Re: Inefficienty of CTAN Mirror traffic for internal campus users (Routing/Redirect issue)

Hello all, 

Is there something we can do about this? 

Regards,
Subhankar 

> On Dec 3, 2025, at 3:35 PM, Annada Behera <[email protected]> wrote:
> 
> Hi Mr. Hira
> 
> I am writing to bring to your attention a routing inefficienty regarding
> our local CTAN mirror hosted at https://mirror.niser.ac.in/ctan/. We
> host a high-speed mirror locally within our datacenter, but internal
> users clicking the standard https://mirror.ctan.org/ are currently being
> redirected to external mirrors:
> 
> -- https://in.mirrors.cicku.me/ctan/
> -- https://2.mirrors.in.sahilister.net/ctan/
> -- https://3.mirrors.in.sahilister.net/ctan/
> 
> Although our mirror is listed in the official website here:
> https://ctan.org/mirrors/ the redirected issue still persists.
> 
> Here is the ping output:
> 
>    [void:~] ping -c 20 -q 2.mirrors.in.sahilister.net
>    PING 2.mirrors.in.sahilister.net (82.180.146.159) 56(84) bytes of data.
>    --- 2.mirrors.in.sahilister.net ping statistics ---
>    20 packets transmitted, 20 received, 0% packet loss, time 19003ms
>    rtt min/avg/max/mdev = 48.379/91.480/176.565/33.490 ms
> 
>    [void:~] ping -c 20 -q mirror.niser.ac.in
>    PING mirror.niser.ac.in (10.10.0.36) 56(84) bytes of data.
>    --- mirror.niser.ac.in ping statistics ---
>    20 packets transmitted, 20 received, 0% packet loss, time 19422ms
>    rtt min/avg/max/mdev = 0.483/0.534/0.558/0.020 ms
> 
> We are being redirected halfway through India to a mirror in
> Mumbai with an average 90+ ms latency when a submilisecond
> 0.534 mirror is in the campus.
> 
> Hopefully you can setup a network level redirection for all ctan mirrors
> to point to the server at the datacenter. Thank you for your attention.
> 
>    Annada