IIS Web Server From The Public [on hold]

For 4 days, I have been trying to get my IIS web server to work! I am able to access the website internally through the internal static ip address 192.###.#.201 from different devices on the network. ...
0
votes
1answer
27 views

About duplication IP Settings on Cisco L3 Switch

I set up the IP for Cisco L3 switch, but why is the error only eth 1/2 even though there is an IP duplication as shown below? SW(config)# SW(config)# interface mgmt 0 SW(config-if)# ip address 192....
0
votes
0answers
11 views

I can't get usb keyboard to work on hp proliant ml350 g6 during boot up

I can't get my usb keyboard to work on hp proliant ml350 g6 during boot up. The keyboard only works after it boots up to the os. I cant access my bios or raid card or boot menu because keyboard does ...
-1
votes
0answers
24 views

Good network OS detection

I've been trying to do some OS detection on our corporate network, and I'm not having a ton of success, so I wanted to get some input from a larger group and see what other people are doing. I've ...
0
votes
0answers
14 views

Hyper V Virtual Switch Killed All Network Connection

I am working on some new Virtual machines for my department. On our test server I made a VM and added a virtual switch so it can talk to the other servers. It did not work how I wanted it so I took it ...
0
votes
1answer
41 views

How to route packets from bridged network interfaces to localhost?

I am setting up an Orange Pi to bridge two network interfaces. One of them is connected to a gateway, the other to the network interface of a thermal receipt printer. I would like to capture packets ...
0
votes
0answers
17 views

Tagged traffic throught FreeBSD server

i have a cable from provider with two VLANs on it, VLAN1 for internet and VLAN50 for VoIP. I need to take VLAN50 to my 192.168.0.2 server (PBX Panasonic TDE-600) on schema so it can connect to SIP ...
0
votes
1answer
30 views

tcpdump filter by/print last hop

If I have a network that looks like this: 56.56.56.56 192.168.0.1/24 ___________ ---| Modem 1 |----- | ___________ | ...
0
votes
0answers
20 views

Network setup - access services via port

I have the following network setup: Gateway/proxy and firewall box with Firehol installed 10.xx.xx.xx - Ubuntu internal server behind the gateway 192.xx.xx.xx - Ubuntu All traffic is routed ...
2
votes
0answers
55 views

Switchless Networking Configuration for Two Directly-Attached Nodes?

I have two Windows Server 2019 Datacenter Edition servers, each with RDMA-enabled Mellanox ConnectX‐4 Lx 25GbE DA/SFP NICs. I've directly connected them with a 1 meter SFP28 copper cable. How can I ...
2
votes
1answer
560 views

Testing connectivity between Unix and Windows servers

I am doing a failover activity between 2 data centers. In 1 data center, 1 Oracle database on Linux is replicating data to 1 SQL Server database on Windows using a replication tool. There is storage ...
0
votes
1answer
34 views

RHEL/CentOS 7 NIC Boot Order

Is there a way to ensure that one NIC boots and obtains it's IP address before another? I'm currently using 2/4 NICs on my server, one enp3s0f1 is a public network/IP and the other enp4s0f1 is bonded ...
0
votes
1answer
27 views

Why does this ip route/rule work with ssh but not with http/https?

I am operating a server that is connected that has an active OpenVPN client. To allow SSH access into the server, I added another secondary IP address to the server's WAN interface (eno1), and then ...
2
votes
1answer
31 views

Connection refused from localhost to localhost

I started a tcp listener using nc -l 127.0.0.1 900 and then attempted to connect to it using nc 127.0.0.1 900 when I got the connection refused error. The same happens when connecting using telnet. ...
0
votes
0answers
50 views

How to distribute socket.io servers globally?

We have a Socket.io service that needs constant communication with Mongodb. We currently have a load balancer server, 16 containers in a server (due to nodejs being single threaded, we split processes ...
0
votes
0answers
28 views

Objects in firewall filters on Juniper devices

Greetings and sorry for my English. I'm setting firewall filters on several Juniper SRX3xx appliances running Junos 15.1X49. What I'm actually trying to accomplish is to minimize my future manual ...
1
vote
1answer
71 views

Unable to download file using WGET on AWS instance enabled SR

I have the following topology 1, where there are 4 Cisco Routers deployed in each VPC. I am able to ping and generate traffic from Endpoint1:172.0.1.11 to Endpoint2:172.2.1.10 where the traffic passes ...
1
vote
1answer
42 views

LINUX / WINDOWS - Strange behavior when transferring files

Question : How files transfer could be slow and normal at the same time ? Transfer initiated from : Windows 7 computer on VLAN computer Source : NSD share (samba from IBM GPFS) on VLAN server ...
0
votes
0answers
20 views

Firewall filter for subnet to allow access from Kubernetes pod?

I have an instance that is on an internal subnet 10.128.0.0/20 with IP 10.128.0.53. I have a kubernetes service defined as: mysql ExternalName <none> 10.128.0.53 3306/TCP ...
0
votes
0answers
23 views

can't reach server via HTTP and SSH only Ping and Traceroute works

I am struggling with a weird problem for the last few days. I have a virtual dedicated server for my domain. Some machines on my local network have lost the ability to access it, or can only access it ...
0
votes
0answers
30 views

How can I make sure ping traffic over ipsec is going outside?

I've got a VPN tunnel (ipsec / StrongSwan) setup, connected. The other side is apparently able to ping me through the tunnel. However a ping from my side is said to be never received on the other side....
0
votes
1answer
27 views

Speed reduction in wifi mesh

Recently we configured a Wifi mesh system in our office. Initially, without the mesh system we achieved 95Mbps speed but after we prepared 3 devices for the mesh system speed reduced to 75-80 Mbps. ...
0
votes
0answers
26 views

Cant get a bridge ubuntu

Trying to set up kvm with some vms. I can ssh to my server, then ssh to the vm's it holds. I can ping the network from my vm. I cant ssh directly to my vm from my laptop. I have narrowed down the ...
1
vote
1answer
27 views

How to reset nftable counter?

It's really painful to use nftable. I have an ipv4 table and a input chain in it. table ip filter { # handle 7 chain input { # handle 1 type filter hook input priority 0; policy accept;...
1
vote
0answers
30 views

GRE tunnel not accept NAT

On server 1 installed pfsense. On server 2 installed debian. I've created GRE tunnel: GRE pfsense settings The tunnels are working: Why NAT rule not works?(all ports open, filter reloaded)
0
votes
1answer
41 views

Set up a NTP server which can be queried globally

I want to set up a server (hosted on aws/or a running system in some part of the world) as an NTP server that can be queried globally. Currently, I have modified the ntp.conf file on the node to be ...
1
vote
1answer
35 views

Problems with RD, RT import and RT export in MPLS VPN and BGP

I'm learning MPLS VPN with MP-BGP and I'm finding difficulties with undertstanding the RD value and the RT import and export values. From what I've already understand, RD (route distinguisher) ...
1
vote
1answer
53 views

Masquerade with nftables

I have PC-1 with 2 uplinks (modem1 and modem2) and LAN on eth0 interface: # ip -c -brief addr lo UNKNOWN 127.0.0.1/8 eth0 UP 192.168.0.7/24 modem2 ...
0
votes
0answers
33 views

Automatic re-adding default gateway for NIC in Windows 10

I have a problem with odd behaviour with gateway settings being auto-added. I have two integrated NICs on my windows 10 PC with same gateway IP address. One NIC is for ATM KVM (Intel VPRO), second ...