Questions tagged [udp]

UDP stands for User Datagram Protocol. With UDP applications can send messages (datagrams) to other hosts on a network without requiring prior communications to set up special transmission channels or data paths.

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VM Instance - Network Router in use

Hello guys anyone with an idea how i can get google to configure the network router hosting/supplying internet to the VM instances to allow traffic both UDP and TCP port 4500 for any IP address.
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Traffic Control on Pritunl

I have a OVH-Game server with a 1Gbps Port and from time to time I will do speedtest. When the server is in mitigation and the download speed of the test goes over 30mbps you get disconnected for a ...
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What GCP product to use to run Docker container exposing a range of UDP ports to public internet

I am confused about which GCP product to use such that I can run a Docker container e.g. like "docker run -p 5001-5110:5001-5110/udp hunter_ctrl_standalone:latest -s foo". The container will ...
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Hole punching in a double symmetric NATs with an intermediate server only for establishing a connection? [duplicate]

There're a server and multiple clients. A server is behind symmetric NAT and clients are may or may not happen to be behind a NAT. For the worst case, I assume that a client is behind symmetric NAT ...
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Can a connection between “cone NAT with port restriction” and “symmetric NAT” be established without a third-party?

Directly it's impossible, right? Using an intermediate server isn’t an option because I have a requirement that says that a solution has to exchange lots of data and also be fast. Although, creating a ...
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Hyper-V VM's LocalPorts blocked

I am having issues with Local ports on hyper-V VM's I have enabled Hyper-V on my Windows10 laptop and Deployed windows 2019 sever Virtual machines to create the SCCM Lab environment. All Virtual ...
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1answer
506 views

Docker cant resolve DNS-Names outside of docker network. Receiving “read from DNS server failed”

I have deployed an Adguard Home docker container which i want to use as my DNS server/proxy. DNS resolution is working fine when i'm making an nslookup from a machine (as well as the docker host) on ...
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UDP-Packets seem to get lost in IPsec tunnel from Strongswan to AWS cloud - connection works with Openswan

Use case: IOT-device connected through AWS cloud The IOT-device is behind a router that sends all traffic through aws cloud. The IOT-server can not be configured and thus is not part of the AWS cloud ...
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netsed not directing packets to remote server

I'm trying to spoof a packet that gets sent from a client process to port 8092 of a game server via UDP. I've tried to set up a transparent proxy via iptables like so: sudo iptables -t nat -A OUTPUT -...
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Forge UDP checksum

We're having some IPSec connection problems that seem connected to the UDP checksum beeing (incorrectly) set with some ISPs. To investigate further, I want to reproduce the error within a controlled ...
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96 views

OpenVPN does not connect outside network

We have a small office setup, currently due to pandemic employees need to work remotely therefore we are tying to configure OpenVPN so they can access internal applications. Using following tutorial I'...
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iptables: redirecting inbound UDP to a different port, and response going out the “public” port

I have an SNMP agent listening on a high-level port (16161) and I want to redirect traffic from the standard SNMP agent port 161. Easy iptables rule: iptables -t nat -A PREROUTING -p udp --dport 161 -...
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1answer
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UDP connection i/o timeout while port is reachable

on one server we encountered an issue where all kinds of UDP connections are failing. The same application and tests work on other servers with the same OS and similar setup. nc -vz -u 83.61.**.** ...
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1answer
58 views

UDP NAT is not working

I have, among others, the following iptables NAT rules on the machine with IP addresses 192.168.1.71 and a.b.c.d, where a.b.c.d represents a public IP address: iptables -t nat -A PREROUTING -p udp --...
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How to check the udp port is accessible in an Ubuntu machine which is protected by a firewall

We were trying to install "Big blue button" in an Ubuntu server with a firewall. For installation, we need these UDP ports ("16384-32768") should be opened in the firewall. But we don't know whether ...

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