Callback to client behind a NAT / Firewall

[macnux]

Hi
how to Callback to client behind a NAT / Firewall?
like messangers and other programs that call client behind NAT
any example?

by the way messangers works fine without opening ports on te router.

thanks in advance.

[dilettante]

Most programs don't "call back" to the client. Instead the client maintains a connection to the server as long as it is running/logged on.

There are exceptions using various techniques but they don't always work.

http://en.wikipedia.org/wiki/NAT_traversal

This is a NAT issue, with little to do with firewalls. If a firewall is going to block traffic you'll never get around it unless the firewall is faulty.

[macnux]

To enable NAT-T for systems behind NATs to communicate with other systems behind NATs, the following registry key needs to be added and set to a value of 2: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IPsec\AssumeUDPEncapsulationContextOnSendRule

if i make this key and set it to 2 i will be ablle to connect with machines behind LAN?

thanks in advance.