VRRP MAC address

Please tell me what MAC address VRRP uses for the virtual IP. Do all cisco IOS use only one unique MAC for one VRRP group? What about the virtual MAC address in case master failure, does new master(previously backup) still use same virtual MAC after previous master fails?
Also I want to know if it is possible that IOS answer ARP request for the virtual IP with master's real physical MAC address in some cases.
For example, R1 e0 is configed with VRRP, its physical MAC address is MAC-PHY, virtual MAC for that virtual ip is MAC-VIR. When ping the virtual IP, master R1 answer ARP with MAC-PHY, or other MAC than MAC-VIR. Is that possible in some cases?
I used 2610 and 3610 IOS 12.3 test it. And I found it always use same virtual MAC. But I am not sure different platform/IOS has different beheavior.
Thanks in advance.

Please tell me what MAC address VRRP uses for the virtual IP. Do all cisco IOS use only one unique MAC for one VRRP group?
>>>The virtual router MAC address associated with a virtual router is an IEEE 802 MAC Address in the following format:
00-00-5E-00-01-{VRID} (in hex in internet standard bit-order)
The first three octets are derived from the IANA's OUI. The next two octets (00-01) indicate the address block assigned to the VRRP protocol. {VRID} is the VRRP Virtual Router Identifier. This
mapping provides for up to 255 VRRP routers on a network.
What about the virtual MAC address in case master failure, does new master(previously backup) still use same virtual MAC after previous master fails?
>>> Yes, per above that mac-address is associated to Virtual Router.
Also I want to know if it is possible that IOS answer ARP request for the virtual IP with master's real physical MAC address in some cases.
For example, R1 e0 is configed with VRRP, its physical MAC address is MAC-PHY, virtual MAC for that virtual ip is MAC-VIR. When ping the virtual IP, master R1 answer ARP with MAC-PHY, or other MAC than MAC-VIR. Is that possible in some cases?
>>> I don;t think so since there is no interface command to tell router to use BIA for VRRP much like the HSRP.
I used 2610 and 3610 IOS 12.3 test it. And I found it always use same virtual MAC. But I am not sure different platform/IOS has different beheavior.
>>> It's not platform dependent it's how it operate per RFC 2338.
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Similar Messages

