Would that it were so simple!
Unfortunately, the only 2 methods I have to access the router are through a stripped to the basics CLI - which provides no access at all to the filesystem and only a limited set of commands, or through it's web interface which is even more restrictive (although of course, easier to use). It's possible it MAY be running some version of Linux, but if so, it's stripped to the basics, which a customised shell giving a very limited set of commands.
All I can find out about it is from these commands:
sysinfo - which just gives uptime, 1, 5 and 15 minute load averages, and memory use;
meminfo - which just gives a bit more detail on memory use;
swversion - 2.32e, which is singularly unhelpful, except to confirm that it's on the latest stable release!
and deviceinfo, which just gives the model name (BiPAC 8800NL), SW version (as above) and MAC address.
ifconfig gives a *nix type output, and ps gives a list of very *nix looking processes, so if I could access the filesystem and edit it's contents, that may be of some use. I backed up the config to a local drive, but it appears to be binary, and therefore not amenable to editing!
Sadly, I can't even find /sbin - there doesn't appear to be any way to get under this protective shell (which I suppose makes sense for a device of it's type and probably reduces support costs for Billion, who make it).
I'm not sure how long I was in the CN zone for before this started happening, but I see another thread where an operator was getting flooded from there, so I don't appear to be the only one, and absent a router which gives more access to it's operating system, there doesn't appear to be any way I can participate in the attempts to bootstrap the ntp pool in China, and I'm effectively knocked out of the pool until I'm removed from the CN zone.
If it were my firewall (another box entirely - I have a /29 network, so there are things outside the firewall as well as inside it) it would be a different matter! That's running FreeBSD with fw2, and I can access anything I want, if I use root to do so! But that is running very happily - it also happens to be my stratum 1 ntp server, with a Garmin 18x plugged into it's serial port (for signalling) and USB port (for power).
I've never yet seen it get above 10% processor utilisation, and the only time I ever had a a problem was when a logfile got left out of the archival rotation, and filled up /var (oops).