ESXi 4.1 DHCP and Mac address problem

Similar Questions

• UCS mac address problem

  Hi all

  simple question...

  You may know if it is a bug of mac address learning with version 1.4.1?

  I have go a blade with a mix of palo and other cards, some vnic are pinned to link rising with trunk allowed vlan 501 on both sides. On the blades of the UCS, i've got ESX and ESXi. Service console is labelled VLAN 501 (depending on the configuration of the trunk switch UCS and uplink). Some blade had obtained these interface pinned on the UCS6100 A and another on B (with failover). The fact is that if I ping from outside UCS UCS (ESX) inside no learning of mac is performed on all infrastructure.

  I don't know problem is the UCS because if I erase the mac table UCS, nothing works... and all the works if I start doing a ping of the UCS. I also tried to put the switch uplink static mac (ESX service console) but was not helpful.

  I hope this isn't a 1.4.1 bug...

  TNX and tnx for help

  Dan

  Y at - it you using uplink groups pine or have a network of layer 2 disjoint by chance?

  Questions like these are ususally PIN-related groups / Disjoint L2 using the wrong link DR port for traffic entering.  When the traffic is generated from within the outgoing UCS, the MAC table is updated on the upstream switch which allows traffic to flow, until he gets older.

  If one of them is the case I suggest take you a look at the videos of Brad name video #6:

  http://bradhedlund.com/2010/06/22/Cisco-UCS-networking-best-practices/

  Kind regards

  Robert

• Disable broadcast SSID and MAC address turn on filtering on WAG320N

  When disabling SSID broadcast and enabling MAC address filtering on WAG320N, my other laptop wireless disconnected.  And when you try to connect, it connects again.

  You can not hide from intruders.

  The router always sends the tag. The router is immediately detected.

  The SSID is always transferred not encrypted. He is always sent over the association. It is easy to force a re-Association. If there is a single device without wire connected to the access point it takes about a second to learn the SSID.

  Disable the SSID requires your wireless devices to search actively for the network. This means that your laptop will always try to connect to your SSID, as long as it is not connected to another network. As sending requires much more power then listen passively it drains your battery.

  And, in fact, if you are in an internet café anyone can learn your SSID in time where you go on the wireless at the moment where you associate with the network of internet café.

  In addition, it causes many problems with different wireless, as instability or similar cards.

  MAC filtering is still more useless that the MAC address is always part of any wireless transmission and it's always clear. It is extremely easy to pick up the allowed MAC addresses, and it is extremely easy to change the MAC address of a wireless card.

  New: use the real security and forget this nickname of security features.

  What you try to do is a waste of time. Of your time. It will slow down any intruder.

  See also

  http://homecommunity.Cisco.com/T5/wireless-routers/iPad-Wi-Fi-MAC-address-quot-not-a-MAC-address-quo...
  http://homecommunity.Cisco.com/T5/wireless-routers/is-my-router-effectively-secured/m-p/333945#M1752...

• If I replace my 32-bit Windows 7 with a 64-bit version, can I still keep my old files, settings of the domain network and mac address?

  We bought the RAM for one of our PC, an upgrade from 4 GB to 8 GB. Naturally, we must now upgrade Windows 7 32 bit to 64 bit.

  Our PC is running on a domain within a university network network. We have experienced some problems with one of our PC recently, so I reinstalled Windows 32 bit (no formatting). After which I simply installed the motherboard network drivers, and with one or two small parameters we were back on the domain network. Previous data has been saved to the Windows.old folder, so we kept all our old data and re-installing Windows fixed all the problems we had.

  It is therefore clear that a reinstallation of 32-bit retains all the necessary parameters to return immediately to the domain network. My question is, will an upgrade from 32 bit to 64 bit also keep the settings? Apparently, the essential is that the MAC address must remain the same, which I suppose it would be?

  On Mon, 17 Sep 2012 12:17:09 + 0000, RuanPietersZA wrote:

  Thanks, I appreciate the comments.

  I'm not so worried about the data, let's back up on an external drive anyway. The main concern is the connectivity of the network domain. If we lose this connection after the Windows Installation, you pay the University of departmental again it to the installation program.