ARP table not populating mac address for previously reachable IP address

Router has been online and working fine with one BGP neighbor for almost 2 years and no downtime. 2 weeks ago, added a 2nd BGP peer. Everything worked fine for 2 weeks, then all of a sudden yesterday the 2nd BGP peer is disconnected and does not come back. ISP checks and sees everything looks fine on their end. We cannot even ping each other now.
Upon investigation, the ARP table is not even populating the MAC address for the BGP peer IP anymore (same local subnet). Stays "incomplete" in the table no matter what we do, including clearing arp table, changing IP address, etc.
Plug a laptop directly into the 2nd BGP peer FE port and replicate the IP addressing. Laptop cannot ping Router, but Router CAN ping laptop. Check ARP table, but STILL no mac address assigned and now not even the ARP table showing "incomplete".
Thinking it could be the FE interface, switch to the 2nd FE interface and perform same laptop test, this time with arbitrary IP addressing. Now cannot ping each other, no MAC in ARP table.
End up rebooting the router and lo-and-behold, everything is working normally again. 2nd BGP peer peers up instantly.
I should also mention that the 1st BGP peer worked flawlessly throughout, taking all the Internet load and having no issues throughout.
Also, the FE ports for the 2nd BGP peer are on an HWIC FE card plugged into the router. The 1st BGP peer is plugged into the built-in GE interface. 2901 running: c2900-universalk9-mz.SPA.151-4.M4.bin
Lastly, no router resource issues, no error messages, no logs. Just the BGP peer disconnecting.
I have never, in 20 years working with Cisco routers seen something like this before. This is the most fundamental aspect of IP and Ethernet that was not working.
Has anyone ever seen this behavior before??
Here is the router config (IP's changed):
version 15.1
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
service password-encryption
service internal
service sequence-numbers
boot-start-marker
boot-end-marker
logging buffered 150000
aaa new-model
aaa authentication login LAUTHEN local
aaa authentication login TAUTHEN local group tacacs+ enable
aaa authorization console
aaa authorization exec LAUTHOR local if-authenticated
aaa authorization exec TAUTHOR local group tacacs+ if-authenticated
aaa session-id common
clock timezone PST -8 0
clock summer-time PDT recurring
no ipv6 cef
no ip source-route
ip cef
no ip domain lookup
multilink bundle-name authenticated
username ubiadmin privilege 15 secret 4 .JbeuWXuZvchrG0OL.5BftFtqrrEyxcnVHn5rIuCnTk
username umitsnoc01 privilege 15 secret 4 cUmoRUjey9O1x.wk9S.kleX.iAAhCwihupr6Z98p6OA
redundancy
ip ssh version 2
track 1 interface GigabitEthernet0/0 line-protocol
class-map match-any AutoQoS-VoIP-RTP-Trust
match access-group name SIP-Media-INBOUND
class-map match-any AutoQoS-VoIP-Control-Trust
match ip dscp cs3
match ip dscp af31
class-map match-any Customer-Voice
match access-group name Customer-VPNs
class-map match-any media
match access-group name SIP-Media
class-map match-any signaling
match access-group name SIP-Signaling
policy-map AutoQoS-Policy-Trust
class AutoQoS-VoIP-RTP-Trust
priority percent 70
class AutoQoS-VoIP-Control-Trust
bandwidth percent 5
class class-default
fair-queue
policy-map queue
class signaling
bandwidth percent 5
class media
priority percent 50
class Customer-Voice
priority percent 40
class class-default
fair-queue
policy-map shape
class class-default
shape average 10000000
service-policy queue
interface Embedded-Service-Engine0/0
no ip address
