DHCP Failover Auto Config Sync
Downloaded most current version of script and set it up in lab. It works but the log file (.\dhcpautosynclogfile.txt) is growing at a fast rate. Entries for sync complete and automatically sync again are being posted at rate of 3 or 4
times per second.
Script is the DHCP Failover Auto Config Sync script.
Questions is - why is log file filling at such an alarming rate ?
And what script is that? Who wrote it? Have you contacted the author?
Believe it or not, we haven't heard of every script ever written. =]
EDIT: Is this what you're referring to?
http://gallery.technet.microsoft.com/scriptcenter/Auto-syncing-of-configurati-6eb54fb0
If so, post your question on the QandA tab so the author will see it.
Don't retire TechNet! -
(Don't give up yet - 12,830+ strong and growing)
Similar Messages
-
TCP connection for DHCP failover frequently are broken in Solaris 10
Hi
We have two dhcp servers which are installed in Solaris 10 and set to a failover pair. Currently, we can find that tcp connection for dhcp failover protocol are frequently broken. It looks like that primary dhcp server initiatively send FIN message to secondary one but in general, this tcp connection should always keep alive. On the other hand, the tcp connection can not completely be closed right now which FIN_WAIT_2 status in Primary one and CLOSE_WAIT status in secondary would last for a long time.
Will Solaris 10 cause this fault? Is it a known bug in OS?
OS info:
-bash-3.00$ cat /etc/release
Solaris 10 5/08 s10s_u5wos_10 SPARC
Copyright 2008 Sun Microsystems, Inc. All Rights Reserved.
Use is subject to license terms.
Assembled 24 March 2008
-bash-3.00$
-bash-3.00$
-bash-3.00$ uname -a
SunOS edns1 5.10 Generic_142900-03 sun4v sparc SUNW,Netra-T5220
TCP connection info:
Primary DHCP Server:
2012 08 29 03:41:43
PING 172.25.6.137: 56 data bytes 64 bytes from edns2 (172.25.6.137): icmp_seq=0. time=0.678 ms
remote refid st t when poll reach delay offset disp
==============================================================================
*idns1 195.26.151.151 3 u 45 1024 377 0.75 -0.071 0.05
+idns2 195.26.151.151 3 u 162 1024 377 0.93 0.169 0.08
clusternode1-pr 0.0.0.0 16 - - 1024 0 0.00 0.000 16000.0
+clusternode2-pr idns1 4 u 406 1024 376 0.49 -0.154 15.12
172.25.6.133.647 172.25.6.137.58107 49640 0 49640 0 ESTABLISHED
172.25.6.133.647 *.* 0 0 49152 0 LISTEN
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2012 08 29 03:41:47
PING 172.25.6.137: 56 data bytes 64 bytes from edns2 (172.25.6.137): icmp_seq=0. time=0.535 ms
remote refid st t when poll reach delay offset disp
==============================================================================
*idns1 195.26.151.151 3 u 49 1024 377 0.75 -0.071 0.05
+idns2 195.26.151.151 3 u 166 1024 377 0.93 0.169 0.08
clusternode1-pr 0.0.0.0 16 - - 1024 0 0.00 0.000 16000.0
+clusternode2-pr idns1 4 u 410 1024 376 0.49 -0.154 15.12
172.25.6.133.647 172.25.6.137.58107 49640 0 49640 0 FIN_WAIT_2
172.25.6.133.647 *.* 0 0 49152 0 LISTEN
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Secondary DHCP Server:
2012 08 29 03:41:41
PING 172.25.6.133: 56 data bytes 64 bytes from edns1 (172.25.6.133): icmp_seq=0. time=1.26 ms
remote refid st t when poll reach delay offset disp
==============================================================================
*idns1 195.26.151.151 3 u 450 1024 377 0.92 -0.067 0.06
+idns2 195.26.151.151 3 u 552 1024 377 0.96 0.237 0.08
+clusternode1-pr idns1 4 u 360 1024 377 1.85 -0.528 1.51
clusternode2-pr 0.0.0.0 16 - - 1024 0 0.00 0.000 16000.0
172.25.6.137.647 *.* 0 0 49152 0 LISTEN
172.25.6.137.58107 172.25.6.133.647 49640 0 49640 0 ESTABLISHED
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2012 08 29 03:41:45
PING 172.25.6.133: 56 data bytes 64 bytes from edns1 (172.25.6.133): icmp_seq=0. time=1.36 ms
remote refid st t when poll reach delay offset disp
==============================================================================
