according to t_relay() documentation: Returns a negative value on failure--you may still want to send a negative reply upstream statelessly not to leave upstream UAC in lurch. when t_relay cannot send request to the destination (no arp response), it seems to be generating on its own an error reply: 477 Unfortunately error sending to next hop occured this then results in two error replies (another one from script). is it true that the above error message is generated by t_relay()? if yes, is it somehow possible to get rid of it? in k tm module, there used to be a flag parameter to t_relay to control its error behavior. -- juha