Bug 860829
| Summary: | Grub2 can't resolve names on F18 | ||||||||
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| Product: | [Fedora] Fedora | Reporter: | IBM Bug Proxy <bugproxy> | ||||||
| Component: | grub2 | Assignee: | Peter Jones <pjones> | ||||||
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||||
| Severity: | medium | Docs Contact: | |||||||
| Priority: | unspecified | ||||||||
| Version: | 18 | CC: | bcl, dcantrell, dennis, gustavold, jkachuck, mads, pjones, wgomerin | ||||||
| Target Milestone: | --- | ||||||||
| Target Release: | --- | ||||||||
| Hardware: | ppc64 | ||||||||
| OS: | All | ||||||||
| Whiteboard: | |||||||||
| Fixed In Version: | grub2-2.00-10.fc18 | Doc Type: | Bug Fix | ||||||
| Doc Text: | Story Points: | --- | |||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2012-10-30 20:30:43 UTC | Type: | --- | ||||||
| Regression: | --- | Mount Type: | --- | ||||||
| Documentation: | --- | CRM: | |||||||
| Verified Versions: | Category: | --- | |||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||
| Embargoed: | |||||||||
| Bug Depends On: | |||||||||
| Bug Blocks: | 846990 | ||||||||
| Attachments: |
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Description
IBM Bug Proxy
2012-09-26 20:02:32 UTC
Created attachment 618761 [details] Workaround to fix DNS lookup (ipv4 only) ------- Comment on attachment From gusld.com 2012-09-28 20:50 EDT------- After some investigation I found that this issue is caused by GRUB2 assembling 2 questions (ipv4 and ipv6) on a single DNS packet. BIND does not support it, and my tests suggest that dnsmasq also doesn't when resolving local domains. The reason why BIND doesn't support multiple questions per query is due to potential ambiguity on partial results. You can find some discussions on the following links. These discussions are a bit old but I can confirm that latest stable release of BIND still doesn't support multiple questions per query. https://lists.isc.org/pipermail/bind-users/2010-December/082304.html http://stackoverflow.com/questions/4082081/requesting-a-and-aaaa-records-in-single-dns-query https://groups.google.com/forum/?fromgroups=#!topic/comp.protocols.dns.bind/uOWxNkm7AVg As a proof of concept, I've written and tested the attached patch which basically drops ipv6 question from GRUB's DNS queries. This makes ipv4 DNS work fine, though drops ipv6 DNS support. I've only tested on ppc64, but this issue probably affects all arches, since the code is not arch-specific. I will work on a more appropriate patch to make GRUB send 2 separate queries for ipv4 and ipv6. I would appreciate any comments/suggestions. Created attachment 628205 [details]
[PATCH] Issue separate DNS queries for ipv4 and ipv6
------- Comment on attachment From gusld.com 2012-10-16 14:59 EDT-------
Sorry, forgot to mention the bugz number in the patch.
grub2-2.00-10.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/grub2-2.00-10.fc18 Package grub2-2.00-10.fc18: * should fix your issue, * was pushed to the Fedora 18 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing grub2-2.00-10.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-16471/grub2-2.00-10.fc18 then log in and leave karma (feedback). grub2-2.00-11.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/grub2-2.00-11.fc18 Tested grub2-2.00-11.fc18 and it works fine. |