Usually lower MTUs are not a problem for properly configured networks, as even
lower MTU systems should begin fragmenting traffic. The issue comes where there
is a mismatch, and suddenly, larger than expected packets are dropped.
So I think the tor protocol does not need to support identifying relay MTUs,
but I'm also unsure if it tests the largest cell size against relays either.
Testing a very large cell size should identify if a relay is properly
configured.
-------- Original Message --------
On Feb 22, 2024, 5:47 AM, s7r - s7r at sky-ip.org wrote:
> pasture_clubbed242--- via tor-relays wrote: > Greetings, > > I believe there
> is a larger sized guard relay that has been having MTU > issues for about a
> week. All connections with packets above a certain > size are dropped. This
> results in partially loaded or broken webpages, > broken file downloads, etc.
> Do Tor directory authorities test MTU > (implicitly by speed test?) when
> testing relays? > > Wondering if anyone else noticed this or if it would be
> handled > automatically by dir authorities. > > Thanks all > This is indeed
> very interesting. I never experienced this problem but now that you mention
> it I will setup a test environment with some non standard MTU values. I doubt
> the directory authorities test also the MTU, but it's an interesting
> question, let's hope someone hosting a bandwidth authority will reply to
> this. Also, I'm not sure and I'm very curios what the bandwidth authorities
> should do about this? What if a relay has super good speed but very low MTU?
> Should it be excluded and marked as not running? Because it will be very hard
> for Tor to also include MTU in the router descriptors and be aware about it.
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