DHCP Relay Bug

[Sysad]

Is anyone else experiencing issues with a DHCP relay bug with Stable Firmware MS14.32? We recently updated our MS350 stack from MS12.17 to MS14.32 and we are now having DHCP issues with our windows workstations. *Note: we did not have this issue with MS12.17. Everything works fine if the windows client is assigned a static ip, but if they are not assigned a static ip, then they have issues renewing there IP address. In some cases the windows device may receive an Apipa 169 address. Is this issue resolved in MS14.33 or MS14.33.1?

[Aaron_Wilson]

There is this known bug, which I'm not 100% sure if you are hitting:

"In rare instances, DAI inspection may fail to snoop DHCP transactions on stacks leading to those clients being in a blocked state"

It appears resolved in 15.4.

Otherwise the published DHCP bugs are related to the MS390

[Sysad]

Interesting. We have dai disabled in our environment. Do you think that this could still be causing some kind of quirky issue in the background with the dhcp requests.

[Aaron_Wilson]

Probably not related, but seemed to be the only public known bug for DHCP.

Is your DHCP server local or across the WAN?

[Sysad]

Local dhcp server.

[PhilipDAth]

I had an issue a bit like this on an MS350 stack where the switch was doing the routing.  Just a single VLAN was affected.  It got resolved in a firmware update.  I'm not sure which one now, but note the current stable version is 14.33.1, and not 14.32.  14.32 has been already been removed.

[Sysad]

Phillip,

which version of firmware did you upgrade to?

Also, do you have DAI disabled?

[PhilipDAth]

Upgraded to 14.33, and not using DAI.

[Sysad]

Thank you Philip. I will try to get the firmware upgraded. Did you have any other issues with MS14.33 on the MS350?

[PhilipDAth]

No issues with 14.33.

And this only affected a single MS350 stack.  All other MS350 stacks were fine.

[Sysad]

Thank you Philip. Do you have multiple co-located offices with MS350 stacks setup at each location?

[PhilipDAth]

Just a single MS350 stack at each location and only one location had this issue.

[Sysad]

Sounds good. Thanks again Philip. I greatly appreciate you taking the time to speak with me about the issue.