*idns1 195.26.151.151 3 u 454 1024 377 0.92 -0.067 0.06
+idns2 195.26.151.151 3 u 556 1024 377 0.96 0.237 0.08
+clusternode1-pr idns1 4 u 364 1024 377 1.85 -0.528 1.51
clusternode2-pr 0.0.0.0 16 - - 1024 0 0.00 0.000 16000.0
172.25.6.137.647 *.* 0 0 49152 0 LISTEN
172.25.6.137.58107 172.25.6.133.647 49640 0 49640 0 CLOSE_WAIT
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Thanks!Thanks, but had found a previous discussion with this hint and applied it.
svccfg -s sendmail listprop shows config /local_only = false
Yes, I would really love to fix the fault, but what I would really like is some hints as to how to debug ports under svc control. -
How to test Windows 2012 R2 DHCP Failover without shutting down the service?
How can I test the Win2012R2 DHCP Failover?
There is a command or script, that i could use to test if DHCP failover is working properly?
How to monitor the sync of the objects?
How to make sure that it will do the job, if required?
Or i have to really stop DHCP server main server and see the failover?Hello,
you have to keep in mind that this has ONLY effect for machines that request during the downtime a lease. So if your lease time is for example 8 hours a computer will ask after 4 hours for the renewal of the lease.
Means there is no problem for running machines during the test. You just need a computer to start after the service is shutdown on the first DHCP server, should take only some minutes to check if the fail over works. Then you could already start the service
again if you see the lease on the new server.
Best regards
Meinolf Weber
MVP, MCP, MCTS
Microsoft MVP - Directory Services
My Blog: http://blogs.msmvps.com/MWeber
Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.
Twitter: -
DHCP Failover feature in Windows 2012
I am planning to configure DHCP on windows 2012 failover (Load balanced)mode.Just want to confirm two things:
1.How will the DCHP address be assigned to clients incase the DHCP Servers loose communication between them.
2.Regarding IP helpers that i need to put onto my network switches would it be Ips for both the server or does configuration of failover feature uses single IP (as is used in cluster config)Hi,
Sorry for the delay. I think we need to get more people monitoring this forum :)
Your questions are answered in documentation here:
http://technet.microsoft.com/en-us/library/dn338978.aspx.
From DHCP Failover Modes:
In load balancing mode, when a DHCP server loses contact with its failover partner it will begin granting leases to all DHCP clients. If it receives a lease renewal request from a DHCP client that is assigned to its failover partner, it will temporarily
renew the same IP address lease for the duration of the MCLT. If it receives a request from a client that was not previously assigned a lease, it will grant a new lease from its free IP address pool until this is exhausted, and then it will begin using the
free IP address pool of its failover partner. If the DHCP server enters a partner down state, it will wait for the MCLT duration and then assume responsibility for 100% of the IP address pool.
From DHCP Failover Architecture:
When you deploy DHCP failover, a single DHCP relay address might not be sufficient, since DHCP clients must always be able to communicate with both the primary DHCP server and the failover partner server. If both DHCP servers are located on a different subnet
than DHCP clients, this requires at least two DHCP relay agents. For example:
ip helper-address 10.0.1.1
ip helper-address 10.0.1.2
In this example, both DHCP servers are on the same subnet (10.0.1.0/24). The primary DHCP server’s IP address is 10.0.1.1 and 10.0.1.2 is the IP address for the failover partner server. If both DHCP servers are located on the same subnet, you can also configure
the subnet broadcast address (ex: 10.0.1.255) as a single DHCP relay. The use of a subnet broadcast address as a single DHCP relay is not possible if DHCP servers are located on separate subnets.