  If you go from 32-bit to 64-bit Windows, you must perform a cleanup
  installation. An upgrade is not possible. The new facility
  begin by formatting the drive, and all the disk are lost.

  Ken Blake, Microsoft MVP

• View Composer and Mac addresses

  Hello

  We have recently seen configuration using the pools Linked Clone feature in the display manager.  However, the views that we have created need to have installed software that requires a MAC address to authenticate with the server software.  I see no problem going until it must spread out the updates and have to recompose the pools of the view.  Does anyone know if recompose a view will change the MAC address of the view, or it remains the same?  Any comments will be greatly appreciated.  I tried to look for the answer on advice here, but I can only find the results where requests for improvements are being made to manually configure the MAC addresses.  That would be nice, but it is not necessary for us right now.

  Thank you

  Adam

  I think what they say, it's in a pool persistent scenerio where the machine is assigned to a user, then the MAC will remain the same after a restructuring. Those not assigned to users would keep the same.

  If you have found this device or any other useful post please consider the use of buttons useful/correct to award points

  Twitter: http://twitter.com/mittim12

• Satellite Pro 6100 - Question on WLAN adapt and mac address

  I bought a second hand of Satellite Pro 6100. It has a WiFi adapter. It is where and how do I know the macadress of the adapter?

  Thank you.

  Hello

  If you are sure that this laptop was equipped with the Wlan card, and then the MAC address can be easily discovered 100%.
  You must start the console with the command: * CMD *.

  Then use the command: * ipconfig/all *.
  This would list all the details on the WLan/LAN cards installed in the laptop.
  The physical address means MAC address ;)

  This should help!

• Horizon 7 - Instant Clones and MAC address

  When a 7.0 Horizon instant clone is deleted and re-created then, it will retain its MAC the same way address a related clone will be?

  No, whenever you receive a new Mac.

• ESXi 4.0 Mac addresses

  I suspect that this question has been asked many times before.

  I downloaded a virtual VMware 1.0.7 machine in ESXi 4 and everything works fine. But the defaults of ESXi 4.0 to a MAC address 00: 0C: 29:xx:xx:xx

  But the virtual machine has a different MAC address associated with a license currently running on the server to the virtual computer. Is it possible to change the MAC address? I tried editing the vmx 'ethernet0.generatedAddress' file, but it changes every time that I reboot. If I change the "NIC 1" VM properties it only allows manual 00:50:56:3F:FF:FF MAC addresses

  I suspect that this question has been asked many times before.

  True

  But the virtual machine has a different MAC address associated with a license currently running on the server to the virtual computer. Is it possible to change the MAC address?

  You must change at the level of the comments:

  http://www.tech-FAQ.com/change-MAC-address.shtml

  André

• MAC address auto PowerCLI / duplicate MAC

  We have a duplicate MAC address problem when we move to a server a server vCenter to another. Our method to move the server is to disconnect the server from the vCenter server and then attach it to the other server vCenter. For some reason, the MAC address reviews does not change when it is attached. I would assume vCenter regenerate an unique MAC address based on the unique ID of vCenter but apparently not. Then the old vCenter seems to affect the old MAC address again on the next guest created therefore create duplicate address.

  We try to automate the process of moving to a guest from vCenter for vCenter via PowerCLI. One of the hotfixes in the duplicate MAC addresses is to set it to manual and back to auto ( http://www.vmware.com/support/vsphere4/doc/vsp_esxi41_vc41_rel_notes.html )the problem comes when we want to set the MAC address of a MAC auto return manual. The setting of the MAC address manually is no problem, but we can not seem to figure out how to set the MAC address of return via PowerCLI. Anyone know of a solution?

  Thanks in advance for any help provided.

  Zac

  We run vCenter server 4.1 & ESXi 4.1 U1.

  Take a look at the MAC address of the automatic switch generated with Set-NetworkAdapter.

  Who could do what you're after.

