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remote printer connectivity problem

I have a printer attached to a workstation (USB port, printer sharing active) in one subnet, and a client in another subnet. The client is unable to access the printer. There is an 1841 router between them (directly connected to both subnets). The workstation with the printer generates CUPS subnet-broadcasts (192.168.0.15:UDP631) to advertise the printer availability, but of course the router is not forwarding these to the client subnet by default. The client is generating printer discovery-queries (224.0.0.251:UDP5353), again not forwarded by the router. (Placing the client in the same subnet allows access--so the problem is not the sharing function on the client or the printer-station.)

I supposed that putting the "IP helper-address <IP address of client>" command on the interface where the printer-station is, pointing to the client IP address, would solve this problem. It did not. Wireshark trace shows that the the CUPS advertisements are not being routed to the client subnet. Adding the command "IP forward-protocol udp 631" also did not solve the problem; the CUPS advertisements are still not being routed to the client subnet.

Further, adding the "IP helper-address <IP address of printer-station>" command on the interface where the client is, pointing to the printer-station, and adding the "IP forward-protocol udp 5353" global command, has not established connectivity between client and printer-station.

Wireshark traces show no ICMP destination unreachables or code 13s (ACL-access denied). Ping between client and printer-station goes through.

Ideas, suggestions, how to establish connectivity would be welcome.

 

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