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Bug 1354575

Summary:	Client-Hostname option not syncing in secondary server's dhcp.leases file
Product:	Red Hat Enterprise Linux 7	Reporter:	SHAURYA <sshaurya>
Component:	dhcp	Assignee:	Pavel Zhukov <pzhukov>
Status:	CLOSED NOTABUG	QA Contact:	Release Test Team <release-test-team-automation>
Severity:	high	Docs Contact:
Priority:	medium
Version:	7.2	CC:	sshaurya, thozza
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-05-19 06:31:46 UTC	Type:	Bug
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:	1298243, 1380362, 1393869

Description SHAURYA 2016-07-11 15:29:19 UTC

Description of problem: Client-Hostname option not syncing in secondary server's dhcp.leases file

dhcpd.leases file primary
lease 10.12.202.96 {
  starts 4 2016/06/09 08:44:10;
  ends 4 2016/06/09 08:44:20;
  tstp 4 2016/06/09 14:44:15;
  tsfp 4 2016/06/09 14:44:15;
  atsfp 4 2016/06/09 14:44:15;
  cltt 4 2016/06/09 08:44:10;
  binding state active;
  next binding state expired;
  hardware ethernet 00:1a:xx:xx:xx:xx;
  uid "\001\000\032\350\207@\252";
  client-hostname "xxxx";
}

dhcpd.leases file secondary
lease 10.12.202.96 {
  starts 4 2016/06/09 08:44:10;
  ends 4 2016/06/09 08:44:20;
  tstp 4 2016/06/09 08:41:10;
  tsfp 4 2016/06/09 14:44:15;
  atsfp 4 2016/06/09 14:44:15;
  cltt 4 2016/06/09 08:29:34;
  binding state active;
  next binding state expired;
  hardware ethernet 00:1a:xx:xx:xx:xx;
  uid "\001\000\032\350\207@\252";
}

So as one can see the option doesn't sync automatically. But when the dhcp.leases file is renamed on secondary server and service is restarted on both the server the option syncs. But again when a new client gets an IP address it doesn't sync.


Version-Release number of selected component (if applicable): dhcp-4.2.5-42.el7.x86_64


How reproducible: Everytime


Steps to Reproduce:
1. Create a DHCP primary and secondary server
2. Allow clients to get an IP from primary dhcp server and check dhcp.leases file. Depending on client it might send client-hostname option and might not. If it is there then check dhcp.leases file on secondary server
3.The secondary dhcp server will have all the lease informatioon except client-hostname option in it

Actual results: client-hostname option not syncing in secondary dhcp server's dhcp.leases file


Expected results: client-hostname option should also sync along with all other lease info on secondary dhcp server's dhcp.leases file. 


Additional info:

Please check these forums. They are having same issue.

https://lists.isc.org/pipermail/dhcp-users/2009-February/008432.html
https://forum.pfsense.org/index.php?topic=81711.0

Comment 20 Pavel Zhukov 2017-05-19 06:31:46 UTC

In current implementation neither ddns nor request options are being sent to the peer [1][2]. It's not good but not a bug by itself. RFC (draft) doesn't require it either. So the problem most likely in client not sending option 12 in DHCPREQUEST. On the other hand it's not mandatory. 

As it's only visibility issue (no real harm for users) I'm closing this bug report.

[1]
dhcp/server/failover.c::isc_result_t%20dhcp_failover_send_bind_update

&skip_failover_option,	/* XXX DDNS */
&skip_failover_option,	/* XXX request options */
&skip_failover_option,	/* XXX reply options */

[2]
(bndupd (client-last-transaction-time<8> 1494919278)
 (start-time-of-state<8> 1494919278)
 (potential-expiration-time<8> 1494919368)
 (lease-expiration-time<8> 1494919338)
 (client-hardware-address<11> 1 178 227 166 117 133 110)
 (binding-status<5> 2) (assigned-IP-address<8> 192.168.78.144)
)


[3] http://www.networksorcery.com/enp/protocol/bootp/option012.htm