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add notes how to configure QEMU network with TAP. Signed-off-by: raiden00pl <raiden00@railab.me>
44 lines
1.2 KiB
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44 lines
1.2 KiB
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=========
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QEMU Tips
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=========
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Netowrking with TAP device
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==========================
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Step 1: Configure NuttX network with ``NETUTILS_NETINIT``::
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CONFIG_NETUTILS_NETINIT=y
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CONFIG_NETINIT_IPADDR=0xc0a80868 # Target: 192.168.8.104
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CONFIG_NETINIT_DRIPADDR=0xc0a80801 # Router: 192.168.8.1
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CONFIG_NETINIT_NETMASK=0xffffff00 # Mask: 255.255.255.0
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Step 2: Create and configure a TAP device on the host::
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# Create the bridge
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sudo ip link add name br0 type bridge
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sudo ip link set br0 up
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# Create the tap interface
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sudo ip tuntap add dev tap0 mode tap
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sudo ip link set tap0 master br0
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sudo ip link set tap0 up
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# (optional) also attach your real NIC if you want LAN access
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# sudo ip link set enp3s0 master br0
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# Assign IP to the *bridge*
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sudo ip addr add 192.168.8.1/24 dev br0
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Step 3: Launch QEMU using the TAP interface::
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qemu-system-x86_64 -m 2G -smp 4 -cpu host -enable-kvm \
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-kernel nuttx -nographic -serial mon:stdio \
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-device e1000,netdev=mynet0 \
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-netdev tap,id=mynet0,ifname=tap0,script=no,downscript=no
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Step 4: Clean up::
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sudo ip link set tap0 down
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sudo ip link set br0 down
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sudo ip tuntap del dev tap0 mode tap
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sudo ip link del br0
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