-Greg -
Problem with config sync between two CSM-S modules
Hi everybody,
I have a problem with config sync between two CSM-S modules.
I am using CSM-S software version 2.1(8).
The acitve module is used in a 6509 with WS-SUP720-BASE supervisor running software version 12.2(18)SXF12a.
The standby module is used in a 6509-V with VS-S720-10G supervisor (no VSS setup) running software version 12.2(33)SXI3.
Failover seems to work fine:
switch-active#sh modu csm 2 ft
FT group 1, vlan 398
This box is active
Configuration is out-of-sync
priority 150, heartbeat 3, failover 40, preemption is on
switch-standby# sh modu csm 2 ft
FT group 1, vlan 398
This box is in standby state
Configuration is out-of-sync
priority 80, heartbeat 3, failover 40, preemption is on
The command (on active side) "hw-module contentSwitchingModule 2 standby config-sync" leads to following result:
switch-active:
2010-04-14T16:21:45+02:00 srz16-1b.net.dsh.at/srz16-1b.net.dsh.at 56042: Apr 14 16:21:44.223: %CSM_SLB-6-REDUNDANCY_INFO: Module 2 FT info: Active: Bulk sync started
2010-04-14T16:21:45+02:00 srz16-1b.net.dsh.at/srz16-1b.net.dsh.at 56043: Apr 14 16:21:44.251: %CSM_SLB-6-REDUNDANCY_INFO: Module 2 FT info: Active: Sending configurations to Standby CSM, this may take several minutes!
2010-04-14T16:21:46+02:00 srz16-1b.net.dsh.at/srz16-1b.net.dsh.at 56044: Apr 14 16:21:45.995: %CSM_SLB-6-REDUNDANCY_INFO: Module 2 FT info: Active: Sending configuration to Standby CSM
2010-04-14T16:21:51+02:00 srz16-1b.net.dsh.at/srz16-1b.net.dsh.at 56045: Apr 14 16:21:50.831: %CSM_SLB-6-REDUNDANCY_INFO: Module 2 FT info: Active: Sending configuration to Standby CSM
2010-04-14T16:21:57+02:00 srz16-1b.net.dsh.at/srz16-1b.net.dsh.at 56046: Apr 14 16:21:56.151: %CSM_SLB-6-REDUNDANCY_INFO: Module 2 FT info: Active: Sending configuration to Standby CSM
2010-04-14T16:22:59+02:00 srz16-1b.net.dsh.at/srz16-1b.net.dsh.at 56047: Apr 14 16:22:58.791: %CSM_SLB-3-REDUNDANCY: Module 2 FT error: Active: Manual bulk sync timed out
2010-04-14T16:22:59+02:00 srz16-1b.net.dsh.at/srz16-1b.net.dsh.at 56048: Apr 14 16:22:58.803: %CSM_SLB-3-REDUNDANCY: Module 2 FT error:
2010-04-14T16:22:59+02:00 srz16-1b.net.dsh.at/srz16-1b.net.dsh.at 56049: FT CONFIG SYNC: Failed config sync entity send
switch-standby:
2010-04-14T16:21:45+02:00 srz31-5a.net.dsh.at/srz31-5a.net.dsh.at 2475: Apr 14 16:21:44.232: %CSM_SLB-6-REDUNDANCY_INFO: Module 2 FT info: Standby: Bulk sync started
2010-04-14T16:21:45+02:00 srz31-5a.net.dsh.at/srz31-5a.net.dsh.at 2476:
2010-04-14T16:21:45+02:00 srz31-5a.net.dsh.at/srz31-5a.net.dsh.at 2477: Apr 14 16:21:44.240: %CSM_SLB-6-REDUNDANCY_INFO: Module 2 FT info: STANDBY:Configuration is being received, This may take several minutes!
