NAME

       gnunet-nat-server - help GNUnet setup test network setup with NAT

SYNOPSIS

       gnunet-nat-server [options] PORT

DESCRIPTION

       Normal  GNUnet  end-users  should not concern themselves with gnunet-nat-server.  In fact,
       distributions  are  encouraged  to   consider   not   shipping   it   at   all.    Running
       gnunet-nat-server's is similar to running hostlist servers: it is a special service to the
       community with special requirements and no benefit to those running the service.

       This program will listen on the specified PORT for incoming  requests  to  test  a  peer's
       network  connectivity.   Incoming  requests  can ask it to connect to a given IPv4 address
       (and port) using TCP or UDP and to send a 2-byte test message using the specified address.
       The  program  can  also  be  asked  to send a "fake" ICMP response message to a given IPv4
       address (for autonomous NAT traversal --- see the description in the  respective  research
       paper).

       The  idea  is  that  gnunet-nat-server will be run on some trusted hosts with unrestricted
       connectivity to allow GNUnet users to test their network configuration.  As  written,  the
       code  allows  any  user  on the Internet to cause the gnunet-nat-server to send 2-bytes of
       arbitrary data to any TCP or UDP port at any address.  We believe that this  is  generally
       harmless.

       When  running  gnunet-nat-server,  make sure to use a configuration that disables most NAT
       options but enables 'enable_nat_client' and  sets  'internal_address'  to  the  global  IP
       address  of  your  local  host.   Also,  the  gnunet-helper-nat-client should be installed
       locally and run with root privileges (SUID), otherwise the gnunet-nat-server will not work
       properly.

       Note  that  gnunet-nat-server could be run via gnunet-arm but typically is not.  Also, the
       name of the host and port that gnunet-nat-server is run on  should  be  specified  in  the
       NATSERVER  option  in  the  [setup]  section  of  the configuration file of hosts that are
       supposed to autoconfigure with this server.

OPTIONS

       -c FILENAME,  --config=FILENAME
              Use the configuration file FILENAME.

BUGS

       Report bugs by using Mantis <https://gnunet.org/bugs/> or by sending  electronic  mail  to
       <gnunet-developers@gnu.org>

SEE ALSO

       gnunet-transport(1)