> Source: [sk109554](https://support.checkpoint.com/results/sk/sk109554)

# sk109554 - DHCP Offer is dropped in R77.20/R77.30 environment

| Property | Value |
|----------|-------|
| Solution ID | sk109554 |
| Date Created | 2016-01-11 |
| Last Modified | 2016-12-12 |
| Technical Level | Advanced |
| Products | Security Gateway, Security Management Server |
| Versions | R82.10, R82, R81.20, R82.10, R82, R81.20, R82.x, R82.20 |

## Symptoms

- * "`Reason: fwconn_key_init_links (INBOUND) failed;`" message on DHCP-traffic from DHCP-server drop.   

* Kernel debug shows:

  ```
  
  ;fwconn_lookup: conn (dir 0, server_IP:67 -> GW_IP:67 IPP 17);
  ;fwconn_lookup: not found in connections table;
  ????????? 
  ;fwconn_handle_field_in_values: operation = get, field = opaque, op_info = 9;
  ;fw_handle_first_packet: Rulebase returned ACCEPT;
  
  ;fw_handle_first_packet: match on rule (RULE_NUMBER);
  ????????? 
  fwconn_key_set_links_inbound: create link cls_
  .......................
  ;fwconn_key_set_link: failed to set the link (-3);
  ;fwconn_key_set_link: link collision ignored by SXL1;
  ;fw_handle_first_packet: fwconn_key_init_links failed. Dropping packet;
  ;fw_log_drop_ex: Packet proto=17  server_IP:67 -> GW_IP:67 dropped by fw_handle_first_packet Reason: fwconn_key_init_links (INBOUND) failed;
  ...................
  ;VM Final action=DROP;
  ```

## Cause

DHCP request is sent to Broadcast address and processed using the Legacy DHCP service "***dhcp-relay***" configured in Rulebase.

Returning traffic is matched to different rule that is located higher than the dhcp-relay rule in the rulebase. This rule may include gateway/cluster, dhcp-server objects and service with port 67 or "Any". This will create a collision in Firewall state tables when trying to create links for this connection.

## Solution

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