shutdown
interface GigabitEthernet0/0
description BGP Peer 1
ip address 2.2.2.2 255.255.255.252
no ip redirects
ip flow ingress
ip flow egress
duplex auto
speed auto
service-policy output shape
interface GigabitEthernet0/1
description LAN
ip address 1.2.3.4 255.255.255.0
no ip redirects
ip flow ingress
ip flow egress
standby 255 ip 1.2.3.1
standby 255 priority 105
standby 255 preempt
standby 255 mac-address 1a2b.3c4d.5e6f
standby 255 track 1 decrement 10
duplex auto
speed auto
service-policy output AutoQoS-Policy-Trust
interface FastEthernet0/0/0
description BGP Peer 2
ip address 1.1.1.1 255.255.255.252
ip flow ingress
ip flow egress
duplex full
speed 100
service-policy output shape
interface FastEthernet0/0/1
no ip address
shutdown
duplex auto
speed auto
router bgp 7777
bgp router-id 2.2.2.2
bgp log-neighbor-changes
network 1.2.3.0 mask 255.255.255.0
neighbor 1.1.1.2 remote-as 5555
neighbor 1.1.1.2 update-source FastEthernet0/0/0
neighbor 1.1.1.2 prefix-list L3-DEFGW in
neighbor 1.1.1.2 route-map L3-LPREF-IN in
neighbor 2.2.2.1 remote-as 6666
neighbor 2.2.2.1 ebgp-multihop 2
neighbor 2.2.2.1 update-source GigabitEthernet0/0
neighbor 2.2.2.1 send-community
neighbor 2.2.2.1 prefix-list COLO-DEFGW in
neighbor 2.2.2.1 route-map COLO-LPREF-IN in
neighbor 2.2.2.1 route-map COLO-OUT out
ip forward-protocol nd
ip bgp-community new-format
ip as-path access-list 5 permit _5555_
ip as-path access-list 5 deny .*
ip as-path access-list 10 permit ^6666$
no ip http server
no ip http secure-server
ip flow-top-talkers
top 50
sort-by bytes
ip route 0.0.0.0 0.0.0.0 1.1.1.2 254 name L3
ip route 0.0.0.0 0.0.0.0 2.2.2.1 255 name COLO1
ip route 10.0.0.0 255.0.0.0 10.10.10.10 name FW_OUTSIDE
ip tacacs source-interface GigabitEthernet0/1
ip access-list standard SNMP_SOURCES
permit 12.12.12.0 0.0.0.255
deny any log
ip prefix-list L3-DEFGW seq 5 permit 0.0.0.0/0
ip prefix-list COLO-DEFGW seq 5 permit 0.0.0.0/0
ip prefix-list COLO-LPREF-OUT seq 5 permit 1.2.3.0/24
route-map COLO-LPREF-IN permit 5
match as-path 5
set local-preference 250
route-map COLO-LPREF-IN permit 10
set local-preference 150
route-map COLO-LPREF-IN permit 20
route-map COLO-OUT permit 10
match ip address prefix-list COLO-LPREF-OUT
set as-path prepend 7777 7777 7777
set community 29795:1004
route-map COLO-OUT permit 20
route-map L3-LPREF-IN permit 10
match as-path 10
set local-preference 200
route-map L3-LPREF-IN permit 20
set local-preference 150
snmp-server enable traps snmp authentication linkdown linkup coldstart warmstart
snmp-server enable traps vrrp
snmp-server enable traps flowmon
snmp-server enable traps transceiver all
snmp-server enable traps ds1
snmp-server enable traps call-home message-send-fail server-fail
snmp-server enable traps tty
snmp-server enable traps license
snmp-server enable traps envmon
snmp-server enable traps ethernet cfm cc mep-up mep-down cross-connect loop config
snmp-server enable traps ethernet cfm crosscheck mep-missing mep-unknown service-up
snmp-server enable traps flash insertion removal
snmp-server enable traps mac-notification
snmp-server enable traps aaa_server
snmp-server enable traps cef resource-failure peer-state-change peer-fib-state-change inconsistency
snmp-server enable traps memory bufferpeak
snmp-server enable traps config-copy
snmp-server enable traps config
snmp-server enable traps config-ctid
snmp-server enable traps event-manager
snmp-server enable traps hsrp
snmp-server enable traps cpu threshold
snmp-server enable traps rsvp
snmp-server enable traps syslog
snmp-server enable traps vtp
snmp-server enable traps ipsla