• Laptops stolen - draw MAC addresses

  We had a number of thefts of laptop the past few months and would be able to follow some of these flights, if only we had the MAC addresses! When the new laptops are stolen just after delivery there is no record any of their wireless or the MAC addresses of the NETWORK card that could be used to locate their use on our network and the networks of other Institutions there. It seems that Toshiba does not keep a record of the serial number and MAC address.

  A plea for Toshiba: when will you begin keeping a record of MAC addresses against the serial numbers?

  Although we appreciate that software is available to change the addresses MAC is not valid to save addresses for every laptop on the issue?
  At least we would take a chance to follow the mobile phone in use... ???

  Hello

  It seems that it s not known to you, that this is a user forum and you will find only Toshiba users of cell phones here in the forum. If nobody from Toshiba here.

  Anyway did you check the lower part of one of the units of Toshiba?

  I found on my books different labels below with different numbers.
  There is a label with the serial number, model number and you will of course find the two labels with LAN MAC address and the WLan Mac address.
  I think that it s no problem so that everyone can note these numbers and addresses

  You know Toshiba support home page?
  Check this box:
  http://EU.computers.Toshiba-Europe.com-> support & download
  You will find a database with stolen devices. There, you can save your laptop stolen.

  With regard to the Mac address of follow-up;
  Of course, it is possible discover the Mac address, but how do you want to find the laptop with this Mac address? You want to follow the entire www?
  For me, that doesn't really sound realistic

• IPad wi - fi MAC address not "MAC address" according to the Linksys router

  WRT55AG 2.0:

  Failed to save the MAC address of my new iPad wi - fi MAC filtering table.  Upgrade to the latest firmware, but still does not work.  When I try to record, I get a pop-up that says: "not a MAC Address.

  If I disable the MAC filtering, the iPad can be accessed via the router and the router shows the good MAC iPad in the customer table wireless, but I much perfer to have enabled MAC filtering.

  1. the MAC address filter is not a problem. It's a joke. As I have said before: the MAC addresses are always transferred not encrypted. If someone tries to penetrate your WPA2 protected wireless network, it is necessary to capture a lot of wireless traffic to crack the password. By the time it is cracked (who is supposed to be very difficult and time consuming if the password is good) the hacker knows all the MAC addresses that are accepted for your wireless network.

  2 No. more isn't always better. Are three locks on your door better than two? Ten are better than two? Why have you not 10 locks on your door? The longer the better? It's more, but the impact on you is much more important than the impact on an attacker. WPA2 with a strong password is like putting a stone wall think 100feet for protection. It is very high and very difficult to 'jump '. Filtering of MAC addresses is like putting another small 5 inch thin barrier in front of the wall. The longer the better? Anyone that can fly over the wall will easily get over the fence. The greatest effect of the fence, it's that you will sometimes fall on it because you have forgotten. Compared to WPA2 security with a password strong MAC filter is simply not useful.

  3. the same for the SSID broadcast. Leave it active. The SSID is always transferred unencrypted over the affair with the access point. Any malicious person can easily find your SSID. In addition, it is easy to force a device associated to re-associate. With the right software, it takes a few seconds to learn the SSID. And even with SSID broadcast disabled, him access point always sends a signal of ELT. This means that the existence of your access point is immediately visible. Just the SSID is not transmitted with the tag.

  4. the disabled SSID broadcast technically breaks the wireless standard. Problems with wireless clients are common.

  5. the hidden SSID will be also the batteries in your wireless devices: wireless device always must actively try to connect from the hidden SSID. There is no other way to find out whether there is in the range. If you have ten networks hidden in the list of your wireless device wireless networks will try these ten networks frequently to see if one of these is in the range. In other words, it will try to connect to the hidden SSID and see if anything responds. If you do not connect to any hidden SSID (i.e. all the wireless networks in your list are broadcast) then it is very easy to find out whether a network is within reach: the device has to do is passively listen to the signals from the tags. There is no need to send anything until a known SSID is within reach. Then only the wireless device will try to associate with the SSID.

  So: don't hide your own SSID. And stay away from the other SSID hidden. Do not associate those or don't forget to remove from the list of preferred networks prior to departure. This will allow you to save a lot of battery power...

