Ip address issue

[John Wick]

Hi,

We found that ip free that already been use by other vm will show duplicate in windows server. Is this some kind of bug?

Thanks.

 

[dcsapak]

We found that ip free that already been use by other vm will show duplicate in windows server. Is this some kind of bug?

do you mean windows vms get ips which are already used elsewhere? if yes, i would suggest to look at your dhcp server, as this is not something proxmox does

 

[John Wick]

We don't have DHCP server. Our server run all with static ip.

We have setup other VM's. All our VM's using static IP. We do not put DHCP. Let say i put 213.32.15.18 on VM1. Then a few hours i delete VM1. I creating new VM can VM2. So i put 213.32.15.18 to VM2. When i check from command prompt using ipconfig /all, behind ip 213.xxx.xxx.xxx got this (Duplicate). But i ping the ip it's not available. I test on a few VM's setup using windows 2012R2. Same thing.

 

[John Wick]

Refer attached picture.

 

[dcsapak]

works fine here,
this looks like an issue with your network.
something on your network answers to (i guess) an arp request for this ip... so windows thinks it is already in use

 

[John Wick]

It happen on windows server only. On linux no issue at all.

 

[dcsapak]

do you have an active directory server ? maybe there are some settings left over?

 

[John Wick]

We don't active directory or ldap on our cloud hosting.

 

[John Wick]

Confirm same issue with linux. Just try on a few VM's.

 

[John Wick]

The problem is LACP on a cisco switch. I do not know what network engineer did but it's solve the problem.

 

[rajivbaxi]

Could you find out what the LACP settings needed to be changed on the Cisco switch? I believe I have a similar issue.