3750 virtual mac

Hi,
I have a 3750 core switch connecting to fotigate firewall, i have 7 vlans connecting to the core inter vlan routing enabled
firewall interface ip is the gateway i have two firewalls for high availabilty i need to connect switch to 2 firewall interfaces
i created a vlan and assighned 2 ports to that vlan and connected it to FW it is working fine
but when i see traffic in my firewall im only seeing switch mac address ending ccca in the logs for all users
how can i make switch to forward the user mac to firewall?
Regards,
Vinod.N

Duplicate posts. 
Go here:  https://supportforums.cisco.com/thread/2267386

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  • 3750 virtual mac adrress

    Hi,
    I have a 3750 core switch connecting to fotigate firewall, i have 7 vlans connecting to the core inter vlan routing enabled
    firewall interface ip is the gateway i have two firewalls for high availabilty i need to connect switch to 2 firewall interfaces
    i created a vlan and assighned 2 ports to that vlan and connected it to FW it is working fine
    but when i see traffic in my firewall im only seeing switch mac address ending ccca in the logs for all users
    how can i make switch to forward the user mac to firewall?
    Regards,
    Vinod.N

    Duplicate posts. 
    Go here:  https://supportforums.cisco.com/thread/2267386

  • Virtual MAC-Address on Solaris 10 update 9

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    When you say the "original" MAC are you referring to the Hardware Default?
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  • Windows Network Load Balancing - Virtual MAC Address

    Hi All,
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    Hi Henry Stefanus,
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    Building NLB Exchange 2010 RTM CAS / HT Servers (Hyper-V) – Part 1
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    *** This response contains a reference to a third party World Wide Web site. Microsoft is providing this information as a convenience to you. Microsoft does not control these
    sites and has not tested any software or information found on these sites; therefore, Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. There are inherent dangers in the use
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    ACE uses the concept of Virtual Mac Addresses , which are the addresses used for VIP addresses, NAT addresses (dynamic and static), and alias addresses These will all always use a MAC address in the following form 00.0b.fc.fe.1b.
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  • MS NLB w/virtual mac question

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    Hello,
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  • HSRP : routers respond with virtual mac AND physical mac to ARP requests

    Hello.
    I've noticed a very strange behaviour on my two Cisco's 2621 with HSRP configured.
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    - File image : c2600-ik9o3s-mz.122-37.bin
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         - f0/0.60 is configured as inside.
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    - So packets are sent to the wrong router (R2) which can't route any packets because the NAT table is not up to date. I don't even have NAT command to synhronize NAT sessions between routers. But anyway, it should not solve my issue.
    It occurs only on the NAT (outside) interface. On the other virtual interfaces it behaves as expected.
    I don't have any explanations to this behaviour.
    For the moment, I have to keep R2 offline and bring it back online in case of failure.
    I tried several workarounds but I can neither filter ARP packets (no such function) on my router nor on my switch (too restrictive).
    If I forgot any information please ask me.
    Any help would be very much appreciated.

    Hello.
    I've noticed a very strange behaviour on my two Cisco's 2621 with HSRP configured.
    But first, this is a simplified schema of my current network.
    1. Summary
    - IOS version : 12.2(37)
    - File image : c2600-ik9o3s-mz.122-37.bin
    - R1 is the active router.
    - Both have tagged virtual interfaces : f0/0.10 & f0/0.60
    - NAT functionnality is enabled.
         - f0/0.10 is configured as outside.
         - f0/0.60 is configured as inside.
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    R1
    interface FastEthernet0/0.10
    encapsulation dot1Q 10
    ip address 192.168.0.254 255.255.255.0
    ip nat outside
    service-policy output parent_out_internet
    no ip mroute-cache
    standby 10 ip 192.168.0.2
    standby 10 priority 120
    standby 10 preempt
    interface FastEthernet0/0.60
    encapsulation dot1Q 60
    ip address 192.168.1.254 255.255.255.0
    ip nat inside
    no ip mroute-cache
    no cdp enable
    standby 60 ip 192.168.1.1
    standby 60 priority 120
    standby 60 preempt
    ip nat pool ovrld 192.168.0.2 192.168.0.2 prefix-length 24
    ip nat inside source list internet pool ovrld overload
    R2
    interface FastEthernet0/0.10
    encapsulation dot1Q 10
    ip address 192.168.0.253 255.255.255.0
    ip nat outside
    service-policy output parent_out_internet
    no ip mroute-cache
    standby 10 ip 192.168.0.2
    standby 10 preempt
    interface FastEthernet0/0.60
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    ip address 192.168.1.253 255.255.255.0
    ip nat inside
    no ip mroute-cache
    no cdp enable
    standby 60 ip 192.168.1.1
    standby 60 preempt
    ip nat pool ovrld 192.168.0.2 192.168.0.2 prefix-length 24
    ip nat inside source list internet pool ovrld overload
    3. Events.
    - When HSRP first runs or when there is a topology change, the active router sends correct ARP gratuitous reply packets (with the virtual MAC address)
    - ARP table is filled in on the Internet router.
    - When the ARP entry in the table expires it asks for the virtual IP mac address (192.168.0.2).
    - R1 responds with the virtual MAC address ---- BUT ---- R2 also responds with its physical mac address !
    - So packets are sent to the wrong router (R2) which can't route any packets because the NAT table is not up to date. I don't even have NAT command to synhronize NAT sessions between routers. But anyway, it should not solve my issue.
    It occurs only on the NAT (outside) interface. On the other virtual interfaces it behaves as expected.
    I don't have any explanations to this behaviour.
    For the moment, I have to keep R2 offline and bring it back online in case of failure.
    I tried several workarounds but I can neither filter ARP packets (no such function) on my router nor on my switch (too restrictive).
    If I forgot any information please ask me.
    Any help would be very much appreciated.

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    Many thanks,
    Michael Blake.

    Hello Michael,
    you might want to have a look at the documents below, describing two techniques developed for the problem of NAT in an HSRP environement:
    NAT Stateful Failover of Network Address Translation.
    http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t13/ftsnat.htm
    NAT Static Mapping Support with HSRP for High Availability
    http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t4/ftnthsrp.htm
    Regards,
    GP

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    C [mshtml.dll+0x2782a9]
    C [mshtml.dll+0x279895]
    C [mshtml.dll+0x79d01]
    C [mshtml.dll+0x9a6b5]
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    j sun.plugin.viewer.frame.IExplorerEmbeddedFrame.destroy()V+74
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