When you were checking the ARP table was there an entry for Fast0/0/0?
HTH
Rick

Router MAC Addresses

Hello all.
Is it correct that routers don't have a base Ethernet MAC address (but switches have) and the only MACs that routers have are the BIAs in the interfaces?

Hello Collin.
Depends. Are you talking for something like spanning tree or for something like HSRP/VRRP? Generally speaking in STP, a switch has a base MAC (chassis's use the Sup MAC, stackables typically use use lowest interface -1).
Is the base MAC used for STP different from the one used in HSRP? I'm actually referring to the base MAC shown in the output of sh version on a switch. I just noticed that routers don't have a base MAC in the output of sh version.

How to make mac address gmail contacts overwrite the ones on my HTC Android phone - I don't want to sync - that makes the phone scramble and overwrite my computer. I want to remove or correctly overwrite the phone information as I have done with iPad.

Please help - I am beginning to hate google, my android and gmail. I have just wasted about 5 hours in a futile attempt to try and get my current Mac contacts list on my computer updated to my phone. I'm not that computer literate but I have looked up about google phone accounts, vCards, backing up contact lists, what SD on phones are, and God know what else. I have searched the internet and tried all sorts of things and I still have a mac with a now correct contact list (after the iPad contacts scrambled it and I spent ages manually correcting them all) and a phone with an outdated contact list. If you try and sync them the phone wants to overwrite the computer one just like the iPad did (would it be so **** hard to give you a choice on the phone as to which overwrites which!). After all the advice on the internet failed, I got the bright idea to completely delete all the ones on the phone and if it was empty of contacts the computer one could be exported to it. Not as simple as it sounds. First I backed up (I think) my computer contacts list. Numerous futile attempts to go through the phone options to globally delete all contacts did not work - they gave a warning message and you got to choose whether to continue or not, I did, and it looked like it might be working as it changed to zero data on the phone, but then they all popped back up again from God knows where from, but without their little added bits like pictures of the people. So, I tried un- syncing the darn phone from google and then deleting them globally. That didn't work either. I tried deleting them all again and again and google would crash and not let me do it. It is absolutely ridiculous that this is so damned difficult to do (especially if you are not computer savvy) and that you cannot choose which device overwrites which when syncing. I gave up and ticked sync with Google again (not that it appears to do anything to the phone contact list at all). So after 5 hours I am back to where I started from, with a phone showing all the same incorrect contacts (but the pictures are back), which wants to overwrite the computer if I try any sort of sync, and no way to fix them except go into each one manually and try and do it - and how long would that take (and I've already wasted hours and hours fixing scrambled contact lists!). I think I will do a print out of the computer contact list and just carry it around with me like an address book - so much bloody simpler. So now I have a headache, am fighting an overwhelming urge to hurl the phone at the wall, hoping for a heat wave to evaporate icloud things and am wishing I had bought an iPhone instead of the stupid HTC Android. Can any one offer me any suggestions on how to get rid of the contacts on my phone and replace them with the ones in my mac address list - hopefully after that they can sync to their hearts content and not stuff everything up again (which was why I unsynced google a while back - because the phone's list kept making stuff ups and scrambling and duplicating my computer contacts list). Am I the only one on the planet having this problem or is there someone else out there who has had it and solved it.

Without "pretending" to be yourself on the other phone (change settings) there's nothing else you can do.
iOS devices are meant to be single user and can't view iCloud.com the same way a Mac or PC can do.
You need to find a desktop or laptop machine (Mac or PC) to log in at iCloud.

I want to reserve a static IP address on my Airport extreme. What is the difference between reserving by MAC Address and DHCP Client ID?

I want to understand the differences in the way you can reserve a static address for a device on the network. I had previously set the device itself to an address and then reserved it with DHCP Client ID, which I thought was just the devices static addresss. I'm not sure if this was in fact correct or just happend to work. I know what a MAC address is, but I'm not really sure what the DHCP Client ID is. So it would be great if someone could clarify it, and the difference between reserving address by MAC Address or DHCP Client ID.

A MAC address is a unique identification consisting of letters and numbers in a form that looks like this:
xx:xx:xx:xx:xx:xx
Every network device has a MAC address, which can be found on a label on the bottom or back of the device. Apple calls this the Ethernet ID.
A DHCP Client ID is an optional name that you can assign to a device. For example, on your Mac....
Open System Preferences (gear icon on the dock)
Open Network
Click on Ethernet
Click Advanced at the lower right
You may be able to edit the DHCP Client ID here....for example.....you could enter MJ500's MacBook in the space provided. That would be the Client ID of your Mac.

I have two .mac addresses; how does this work in iCloud?

This is not about consolidating Apple ID's... I think.
When I got my first .mac address, I thought I picked a good one at the time. Later on, due to the peculiar spelling, I opted for an additonal (paid) address which I use every day. Now the first one (which is an Apple ID) contains my calendars, contacts, etc. I never use the email portion of it, again because of challenging spelling. The second .mac address (also an Apple ID) is an email only account. This is the email account I use daily.
When I make the transition to iCloud, I intend to keep my original AppleID (from the pre-.mac days) as my iTunes store ID.
My question is, what happens with my two other accounts?
.mac #1 with the contacts and such would move to iCloud and sync everything there as it currently does with MobileMe. Since .mac #2 is an email only account, would I even need to bother moving it to iCloud (if that's even possible), or would I just keep using that as email only using the current mail settings on my iThingys and Mac? Does anyone know if .mac #2 will live on after MobileMe vanishes, or will I loose my daily and coveted .mac email at that time?
I'm sure Apple has a good reason for not allowing us to just consolidate everything in one place, but I know there are many out there with a similar situation to mine.
I've spent a good deal of time tonight searching the various threads and can't seem to find an answer to the two .mac email dilemma. My appologies if it's already been discussed.
To sum up, I have one Apple ID that I use for iTunes and intend to keep as such. I have two .mac addresses which are also Apple ID's; one that syncs with MobileMe and one that is email only. I would like to use iCloud to sync what is currently on MobileMe, AND continue to use the simpler email address that I've been using for years.
Am I screwed??
Thanks in advance for your help, and Happy Holidays to all!!