  To summarize: your neighbor who doesn't know computers would have a problem with broadcast SSID disabled or filtering of MAC addresses. But your neighbour do not know how to use a software to crack a wireless anyway. Anyone who is sophisticated enough to try a good attack on a protected network WPA2 will have no problem with the SSID broadcast or filtering of MAC addresses.

  And if it is an automated attack the SSID and MAC address is detected automatically. The broadcast SSID and MAC address filters are issues for you. They are not problems for any aggressor.

• Different permission on Cisco ISE Mac address format

  Dear all,

  I have problem with my Cisco ISE,

  It's design:

  ISE - Core switch - 3Com - PC user

  My case:

  Authorization is based on Active Directory, and Mac address

  The user with PC connecting to 3Com swtich Deny by ISE but is the Mac of the Format address is different with Cisco.

  Cisco MAC address format: XX

  3Com MAC address format: XXXX-XXXX-XXXX

  3Com switch type is TRICOM 4210 26 - PORT.

  Someone at - it experience with this? and how can change the mac address format in 3Com for user authorized by Cisco ISE.

  Note:

  Active Directory-based authorization is not problem with 3Com Switch.

  From my experience, produces different is mac address of a different size, so this case not only for 3Com Switch.

  Thank you

  Arika Wahyono

  Hello. Authentication using "work around the Mac address" is not a standard feature. The seller do differently. I do not think that this could work, but even if this is possible the solution will be not reliable because it is not standard basic.

• MAC address changed automatically

  Dear all,

  I am facing a problem now, I have an IPs reserved for MAC and the main problem area that:
  I have a PC with card 'GIGABYTE TECHNOLOGY CO."network and MAC address: ' 00: 1a: 4 D: 36:EA:C2", the mac changed to another auto ' 00:00:4 D: 36:EA:C2 "randomly"can be after a restart, then after another reboot back to the main from GIGABYTE.

  Please, show me the cause of this problem and how to solve?

  Thank you
  Omar Mahmoud

  Hello

  The question you have posted is related to the area and would be better suited to the TechNet community or your IT Department. Please visit the below mentioned link to find a community that will provide the support that you have requested.
  http://social.technet.Microsoft.com/forums/en/categories/

• Storage Vmotion to a new data store get UUID and MAC change to hot after reboot

  Hello

  I have a strange thing that happened on my vcenter.

  Just do a vmotion hot storage between two data store.

  I reboot the virtual machine and received no message to validate if I moved or copied.

  When the virtual machine is restarted, I see that changing the UUID and MAC address.
  Make me an error with an application running on it.

  Did anyone see that already?

  We do some testing and solution for this problem is to download the VM's vmx file on the local system and apply these settings:

  If you want to change the setting always or always create , power off the virtual machine and change its configuration (.vmx) file. Remove the line containing uuid.action = "crΘer" or uuid.action = 'keep'.

  The configuration line such as this to keep the UUID and MAC after vmotion: uuid.action = 'keep '.

  Reupload the file on the data store and restart the virtual machine

• How can I print a list of MAC addresses in the Airport utility?

  Hi-

  In our House, security Wi - Fi is obtained by listing the MAC addresses of machines allowed in our airports.  Make a list of these addresses used to be as simple as make a screenshot of the table in the Airport utility.

  Now, with MacOS 10.11.3 and Airport 6.3.6, the table in the network utility > Timed Access Control... > Wireless Clients no longer mentions the MAC addresses.  You can view them one at a time, but you cannot display them all at once.

  Is there a way - possibly with Terminal commands, or perhaps AppleScript - to display the names of the guests from the airport and MAC addresses in a kind of list?

  -Gil

  Apple has closed all utility of its utility... so now, it's the bare minimum and nothing more.

  You can buy tools of third-party network, inet, fing for your iOS devices and find all attached devices.

  Or you can buy a router to another provider and keep the most convenient airport for WAP than this OK functions.

  You can also export the configuration file... search in a text editor and remove MAC addresses... but there is nothing that even comes close to what decent average routers made nowadays.