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Fuchsia traceroute

An implementation of the traceroute utility in Fuchsia OS, done as a part of the IT253 - Operating Systems course.

This implemantation currently uses ICMP for traceroute probes.

Setup

The following setup is to test this implementation in Fuchsia running on a QEMU.

  • Create a tap device in the host
sudo ip tuntap add dev qemu mode tap user $USER && sudo ip link set qemu up
  • Enable IP forwarding in the host
echo 1 > /proc/sys/net/ipv4/ip_forward
  • Enable Proxy ARP for the tap device
echo 1 > /proc/sys/net/ipv4/conf/qemu/proxy_arp
  • Assign a static IP to the tap device
sudo ifconfig qemu 10.0.0.101/8
  • Assign a static IP to the default interface in the QEMU (Make sure it's in the same net as the tap device)
ifconfig ethp0002 add 10.0.0.100/8
  • Add a default route in the QEMU
net fwd add-device 2 0.0.0.0 0
  • Setup NAT in the host to enable access to external networks, from the QEMU (eth0 is the interface connected to the external network, qemu is the tap device)
sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
sudo iptables -A FORWARD -i eth0 -o qemu -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A FORWARD -i qemu -o eth0 -j ACCEPT