Migrate the account which contains your calendars, contacts etc. first, at http://me.com/move and set it up on your Mac and devices.
http://www.apple.com/icloud/setup/mac.html
Now migrate the email-only account in the same way. On a Mac you can add it in System Preferences>Mail, Contacts & Calendars - it won't sync anything but will be added to the accounts in Mail where you can then use the email in the normal way.
I don't know what the equivalent process on an iOS device is; very likely you need to add it as an account in the Mail app.

How to find a workstation object by ip or mac address?

Hi gang.
I'm trying to search for a workstation object by mac address or by IP
address. So far, I'm not able to find the correct attributes to do so.
Can anybody point me in the right direction to find a workstation by either
IP or mac?
thanks!
John

[email protected] wrote:
>
> Hi gang.
>
> I'm trying to search for a workstation object by mac address or by IP
> address. So far, I'm not able to find the correct attributes to do so.
>
> Can anybody point me in the right direction to find a workstation by either
> IP or mac?
In ConsoleOne find, advanced, look for ZEN:INV IP Address attribute
-sk

How do I add my phone's Wi-Fi Mac address to my home server so that I can use my home Wi-Fi with my phone?

Hello. I am using an Android cell phone and, though the phone sees my home server name and accepts my password, it won't connect. I understand that I may have to add my phone's Wi-Fi Mac address to my home server in order for it to allow my phone access, but I have no idea how I might do that. Could someone help me with this? Thank you.

Tdalso wrote:
How do I add a phone number so I can use either my US or Canadian number (depending on where I am) with iMessage and Facetime on both my iPhones?
You need to log out of iMessage and Facetime, make sure your number is correct in Settings/General/About, then log back in again to send a new activation request.

I need to change the MAC Address for Airport on MacBook

I have a specific need to change my son's Airport MAC address as his school requires the use of USB network cards that aren't compatible with MACs. These cards are needed because the school's router uses MAC address filtering.
Before we upgraded his Mac to Snow Leopard, we were able to change the MAC address to the MAC address of the useless dongal the school supplied. We basically created an AppleScript program that ran the "sudo ifconfig en1 ether xx:xx:xx:xx:xx:xx" and all was good.
This command no longer works for changing the MAC address. We tried it as root user as well and by typing it into the terminal window as root. After running the command, we can run "ifconfig en1" and it does display the new mac address but when we turn the airport on and try to connect, it just hangs and won't connect.
Our other non-Snow Leopard still works fine after running the commands so I'm guessing Apple disabled this functionality. It's hardly a security issue by being able to change your mac addres.
Is there a new way to accomplish this? I've searched everywhere.
Thanks!

Would an easier solution be to provide the school's IT admin with your mac address and have it added? If they can add a block of mac addresses for the usb dongles, they can add more for machines that cannot use the dongle.
Also: "It's hardly a security issue by being able to change your mac address."
While it may not be a security issue for your machine, it is a security for the school network who is using mac address filtering as hopefully only one part of their wireless security.
That being said, have you read this?
http://osxdaily.com/2008/01/17/how-to-spoof-your-mac-address-in-mac-os-x/

How to connect apple TV when im in hotel without giving my mac address

i got my apple tv with me cause i live in hotel but the only way to connected to internet if I give them my mac address therefore if i give my mac address to customer service wont they be able to access all my info and my mobile when connected or pictures and video

Hotel networks require authentication via webpage, there is no browser on Apple TV so it won't be possible to connect this way. The only way will be to give the mac address, it would be for connecting to the Apple TV. No info will be accessed.