2010-04-14T16:21:49+02:00 srz31-5a.net.dsh.at/srz31-5a.net.dsh.at 2478: Apr 14 16:21:48.824: %CSM_SLB-6-REDUNDANCY_INFO: Module 2 FT info: Standby: Receiving configuration from Active CSM
2010-04-14T16:21:54+02:00 srz31-5a.net.dsh.at/srz31-5a.net.dsh.at 2479: Apr 14 16:21:53.964: %CSM_SLB-6-REDUNDANCY_INFO: Module 2 FT info: Standby: Receiving configuration from Active CSM
2010-04-14T16:21:59+02:00 srz31-5a.net.dsh.at/srz31-5a.net.dsh.at 2480: Apr 14 16:21:58.852: %CSM_SLB-6-REDUNDANCY_INFO: Module 2 FT info: Standby: Started clearing configuration
2010-04-14T16:21:59+02:00 srz31-5a.net.dsh.at/srz31-5a.net.dsh.at 2481: Apr 14 16:21:59.400: %CSM_SLB-4-REDUNDANCY_WARN: Module 2 FT warning: Standby: Config Sync does not save running-config to startup-config
2010-04-14T16:22:00+02:00 srz31-5a.net.dsh.at/srz31-5a.net.dsh.at 2482: Apr 14 16:21:59.400: %CSM_SLB-6-REDUNDANCY_INFO: Module 2 FT info: Standby: Previous configuration are being deleted from supervisor
The last log message on standby device seems to be correct - there is no CSM configuration after the attempted config sync.
Our configuration includes about 3500 lines and it is really uncomfortable to keep in sync manually.
Maybe someone has the same problem?
kind regards,
ChristophHi Christoph,
I am running into the exact same issue. Upon further investigation I've discovered that this is a known bug, CSCtd09117. You can read more about it here: http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtd09117 . Apparently this is fixed in ver 12.2(32.8.11)SX323 .
I haven't had a chance to upgrade yet, so I can't verify the fix, but if it works for you please let me know.
Regards,
Brandon -
5548 Config Sync issue - Suspended by vPC
I have 2 UCS 6120 fabric interconnects which both have VPCs to 2 x 5548s. First fabric interconnect uses Po260 & vPC 260 and second fabric interconnect uses Po261 & vPC 261. I used config sync to add "spanning-tree port type edge trunk" to int po 260 & 261. The commit worked properly, peers are in sync, etc. The problem is when I committed the command, int po 260 & 261 on the secondary 5548 went into "suspended by vPC". I can't figure out why they did this, the configurations are the same and all vPC consistency checks pass. To fix the issue, all I had to do was bounce the port-channel on the secondary 5548 (shut/no shut) after which it came back online. I only did this to Po260 so Po261 is still down so that I can troubleshoot further. Please see below:
vPC domain id : 70
Peer status : peer adjacency formed ok
vPC keep-alive status : peer is alive
Configuration consistency status : success
Per-vlan consistency status : success
Type-2 consistency status : success
vPC role : secondary
Number of vPCs configured : 7
Peer Gateway : Disabled
Dual-active excluded VLANs : -
Graceful Consistency Check : Enabled
Auto-recovery status : Disabled
vPC Peer-link status
id Port Status Active vlans
1 Po255 up 1,10-13,26-29,151-156,180-181,200,318,331,399-417,
419-422,424-431,433-436,438-443,446-448,450,452-45
3,455-458,460-465,467-471,480-494,498-499,503,602-
633,644-657,659,663-664,698-701,800,805,850-851,89
0-891,899-904,906,908,912-950,952-958,975,987-988, ....
vPC status
id Port Status Consistency Reason Active vlans
171 Po171 up success success 1,10-13,26-
29,151-156,
180-181,200
,318,331,39
9-417,41....
