> Source: [sk105645](https://support.checkpoint.com/results/sk/sk105645)

# sk105645 - Gratuitous ARP Requests are not sent upon cluster fail-over for IP addresses configured in the $FWDIR/conf/local.arp file, if those IP addresses and Cluster VIP address are on different subnets

| Property | Value |
|----------|-------|
| Solution ID | sk105645 |
| Date Created | 2015-04-10 |
| Last Modified | 2019-09-26 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20 |

## Symptoms

- * Gratuitous ARP Request packets (GARP) are not sent upon cluster fail-over for IP addresses configured in the *$FWDIR/conf/local.arp* file (per [sk30197](http://supportcontent.checkpoint.com/solutions?id=sk30197)), if those IP addresses and Cluster VIP address are on different subnets.

* *Example topology*:


  Internal Network --- \[Cluster\] --- External Network  

  * IP addresses of Internal Hosts that are advertized on External Network are 172.30.10.X/24
  * Cluster VIP address on External Network is 192.168.10.1/24

  Cluster debug ('`fw ctl debug -m cluster + if mac`') shows failures similar to the following:

  ```
  
  ;FW-1: fwha_send_gratuitous_arp: do send arp, ifn = 10, if_exists = 1, is_bond_slave = 0, fwha_cluster_cpips[i]=1.10.168.192, fwha_cluster_cpip_netmasks[i]=0.255.255.255, IF_ETHER(i)=00:50:56:AA:4B:07, IF_NETMASK(i)=0.255.255.255;
  ;fwha_send_gratuitous_arp: FWHA_SUBNET_BCAST(fwha_cluster_cpips[i], fwha_cluster_cpip_netmasks[i])=255.10.168.192;
  ;fwha_send_gratuitous_arp: FWHA_SUBNET_BCAST(_htonl(ip_addr), fwha_cluster_cpip_netmasks[i])=255.10.30.172;
  ;FW-1: fwha_send_gratuitous_arp: couldn't find a local interface for mac 00:50:56:AA:4B:07;
  ```

## Cause

By the current design, Gratuitous ARP Request packets (GARP) are sent only for IP addresses (configured in the *$FWDIR/conf/local.arp* file per [sk30197](http://supportcontent.checkpoint.com/solutions?id=sk30197)) from the same subnet as the Cluster VIP address.

## Solution

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