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Bug 73350

Summary:	Slow DNS lookups for some sites
Product:	[Retired] Red Hat Linux Beta	Reporter:	Joe Orton <jorton>
Component:	apr	Assignee:	Joe Orton <jorton>
Status:	CLOSED RAWHIDE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	low
Version:	alpha 1
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:	0.9.3-7	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2003-10-06 14:46:34 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:

Description Joe Orton 2002-09-03 11:21:42 UTC

Description of Problem:
By default, since RHL is an IPv6-capable system, APR passes AF_UNSPEC in the
getaddrinfo hints.  For some sites, the DNS queries for the AAAA record
generated by getaddrinfo() are ignored and get no responses; this can be seen on
www.bloomberg.com, for instance, resulting in retries and timeouts before the A
record is attempted.

Version-Release number of selected component (if applicable):
httpd-2.0.40-6

How Reproducible:
Always

Steps to Reproduce:
1. Add "ProxyRequests On" to default config + LoadModule lines for proxy
2. Configure browser to use server as proxy
3. Go to www.bloomberg.com

Actual Results:
Page is very slow to load

Expected Results:
Page is fast to load, as can be seen when not using the proxy

Additional Information:
Daniel Stenberg (of curl fame) has a tip on how to avoid this: if
socket(AF_INET6, ...) fails, then just pass AF_INET in the getaddrinfo
hints rather than AF_UNSPEC, since the IPv6 module is not loaded.

Comment 1 Joe Orton 2003-06-10 08:39:00 UTC

A proper solution for this is possible in modern glibc; passing AI_ADDRCONFIG in
the getaddrinfo hints.