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fix: properly setup outbound network connectivity in getting started #4932

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Nov 28, 2024
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fix: properly setup outbound network connectivity in getting started #4932

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11 changes: 5 additions & 6 deletions docs/getting-started.md
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Original file line number Diff line number Diff line change
Expand Up @@ -197,17 +197,16 @@ sudo ip link set dev "$TAP_DEV" up

# Enable ip forwarding
sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"
sudo iptables -P FORWARD ACCEPT
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HOST_IFACE="eth0"
# This tries to determine the name of the host network interface to forward
# VM's outbound network traffic through. If outbound traffic doesn't work,
# double check this returns the correct interface!
HOST_IFACE=$(ip -j route list default |jq -r '.[0].dev')
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# Set up microVM internet access
sudo iptables -t nat -D POSTROUTING -o "$HOST_IFACE" -j MASQUERADE || true
sudo iptables -D FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT \
|| true
sudo iptables -D FORWARD -i "$TAP_DEV" -o "$HOST_IFACE" -j ACCEPT || true
sudo iptables -t nat -A POSTROUTING -o "$HOST_IFACE" -j MASQUERADE
sudo iptables -I FORWARD 1 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
sudo iptables -I FORWARD 1 -i "$TAP_DEV" -o "$HOST_IFACE" -j ACCEPT

API_SOCKET="/tmp/firecracker.socket"
LOGFILE="./firecracker.log"
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