Re: www.freebsd.org and others (96.47.72.78) unreachable from a specific provider

On 2025-04-04 04:49:40 (+0800), geoffroy desvernay wrote:
> I'm working in a french university, and we noticed 96.47.72.78 is 
> unreachable from here, and from another french univ site using the 
> same provider (RENATER).
> Others french providers can reach it (tested a mobile one, free.fr, 
> ovh.com, evolix.com)
> IPv6 access works (is it the same host ?)
>
> using mtr from RENATER, we see this:
>  9. 77.95.71.77                        0.0%    16    9.5   9.7   9.3 
> 13.3   1.0
> 10. 64.125.29.94                       0.0%    16   92.2  92.0  91.9 
> 92.3   0.1
> 11. 208.184.34.238                       0.0%    16   88.1  89.9  88.0 
> 118.0   7.5
> 12. 96.47.77.210                       0.0%    16   88.2  88.3  88.2 
> 88.7   0.2
> 13. 96.47.66.42                       0.0%    16   88.3  88.3  88.0 
> 90.1   0.5
> 14. (waiting for reply)
>
> from another provider, the next (and final) hop responds ok…
>
> Could it be any filtering ?

Feels like a routing glitch at RENATER.  I see 96.47.64.0/20 everywhere 
I've looked (via RouteViews and RIPE RIS).

> I may help testing, just need someone on the other end…
> I can IRC, mail or ?, this probles seems to affect entire french 
> Education&research community (specifically those using IPv4 only).
>
> Hope someone will be able to help here (maybe the best option would be 
> a tcpdump on each side to start debugging this…), here we only see 
> SYN packets leaving our network.
>
> We opened a ticket with our provider too…

There isn't much we can do from this end.  As far as we can tell, the 
prefix is picked up by all our provider's upstreams.

> Thank you at least for reading ;)

Thanks for reporting.

Philip