Micah Cowan wrote: > There is no software anywhere that would ever do a DNS lookup before > each packet in a TCP connection. For one thing, that would be just > ridiculously expensive, at least doubling the number of packets being > sent out, and imposing huge delays as the application waits for the DNS > response. For another, once a TCP connection is established, all packets > must necessarily be between the same IP addresses. A "connection" is > defined by an address/port pair on each end. If you change any of those, > it's not the same connection anymore. Thirdly, once a connection has > been established, the system kernel typically handles all the low-level > packet sending, not the application. So, it really wouldn't make sense > to have an option that controls DNS querying between packets for a > single connection. > > As Diego indicated, wget caches DNS values by default, to enhance > efficiency. If this is not the behavior you desire, you should use the > --no-dns-cache option. > > ...However, I think your point that wget ought "to do everything it can" > to succeed in reestablishing connection is a valid one. In the situation > you've described, it's not possible for wget to avoid losing the initial > connection, but if it fails in its second attempt, it should possibly > attempt a DNS lookup. I'll go ahead and confirm this bug (I'm actually > the upstream maintainer… as of yesterday!). I'll set the priority low, > though, as there is a simple workaround (--no-dns-cache), and I have > other things that will keep me busy for a while. :) > > ** Changed in: wget (Ubuntu) > Importance: Undecided => Low > Assignee: (unassigned) => Micah Cowan > Status: New => Triaged > Thanks for listening.
-- wget doesn't redo DNS lookup https://bugs.launchpad.net/bugs/84104 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
