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

From: Thomas Huth
Subject: Re: [Qemu-devel] Is anyone able to load a web page from a guest operating system?
Date: Wed, 27 Apr 2016 12:26:51 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.0

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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