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DHCP client ignoring DHCP offers

TeleporterTeleporter Newbie ✭
in Entry Level Firewalls

Good evening,

I am having a strange issue where I have 16 SONOS Port that do not get a an address from the DHCP Server. The issue occurs if I connect the devices to the ISP modem and also if I connect them to a SonicWall TZ670. However the DHCP assignment process works fine if I connect the Sonos devices to an old TZ300.

On the packet capture from the firewall I can see how the DHCP process which is supposed to be Discover-Offer-Request-ACK is being repeated Dicover-Offer and the Sonos devices are ignoring the DHCP Offer and start over. Also many other devices work fine with DHCP on this network. We have done more than 100 installations with Sonos and Sonicwall and this is the first time that we have this issue.

The DHCP offer is being sent to the broadcast address 255.255.255.255 / ff:ff:ff:ff:ff:ff. I am mentioning this because there are DHCP servers that are sending unicast Responses and AFAIK broadcast is less problematic.

Category: Entry Level Firewalls
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