[rbldnsd] List servers

[Scott Haneda]

On Mar 14, 2010, at 4:06 AM, Benedict White wrote:

> Scott Haneda wrote:
> 
>> 1 million per day is only about 10 per second - even a 486DX2 would
>> easily deal with that.
> 
> Any idea what sort of bandwidth that would be?

Let's say that the size of a query reply is 260 bytes [1], multiplied by 1,000,000 equals 247.955322 megabytes per day, or 7.26431608 gigabytes per month.  Not insignificant, and that is a very top end of the scale estimation.  Cutting it in half is probably more realistic.

DNSBL's to tend to return more bytes than normal DNS requests just because of the nature of prefixing the domain with a reversed IP, email address, or some other lookup data.  There are also TXT records, which could be around double those numbers I believe.

between 4GB and 7GB a month I would say, which most ISP's on a leased server are easily throwing in as part of the cost.

I think worries will not be bandwidth related, but resource.  I can remember many times in the past when a BL went under DDoS attack, and only the upstream can help you in those cases.  I do not believe the local machine has the power to even handle the blocking, if you can even get into it anymore :)

[1] http://w6.nic.fr/dnsv6/resp-size.html
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