Regkey: [HKLM\SYSTEM\CurrentControlSet\Services\TransarcAFSDaemon\Parameters]
Type: DWORD
Default: 0
Variable: rx_mtu
If set to anything other than 0, that value is used as the maximum send and receive MTU supported by the RX interface.
In order to enable OpenAFS to operate across releases of the Cisco IPSec VPN client prior than 5.0, this value must be set to 1264 or smaller.