260 Po260 up success success 10-13,26-29
,663-664,89
0-891
261 Po261 down* success success -
sh int po 261
port-channel261 is down (suspended by vpc)
Any help would be appreciatedYes, I did check that and all parameters match as follows:
5548-2# sh vpc consistency-parameters int po 261
Legend:
Type 1 : vPC will be suspended in case of mismatch
Name Type Local Value Peer Value
Shut Lan 1 No No
STP Port Type 1 Edge Trunk Port Edge Trunk Port
STP Port Guard 1 None None
STP MST Simulate PVST 1 Default Default
lag-id 1 [(7f9b, [(7f9b,
0-23-4-ee-be-46, 8105, 0-23-4-ee-be-46, 8105,
0, 0), (8000, 0, 0), (8000,
0-5-73-d4-d5-fc, 1, 0, 0-5-73-d4-d5-fc, 1, 0,
0)] 0)]
mode 1 active active
Speed 1 10 Gb/s 10 Gb/s
Duplex 1 full full
Port Mode 1 trunk trunk
Native Vlan 1 10 10
MTU 1 1500 1500
Admin port mode 1
Allowed VLANs - 10-13,26-29,663-664,89 10-13,26-29,663-664,89
0-891 0-891
Local suspended VLANs - - - -
CSS11501 Hangs during Config Sync
We have CSS11501 boxes in redundancy mode. Until now, the config sync process happened without any issues. For the last two occassions, the CSS hangs completely during manually initiated config sync thereby bringing down all active connections..After the sync is completed, the box returns back to normal.
The only changes made in recent time is the Redundancy config (failover from master to backup forcefully)..
Any know issues on the following bundle:-
Version: sg0810002 (08.10.0.02)
Flash (Locked): 07.40.0.04
Flash (Operational): 08.10.0.02
Type: PRIMARY
Licensed Cmd Set(s): Standard Feature SetHi, I will check to see if your are hitting any know issue but let me tell you that 8.10.002 is the first release of 8.10 code and we have 8.10.301 already which would be the best way to go at this point.
I will update you with any know issue. It would be useful to see the showtechs when the issue is showing u.
Also when you say that hangs completely:
would no respond to ping to the VLAN IP?
is it accesible via telnet or ssh?
is it accesible via console?
What kind of redundancy are you using? do you see any failover at the time of the problem?
Can you show me the syntax you are using to sync the config?. -
Server 2012 R2 DHCP Failover - Hot Standby clients not renewing with standby server
In my test network I have a pair of Server 2012 R2 DHCP servers setup for Hot Standby and they will successfully service a client request for a new request.
What I am seeing is that when I test failover the clients will not renew with the Standby server. I have to release first and then renew.
When both DHCP servers are up the state is normal and replication of configuration from the Active to Standby is working. As far as I can tell it is configured correctly.
MaxClientLeadTime is 10 minutes.
StateSwitchInterval is 10 minutes.
AutoStateTransition is set to True.
Adding that manual renews fail with a message stating that it was unable to contact the dhcp server. However if I wait for the lease to expire/auto-renew the dhcp server does indeed change to the standby. Once the primary server comes back up and the state
returns to normal I am able to manually renew.
thanks in advance
Hi,
For test, we let the active DHCP down and the standby DHCP server will take place. But when we renew an IP, client send unicast to the former DHCP
server. That’s why the first request failed.
At 7/8 of the scope lease time, the client moves into a REBINDING state and broadcasts a lease renewal request.
For more information please refer to:
DHCP Failover Examples
http://technet.microsoft.com/en-us/library/dn338973.aspx
Hope this helps. -
IPv6 Auto config .. Servers getting two addresses...
Hi Guys,
Just trying to figure out what the "best" way is to enable auto config on a vlan..
Currently, I have ipv6 enabled and left the rest as default.
This means that servers get two /64 addresses.
One is from the local MAC address ( ie., its padded ff:fe )
One is an address from the vlans /64 , Ie its not padded but an actual address.
