An exit node is like a relay node but with a connection out to the Internet. Exit nodes are run by sudo mesh and have the sudo mesh organization listed as the whois abuse complaint contact. This ensures that legal inquires for Internet-bound traffic from the mesh are sent to sudo mesh so node-operators don't have to deal with e.g. DMCA complaints and other legal issues unless absolutely necessary. We encourage anyone and everyone to run relay nodes, but we do not expect anyone else to run public exit nodes. If you're still interested in running an exit node, come talk to us!
This page below is outdated and is kept for our communal scrapbook. Please use https://github.com/sudomesh/exitnode for a more up-to-date info.
Exit nodes do everything relay nodes do and adds the following:
- NATed internet access
- DNS server
- Fake captive portal
This guide builds on top of the relay node guide, so follow that first and them come back here!
NATed internet access
Create the script /etc/init.d/meshnat containing the following:
#!/bin/sh PUBIF="eth0" BATIF="bat0" case "$1" in start) if [ "`iptables -t nat -L|grep MASQUERADE`" = '' ]; then echo "Starting mesh NAT" echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A POSTROUTING -o $PUBIF -j MASQUERADE iptables -A FORWARD -i $PUBIF -o $BATIF -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -i $PUBIF -o $BATIF -j DROP else echo "Mesh NAT already started" fi ;; stop) echo "Stopping mesh NAT" echo 0 > /proc/sys/net/ipv4/ip_forward iptables -F FORWARD iptables -t nat -F POSTROUTING ;; *) echo "Usage: $0 start|stop" >&2 exit 3 ;; esac
Make it executable:
chmod 755 /etc/init.d/meshnat
Now modify the tunneldigger broker/up_hook.sh hook script to start the meshnat script. Change the section:
if [ `cat /sys/class/net/bat0/operstate` != "up" ]; then ifconfig bat0 <relay_mesh_ip> netmask 255.0.0.0 up fi
if [ `cat /sys/class/net/bat0/operstate` != "up" ]; then ifconfig bat0 <exit_mesh_ip> netmask 255.0.0.0 up /etc/init.d/meshnat start fi
Where <exit_mesh_ip> is the assigned mesh IP address for your exit node. E.g: 10.42.0.1.
Now NAT should be set up correctly.
Setting up DNS
First, ensure that tunneldigger broker is not running on port 53 by removing port 53 from the "ports=" entry in /opt/tunneldigger/broker/l2tp_broker.cfg
Now, install dnsmasq:
sudo aptitude install dnsmasq
Ensure that you have one or more domain name server IPs in /etc/resolv.conf
Make sure that ENABLED=1 is set in /etc/default/dnsmasq
Restart dnsmasq if you changed anything:
sudo /etc/init.d/dnsmasq restart
Fake captive portal
TODO write this section