Fetching latest commit…
Cannot retrieve the latest commit at this time.
|Failed to load latest commit information.|
udpnat: tool for probing UDP NAT timeouts Written by jsharkey When a client sends UDP packets from behind a NAT, the NAT creates a temporary port mapping to allow the external server to send reply packets. If no UDP packets are seen after a given timeout, the port is reclaimed by the NAT, and the server can no longer reach the client. This timeout becomes important on mobile devices, where waking up the radio has battery impact. (If you send NAT keepalive packets too frequently, your battery drains quickly; if too sparsely, the NAT mapping will timeout.) NAT devices can have different timeouts, and you may not have access to their configuration details. This tool is designed to help you empirically derive that timeout. It operates in a "master" or "slave" mode. The master is responsible for sending a ping request and then sleeping. The slave passively replies to any incoming pings. This tool can be useful for setting the natt_keepalive timer variable in racoon.conf when running an IPsec VPN in NAT-Traversal (NAT-T) mode.