Hello,
Philippe Mathieu-Daudé, le lun. 09 sept. 2019 12:51:23 +0200, a ecrit:
> Anyhow, if you plan to properly (with your S-o-b) commit your patch to
> the libslirp repository,
Actually the libslirp repository already has something there. Since
IPv4/6 have a maximum of 64KB packets, it just
Hi Samuel,
On 9/8/19 1:29 AM, Samuel Thibault wrote:
>
> Now, with MTU set to 9000, the packets just don't go at all. Could you
> try the attached patch? The lowest layer of slirp was indeed limited to
> 1600-byte frames for no good reason. With this and the virtio driver, I
> could exchange
hi,
On 9/8/19 1:29 AM, Samuel Thibault wrote:
>> 16:49:39.430959 IP 10.0.2.2.33294 > 10.0.2.15.19003: UDP, bad length 9000 >
>> 1472
>
> tcpdump seems to be showing dumb output here. The packet is fragmented
> by slirp, which makes tcpdump confused and show only the first
> fragment. If you let
Hello,
As usual, several things here.
Chris Heinze, le mar. 03 sept. 2019 17:02:15 +0200, a ecrit:
> root@guest:~# tcpdump -ni eth0 port 19003
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
Chris Heinze, le ven. 06 sept. 2019 12:54:24 +0200, a ecrit:
> i'm not aware of any (canonical) parameters to set a max size for received
> packets
Ah, right.
> i found no way to configure slirp (in qemu) itself except for the DEFINEs in
> the if.h.
Yes, that's where it is to be configured
hi,
On 9/6/19 11:59 AM, Samuel Thibault wrote:
[...]
>> 16:49:39.430959 IP 10.0.2.2.33294 > 10.0.2.15.19003: UDP, bad length 9000 >
>> 1472
>
> Just to be sure: did you configure your guest mru to 9000 ? Does the
> emulated network hardware card support jumbo frames?
hm! all interfaces (host
Hello,
Chris Heinze, le mar. 03 sept. 2019 17:02:15 +0200, a ecrit:
> on the guest:
> root@guest:~# tcpdump -ni eth0 port 19003
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
>
with slirp, incoming packets to the guest get truncated (outgoing seem to work
correctly).
this has been observed on a x86_64 machine with devuan2 and qemu 4.1.0.
e.g. on the host:
root@host:~# qemu-system-x86_64 -net nic,model=virtio -net
user,hostfwd=udp::19003-:19003
root@host:~# head -c