Now,
My question is..
Is this ok?
Should I be happy and leave it so server sget two addresses? or should I have some config in place that only allows them to autoconfig from MAC and not get another assigned?
Thanks for your feedback.
-Graham
Please note: My comments are simply suggestions. I cannot be held liable for any loss of data, life or marbles due to following my instructions.
Got a website? Need some live chat software?
Live chat software for websites. Increase sales.The main roles of the RA in IPv6 are to:
(1) exhibit the link-local gateway address of the sending router (this is not an RA option, and unlike v4, not a DHCPv6 option either)
(2) describe which prefixes are on-link; those will be resolved by clients using neighbor discovery, whereas all others will be forwarded to a gateway router.
The prefixes advertised by the router each have a flag bit indicating whether or not they are available for autoconfiguration. The RA also has global flag bits indicating whether or not the client should use DHCPv6; the M bit for managed addresses, and the O bit for other network configurations options. The usual combinations would be M-O- (no DHCP), M+O+ (full DHCP), or M-O+ (static DHCP, addresses are autoconfigured from the prefixes flagged as available). In practice most production network are running dual-stack with DHCPv4 and either static or SLAAC v6, partly because downlevel clients like windows XP and older OS-X either don't implement DHCPv6 at all, or get it wrong, not to mention the DHCPv6 problems in most consumer grade wifi gear.
The client controls whether it is doing static or dynamic addressing, and if dynamic how it picks its host part. EUI-64 mappings off the 48-bit ethernet MAC and privacy addresses are only two of its options; there are others.
In your case, I think you have to go with:
* router flags on-link prefixes as not available for autoconfiguration, tells clients to use managed addresses
* DHCPv6 server (not necessarily the router) hands out the v6 addresses you want
Most Cisco gear is willing to enforce EUI-64 mappings on host parts, if you want to be that draconian. Other v6 packets could get dropped.
-- Jim Leinweber, WI State Lab of Hygiene -
ASR ZBFW Config sync between routers?
I have been reading about, and will try to set up, Firewall Stateful Interchassis Redundancy for my edge ASR-1002-X routers. I have found the Config guide for that feature here and one of the prereqs is "The active device and the standby device must have the same Cisco IOS XE Zone-Based Firewall configuration," which makes sense.
What I can't find is how to keep the ZBFW config "in sync" between the routers.
I am assuming there is an automated way to do this, a la the ASA failover pair configuration sync process (a loose example, I grant), but I cannot find how to automate the sync. I am hoping this can be done for ONLY the ZBFW config, as the routers have different BGP configs, etc.
If there is not, does anyone know what happens while one is making changes to the ZBFW config on one or the other routers? Does this break the state sync?
Thanks for any help.
PaulHello Karien,
Not sure I get the question..
The definition you are looking I guess is this one:
A router can only inspect inter-VRF traffic if traffic must enter or leave a VRF through an interface to cross to a different VRF. If traffic is routed directly to another VRF, there is no physical interface where a firewall policy can inspect traffic, so the router is unable to apply inspection.
Based on that I would say that on each VRF there will need to be a dedicated security zone applied,
I will try to run a lab real quick tomorrow and get back to u,
Remember to rate all of the helpful posts. That's as important as a Thanks.
Julio Carvajal Segura -
Hi,
I have a Problem with DHCP Failover in Windows Server 2012
We configured 2 Windows Server 2012 with DHCP Role and created a Scope with loadbalancing algorithm.
The Problem is, that the two DHCP Servers Show different statistic Information. DHCP 1 has 254 addresses and 218 in use. DHCP Server 2 has 254 addressses and 187 in use.
We found situations when one DHCP Server has no available IP addresses and the other one has about 40% available addresses.
Why do the Servers have different available address spaces ? We have one scope with one class c net, 254 addresses.
Our Szenario is with this config not high available, cause of sometimes running out of IP addresses on one DHCP Server.
