Hi. I don't see how resolvconf could be responsible for this problem. Initial observation: it seems that dig gets the correct answer from dnsmasq when it supplies the additional option udp:1280, but the glibc resolver doesn't get the right answer from dnsmasq when it fails to supply that option. Reassigning to dnsmasq.
** Package changed: resolvconf (Ubuntu) => dnsmasq (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to resolvconf in Ubuntu. https://bugs.launchpad.net/bugs/1466608 Title: Unable to resolve domains with large EDNS0 replies Status in dnsmasq package in Ubuntu: New Bug description: Not sure resolvconf is the correct place to report this bug, but I'm unable to resolve domains with large EDNS0 replies. A couple of examples are www.sciencedaily.com and www.ncbi.nlm.nih.gov. Interestingly, they resolve when I use "dig <domain>", but if I enter a URL with either of those domains in my browser (tried Chromium and Firefox), then name resolution fails. Ping also fails with a name resolution error message. Here's an example: $ dig www.ncbi.nlm.nih.gov ; <<>> DiG 9.9.5-3ubuntu0.2-Ubuntu <<>> www.ncbi.nlm.nih.gov ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8409 ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags: do; udp: 1280 ;; QUESTION SECTION: ;www.ncbi.nlm.nih.gov. IN A ;; ANSWER SECTION: www.ncbi.nlm.nih.gov. 2358 IN CNAME www.wip.ncbi.nlm.nih.gov. www.ncbi.nlm.nih.gov. 2358 IN RRSIG CNAME 7 5 86400 20151213102025 20150616102025 52670 ncbi.nlm.nih.gov. dZt9uuyLImbB23vdqcsSK+nWK77BREttiAP80Ovq2/xV48JsII3Uxzxc W8OkLmc5dSdPNkfwc6QFC/+wqe+4ORb1TC4Qxw5HQxo4nCindPFGZAgJ SEFcWRJ2HrU5BKz/MeVMALJ3YN6LSHIwkTIwJbKweTGLQTZPZTryp1M7 UQrqd0hs7tjjwVl/6zRIA5UGgFbdrLwX9jmh4ykBTqK8u0Rt/wrTeHbp UpVMxAUdUW1CJ7xAnn/k4td6zdx7Tm5+CkS99Qva0cPfSSo6Qh4Uplun LKwT9GR4zqBTQRjBWSTf2YdhrAU8oyh9WbQ66WHLYkC8Kp55iskL8E8p E5wOYA== www.wip.ncbi.nlm.nih.gov. 30 IN A 130.14.29.110 www.wip.ncbi.nlm.nih.gov. 30 IN RRSIG A 7 6 30 20150708223631 20150617223631 34334 wip.ncbi.nlm.nih.gov. aF9abjtGNMz+8NkcTGIY8GwjfZBCcL532B2sdJM891OAP2V9GwPCDGNY VzMPzZjMGN9qHsBgXuFY5jZQNWFvWfIQctTJEZTxClyJyFhe5JbyIspg NIO6ZXxjD3h7Ax/Sr5peyf8mfCU/8FZHPGJOhsNEFOwL3RjIddTK6Ibc PQ55CWOuVrvw26kKj9gxBG8r6iBcKe89xHQYPm1w+Osp8c2twGhqBmfd 7zcRxFLyF0BpY63kcQiF5lJ2fI31x+zCAROL9H3L1jm/K7aMAiO5kuWl DK57upsmtQNzjWX8coYpm7/3Gebfmpjx4BtC75L5IP/WfwVBfzHeRjAG KY/7aQ== ;; Query time: 132 msec ;; SERVER: 127.0.1.1#53(127.0.1.1) ;; WHEN: Thu Jun 18 20:26:50 CEST 2015 ;; MSG SIZE rcvd: 699 $ ping www.ncbi.nlm.nih.gov ping: unknown host www.ncbi.nlm.nih.gov I also watched with tcpdump when trying to look up the domain www.sciencedaily.com, and when I use dig I immediately get the reply, but when trying with ping I don't get any reply, and it gives up after 4 queries are sent. Must have something to do with the DNS flags that are set on the query in the different cases. Here's a lookup with dig: 20:01:47.857269 IP 127.0.0.1.56927 > 127.0.1.1.53: 9907+ [1au] A? www.sciencedaily.com. (49) 20:01:47.869516 IP 127.0.1.1.53 > 127.0.0.1.56927: 9907 2/6/43 CNAME ed5n3.x.incapdns.net., A 149.126.72.70 (879) and here's a name resolution triggered by running ping: 20:02:47.969527 IP 127.0.0.1.35905 > 127.0.1.1.53: 59118+ A? www.sciencedaily.com. (38) 20:02:52.974752 IP 127.0.0.1.35905 > 127.0.1.1.53: 59118+ A? www.sciencedaily.com. (38) 20:02:57.980296 IP 127.0.0.1.48738 > 127.0.1.1.53: 3668+ A? www.sciencedaily.com. (38) 20:03:02.985493 IP 127.0.0.1.48738 > 127.0.1.1.53: 3668+ A? www.sciencedaily.com. (38) I've not experienced this before, though these aren't domains I commonly visit. Is this a new issue? ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: resolvconf 1.69ubuntu1.1 ProcVersionSignature: Ubuntu 3.13.0-52.86-generic 3.13.11-ckt18 Uname: Linux 3.13.0-52-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.11 Architecture: amd64 CurrentDesktop: Unity Date: Thu Jun 18 20:23:19 2015 InstallationDate: Installed on 2014-10-19 (241 days ago) InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) PackageArchitecture: all SourcePackage: resolvconf UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1466608/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
