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