How to connect a shared printer (cups) to windows on another network?

Question

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There is a print server on cups. Shared printers are configured on it.
There are two networks: local 192.168.0.0 and VPN 10.8.0.0. There is full access between them.
You can access the cups server through a browser from any network and perform a test print.
Windows clients on the local network normally connect the shared cups printers by 631 and print, but from the VPN network they cannot connect the cups printers.

Chain FORWARD (policy DROP 0 packets, 0 bytes)
pkts bytes target prot opt ​​in out source destination
988K 127M ACCEPT all -- eth2 tun0 0.0.0.0/0 0.0.0.0/0
831K 241M ACCEPT all -- tun0 eth2 0.0.0.0/ 0 0.0.0.0/0
Chain POSTROUTING (policy ACCEPT 8462 packets, 576K bytes)
pkts bytes target prot opt ​​in out source destination
161K 10M MASQUERADE all -- * eth1 0.0.0.0/0 0.0.0.0/0