Thanks for help
Björn
Björn Schiemann LemonTec IT Systems KG htttp://www.lemontec.deHi Bjoern,
Would you please provide us your detailed load balance configurations.
In load-balance mode of operation both the servers respond to client requests. Here’s how the servers ensure the distribution of client requests between themselves:
Each DHCP server on receiving the client request calculates hash of the MAC address in the client request as per hashing algorithm specified in RFC 3074. Each server hashes any MAC address
to a value between 1 and 256. If the load distribution ratio between the 2 servers is left at the default of 50:50; and if the hash of the MAC address falls between 1 and 128 then the first server will respond to the client request else if the hash is any
value between 129 and 256, the other server responds to the client. This ensures that only one server responds for a specific client. If the load distribution ratio has been changed by the admin to a different value, the distribution of hash buckets would
be in that proportion. The admin does not need to configure the MAC addresses on any server configuration a-priori.
Quote from DHCP Failover Load Balance Mode
http://blogs.technet.com/b/teamdhcp/archive/2012/08/06/dhcp-failover-load-balancing-mode.aspx
In addition, I notice that you have a Class C network for the scope, why does each DHCP server have 254 IP address available?
Thanks.
Jeremy Wu
TechNet Community Support -
Windows 2012 DHCP Failover "Lost contact with partner"
We have stood up a pair of Windows 2012 DHCP servers and configured DHCP failover (in Load Balancing mode) as per the Microsoft Technet article. The two servers are on the same subnet, and time is in sync between them. Almost immediately after
configuring scopes to failover, one node loses contact with the other, and the alternate node goes to failover mode "Recover".
We have restarted both servers and services. Both DHCP servers show as available. Clicking "Replicate Failover Scopes" completes successfully with no errors, and the only two warnings in the Event Log are about credentials for Dynamic
DNS updates and a dynamic IPv6 address (which we don't use at all.)
How come they can replicate, but have "lost contact"; and how do we get the one out of "Recover" mode?You should see Recover state only if one of the DHCP server actually went down and came back up. In this case the server which comes back up would be in Recover state but will transition to Recover_Wait state and come back to Normal after it syncs it
leases. This should be relatively quickly. Did your servers continue to remain in the Lost Contact...\Recover state for long.
Did you see any events in the DHCP Server admin channel
Microsoft\Windows\DHCP Server\Admin.
You can also enable AuditLogs (Microsoft\Windows\DHCP
Server\AuditLogs) which logs all the server to server messages. You can enable the log by right clicking on
Microsoft\Windows\DHCP Server. View->Show Analytical and Debug Logs. This will show the
Microsoft\Windows\DHCP Server\AuditLogs in event viewer. You can then right click and enable the log and see if there are any failures
being logged there. -
Outlook 2010 Auto Config doesnt tick the "use outgoing mail server auth" settings
Hi Guys
I've got a domain here and an auto-config setup for Outlook whereby it goes to a website on the domain controller and downloads an xml looking like this:
<?xml version='1.0' encoding='utf-8' ?>
<Autodiscover xmlns='http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006'>
<Response xmlns='http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a'>
<User>
<DisplayName>User Name</DisplayName>
</User>
<Account>
<AccountType>email</AccountType>
<Action>settings</Action>
<Protocol>
<Type>IMAP</Type>
<Server>mail.host.com</Server>
<Port>143</Port>
<LoginName>[email protected]</LoginName>
<DomainRequired>off</DomainRequired>
<SPA>off</SPA>
<SSL>off</SSL>
<AuthRequired>on</AuthRequired>
</Protocol>
<Protocol>
<Type>SMTP</Type>
<Server>mail.host.com</Server>
<Port>25</Port>
<LoginName>[email protected]</LoginName>
<DomainRequired>off</DomainRequired>
<SPA>off</SPA>
<SSL>off</SSL>
<AuthRequired>on</AuthRequired>
<UsePOPAuth>on</UsePOPAuth>
<SMTPLast>on</SMTPLast>
</Protocol>
</Account>
</Response>
</Autodiscover>
As can be seen, we use IMAP here rather than exchange
Now, when I go to set up an account, outlook DOES configure most things presented in this XML, but there seems to be a bug in that while it knows and enables "My outgoing server(SMTP) requires authentication" checkbox, it DOESN'T then enable the relevant
radio button that one would assume <UsePOPAuth> (== use the same settings as my incoming server) intends.. No radio button is checked, which means that mails do NOT send :/
Here's a pic:
So, alas, my auto-setup still requires the depeest level of manual interaction to set it up.. i.e. it's fairly useless. I'd say for sure this is a bug in outlook's auto config, but how to report it to microsoft?Hello,
Thank you for your report. I am trying to involve someone familiar with this topic to further look at this issue.
