> Source: [sk39529](https://support.checkpoint.com/results/sk/sk39529)

# sk39529 - BOOTP/DHCP Relay traffic is dropped although 'dhcp-rep-localmodule' and 'dhcp-req-localmodule' services are allowed in Rule Base

| Property | Value |
|----------|-------|
| Solution ID | sk39529 |
| Date Created | 2009-04-14 |
| Last Modified | 2018-03-26 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20 |

## Symptoms

- When Security Gateway is configured for DHCP Relay, DHCP traffic is dropped although '`dhcp-rep-localmodule`' and '`dhcp-req-localmodule`' services are allowed in the Security Rule Base.

## Cause

DHCP Relay traffic uses both a source UDP port 67 and destination UDP port 67.

The services '`dhcp-rep-localmodule`' and '`dhcp-req-localmodule`' expect traffic sent to UDP port 67 to arrive from UDP port 68, and vice versa. In addition, these services are intended for Security Gateway / Cluster itself.

DHCP traffic is dropped due to port mismatch.

This is expected behavior, by design.

## Solution

This solution requires authentication. Please log in to view the full solution.

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