Bug 1257743

Summary:	a default dhclient.conf needed or alert user to create one; LAN dhcp errors
Product:	[Fedora] Fedora	Reporter:	Ronald L Humble <deadletterfile>
Component:	dhcp	Assignee:	Jiri Popelka <jpopelka>
Status:	CLOSED EOL	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	23	CC:	jpopelka, thozza
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Fixed In Version:		Doc Type:	Bug Fix
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Last Closed:	2016-12-20 14:29:59 UTC	Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description Ronald L Humble 2015-08-27 20:15:20 UTC

Description of problem: Missing /etc/dhcp/dhclient.conf causes wild assignment of dynamic IP addresses in spite of router DHCP server configuration to dynamically assign the same IP to the same hardware.

Version-Release number of selected component (if applicable):
dhcp-client-4.3.3-0.1b1.fc23.x86_64

How reproducible: router dhcp server set to assign the same IP to the same hardware via dhcp. Missing dhclient.conf causes erratic unexpected IP assignments.

Steps to Reproduce:
1. Configure router dhcp server to assign the same hardware the same IP address
2. Missing dhclient.conf causes unexpected IP assignment.
3.

Actual results:
"host" command on LAN addresses or 127.0.0.1 produces erroneous results. Client/server software such as BackupPC and Apache fail to work reliably due to variable IP assignment to server hardware.

Expected results: router's dhcp server assigns IP addresses to specific hardware as expected when properly configured. Client/server programs work as expected before and after reboots of the server.

Additional info:
http://www.linuxquestions.org/questions/linux-hardware-18/2wire-at-and-t-router-lan-dns-table-lookup-error-4175420691/

dhclient.conf file containing one line:
send dhcp-client-identifier = hardware;
fixes my problem (though this is surely too simple). My router properly provides the IP address configured in the router dhcp server. As long as ALL clients using dhcp have a dhclient.conf file, all networking LAN and WAN work as expected.

If a default conf file is not provided, the user should perhaps be alerted to create one.

Comment 1 Jiri Popelka 2015-08-28 10:34:32 UTC

Looks like duplicate of bug #1154200.

tl;dr: We now send client-identifier per RFC 4361, but some routers seem to have problems with that.

Comment 2 Fedora End Of Life 2016-11-24 12:23:49 UTC

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Comment 3 Fedora End Of Life 2016-12-20 14:29:59 UTC

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