W2012R2 DHCP Failover - Bad Address

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hi,

the scenario following:

  • 2 win2012 r2 servers configured dhcp. each @ different city.
  • all of scopes configured in failover (load balancing)
  • all of pcs have own reservation (customer policy)
  • all of pc's mac address registered @ filter (allow)
  • every day occur approx. 10  reservations "bad_address" @ name, , mac value other original mac address (different reservations affected).
  • the update kb2919355 installed @ both servers (https://blogs.technet.microsoft.com/teamdhcp/2014/02/24/dhcp-failover-fixes-in-kb-2919393-for-windows-server-2012-and-kb-2919355-for-windows-server-2012-r2/).

the questions are:

is above behavior normal behavior @ dhcp failover?

if no,

what else review/configure resolve above bad address problem?

i'll appreciate help.

thanks in advance!

hi sccmadmin09,

1. may ping ip address being marked bad address, to check if ip addresses in use;

2. bad addresses random or specific ip addresses. bad address disappear after period of time;

3. check if have multihomed dhcp clients connect same subnet, , dhcp server multihomed;

4. check if there error log dhcp server;

5. if above troubleshooting thoughts couldn't find out issue, may use network monitor on 1 of "bad address client" and dhcp server. use ipconfig/release&renew on client, ,  watch behavior of dhcp client , dhcp server:

network monitor download:

https://www.microsoft.com/en-us/download/details.aspx?id=4865

best regards,

anne

please remember mark replies answers if , unmark them if provide no help. if have feedback technet support, contact tnmff@microsoft.com.



Windows Server  >  IPAM, DHCP, DNS



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