Do I need to add Base Station MAC address to list?

Hi, If I choose to use MAC address filtering on my Airport Extreme Time Capsule, do I need to add the wireless MAC address of the Base Station to the list of allowed MAC addresses??? I'd feel real bad if I set up a list, didn't include the base station's MAC address and then could never get in to the network again because I, in effect, locked myself out??? I doubt that address needs to be included but I would like some feedback on that.
Second, does the one MAC address filter list apply to the Guest Network as well if I should choose to turn it on??? If that was the case, I would just turn off MAC address filtering why guests were present.
thanks.. bob

If I choose to use MAC address filtering on my Airport Extreme Time Capsule, do I need to add the wireless MAC address of the Base Station to the list of allowed MAC addresses???
No. Timed Access would be for wireless devices....computers, mobile devices, printer, etc., that are connecting to the Time Capsule. The Time Capsule does not connect to itself in this regard.
I'd feel real bad if I set up a list, didn't include the base station's MAC address and then could never get in to the network again because I, in effect, locked myself out???
Sometimes, users lock themselves out by mistake by entering incorrect times for devices to connect, and they often forget that they can connect to the base station using an Ethernet connection and get back in that way.....since Timed Access only applies to devices that connect using wireless.
does the one MAC address filter list apply to the Guest Network as well if I should choose to turn it on???
Yes

Spanning Tree and Admin mac address issues srw2048

Ok, I have a somewhat complex problem and hopefully someone may shed some light or have an idea as to whats wrong.
First the scenario:
I have two Cisco Cat 6509's etherchanneled to each other via two fiber cables. One of these is the STP/RSTP root. I have two SRW2048's.. one trunked to each of these 6509 switches. There is also a trunk between the SRW2048's. All this is to create a redundant topology so that if one of the switches fail's the others can still forward packets to each other. Of course the scenario described is in fact a loop that should be handled by STP/RSTP. I have RSTP enabled on all the switches in the scenario (PV RSTP on the cisco switches as they only do Cisco's brand of per vlan spanning tree). There are 3 vlan's configured on each of the srw2048's (2,55,96). There are corresponding vlan's also on the 6509's. I have put the srw2048's management interface into vlan 2.
The problem:
I need to forward packets between the srw2048's primarily and only use the 6509 that is not the root when a failure happens. I have configured the non-root 6509's spanning tree cost on the etherchannel to be higher then the alternate path through the srw's to the root. I can hook everything up and view the spanning tree and see that the srw2048's interface that goes to the non-root 6509 is blocked, and all other interfaces on the other switches are forwarding. I can in fact ping and get to the admin interface on all the switches. Then for some strange reason the admin interface of the srw2048 plugged into the non-root 6509 stops responding. If I disable either the interface its plugged into on the 6509 or the other srw2048 everything starts working again. Sometimes it responds after many failures for no apparent reason. I looked into the mac-address table on the 6509's and they are conflicting, pointing to each other for the mac-address of the broken srw2048. When I clear the mac-table the admin port comes back for about 5 seconds then again goes dark. When reviewing mac-table on the 6509's they are back to pointing to each other. The odd thing (although I haven't confirmed this completely) is that hosts placed into vlan 2 on that same srw2048 seem to work fine. If there was an STP loop or something misconfigured, I would expect it to effect any host in vlan 2 or the other vlan's for that matter on the srw2048 that stops responding. Alas, I am stuck because I need to manage this switch remotely. My only thought is that for some reason even when the STP status is blocked the broken srw2048 is still sending out arp's of its admin interface and bypassing the STP protocol. I have no way to confirm this, but maybe someone has an idea as to what I'm doing wrong, or otherwise offer a solution. For now, I simply removed vlan 2 from the 6509 that the broken srw2048 is plugged into and everything seems fine.
My apologies for such a long post, but this is somewhat complicated. Thanks in advance for any info.
-Geoff
Message Edited by gmyers on 08-19-2008 10:35 PM

