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Re: [Qemu-devel] Is anyone able to load a web page from a guest operatin

From: Laszlo Ersek
Subject: Re: [Qemu-devel] Is anyone able to load a web page from a guest operating system?
Date: Wed, 27 Apr 2016 13:01:17 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.2

On 04/27/16 12:26, Thomas Huth wrote:
> On 27.04.2016 12:05, Laszlo Ersek wrote:
>> On 04/26/16 22:12, Thomas Huth wrote:
>>> On 26.04.2016 21:25, Programmingkid wrote:
>>>> On Apr 26, 2016, at 3:00 PM, Dr. David Alan Gilbert wrote:
>>>>> Does ping work?
>>>> I can ping the virtual router at Any other ip address fails. 
>>> That's normal for user-mode / slirp networking. You can't ping external
>>> hosts with this mode.
>> Side note: yes, you can.
>> I do it whenever I want to check network connectivity from within ad-hoc
>> OVMF guests, using the PING command of the UEFI shell. ("Ad-hoc guest"
>> implies user-mode / slirp.)
>> It can be enabled with the following steps:
>> (1) Determine the main group ID (or one supplementary group ID) of the
>> user that will run QEMU with slirp.
>> (2) In /etc/sysctl.conf (or whatever is appropriate for your host
>> distro), make sure that the whitespace separated inclusive group ID
>> range in the "net.ipv4.ping_group_range" sysctl includes the above group ID.
> Wow, thanks for that hint, I just tried by temporarily enabling it with
>  sudo sysctl net.ipv4.ping_group_range=...
> and indeed it works!
> Maybe we should document that somewhere?
> For example  http://qemu-project.org/Documentation/Networking currently
> only says: "ICMP traffic does not work (so you cannot use ping within a
> guest)" ...



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