-- Hi all :) At 05:40 18/11/2003 -0800, Simon Garner wrote:
>For an ISP there is really no point in having a DNS server hosted >elsewhere. If the ISP's network goes down, preventing access to the >local DNS servers, then customers aren't going to be able to access the >remote DNS server either. And for going the other way, e.g. web hosting, >there's not much point in being able to resolve the site's IP if the >site is down. Not true. A negative cached entry is as problematic. Especially where ISPs use extended bogus TTLs to reduce their DNS traffic. Distributed Primary / Secondary authoritive DNS servers are especially important in Round-Robin DNS configurations whereby Primary (Site A) only gives IPs for it's local hosts and Secondary (Site B) likewise. In times of network loss at Site A the Site B will take the strain and continue as normal with only a slight delays where Site A's server times out and the Site B's queried. But don't count out the use in standard DNS configurations. My ISP is Zen.co.uk and toward the beginning of this year they were hit hard by a DDoS attack on their authoritive nameservers. However they have an authoritive nameserver at BT.com hence although their nameservers where unreachange (and a lot of network due to sheer volume of traffic) lookups for hosts in the Zen.co.uk domain resolved correctly and those servers on unaffected subnets worked correctly for internal / external traffic. A good reason for using DNS in Steam is Round Robin DNS. If the content servers were to become even more highly overloaded beyond projection extra servers could be put into use and require only DNS additions to a Round-Robin configuration. No changes would be required of the Steam clients or servers. The current configuration would require all Steam clients to download an update to recognise the new content servers - thus causing more demand. YMMV / IMHO ... blah blah :) Regards, Matthew Palmer :) -- _______________________________________________ To unsubscribe, edit your list preferences, or view the list archives, please visit: http://list.valvesoftware.com/mailman/listinfo/hlds_linux
