Request MAC adress of the default gateway in VLAN

[fabien.schom]

Hi,

I use Sophos AV feature that needs to send a broadcast on a specific port to communicate with a server.
"When a laptop icts rental exchange, the Sophos AutoUpdate component of Endpoint Security and Control installed on the laptop determined que la MAC address of the default gateway on the connected network Has Changed since the last update. It Then Sends an ICMP broadcast over the local Neighboring subnet to AutoUpdate installations, using UDP Port 51235 by default. "
On my Cisco switch (3750), I have a server VLAN (where the Sophos server) and a laptop VLAN (that need to connect to the server).
I created an Access the list in both directions on the Port 51235 (any host to the server on the port 51235) but it does not work (the requests do not pass).
Should the Laptop VLAN queries can find the MAC adress of the default gateway VLAN Server.
Do you think it's possible?

Thanks

[Bob Bagheri]

Hi Fabien, I'm trying to understand your question a bit more.  When a laptop looks for it's assigned IP default gateway's MAC address, it sends an ARP request to the local broadcast domain.  The traffic between the VLAN's must be routed, which can be achieved with SVI's (Switched VLAN Interfaces) on the 3750 itself.  With this in place you should be able to route between the two VLAN's without the need for any access lists.

Do you have Layer3 (routing /SVI's) configured on the switch?