Tony Chen
TechNet Community Support
A new Office has arrived, try it now.
A beautiful Start. It begins here. Windows 8 and Windows RT.
Please remember to mark the replies as answers if they help and unmark them if they provide no help. -
Unable to replicate reservation to DHCP failover cluster partner node
Hello.
After reading that whilst DHCP address leases are replicated automatically to DHCP failover cluster partner nodes, and that reservations aren't, I followed steps to right-click the scope from the server which features the specified reservation, and select
'Replicate Scope'. The status window detailing the progression of associated tasks shows that replication of reservations to my other node partner, failed. The error code returned was 20022, which states that the specified IP address is currently taken by
another client.
Why is this occurring? The other node I am trying to replicate to, is within the DHCP failover cluster, and so should be aware that the reservation I am trying to replicate is linked to the same device? Why am I unable to replicate the reservations?
Any help would be appreciated.
Many thanks.Hi,
Based on my research,
DHCP Failover automatically synchronizes leases between failover partners in Windows server 2012 and Windows Server 2012 R2. However, configuration changes on one server in the failover relationship do not automatically get replicated
to the partner, you need to manually replicate by choosing the “Replicate Scope…”
or “Replicate Relationship…” option in DHCP Server.
In addition, for DHCP failover to function correctly, time must be kept synchronized between the two servers in a failover relationship. Please check if the time is synchronized between the two servers.
Besides, you can check the event log to see if any other related information exists.
Best regards,
Susie -
DHCP Failover in Windows 2008 R2 and Windows 2012 R2 Environment
Hi Everyone,
We are trying to implement DHCP failover in our environment. Our IT Infrastructure consists of 4 – windows server 2008 R2 servers and 7 – Windows Server 2012 servers; 1 Main Office with 2 – DC’s and 9 branch/remote offices with one DNS server in every remote
office. All the DNS servers have 2 scopes defined on them for VOICE and Data with different Subnets.
What would be the best method to implement failover in 2008 R2 – Windows Failover Cluster or Split scope? And how to implement DHCP Failover in Windows Server 2012 R2?
Please let me know if you need more information.
Thank you for your help!
-kNHi,
if you can choose between 2008 R2 and 2012 R2 than go with 2012 R2 it is easy to create a DHCP failover there. Actually that is one of the new features of Windows 2012.
With Server 2012 you setup your fist DHCP server with the scopes you want to setup. Than you install the second 2012 server with DHCP role and authorized. If you have done this you going back to your first server, where you already configured your scopes.
Now right click onto the scope you want to setup for failover and select 'Configure Failover'. You can than set it up as kind of split scope (Load balance Mode) or as real fail over setup (Hot Standby). In Load balance Mode you can configure the balance of
IP addresses between the both servers, like primary has 60% IP addresses and secondary has 40%.
With Server 2008 R2 the easiest configuration is split scope. But here it depends how many IP leases you will max have and if you can absorb if one of the server is going down. Lets say you have 50 DHCP leases max, than sure, set it up as split scope. But
if you have 200 DHCP clients, than I would go with failover cluster. At the end it depends on your environment.
Sven
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