192.68? really? Can you give a full example address that you know could be used?

The range I was given by the venue was 192.68.49.*

Does something look wrong about it?

It's just close enough to 192.168.* that I'm suspicious it's not actually correct.

ah I see now. I'll double check and get back to you.

I've checked and I'm happy that's the address

@Richard_Nevell_WMUK Your event participants wouldn't be happy to discover they can't create an account would we whitelist this address.

The IPv4 space have private ranges, to assign IP to local network. These IPs are not routed on the public ICANN Internet. 192.168.* is such a range.

This means than individual computers at the event will get this IP.

But when they connect to Wikimedia network, they will do something like this:

[ Computer at 192.68.49.26 -> router at 192.68.49.1 ->] router at 2.3.4.5 -> some transit providers -> some Wikimedia -> the final server

The part between [] is the private network one, the address to give us in this example scenario would be 2.3.4.5.

So please get in touch again with the Senate House Library netwrok administrator, and ask them the outgoing IP.

What to do if they don't know and we don't have time for further inquiries?

If they don't know, and use Windows, you can ask them to open a console (start menu > write "console") and write tracert en.wikipedia.org ). If they use Linux or Mac, the command is traceroute en.wikipedia.org. That will give us the journey an IP packet has to do to reach Wikimedia servers from the library.

The copy/paste of this traceroute will allow us to figure the correct IP or range to whitelist.

More easy: ask them to copy/paste the IP at http://www.runuo.com/ip.php.

I've had an update: the IP addresses are 217.138.7.29 and 217.138.7.30.

Change 254405 had a related patch set uploaded (by Dereckson):
Senate House Library throttle rule

https://gerrit.wikimedia.org/r/254405

Change 254405 merged by jenkins-bot:
Senate House Library throttle rule

https://gerrit.wikimedia.org/r/254405