Domain name based multihome routing?

Dale Mahalko dmahalko at
Wed Jun 27 16:59:47 UTC 2018

There is no way to know if this is the "right" or "wrong" approach without
actually trying it and see what happens.

Guessing the potential background domains used by Microsoft / Steam, etc
and monitoring bandwidth used by those domains is unfortunately the only
option available. It's not like any of these companies are willing to
outright divulge anything about these background details to anyone outside
their business.

As far as load on the router goes for keeping track of possibly tens of
thousands of custom routes, I am fine with dedicating a fast Intel i5 or i7
and a couple gigabytes of memory to the job. Most routers are tiny little
things with very little CPU needed for normal routing, with the heavy
lifting only happening if encryption is needed for a bunch of VPN

On Wed, Jun 27, 2018 at 9:16 AM, Matus UHLAR - fantomas <uhlar at>

> On Tue, Jun 26, 2018 at 12:45 PM, Grant Taylor via bind-users <
>> bind-users at> wrote:
>>> Are you saying that you want to dynamically update routes to IPs resolved
>>> in real time to specific host / domain names?  Such that traffic to
>>> specific hosts / domain names is routed over DSL?  With things that don't
>>> match conditions routed over cell?
> I think I understand what you want to do and why you want to do it.
> It seems like you're using named as the source of information to feed into
>>> the process that dynamically updates routing.
>>> I find the pausing of named to be questionable.  But I understand that
>>> you
>>> want to make sure that no connections are started until after the
>>> (re)routing has been done.
> On 26.06.18 14:07, Dale Mahalko wrote:
>> (I am no programming expert as mentioned, but I do IT stuff for a living,
>> so..)
>> The pause would only be long enough to look for a regex domain pattern to
>> be routed to the DSL, and then creating the route. This pause can likely
>> be
>> measured in nanoseconds.
> I don't think this could be done in nanoseconds. Maybe microseconds, but
> more probably miliseconds.
> Another question would be, how fast your router can be with potentially
> thousands of routes (I know, many OSes have routing optimised very hardly).
> This would likely be a multithreaded asynchronous mechanism so that BIND
>> does each of its lookups as usual, and then forks a followup thread after
>> it completes its normal lookup process, to do the pattern match and route
>> creation, followed by the delayed response released when the
>> pattern-match/route-creation thread terminates.
>> So in general using multithreading, there would be no real impact to
>> programs requesting the lookups, other than a delay per lookup that is so
>> small it would not be noticeable to an end-user human.
> I think that you are trying wrong approach, using wrong tools.
> Guessing the potential usage from DNS is not a goog idea.
> On your router, configure firewall to route selected protocols (gaming,
> ssh,
> RDP, dns) and maybe later some sites to paid cellular and router everything
> other to DSL.
> Note that at my home, most of data is spend by my children watching youtube
> videos - I don't think that routing general web and streaming services to
> cell connection would help you with anything.
> --
> Matus UHLAR - fantomas, uhlar at ;
> Warning: I wish NOT to receive e-mail advertising to this address.
> Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
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