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From: Thomas Huth <thuth@redhat.com>
Message-ID: <d82e7abb-9f6d-0ed3-6c4d-05dd99d98450@redhat.com>
Date: Wed, 7 Feb 2018 10:08:56 +0100
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Subject: Re: [Qemu-devel] Regarding Network interface on QEMU
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To: Arun raj <krarun88@gmail.com>, qemu-devel@nongnu.org

On 07.02.2018 09:55, Arun raj wrote:
> Hi,
>=20
> I'm new to QEMU and using latest QEMU-2.11.50 version. i installed ubun=
tu
> 16.04 in QEMU and my host system has 4.4 kernel
>=20
> following command is i'm using to run the QEMU :
>=20
> qemu-system-x86_64 -machine q35,kernel_irqchip=3Dsplit -m 1G -enable-kv=
m -smp
> 4 -device intel-iommu,intremap=3Don,x-buggy-eim=3Don -cpu
> kvm64,-kvm_pv_eoi,-kvm_steal_time,-kvm_asyncpf,-kvmclock,+vmx -drive
> file=3Dtesting.img,format=3Draw,id=3Ddisk,if=3Dnone -device ide-hd,driv=
e=3Ddisk
> -serial stdio -serial vc -netdev user,id=3Dnet -device
> e1000e,addr=3D2.0,netdev=3Dnet -device intel-hda,addr=3D1b.0 -device hd=
a-duplex
>=20
> But in QEMU i can't able to access the internet and ping also not worki=
ng.

It's normal that "ping" (or rather ICMP) is not working by default with
the "-netdev user" backend. The "user" backend is using NAT. But you
should be able to get to the outside via TCP. See this URL for details:

https://wiki.qemu.org/Documentation/Networking#User_Networking_.28SLIRP.2=
9

Do you see a network interface in the guest? Does it have an IP address?
I.e. what's the output of "ifconfig" or "ip addr" in the guest? Does it b=
ehave
behave differently if you use another type of NIC, e.g. "virtio-net-pci"
instead of "e1000e"?

 Thomas