On Jun 29, 2011, at 11:51 AM, William Hopkins wrote: > On 06/29/11 at 10:15am, ChadDavis wrote: >> Not a big deal, but just made me think. Surely the name resolution >> isn't that costly is it? > > Depends on latency and distance to your DNS server, how long it takes the DNS > server to perform the recursive query or forward to a server which does, > whether you have the answer cached locally or at any of the servers along the > way, etc. So it can vary wildly.
Exactly. If you keep a well populated /etc/hosts, it'll be snappy as hail -- it's a disk hit (if your resolver is configured to go to hosts first, and you keep hosts updated). If your computer has to go to your ISP for cached info, that's a 'Net hit, and can take some time, depending on your latency and bandwidth. If your ISP doesn't have the lookup cached, there are several 'Net hits involved. If you have a cacheing DNS server locally, you can save significant time on DNS lookups -- cached stuff is (best case) a RAM hit, worst case, Ethernet. For a good time, 'apt-get install bind' :-) -- Glenn English -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/1ce428af-0ff0-42c4-b216-9f606d431...@slsware.com
