Re: Numbering nameservers and resolvers
On Tue, Aug 17, 2010 at 08:52:20AM -0400, Jared Mauch wrote: Selecting a site outside of your control is valuable. When I was hostmas...@cic.net, we traded with mr.net. These days, if I were in the same role, I would want to have three instead of two. Asia, Europe and US someplace. If US only, east, west and central. While this is good advice, I think it is also important to consider your customer base. I could easily host an authoritative nameserver for my domains in Japan, but I elected not to do so, because most of the end users who would be querying it are in Canada, and, with one nameserver in Canada and one in Japan, they would get a long RTT on DNS queries roughly half the time. -Phil
Re: DNS question, null MX records *summary of on list and off list replies*
On Tue, 15 Dec 2009 11:51:29 -0600, Eric J Esslinger wrote: B. Set spf -all, for those who bother to check that to stop inbound mail from your domain. You might as well also add a DKIM ADSP policy with dkim=discardable. Similar to your SPF policy, it announces that no unsigned mail (or no mail at all in your case) should come from this domain. But DKIM does not suffer from the problems SPF causes with email forwarding (see recent NANOG thread on that topic). -Phil
Re: Does Internet Speed Vary by Season?
On 2009-10-11, at 19:22 , Joe Greco wrote: (*) In the late 1990's, I heard the most astonishing claims made by a new entrant into the Milwaukee ISP market, about how some of the other ISP's shared lines between customers and this decreased your speeds. They had no clue who I was, so I engaged their technical person for a while who set out to convince me that other ISP's really _did_ do this mythical line- sharing - multiple modems to one port. Until I started talking about the technical aspects, that is. Not so mythical. Around the same time period, we found out about an ISP offering always-on ISDN BRI service for such a low price that it could not possibly make sense. We wondered how they could make ends meet at that rate until we found out how they did it. They daisy chained multiple customers' BRI lines together, using the second B channel from one customer to connect the next customer down the line. Once, one of their customers switched to our service and we reconfigured their router (a legitimate action: both router and BRI line belonged to the customer). Who knows how many downstream customers we broke by doing that. -Phil
