Just stumbled over this:
Note - if you are using the (default) SLiRP user networking, then ping
(ICMP) will not work, though TCP and UDP will. Don't try to use ping to
test your QEMU network configuration!
(https://wiki.qemu.org/Documentation/Networking)
On 2020-07-09 14:18, Ottavio Caruso wrote:
Hi,
I have enabled pinging from the guest changing the
"net.ipv4.ping_group_range" on my Linux host. I can now ping any host
using icmp. But I cannot get traceroute to work with standard udp:
$ traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 64 hops max, 40 byte packets
1 * * *
2 * * *
3 * * *
4 * * *
[and so on]
And if I use traceroute over icmp, I only get one hop shown:
$ traceroute -I 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 64 hops max, 60 byte packets
1 dns.google (8.8.8.8) 26.147 ms 27.88 ms 20.048 ms
I have tested this with various guest OSes (OpenBSD, FreeBSD, NetBSD,
Small Damn Linux).
I've played around with various virtual interfaces but I have the same
result.
Any clues? Is this intended behaviour? ANy workarounds that don't
involve tap/tun/bridges?
--
Ottavio Caruso
--
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