Hello Simon,

I have talked with the administrator of mirror.bjtu.edu.cn today, and
have some information for you here.

1. mirror.bjtu.edu.cn only supports IPv4, mirror6.bjtu.edu.cn only
supports IPv6. This was designed to avoid IPv4 users suffer slow
response when mirror.bjtu.edu.cn has AAAA record.
 - To satisfy Debian's requirement, debian.mirror.bjtu.edu.cn has been
set up with both IPv4 and IPv6 support.

2. The administrator said syncing from ftp.tw.debian.org is not so
efficient because of the connective problems in China's network.
Mirroring from IPv6 enabled primary mirrors will be much more
efficient (usually ~10 times of bandwidth available, and the network
is much less busier), so if this would be acceptable? What's more,
primary mirror's server can connect to bjtu's mirror directly through
IPv6 without extra work to do.

3. More on push triggering. Push triggered updates via IPv4 has some
problems because the network is behind a firewall so ftp.xy.debian.org
cannot connect to the mirror directly. As the domain name suggests
(bjtu.edu.cn), this mirror is located in CERNET (China Education and
Research Network) and hosted by Beijing Jiao Tong University.

There is a work around that might be used: make ssh tunnel from bjtu's
mirror to ftp.xy.debian.org, so the latter can connect back using the
tunnel to send push info. But I believe using IPv6 would be a better
solution.

4. The mirror has all architectures mirrored, so we'd like to make it
ftp.cn.debian.org if possible. (No hurry, :D)


-- 
Regards,
Aron Xu



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