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Re: [Qemu-devel] Connection breaks for macvtap
From: |
Anthony Liguori |
Subject: |
Re: [Qemu-devel] Connection breaks for macvtap |
Date: |
Wed, 27 Mar 2013 19:11:04 -0500 |
User-agent: |
Notmuch/0.13.2+93~ged93d79 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-pc-linux-gnu) |
Richa Marwaha <address@hidden> writes:
> Hi
>
> I am trying to run some KVM fuzz testing where I have a tool called scapy
> running on my host and guest which changes the data in the IP header
> of the
FWIW, I don't think you'll gain a lot from this. QEMU does not ever
look at a packet beyond the MAC address (and perhaps any vlan tags in
the ethernet header). That far up the stack is strictly
application/network infrastructure land.
So if your goal is to fuzz test the Linux networking code, then this
approach is fine. But it's unlikely to do anything useful with QEMU itself.
> packages and send it out to the host and vice versa. I have macvtap setup
> on my host (have tried both VEPA and Bridge mode).
Unless you have an explicit reason to use it, I'd steer away from
macvtap. It's not commonly used.
> My ssh connection to my guest breaks down after having send just 22
> packets
If you're munging random IP packets, you're going to lose connections
:-) That's pretty much a given. I'm not surprised at all it happens
this quickly.
> and also the gnome crashes. I see the following message in the dmesg
>
> dbus[545]: [system] Rejected send message, 2 matched rules;
> type="method_return", sender=":1.0" (uid=0 pid=499
> comm="/usr/lib/systemd/systemd-logind ") interface="(unset)"
> member="(unset)" error name="(unset)" requested_reply="0"
> destination=":1.17" (uid=42 pid=658 comm="/usr/bin/gnome-session -f --debug
> ")
I don't know what this is but if you were doing something like remoting
X over an ssh session, this wouldn't be much of a surprise.
Regards,
Anthony Liguori
>
> The connection to the guest restart but wanted to know what makes it
> breakdown.
>
> Regards,
> Richa Marwaha