From: Samuel Thibault <samuel.thibault@gnu.org>
To: Ottavio Caruso <ottavio2006-usenet2012@yahoo.com>
Cc: qemu-devel@nongnu.org
Subject: Re: Is traceroute supposed to work in user mode networking (slirp) ?
Date: Sun, 19 Jul 2020 04:50:55 +0200 [thread overview]
Message-ID: <20200719025055.kkjjiegyn4t6x64v@function> (raw)
In-Reply-To: <CAEJNuHze25wdA_Kjw8ryi+hmg0eLP8nhZMR50_2yqXPu_Jir9A@mail.gmail.com>
Hello,
Ottavio Caruso, le mar. 14 juil. 2020 12:15:48 +0100, a ecrit:
> I cannot get traceroute to work with standard udp from any of my
> guests.
>
> $ traceroute 8.8.8.8
> traceroute to 8.8.8.8 (8.8.8.8), 64 hops max, 40 byte packets
> 1 * * *
That was because
- libslirp was not forwarding the ttl value, thus always set to 64 hops
- libslirp was not reporting icmp errors.
I had a try at both, and that indeed seems to be fixing the issue:
https://gitlab.freedesktop.org/slirp/libslirp/-/merge_requests/48
https://gitlab.freedesktop.org/slirp/libslirp/-/merge_requests/49
> Any clues? Is this intended behaviour? Any workarounds that don't
> involve tap/tun/bridges?
Not without updating libslirp with the abovementioned patches.
Samuel
next prev parent reply other threads:[~2020-07-19 2:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAEJNuHy+CqveTjiCxpjiLX-D=NczSveUSDSAZyz=D5F0XvL5QQ@mail.gmail.com>
2020-07-14 11:15 ` Is traceroute supposed to work in user mode networking (slirp) ? Ottavio Caruso
2020-07-19 2:50 ` Samuel Thibault [this message]
2020-07-19 11:07 ` Ottavio Caruso
2020-07-19 11:16 ` Samuel Thibault
2020-07-19 14:15 ` Ottavio Caruso
2020-07-19 14:58 ` Ottavio Caruso
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