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Bug #5198

closed

DHCP Relay Issue w/Unicast DHCP Requests

Added by Michael Willim over 9 years ago. Updated over 9 years ago.

Status:
Duplicate
Priority:
Normal
Assignee:
-
Category:
DHCP Relay
Target version:
-
Start date:
09/24/2015
Due date:
% Done:

0%

Estimated time:
Plus Target Version:
Release Notes:
Affected Version:
Affected Architecture:
i386

Description

We have multiple pfSense-Firewalls in a failover configuration on VMWare. We use CARP so we have configured VMWare accordingly ("Promiscuous Mode", "MAC Address changes", "Forged transmits").
We have a single DHCP server in a network that all the pfSense-Firewalls share. In order to provide DHCP for the other connected networks we use the DHCP relay functionality.

Description of symptoms:
1. DHCP requests are relayed to the shared network in which the DHCP server resides.
2. The relayed DHCP requests coming from the DHCP relay are Unicasts with source DHCP relay and destination DHCP server.
3. The other pfSense-Firewalls which are not the responsible DHCP relay do see the relayed DHCP requests.
4. The other pfSense-Firewalls process these relayed DHCP requests and relay them again. This behaviour causes duplicated relayed DHCP requests.

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