Background: HMC software version 2.11.1 connected to a z10.
The HMC is connected to two networks. The first is a small private
network with just the laptops in the z10 and the HMC. No other HMCs or
other CPUs. The second network is a local network with several items on
it, including other HMCs. This network is behind a VPN firewall and is
used to access the web services on the HMC.
Both interfaces have hard-coded IP addresses.
Today we noticed something strange. We had a DHCP address assigned to a
box we did not know about. Except for 3 workstations on the network, all
other boxes have hard-coded IP addresses. In the DHCP assigned addresses
table, the box had provided a name of BMC_DHCP.
After a bunch of testing, we isolated the assigned address to the HMC,
but the address does not show up in any of the HMC panels that show IP
addresses.
Items:
1) When we ping the HMC using the hard-coded address, the response is
under 3.0ms.
2) When we ping the DHCP assigned address, the response is 10x longer,
in the 30.0ms range.
3) The arp tables on another PC show both addresses having the same nic
address.
4) The HMC can ping it's own hard-coded address, but it can not ping the
DHCP assigned address.
5) We have other CPUs and other HMCs. None of the others are doing the
same thing. (z900 though z10).
6) This HMC has the latest software version of all the HMCs.
7) nMap (port mapping tool) says that there are no ports open at this
DHCP assigned address.
Thoughts on what is happening?
Anybody else seeing the same thing?
--
Tony Thigpen
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