Synology Disk DS211J

Leo Bicknell bicknell at
Thu Sep 29 19:34:18 UTC 2011

In a message written on Thu, Sep 29, 2011 at 12:11:48PM -0700, Jones, Barry wrote:
> A little off topic, but wanted to share... I purchased a home storage Synology DS1511+. After configuring it on the home net, I did some captures to look at the protocols, and noticed that the DS1511+ is making outgoing connections to (www) and (port 81 & 89) on a regular basis. These addresses are owned by Synology and Chungwa Telecom in Taiwan. 
> So far, I've not been able to find much information on their support sites, or Synology's wiki, but I wanted to put it out there. 
> GET / HTTP/1.1
> Host:
> Accept: */*

Perhaps a little further digging was in order?  For instance, putting
the IP and port in a web browser ( which

<html><head><title>Current IP Check</title></head><body>Current IP Address: REDACTED</body></html>

Looking at Synology's web page we find:

If they are going to do things like UPNP to open a port, and then DDNS
to let you get there from the outside world than the box needs to know
your outside NAT address, and simple relays like this are the best bet.
It's another ugly hack to get around the problems of a NAT in the
middle.  I bet the box also checks for a new version of software from
time to time.

While I would like vendors to better disclose the "phone home" behavior
of their devices, virtually every computing device does this in some way
or another if only to check for new software.  Windows and Mac's check a
web server to know if you are "connected to the internet" or not.  NAT
traversal often uses a relay.  DDNS registrations need the real IP, and
so on.

Not much to see here, really, other than how ugly some of our protocols
are in the real world.

       Leo Bicknell - bicknell at - CCIE 3440
        PGP keys at
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