To follow up, I had a ticket open with Linksys about this for about 3 months with no resolution. I submitted packet captures, stp outputs, etc and no luck. I gave up and basically had to revert to a manual failover for redundancy. It's no perfect or fast, but it works every time.
Unless linksys issues a firmware upgrade with this as a fix, I doubt we will be able to ever resolve this on our own.

ICloud to Mac Address Book - Two Questions

Okay, I have learned/accepted that iCloud is not the sync'ing deal that MobileMe was (missed that in the fine print as I have been a loyal .mac user from its inception and like the MM syncing). I understand that everything is updated in the cloud and pushed to various devices (for me, iPhone 4S, new iPad and 2009 MBP). So, how is it possible for my iCloud address book to have more contacts than my MBP address book? Wouldn't all of the ones in iCloud be pushed to the MBP? The only thing I can think is that before I understood the concept that there are two address books resident on the MBP, I starting deleting what I thought were duplicates since I wasn't able to merge them due to two different sources. I could not find a way at that time to tell me which line was from what source. Then, once I get the two address books matching - mostly to ensure that I am not missing anything in the iCloud one - what purpose does the Mac based address book serve? I just had a nightmare of dragging various cards from my iCloud address page on the right into the iCloud group on the left and only to realize after doing at least 20 cards that after the first one, the left page registers back up putting the Mac based group across from the iCloud contact list so I dropped many of them into the Mac group instead of the iCloud group. The iCal doesn't maintain a Mac version and an iCloud version, why does the address book? BTW, all software on all devices is up to date as of this posting.

Please pardon what may be a silly question. This is my first ever post...
I was thinking about deleting "On My Mac" address book per your above instructions, and sticking with the one iCloud contacts. The problem I am afraid of running into is this: In iTunes, when I sync contacts, the groups that show available for syncing all come from "On My Mac". If I delete from the Mac, will that make my "Contacts" icon on my iPad 'dead'? Thereby, forcing me to log onto iCloud to view my Contacts, instead of a handy shortcut???
Or will I simply get to forgo the iTunes syncing... and the "contacts" icon on my iPad will reflect what was synced thru iCloud?
If the latter is true, does that simply mean I will need to recreate my "groups" in iCloud?
Thanks in advance, I certainly need some guidance.

Multiple IP adress on one mac address?

Hi!!
I have a WLC 2504 and AP 1602. Is it possible to give the client multiple ip addresses with one mac address. If yes, how it's made on WLC or AP?

In certain cases there is a need to have multiple IP addresses responding beyond a single client wireless association. For example, some video cameras will have an internal communication module that tied to wireless interface via ethernet. Some PoS devices may have similar requirement.
In WLC there is an option WLAN->WirelessID->Advanced->Passive Client.
Now I am not sure if this will work with multiple IP addresses tied to the same MAC or not.

How can I tell Apple to store my MAC-address of my Wifi Router in there location DB?

Hello
Recently I bought a new Wifi Router and when I use the Maps App it tells that my ipad is located in China (Shangai)
When I also want to use the automatic timezone feature in the preferences app it indicates that my ipad is in China (Shangai)
I have already searched for a number of discussions (in and out the Apple Support) and their I found that the problem is in a location DB managed by Apple (crowd-sourced database). It seems that my Wifi Router is registered with a wrong location. :-(
my questions :
.- is the somebody that can give me a procedure (certified by Apple) how I can update this location DB?
.- How can I store my Wifi Router MAC address with the correct location in this DB?
Already thanks in advance
Kindly regards
P@nt@ni

try this
http://www.skyhookwireless.com/howitworks/submit_ap.php

VRRP MAC address

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