ExtremeSwitching (EXOS)

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ARP requests from Extreme Stack

  • 1.  ARP requests from Extreme Stack

    Posted 12-12-2018 20:00
    Hi,

    Is it normal for Extremes to send out ARP requests to subnets not in use?

    19935 2018-12-12 13:49:48.868077000 MS-NLB-PhysServer-04_96:36:1e:ac Broadcast ARP 60 Who has 10.108.251.35? Tell 10.108.0.1

    We do not use 10.108.251.x

    Can I tell switches to only ARP subnets we use?

    Thanks.


  • 2.  RE: ARP requests from Extreme Stack

    Posted 12-12-2018 20:19
    It looks like it's running thru entire 10.108.x.x subnet?

    22 2018-12-12 13:48:46.791238000 MS-NLB-PhysServer-04_96:36:1e:ac Broadcast ARP 60 Who has 10.108.246.95? Tell 10.108.0.1

    10179 2018-12-12 13:48:54.390224000 MS-NLB-PhysServer-04_96:36:1e:ac Broadcast ARP 60 Who has 10.108.247.19? Tell 10.108.0.1

    13566 2018-12-12 13:49:10.443917000 MS-NLB-PhysServer-04_96:36:1e:ac Broadcast ARP 60 Who has 10.108.248.84? Tell 10.108.0.1

    15453 2018-12-12 13:49:21.492526000 MS-NLB-PhysServer-04_96:36:1e:ac Broadcast ARP 60 Who has 10.108.249.33? Tell 10.108.0.1

    17765 2018-12-12 13:49:35.804269000 MS-NLB-PhysServer-04_96:36:1e:ac Broadcast ARP 60 Who has 10.108.250.88? Tell 10.108.0.1

    19935 2018-12-12 13:49:48.868077000 MS-NLB-PhysServer-04_96:36:1e:ac Broadcast ARP 60 Who has 10.108.251.35? Tell 10.108.0.1

    It doesn't seem like it's necessary. Can I stop this? Only ARP subnets we use?

    Thanks


  • 3.  RE: ARP requests from Extreme Stack

    Posted 12-13-2018 07:27
    Maybe you have declared 10.108.0.1/16 instead of 10.108.0.1/24


  • 4.  RE: ARP requests from Extreme Stack

    Posted 12-13-2018 15:10
    It looks like we are using 10.108.0.1/16:

    "configure vlan Desktops ipaddress 10.108.0.1 255.255.0.0
    enable ipforwarding vlan Desktops"

    We use:
    10.108.0.x
    10.108.200.x
    10.108.201.x

    This was setup before my time. If I wanted to eliminate this excessive ARP would this work? Setup 10.108.200.1/24. I'm using about 200 IP addresses in 10.108.x.x. Re-IP the 10.108.0.x devices...

    "configure vlan Desktops ipaddress 10.108.0.1 255.255.254.0
    enable ipforwarding vlan Desktops"

    Thanks


  • 5.  RE: ARP requests from Extreme Stack

    Posted 12-13-2018 15:25
    I think its more efficient to do 10.108.0.1/24 and another vlan 10.108.200.1/23, less work


  • 6.  RE: ARP requests from Extreme Stack

    Posted 12-13-2018 15:34
    forgive my ignorance but...

    Should I create a new VLAN? Desktops1, and do following:

    "configure vlan Desktops ipaddress 10.108.0.1 255.255.255.0
    enable ipforwarding vlan Desktops"
    "configure vlan Desktops1 ipaddress 10.108.200.1 255.255.254.0
    enable ipforwarding vlan Desktops"

    Thanks


  • 7.  RE: ARP requests from Extreme Stack

    Posted 12-13-2018 15:51
    Yeah, but I didnt thought about the devices configuration, you still have to change the gateway in all of them. Sorry.

    Maybe there is another solution.


  • 8.  RE: ARP requests from Extreme Stack

    Posted 12-13-2018 15:52
    youd have to change gateway and mask of course


  • 9.  RE: ARP requests from Extreme Stack

    Posted 12-13-2018 15:56
    Thanks