All posts tagged this server

Yet another hacking attempt – this time on our mail server


As of this morning :


Notice the “Max DSLAM” speed – and that the “Current throughput” keeps on tracking very close to that. It went up 10 Mbit/s in the last 24 hours. The “Attainable throughput” of 73 Mbit/s indicates that there is headroom on the line to improve the throughput even more.

Today :


the Fritzbox now shows a download speed of 49 Mbit/s. Up almost 14 Mbit/s since yesterday.

It will be interesting to see when we’ll get back to the 80Mbit/s.


now down to 35 Mbit/s! This is not improving.

Slightly puzzling that the S/N ratio is as high as it is though.

I’ve used Memcached for a number of years now – but lately I’ve started moving my own stuff to Redis.

So I am pleased to see a simple administrative monitoring program for Redis – Redmon.

Our Infinity line started life at 78 Mbit/s down and 20 Mbit/s up. But has in the last month or so progressively gotten slower and slower, as can be seen here :


It’s now down to 39 Mbit/s down and 18 Mbit/s up.

I’m now resetting contacts etc. to see if the problem is local or not.

And the reason is clear :


there does not seem to be any higher frequencies getting through at the moment ….

Now that the BT Infinity line has had time to settle down (no restarts in the last month) and stabilise the statistics look like this :


The download throughput has gone down to around 67 Mbit/s, and uploads as expected 20 Mbit/s. All in all not bad.

The rather alarmingly large figures on FEC error for the last 15 minutes are obviously there as a bug in the router, as you can see if you try to multiply the figures per minute by 15 you will not get the rates in the next column, so I will disregard these.


very good – based on having transferred 20 Gbyte yesterday .

It looks like some Xbox functionality related to Xbox chat needs this option “unticket”???


The new line has now had almost a week to settle down – and although it has restarted a few time (possibly as part of the training) the data now looks like this


Looking good – it’s really fast, and upstream looks just as good. Streaming of movies from our home library and the Slingbox works very well indeed when we’re out and about.

I’d call this a success so far – and the Fritzbox is behaving impeccably.

When you run your own mail server on your own domain and move to BT Infinity there are a few possible issues

– BT does not offer static IP addresses for the non-business version of Infinity

A lot of recipient mail servers will refuse to receive email from mail servers with dynamic IP addresses, as their spemfilters rely on tracking known spammers by the IP addresses they use.

So you will have to use BT Internets “smart host” = to relay your outgoing mail through.

If you (as I) use a Mac running OsX as a mail server running postfix, this will not work out of the box, as the authentication mechanism used is plain text.

So you need the line

smtpd_sasl_security_options = no anonymous

in your main configuration file for postfix (in /etc/postfix)