Container performing iptables NAT to provide Internet access to GNS3 topologies.

From the container console start the nat.sh script from /data directory Configure /data/nat.sh according to your topology, then start it start dnsmasq for DHCP and iptables for NAT (masquerade)

sh /data/nat.sh

Example of deployment:
GNS3 + Docker: Internet modem container

References:

https://github.com/GNS3/gns3-registry/tree/master/docker/dhcp