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Re: Is traceroute supposed to work in user mode networking (slirp) ?
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From: |
Samuel Thibault |
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Subject: |
Re: Is traceroute supposed to work in user mode networking (slirp) ? |
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Date: |
Sun, 19 Jul 2020 04:50:55 +0200 |
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User-agent: |
NeoMutt/20170609 (1.8.3) |
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